Mountain Weather

Inaccessible Pinnacle weather forecast.

986 m summit in Skye. 8 forecast days covering wind, cloud, rain and temperature, updated 22 September 2026 at 16:08 UTC.

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Confidence: Medium
Overall hill weather36/100Poor
Wind10-30 mph southwesterly Gusts30-40 mph Feels like0 to 4°C PrecipitationUp to around 2 mm Cloud-free summit estimate15% Cloud base through day600-900 m Freezing levelAbove summit DaylightSunrise 07:09 · Sunset 19:25 · 12.3 hours daylight

The day on the hill

Frequent summit cloud on Inaccessible Pinnacle: summit wind broadly 10-30 mph, with gusts 30-40 mph at times (strong winds). Hill cloud may make navigation difficult, with very poor visibility in wetter spells.

Wind & exposure

Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops.

Cloud & views

Cloud base mostly around 600–900 m through daylight. Summit cloud is likely, but brief clear spells remain possible if the cloud sits higher than expected.

Cloud-height uncertainty could put the summit in or out of cloud. Clear spells may be difficult to time.

Cloud may hang lower on southwestern slopes and lift somewhat on the northeastern side, but local terrain can differ. Very little direct sunshine is likely, with extensive cloud.

Drizzle is forecast for much of the day. The forecast total is up to around 2 mm, but local amounts will vary.

Forecast models differ on summit wind strength: around 23-28 mph at walker height, with gusts 32-39 mph.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Exposed tops may feel chilly in the wind.

A windproof layer will help, with an extra warm layer for stops. If clothing gets wet, you can cool more quickly.

Keep a dry warm layer protected. Buffeting may affect balance on exposed ground, particularly near ridges and edges.

Forecast models differ on whether meaningful rain reaches the hills during the morning.

Cloud-free timing: Around 10% early, improving to around 25% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 0 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Early
0 h
Midday
0 h
Later
0 h

Overnight forecast: 17:00–08:00 (UK local time), in Wild camping below.

Morning · 08:00–12:00 Poor Summit winds around 20-30 mph early in the morning, easing to 10-20 mph later. Gusts around 30-40 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges. Rain is forecast during this period. Rain is possible during the morning, but forecast models disagree on whether it will fall.
16/100
Afternoon · 12:00–17:00 Mixed Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground. Rain is forecast during this period.
57/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaCondensation risk is high near 300, 600 and 900 m. 64/100Mixed · 600 m View detailsHide details
Night beginning Tuesday 22 September 2026

Full overnight outlook

Open-hillside camping looks reasonable overall around 600 m (64/100). It may be breezy on open ground, with gusts near 25 mph. Peak gusts range from about 20 mph at 300 m to 25 mph at 900 m. Wind direction may change substantially during the night. Shelter that works at dusk may be less effective later. Little overnight rain is forecast. Pitches near 900 m may spend part of the night in cloud, bringing damp conditions and poor visibility while cloud is present. Condensation risk is high near 300, 600 and 900 m. Ventilation will matter. The coldest temperature falls from about 6.5°C at 300 m to 4.5°C at 900 m.

Overnight rain0.0 mm Open ground · 600 m10 mph · gusts 23 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc
86%
Moonrise
18:26 BST
Moonset
02:40 next morning BST

Extensive cloud may limit moonlight. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 22 Sep, 17:00 BST to 23 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m64/100 · reasonable
Wind / gust
9 mph / 19 mph
Typical / low
7.7°C / 6.5°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m64/100 · reasonable
Wind / gust
10 mph / 23 mph
Typical / low
7.7°C / 6.5°C · much of the night
In cloud
0% of modelled night
Condensation
High
900 m54/100 · mixed
Wind / gust
12 mph / 27 mph
Typical / low
5.8°C / 4.5°C · a brief spell
In cloud
67% of modelled night
Condensation
High

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 4°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Approximate height is enough, please do not share an exact wild-camp location.

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 35 mph may affect balance on exposed rock. Poor0/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (0/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Peridotite (North Britain Palaeogene Dyke Suite). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Representative samples along available mapped routes also include Olivine-gabbro, Basalt and microgabbro and 2 other mapped types, so rock character and wet-weather behaviour may change across the mountain. Gusts may reach about 35 mph. Crosswinds can make exposed ridges substantially more serious. Cloud may also make route-finding and retreat harder.

Rock surfaceWet rock likelyPeak gust36 mphRain1.1 mm
Main factorsgusts around 35 mphwet rock likelymuch of the route may be in cloud
Mapped rock across the summit and available routes Peridotite North Britain Palaeogene Dyke Suite
Origin
Igneous
Rock family
Granite, gneiss or gabbro
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Moderate confidence
View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point mapping plus representative BGS bedrock samples along available GPX routes. These are not continuous geological surveys; contacts, superficial deposits and the exposed rock on individual holds may differ.

Rock groups along the sampled routes

These are mapped rock groups, not separate weather forecasts or a ranking of route safety.

Inaccessible Pinnacle

granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

5 rock types appear across the available route samples

The summit type remains the forecast's cautious rock-response reference. Other mapped types show where conditions may behave differently elsewhere on the mountain.

Summit mapping Peridotite North Britain Palaeogene Dyke Suite Around 970 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Olivine-gabbro Outer Gabbros, A1 (Cuillin Centre) 252–492 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Basalt and microgabbro North Britain Palaeogene Dyke Suite 12–129 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Tholeiitic microgabbro Outer Bytownite Troctolites, B1 (Cuillin Centre) 609–726 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Bytownite troctolite Outer Bytownite Troctolites, B3 (Cuillin Centre) Around 851 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

A broad surface report is enough; you do not need to identify a particular route.

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

Recommended kit for this dayWeather-aware packing prompts, plus your core hillwalking kitView kit

For a day hillwalk, not a complete route-specific checklist. Carry navigation and backup you can use, warm and waterproof layers, suitable footwear, food and water, a headtorch, emergency shelter, first aid and a way to call for help. Snow, ice, technical terrain and overnight trips need additional equipment and skills.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

Help the Mountain Decisions Project understand how forecasts influence hill days, including when plans stay the same. Findings will be shared publicly as summaries, not individual responses.

This is about Inaccessible Pinnacle on Tuesday 22 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Confidence: Medium
Overall hill weather63/100Mixed
Wind10-25 mph northwesterly Gusts25-35 mph Feels like-4 to 0°C PrecipitationUp to around 2 mm Cloud-free summit estimate50% Cloud base through day800-1,300 m Freezing levelAbove summit DaylightSunrise 07:11 · Sunset 19:22 · 12.2 hours daylight

The day on the hill

On Inaccessible Pinnacle: summit wind broadly 10-25 mph, with gusts 25-35 mph at times (a fresh breeze).

Cloud & views

Cloud base around 800–1100 m in the morning, lifting to 1000–1300 m around midday. Summit cloud is extensive early, becoming less frequent later.

Cloud-height uncertainty could put the summit in or out of cloud. Clear spells may be difficult to time.

Sunny spells are possible away from summit cloud, but may not reach the top while it is in cloud.

Rain & temperature

Some rain is likely, totalling up to around 2 mm, but its timing and local amounts are uncertain. Cold on exposed tops: air temperature broadly 2 to 6°C, feeling around -4 to 0°C in the wind.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Keep windproof and warm layers readily available.

Forecast models differ on whether meaningful rain reaches the hills during the morning.

Cloud-free timing: Around 20% early, improving to around 55% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 9.6 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Early
1 h
Midday
4 h
Later
2.9 h

Overnight forecast: 17:00–08:00 (UK local time), in Wild camping below.

Morning · 08:00–12:00 Poor Summit winds around 10-25 mph. Gusts around 25-35 mph are possible on exposed ground. Rain is forecast during this period. Rain is possible during the morning, but forecast models disagree on whether it will fall.
46/100
Afternoon · 12:00–17:00 Good Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground. Rain is possible during the afternoon, but forecast models disagree on whether it will fall.
80/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaExposed camping is not recommended near 600 and 900 m: gusts may reach about 55 mph. Sustained winds may reach about 40 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. 19/100Poor · 600 m View detailsHide details
Night beginning Wednesday 23 September 2026

Full overnight outlook

Exposed camping is not recommended near 600 and 900 m: gusts may reach about 55 mph. Sustained winds may reach about 40 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. Open-hillside camping looks very poor overall around 600 m (19/100). Peak gusts range from about 35 mph at 300 m to 55 mph at 900 m. Wind direction may change substantially during the night. Shelter that works at dusk may be less effective later. Little overnight rain is forecast. Pitches near 900 m may spend part of the night in cloud, bringing damp conditions and poor visibility while cloud is present. The coldest temperature falls from about 6.4°C at 300 m to 4.4°C at 900 m.

Overnight rain0.2 mm Open ground · 600 m14 mph · gusts 45 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc
92%
Moonrise
18:33 BST
Moonset
04:06 next morning BST

Views of the Moon may come and go through cloud breaks. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 23 Sep, 17:00 BST to 24 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m39/100 · poor
Wind / gust
12 mph / 37 mph
Typical / low
6.8°C / 6.4°C · much of the night
In cloud
0% of modelled night
Condensation
Moderate
600 m19/100 · very poor
Wind / gust
14 mph / 45 mph
Typical / low
6.8°C / 6.3°C · much of the night
In cloud
20% of modelled night
Condensation
Moderate
900 m9/100 · very poor
Wind / gust
17 mph / 53 mph
Typical / low
4.7°C / 4.4°C · much of the night
In cloud
47% of modelled night
Condensation
Moderate

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 4°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Approximate height is enough, please do not share an exact wild-camp location.

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Poor28/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look poor (28/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Peridotite (North Britain Palaeogene Dyke Suite). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Representative samples along available mapped routes also include Olivine-gabbro, Basalt and microgabbro and 2 other mapped types, so rock character and wet-weather behaviour may change across the mountain.

Rock surfaceWet rock likelyPeak gust28 mphRain0.4 mm
Main concernwet rock likely
Mapped rock across the summit and available routes Peridotite North Britain Palaeogene Dyke Suite
Origin
Igneous
Rock family
Granite, gneiss or gabbro
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Moderate confidence
View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point mapping plus representative BGS bedrock samples along available GPX routes. These are not continuous geological surveys; contacts, superficial deposits and the exposed rock on individual holds may differ.

Rock groups along the sampled routes

These are mapped rock groups, not separate weather forecasts or a ranking of route safety.

Inaccessible Pinnacle

granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

5 rock types appear across the available route samples

The summit type remains the forecast's cautious rock-response reference. Other mapped types show where conditions may behave differently elsewhere on the mountain.

Summit mapping Peridotite North Britain Palaeogene Dyke Suite Around 970 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Olivine-gabbro Outer Gabbros, A1 (Cuillin Centre) 252–492 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Basalt and microgabbro North Britain Palaeogene Dyke Suite 12–129 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Tholeiitic microgabbro Outer Bytownite Troctolites, B1 (Cuillin Centre) 609–726 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Bytownite troctolite Outer Bytownite Troctolites, B3 (Cuillin Centre) Around 851 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

A broad surface report is enough; you do not need to identify a particular route.

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

Recommended kit for this dayWeather-aware packing prompts, plus your core hillwalking kitView kit

For a day hillwalk, not a complete route-specific checklist. Carry navigation and backup you can use, warm and waterproof layers, suitable footwear, food and water, a headtorch, emergency shelter, first aid and a way to call for help. Snow, ice, technical terrain and overnight trips need additional equipment and skills.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

Help the Mountain Decisions Project understand how forecasts influence hill days, including when plans stay the same. Findings will be shared publicly as summaries, not individual responses.

This is about Inaccessible Pinnacle on Wednesday 23 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Confidence: Medium
Overall hill weather0/100Severe hill conditions
Wind35-50 mph southerly Gusts60-70 mph Feels like-4 to 0°C PrecipitationAround 10-20 mm Cloud-free summit estimate15% Cloud base through day500-800 m Freezing levelAbove summit DaylightSunrise 07:13 · Sunset 19:19 · 12.1 hours daylight

The day on the hill

Strong gusts and frequent summit cloud on Inaccessible Pinnacle: summit wind broadly 35-50 mph, with gusts 60-70 mph at times (gale-force mean winds at times). Visibility may drop briefly in showers.

Things to watch

High spate risk through the day and overnight, with forecast rain and subsequent runoff. Risk may continue beyond the daytime period shown. Timings are approximate, not a guarantee of safe crossings afterwards. Burns and unbridged crossings may become difficult or impassable. Turn back if a crossing looks unsafe.

Wind & exposure

Much calmer lower down - generally 20-30 mph in the valley, rising towards the tops.

Cloud & views

Cloud base mostly around 500–800 m through daylight. Cloud is likely to cover the top for most or all of daylight, with no dependable break.

Cloud may hang lower on southern slopes and lift somewhat on the northern side, but local terrain can differ. Very little direct sunshine is likely, with extensive cloud.

Rain & temperature

Rain and drizzle are forecast for much of the day, with some passing showers too. The forecast total is around 10-20 mm, but local amounts will vary.

Cold on exposed tops: air temperature broadly 2 to 6°C, feeling around -4 to 0°C in the wind. Forecast models differ on summit wind strength: around 43-53 mph at walker height, with gusts 60-74 mph.

Keep windproof and warm layers readily available. If clothing gets wet, you can cool more quickly.

Keep a dry warm layer protected. The strongest gusts could knock you over on exposed ground.

Avoid exposed ridges and edges.

Forecast confidence

Rain timing may shift by several hours, which could change how much of the main walking period stays dry.

0 is the bottom of the scale. Use the hazard details to judge how severe conditions could be.

Cloud-free timing: Best around midday at about 30%, compared with around 10% early and 5% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 0 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Early
0 h
Midday
0 h
Later
0 h

Overnight forecast: 17:00–08:00 (UK local time), in Wild camping below.

Morning · 08:00–12:00 Poor Summit winds around 30-40 mph. Gusts around 50-60 mph are possible on exposed ground. Gusts may knock you off balance on exposed ground, even between spells of lighter wind. Rain is forecast during this period. Rain is possible during the morning, but forecast models disagree on whether it will fall.
8/100
Afternoon · 12:00–17:00 Severe hill conditions More rain is expected. Summit winds around 35-50 mph. Gusts around 60-70 mph are possible on exposed ground. The strongest gusts could knock you over on exposed ground. Avoid exposed ridges and edges. Rain is forecast during this period. Rain is forecast during the afternoon, but models differ considerably on the amount.
0/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaExposed camping is not recommended near 300, 600 and 900 m: gusts may reach about 70 mph. Sustained winds may reach about 50 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. 9/100Poor · 600 m View detailsHide details
Night beginning Thursday 24 September 2026

Full overnight outlook

Exposed camping is not recommended near 300, 600 and 900 m: gusts may reach about 70 mph. Sustained winds may reach about 50 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. Open-hillside camping looks very poor overall around 600 m (9/100). Peak gusts range from about 50 mph at 300 m to 70 mph at 900 m. Roughly 10.7 mm is forecast overnight, including rain around pitching time. Pitches near 600 and 900 m may spend part of the night in cloud, bringing damp conditions and poor visibility while cloud is present. Condensation risk is high near 300, 600 and 900 m. Ventilation will matter. The coldest temperature falls from about 8.5°C at 300 m to 6.1°C at 900 m.

Overnight rain10.7 mm Open ground · 600 m32 mph · gusts 58 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc
97%
Moonrise
18:38 BST
Moonset
05:31 next morning BST

Extensive cloud may limit moonlight. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 24 Sep, 17:00 BST to 25 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m19/100 · very poor
Wind / gust
26 mph / 48 mph
Typical / low
8.9°C / 8.5°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m9/100 · very poor
Wind / gust
32 mph / 58 mph
Typical / low
8.1°C / 7.7°C · much of the night
In cloud
47% of modelled night
Condensation
High
900 m0/100 · very poor
Wind / gust
37 mph / 68 mph
Typical / low
6.7°C / 6.1°C · much of the night
In cloud
53% of modelled night
Condensation
High

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 4°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Approximate height is enough, please do not share an exact wild-camp location.

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 65 mph may affect balance on exposed rock. Poor0/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (0/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Peridotite (North Britain Palaeogene Dyke Suite). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Representative samples along available mapped routes also include Olivine-gabbro, Basalt and microgabbro and 2 other mapped types, so rock character and wet-weather behaviour may change across the mountain. Gusts may reach about 65 mph. Crosswinds can make exposed ridges substantially more serious. Cloud may also make route-finding and retreat harder.

Rock surfaceWet rock likelyPeak gust65 mphRain13.2 mm
Main factorsgusts around 65 mphwet rock likelymuch of the route may be in cloud
Mapped rock across the summit and available routes Peridotite North Britain Palaeogene Dyke Suite
Origin
Igneous
Rock family
Granite, gneiss or gabbro
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Moderate confidence
View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point mapping plus representative BGS bedrock samples along available GPX routes. These are not continuous geological surveys; contacts, superficial deposits and the exposed rock on individual holds may differ.

Rock groups along the sampled routes

These are mapped rock groups, not separate weather forecasts or a ranking of route safety.

Inaccessible Pinnacle

granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

5 rock types appear across the available route samples

The summit type remains the forecast's cautious rock-response reference. Other mapped types show where conditions may behave differently elsewhere on the mountain.

Summit mapping Peridotite North Britain Palaeogene Dyke Suite Around 970 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Olivine-gabbro Outer Gabbros, A1 (Cuillin Centre) 252–492 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Basalt and microgabbro North Britain Palaeogene Dyke Suite 12–129 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Tholeiitic microgabbro Outer Bytownite Troctolites, B1 (Cuillin Centre) 609–726 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Bytownite troctolite Outer Bytownite Troctolites, B3 (Cuillin Centre) Around 851 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

A broad surface report is enough; you do not need to identify a particular route.

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

Recommended kit for this dayWeather-aware packing prompts, plus your core hillwalking kitView kit

For a day hillwalk, not a complete route-specific checklist. Carry navigation and backup you can use, warm and waterproof layers, suitable footwear, food and water, a headtorch, emergency shelter, first aid and a way to call for help. Snow, ice, technical terrain and overnight trips need additional equipment and skills.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

Help the Mountain Decisions Project understand how forecasts influence hill days, including when plans stay the same. Findings will be shared publicly as summaries, not individual responses.

This is about Inaccessible Pinnacle on Thursday 24 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

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Confidence: Medium
Overall hill weather0/100Severe hill conditions
Wind25-35 mph southwesterly Gusts40-50 mph Feels like-4 to 0°C PrecipitationAround 5-10 mm Cloud-free summit estimate10% Cloud base through day500-1,000 m Freezing levelAbove summit DaylightSunrise 07:15 · Sunset 19:16 · 12.0 hours daylight

The day on the hill

A wet day with extensive summit cloud on Inaccessible Pinnacle: summit wind broadly 25-35 mph, with gusts 40-50 mph at times (strong winds).

Things to watch

Thunderstorms are possible from the morning into the evening. Avoid committing to exposed ridges if storms begin to build.

If a thunderstorm develops, sudden gusts and heavy rain can change conditions quickly. Visibility may drop briefly in showers.

Wind & exposure

Much calmer lower down - generally 15-25 mph in the valley, rising towards the tops.

Cloud & views

Cloud base around 700–1000 m in the morning, lowering to 500–800 m around midday. Summit cloud is likely, but brief clear spells remain possible if the cloud sits higher than expected.

Cloud-height uncertainty could put the summit in or out of cloud. Clear spells may be difficult to time.

Cloud may hang lower on southwestern slopes and lift somewhat on the northeastern side, but local terrain can differ. Any sunshine may be confined to lower ground or breaks away from the summit.

Drizzle is forecast for much of the day, with some passing showers too. The forecast total is around 5-10 mm, but local amounts will vary.

Cold on exposed tops: air temperature broadly 2 to 6°C, feeling around -4 to 0°C in the wind. Forecast models differ on summit wind strength: around 27-36 mph at walker height, with gusts 38-51 mph.

Rain & temperature

The ground is likely to be wet after recent rain.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Keep windproof and warm layers readily available.

If clothing gets wet, you can cool more quickly. Keep a dry warm layer protected.

Buffeting may affect balance on exposed ground, particularly near ridges and edges. Thunderstorm timing is inherently uncertain and may shift by several hours.

0 is the bottom of the scale. Use the hazard details to judge how severe conditions could be.

Cloud-free timing: Around 20% early, falling to around 5% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 10.3 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Cloud may obscure this summit even while the surrounding model grid indicates sunshine. The low cloud-free summit estimate is a reason to be cautious about expecting views.

Early
2 h
Midday
4 h
Later
2.7 h

Overnight forecast: 17:00–08:00 (UK local time), in Wild camping below.

Morning · 08:00–12:00 Poor Summit winds around 25-35 mph. Gusts around 40-50 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges. Rain is forecast during this period.
3/100
Afternoon · 12:00–17:00 Severe hill conditions More rain is expected. Summit winds around 25-35 mph. Gusts around 35-45 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges. Rain is forecast during this period. Rain is possible during the afternoon, but forecast models disagree on whether it will fall.
0/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaExposed camping is not recommended near 900 m: gusts may reach about 45 mph. Sustained winds may reach about 30 mph at times. Lower sheltered ground may be less exposed, but this forecast does not confirm a suitable pitch or a safe approach. Check its overnight conditions separately. Moderate thunderstorm risk. 14/100Poor · 600 m View detailsHide details
Night beginning Friday 25 September 2026

Full overnight outlook

Exposed camping is not recommended near 900 m: gusts may reach about 45 mph. Sustained winds may reach about 30 mph at times. Lower sheltered ground may be less exposed, but this forecast does not confirm a suitable pitch or a safe approach. Check its overnight conditions separately. Open-hillside camping looks very poor overall around 600 m (14/100). Peak gusts range from about 30 mph at 300 m to 45 mph at 900 m. Roughly 9.1 mm is forecast overnight, with rain liable to affect both pitching and packing up. Pitches near 600 and 900 m may spend part of the night in cloud, bringing damp conditions and poor visibility while cloud is present. Condensation risk is high near 600 and 900 m. Ventilation will matter. The coldest temperature falls from about 7.2°C at 300 m to 4.4°C at 900 m. Moderate thunderstorm risk, broadly from late afternoon into the evening. Avoid exposed ridges and summits and be prepared to descend.

Overnight rain9.1 mm Open ground · 600 m23 mph · gusts 38 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Near-full moon

Illuminated disc
99%
Moonrise
18:42 BST
Moonset
06:58 next morning BST

Views of the Moon may come and go through cloud breaks. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 25 Sep, 17:00 BST to 26 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m34/100 · poor
Wind / gust
19 mph / 31 mph
Typical / low
7.5°C / 7.2°C · much of the night
In cloud
0% of modelled night
Condensation
Moderate
600 m14/100 · very poor
Wind / gust
23 mph / 38 mph
Typical / low
6.9°C / 6.5°C · much of the night
In cloud
53% of modelled night
Condensation
High
900 m0/100 · very poor
Wind / gust
27 mph / 44 mph
Typical / low
5.0°C / 4.4°C · much of the night
In cloud
67% of modelled night
Condensation
High

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 4°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Approximate height is enough, please do not share an exact wild-camp location.

Daytime · exposed rockClimbing & scramblingBetaModerate thunderstorm risk. Avoid exposed rock if storms develop. Wet rock is likely. Gusts near 45 mph may affect balance on exposed rock. Poor0/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (0/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Peridotite (North Britain Palaeogene Dyke Suite). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Representative samples along available mapped routes also include Olivine-gabbro, Basalt and microgabbro and 2 other mapped types, so rock character and wet-weather behaviour may change across the mountain. Gusts may reach about 45 mph. Crosswinds can make exposed ridges substantially more serious. Cloud may also make route-finding and retreat harder. Moderate thunderstorm risk, broadly from the morning into the evening. Avoid committing to exposed ground if storms develop.

Rock surfaceWet rock likelyPeak gust45 mphRain8.1 mm
Main factorsmoderate thunderstorm risk on exposed groundgusts around 45 mphwet rock likely
Mapped rock across the summit and available routes Peridotite North Britain Palaeogene Dyke Suite
Origin
Igneous
Rock family
Granite, gneiss or gabbro
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Moderate confidence
View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point mapping plus representative BGS bedrock samples along available GPX routes. These are not continuous geological surveys; contacts, superficial deposits and the exposed rock on individual holds may differ.

Rock groups along the sampled routes

These are mapped rock groups, not separate weather forecasts or a ranking of route safety.

Inaccessible Pinnacle

granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

5 rock types appear across the available route samples

The summit type remains the forecast's cautious rock-response reference. Other mapped types show where conditions may behave differently elsewhere on the mountain.

Summit mapping Peridotite North Britain Palaeogene Dyke Suite Around 970 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Olivine-gabbro Outer Gabbros, A1 (Cuillin Centre) 252–492 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Basalt and microgabbro North Britain Palaeogene Dyke Suite 12–129 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Tholeiitic microgabbro Outer Bytownite Troctolites, B1 (Cuillin Centre) 609–726 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Bytownite troctolite Outer Bytownite Troctolites, B3 (Cuillin Centre) Around 851 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

A broad surface report is enough; you do not need to identify a particular route.

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

Recommended kit for this dayWeather-aware packing prompts, plus your core hillwalking kitView kit

For a day hillwalk, not a complete route-specific checklist. Carry navigation and backup you can use, warm and waterproof layers, suitable footwear, food and water, a headtorch, emergency shelter, first aid and a way to call for help. Snow, ice, technical terrain and overnight trips need additional equipment and skills.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

Help the Mountain Decisions Project understand how forecasts influence hill days, including when plans stay the same. Findings will be shared publicly as summaries, not individual responses.

This is about Inaccessible Pinnacle on Friday 25 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Confidence: Medium
Overall hill weather0/100Severe hill conditions
Wind30-50 mph southwesterly Gusts60-70 mph Feels like-4 to 0°C PrecipitationAround 20-40 mm Cloud-free summit estimate5% Cloud base through day400-700 m Freezing levelAbove summit DaylightSunrise 07:17 · Sunset 19:14 · 11.9 hours daylight

The day on the hill

Strong gusts and frequent summit cloud on Inaccessible Pinnacle: summit wind broadly 30-50 mph, with gusts 60-70 mph at times (gale-force mean winds at times).

Things to watch

Thunderstorms are forecast from late afternoon into the evening. Avoid exposed summits and ridges during the risk period.

Heavier showers may bring brief, stronger gusts and rapidly reduced visibility. High spate risk from the afternoon into the night, with forecast rain and subsequent runoff. Risk may continue beyond the daytime period shown. Timings are approximate, not a guarantee of safe crossings afterwards. Burns and unbridged crossings may become difficult or impassable. Turn back if a crossing looks unsafe.

Wind & exposure

Much calmer lower down - generally 20-30 mph in the valley, rising towards the tops.

Cloud & views

Cloud base mostly around 400–700 m through daylight. Cloud is likely to cover the top for most or all of daylight, with no dependable break.

Cloud may hang lower on southwestern slopes and lift somewhat on the northeastern side, but local terrain can differ. Any sunshine may be confined to lower ground or breaks away from the summit.

Drizzle is forecast for much of the day, with some passing showers too. Some showers could be heavy.

The forecast total is around 20-40 mm, but local amounts will vary. Cold on exposed tops: air temperature broadly 2 to 6°C, feeling around -4 to 0°C in the wind.

Forecast models differ on summit wind strength: around 35-52 mph at walker height, with gusts 49-72 mph.

Rain & temperature

The ground is likely to be wet after recent rain.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Keep windproof and warm layers readily available.

If clothing gets wet, you can cool more quickly. Keep a dry warm layer protected.

The strongest gusts could knock you over on exposed ground. Avoid exposed ridges and edges.

Thunderstorm timing is inherently uncertain and may shift by several hours.

0 is the bottom of the scale. Use the hazard details to judge how severe conditions could be.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 7.9 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Cloud may obscure this summit even while the surrounding model grid indicates sunshine. The low cloud-free summit estimate is a reason to be cautious about expecting views.

Early
2 h
Midday
2.9 h
Later
1.5 h

Overnight forecast: 17:00–08:00 (UK local time), in Wild camping below.

Morning · 08:00–12:00 Poor Summit winds around 25-40 mph. Gusts around 45-55 mph are possible on exposed ground. Gusts may knock you off balance on exposed ground, even between spells of lighter wind. Rain is forecast during this period. Rain is possible during the morning, but forecast models disagree on whether it will fall.
6/100
Afternoon · 12:00–17:00 Severe hill conditions Winds strengthen compared with the morning. More rain is expected. Summit winds around 35-45 mph. Gusts around 60-70 mph are possible on exposed ground. The strongest gusts could knock you over on exposed ground. Avoid exposed ridges and edges. Rain is forecast during this period. Rain is forecast during the afternoon, but models differ considerably on the amount.
0/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaExposed camping is not recommended near 300, 600 and 900 m: gusts may reach about 60 mph. Sustained winds may reach about 45 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. High thunderstorm risk. 0/100Poor · 600 m View detailsHide details
Night beginning Saturday 26 September 2026

Full overnight outlook

Exposed camping is not recommended near 300, 600 and 900 m: gusts may reach about 60 mph. Sustained winds may reach about 45 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. Open-hillside camping looks very poor overall around 600 m (0/100). Peak gusts range from about 45 mph at 300 m to 60 mph at 900 m. Roughly 18 mm is forecast overnight, with rain liable to affect both pitching and packing up. Pitches near 600 and 900 m may spend part of the night in cloud, bringing damp conditions and poor visibility while cloud is present. Condensation risk is high near 300, 600 and 900 m. Ventilation will matter. The coldest temperature falls from about 9°C at 300 m to 6.2°C at 900 m. High thunderstorm risk, broadly from late afternoon into the evening. Avoid exposed ridges and summits and be prepared to descend.

Overnight rain18.0 mm Open ground · 600 m28 mph · gusts 51 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Near-full moon

Illuminated disc
100%
Moonrise
18:47 BST
Moonset
Outside this window

Cloud at the reference camping height may hide the Moon. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 26 Sep, 17:00 BST to 27 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m0/100 · very poor
Wind / gust
24 mph / 43 mph
Typical / low
9.3°C / 9.0°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m0/100 · very poor
Wind / gust
28 mph / 51 mph
Typical / low
8.2°C / 7.7°C · much of the night
In cloud
100% of modelled night
Condensation
High
900 m0/100 · very poor
Wind / gust
34 mph / 60 mph
Typical / low
6.4°C / 6.2°C · much of the night
In cloud
100% of modelled night
Condensation
High

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 4°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Approximate height is enough, please do not share an exact wild-camp location.

Daytime · exposed rockClimbing & scramblingBetaHigh thunderstorm risk. Avoid exposed rock if storms develop. Wet rock is likely. Gusts near 60 mph may affect balance on exposed rock. Poor0/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (0/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Peridotite (North Britain Palaeogene Dyke Suite). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Representative samples along available mapped routes also include Olivine-gabbro, Basalt and microgabbro and 2 other mapped types, so rock character and wet-weather behaviour may change across the mountain. Gusts may reach about 60 mph. Crosswinds can make exposed ridges substantially more serious. Cloud may also make route-finding and retreat harder. High thunderstorm risk, broadly from late afternoon into the evening. Avoid committing to exposed ground if storms develop.

Rock surfaceWet rock likelyPeak gust62 mphRain19.3 mm
Main factorshigh thunderstorm risk on exposed groundgusts around 60 mphwet rock likely
Mapped rock across the summit and available routes Peridotite North Britain Palaeogene Dyke Suite
Origin
Igneous
Rock family
Granite, gneiss or gabbro
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Moderate confidence
View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point mapping plus representative BGS bedrock samples along available GPX routes. These are not continuous geological surveys; contacts, superficial deposits and the exposed rock on individual holds may differ.

Rock groups along the sampled routes

These are mapped rock groups, not separate weather forecasts or a ranking of route safety.

Inaccessible Pinnacle

granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

5 rock types appear across the available route samples

The summit type remains the forecast's cautious rock-response reference. Other mapped types show where conditions may behave differently elsewhere on the mountain.

Summit mapping Peridotite North Britain Palaeogene Dyke Suite Around 970 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Olivine-gabbro Outer Gabbros, A1 (Cuillin Centre) 252–492 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Basalt and microgabbro North Britain Palaeogene Dyke Suite 12–129 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Tholeiitic microgabbro Outer Bytownite Troctolites, B1 (Cuillin Centre) 609–726 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Bytownite troctolite Outer Bytownite Troctolites, B3 (Cuillin Centre) Around 851 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

A broad surface report is enough; you do not need to identify a particular route.

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

Recommended kit for this dayWeather-aware packing prompts, plus your core hillwalking kitView kit

For a day hillwalk, not a complete route-specific checklist. Carry navigation and backup you can use, warm and waterproof layers, suitable footwear, food and water, a headtorch, emergency shelter, first aid and a way to call for help. Snow, ice, technical terrain and overnight trips need additional equipment and skills.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

Help the Mountain Decisions Project understand how forecasts influence hill days, including when plans stay the same. Findings will be shared publicly as summaries, not individual responses.

This is about Inaccessible Pinnacle on Saturday 26 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Confidence: Medium
Overall hill weather5/100Poor
Wind20-35 mph southwesterly Gusts35-45 mph Feels like-4 to 0°C PrecipitationUp to around 2 mm Cloud-free summit estimate35% Cloud base through day400-1,600 m Freezing levelAbove summit DaylightSunrise 07:19 · Sunset 19:11 · 11.9 hours daylight

The day on the hill

Frequent summit cloud on Inaccessible Pinnacle: summit wind broadly 20-35 mph, with gusts 35-45 mph at times (strong winds).

Things to watch

Thunderstorms are possible from early morning into the evening. Avoid committing to exposed ridges if storms begin to build.

If a thunderstorm develops, sudden gusts and heavy rain can change conditions quickly. Possible spate risk during the morning, with recent and forecast rain and subsequent runoff. Timings are approximate, not a guarantee of safe crossings afterwards. Burns and unbridged crossings may rise quickly. Turn back if a crossing looks unsafe.

Wind & exposure

Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops.

Cloud & views

Cloud base around 400–700 m in the morning, lifting to 600–900 m around midday and 1300–1600 m by late afternoon. The top is likely to drift in and out of cloud, with the best chance of a view from late afternoon into the evening.

Cloud-height uncertainty could put the summit in or out of cloud. Clear spells may be difficult to time.

Sunny spells are possible away from summit cloud, but may not reach the top while it is in cloud. Drizzle is forecast at times.

The forecast total is up to around 2 mm, but local amounts will vary. Cold on exposed tops: air temperature broadly 2 to 6°C, feeling around -4 to 0°C in the wind.

Forecast models differ on summit wind strength: around 23-34 mph at walker height, with gusts 33-47 mph.

Rain & temperature

The ground is likely to be saturated after recent rain. Expect boggy paths and rapid runoff if more rain arrives.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Keep windproof and warm layers readily available.

Buffeting may affect balance on exposed ground, particularly near ridges and edges. Thunderstorm timing is inherently uncertain and may shift by several hours.

Cloud-free timing: Around 5% early, improving to around 80% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 10 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Cloud may obscure this summit even while the surrounding model grid indicates sunshine. The low cloud-free summit estimate is a reason to be cautious about expecting views.

Early
1 h
Midday
4 h
Later
3 h

Overnight forecast: 17:00–08:00 (UK local time), in Wild camping below.

Morning · 08:00–12:00 Poor Summit winds around 25-35 mph. Gusts around 35-45 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges. Rain is forecast during this period. Some forecast models bring rain during the morning, while others keep it mostly dry.
0/100
Afternoon · 12:00–17:00 Poor Summit winds around 25-35 mph in the early afternoon, easing to 15-25 mph later. Gusts around 35-45 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges. Some forecast models bring rain during the afternoon, while others keep it mostly dry.
10/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaLow thunderstorm risk. Avoid an exposed pitch if storms develop. 43/100Poor · 600 m View detailsHide details
Night beginning Sunday 27 September 2026

Full overnight outlook

Open-hillside camping looks mixed overall around 600 m (43/100). A lower pitch near 300 m looks more comfortable. Conditions are less suitable by 900 m. Open-ground gusts may reach about 35 mph. Seek meaningful shelter. Peak gusts range from about 25 mph at 300 m to 35 mph at 900 m. Around 1 mm is forecast, including rain around pack-up. Pitches near 900 m may spend part of the night in cloud, bringing damp conditions and poor visibility while cloud is present. The coldest temperature falls from about 7.2°C at 300 m to 4.2°C at 900 m. Low thunderstorm risk, broadly from late afternoon into the evening. Avoid exposed ridges and summits and be prepared to descend.

Overnight rain1.0 mm Open ground · 600 m18 mph · gusts 30 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waning gibbous moon

Illuminated disc
98%
Moonrise
18:52 BST
Moonset
Outside this window

Views of the Moon may come and go through cloud breaks. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 27 Sep, 17:00 BST to 28 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m66/100 · reasonable
Wind / gust
15 mph / 25 mph
Typical / low
7.5°C / 7.2°C · much of the night
In cloud
0% of modelled night
Condensation
Low
600 m43/100 · mixed
Wind / gust
18 mph / 30 mph
Typical / low
6.4°C / 6.3°C · much of the night
In cloud
20% of modelled night
Condensation
Low
900 m23/100 · poor
Wind / gust
22 mph / 35 mph
Typical / low
4.7°C / 4.2°C · much of the night
In cloud
27% of modelled night
Condensation
Low

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 4°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

The ground is likely to be very wet after recent rain. Expect boggy approaches and choose a durable pitch carefully.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Approximate height is enough, please do not share an exact wild-camp location.

Daytime · exposed rockClimbing & scramblingBetaModerate thunderstorm risk. Avoid exposed rock if storms develop. Wet rock is likely. Gusts near 40 mph may affect balance on exposed rock. Poor0/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (0/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Peridotite (North Britain Palaeogene Dyke Suite). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Representative samples along available mapped routes also include Olivine-gabbro, Basalt and microgabbro and 2 other mapped types, so rock character and wet-weather behaviour may change across the mountain. Gusts may reach about 40 mph. Crosswinds can make exposed ridges substantially more serious. Cloud may also make route-finding and retreat harder. Moderate thunderstorm risk, broadly from early morning into the evening. Avoid committing to exposed ground if storms develop.

Rock surfaceWet rock likelyPeak gust40 mphRain0.3 mm
Main factorsmoderate thunderstorm risk on exposed groundgusts around 40 mphwet rock likely
Mapped rock across the summit and available routes Peridotite North Britain Palaeogene Dyke Suite
Origin
Igneous
Rock family
Granite, gneiss or gabbro
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Moderate confidence
View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point mapping plus representative BGS bedrock samples along available GPX routes. These are not continuous geological surveys; contacts, superficial deposits and the exposed rock on individual holds may differ.

Rock groups along the sampled routes

These are mapped rock groups, not separate weather forecasts or a ranking of route safety.

Inaccessible Pinnacle

granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

5 rock types appear across the available route samples

The summit type remains the forecast's cautious rock-response reference. Other mapped types show where conditions may behave differently elsewhere on the mountain.

Summit mapping Peridotite North Britain Palaeogene Dyke Suite Around 970 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Olivine-gabbro Outer Gabbros, A1 (Cuillin Centre) 252–492 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Basalt and microgabbro North Britain Palaeogene Dyke Suite 12–129 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Tholeiitic microgabbro Outer Bytownite Troctolites, B1 (Cuillin Centre) 609–726 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Bytownite troctolite Outer Bytownite Troctolites, B3 (Cuillin Centre) Around 851 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

A broad surface report is enough; you do not need to identify a particular route.

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

Recommended kit for this dayWeather-aware packing prompts, plus your core hillwalking kitView kit

For a day hillwalk, not a complete route-specific checklist. Carry navigation and backup you can use, warm and waterproof layers, suitable footwear, food and water, a headtorch, emergency shelter, first aid and a way to call for help. Snow, ice, technical terrain and overnight trips need additional equipment and skills.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

Help the Mountain Decisions Project understand how forecasts influence hill days, including when plans stay the same. Findings will be shared publicly as summaries, not individual responses.

This is about Inaccessible Pinnacle on Sunday 27 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Confidence: Unavailable
Overall hill weather39/100Poor
Wind15-25 mph southerly Gusts25-35 mph Feels like-4 to 0°C PrecipitationUp to around 2 mm Cloud-free summit estimate45% Cloud base through day400-1,600 m Freezing levelAbove summit DaylightSunrise 07:21 · Sunset 19:08 · 11.8 hours daylight

The day on the hill

Frequent summit cloud on Inaccessible Pinnacle: summit wind broadly 15-25 mph, with gusts 25-35 mph at times (a fresh breeze).

Cloud & views

Cloud base around 400–700 m in the morning, lifting to 700–1000 m around midday and 1300–1600 m by late afternoon. The top is likely to drift in and out of cloud, with the best chance of a view from late afternoon into the evening.

Cloud-height uncertainty could put the summit in or out of cloud. Clear spells may be difficult to time.

Cloud may hang lower on southern slopes and lift somewhat on the northern side, but local terrain can differ. Sunny spells are possible away from summit cloud, but may not reach the top while it is in cloud.

Drizzle is forecast at times. The forecast total is up to around 2 mm, but local amounts will vary.

Cold on exposed tops: air temperature broadly 2 to 6°C, feeling around -4 to 0°C in the wind. Forecast models differ on summit wind strength.

Treat the wind figures as a guide. Keep windproof and warm layers readily available.

Rain & temperature

The ground is likely to be wet after recent rain.

Forecast confidence

Overall confidence is unavailable: insufficient comparable wind, rain guidance.

Cloud-free timing: Around 5% early, improving to around 95% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 9.1 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Cloud may obscure this summit even while the surrounding model grid indicates sunshine. The low cloud-free summit estimate is a reason to be cautious about expecting views.

Early
2 h
Midday
4 h
Later
1.4 h

Overnight forecast: 17:00–08:00 (UK local time), in Wild camping below.

Morning · 08:00–12:00 Poor Summit winds around 15-25 mph. Gusts around 25-35 mph are possible on exposed ground. Rain is forecast during this period.
32/100
Afternoon · 12:00–17:00 Poor Summit winds around 15-25 mph. Gusts around 25-35 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later. Some forecast models bring rain during the afternoon, while others keep it mostly dry.
46/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaExposed camping is not recommended near 300, 600 and 900 m: gusts may reach about 60 mph. Sustained winds may reach about 45 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. 9/100Poor · 600 m View detailsHide details
Night beginning Monday 28 September 2026

Full overnight outlook

Exposed camping is not recommended near 300, 600 and 900 m: gusts may reach about 60 mph. Sustained winds may reach about 45 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. Open-hillside camping looks very poor overall around 600 m (9/100). Peak gusts range from about 45 mph at 300 m to 60 mph at 900 m. Around 1 mm is forecast, including rain around pack-up. Some condensation is possible overnight. The coldest temperature falls from about 7.1°C at 300 m to 3.4°C at 900 m.

Overnight rain1.0 mm Open ground · 600 m18 mph · gusts 51 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waning gibbous moon

Illuminated disc
94%
Moonrise
18:59 BST
Moonset
Outside this window

Extensive cloud may limit moonlight. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 28 Sep, 17:00 BST to 29 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m19/100 · very poor
Wind / gust
15 mph / 43 mph
Typical / low
9.3°C / 7.1°C · much of the night
In cloud
0% of modelled night
Condensation
Low
600 m9/100 · very poor
Wind / gust
18 mph / 51 mph
Typical / low
8.4°C / 7.1°C · much of the night
In cloud
0% of modelled night
Condensation
Low
900 m9/100 · very poor
Wind / gust
21 mph / 60 mph
Typical / low
4.4°C / 3.4°C · much of the night
In cloud
13% of modelled night
Condensation
Moderate

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 4°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Approximate height is enough, please do not share an exact wild-camp location.

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 30 mph may affect balance on exposed rock. Poor37/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look poor (37/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Peridotite (North Britain Palaeogene Dyke Suite). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Representative samples along available mapped routes also include Olivine-gabbro, Basalt and microgabbro and 2 other mapped types, so rock character and wet-weather behaviour may change across the mountain. Gusts may reach about 30 mph. Crosswinds can make exposed ridges substantially more serious. Cloud may also make route-finding and retreat harder.

Rock surfaceWet rock likelyPeak gust31 mphRain0.5 mm
Main factorsgusts around 30 mphwet rock likelymuch of the route may be in cloud
Mapped rock across the summit and available routes Peridotite North Britain Palaeogene Dyke Suite
Origin
Igneous
Rock family
Granite, gneiss or gabbro
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Moderate confidence
View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point mapping plus representative BGS bedrock samples along available GPX routes. These are not continuous geological surveys; contacts, superficial deposits and the exposed rock on individual holds may differ.

Rock groups along the sampled routes

These are mapped rock groups, not separate weather forecasts or a ranking of route safety.

Inaccessible Pinnacle

granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

5 rock types appear across the available route samples

The summit type remains the forecast's cautious rock-response reference. Other mapped types show where conditions may behave differently elsewhere on the mountain.

Summit mapping Peridotite North Britain Palaeogene Dyke Suite Around 970 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Olivine-gabbro Outer Gabbros, A1 (Cuillin Centre) 252–492 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Basalt and microgabbro North Britain Palaeogene Dyke Suite 12–129 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Tholeiitic microgabbro Outer Bytownite Troctolites, B1 (Cuillin Centre) 609–726 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Bytownite troctolite Outer Bytownite Troctolites, B3 (Cuillin Centre) Around 851 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

A broad surface report is enough; you do not need to identify a particular route.

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

Recommended kit for this dayWeather-aware packing prompts, plus your core hillwalking kitView kit

For a day hillwalk, not a complete route-specific checklist. Carry navigation and backup you can use, warm and waterproof layers, suitable footwear, food and water, a headtorch, emergency shelter, first aid and a way to call for help. Snow, ice, technical terrain and overnight trips need additional equipment and skills.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

Help the Mountain Decisions Project understand how forecasts influence hill days, including when plans stay the same. Findings will be shared publicly as summaries, not individual responses.

This is about Inaccessible Pinnacle on Monday 28 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Confidence: Unavailable
Overall hill weather0/100Severe hill conditions
Wind50-65 mph southerly Gusts85-95 mph Feels like-4 to 0°C PrecipitationAround 5-10 mm Cloud-free summit estimate80% Freezing levelAbove summit DaylightSunrise 07:23 · Sunset 19:05 · 11.7 hours daylight

The day on the hill

Strong gusts on Inaccessible Pinnacle: summit wind broadly 50-65 mph, with gusts 85-95 mph at times (storm-force mean winds at times). Visibility may drop briefly in showers.

Wind & exposure

Much calmer lower down - generally 15-25 mph in the valley, rising towards the tops.

Cloud & views

Cloud base mostly around 1200–1500 m through daylight. The summit is likely to stay mostly clear.

Cloud-height uncertainty could put the summit in or out of cloud. Clear spells may be difficult to time.

Cloud may hang lower on southern slopes and lift somewhat on the northern side, but local terrain can differ. Drizzle is forecast for much of the day, with some passing showers too.

The forecast total is around 5-10 mm, but local amounts will vary. Cold on exposed tops: air temperature broadly 4 to 8°C, feeling around -4 to 0°C in the wind.

Forecast models disagree markedly on summit wind strength. Check again nearer the time.

Keep windproof and warm layers readily available. If clothing gets wet, you can cool more quickly.

Keep a dry warm layer protected. Winds can make walking dangerous on exposed ground, with a risk of being blown over.

Avoid exposed ridges and edges.

Rain & temperature

The ground is likely to be wet after recent rain.

Forecast confidence

Overall confidence is unavailable: insufficient comparable wind, rain guidance.

0 is the bottom of the scale. Use the hazard details to judge how severe conditions could be.

Cloud-free timing: Around 65% early, improving to around 85% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 8.1 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Early
0 h
Midday
3.8 h
Later
3 h

Overnight forecast: 17:00–08:00 (UK local time), in Wild camping below.

Morning · 08:00–12:00 Severe hill conditions Summit winds around 40-50 mph early in the morning, strengthening to 50-60 mph later. Gusts around 75-85 mph are possible on exposed ground. The strongest gusts could knock you over on exposed ground. Avoid exposed ridges and edges. Rain is forecast during this period.
0/100
Afternoon · 12:00–17:00 Severe hill conditions Winds strengthen compared with the morning. Summit winds around 50-65 mph. Gusts around 85-95 mph are possible on exposed ground. Winds can make walking dangerous on exposed ground, with a risk of being blown over. Avoid exposed ridges and edges. Rain is forecast during this period.
0/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaExposed camping is not recommended near 300, 600 and 900 m: gusts may reach about 90 mph. Sustained winds may reach about 65 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. 0/100Poor · 600 m View detailsHide details
Night beginning Tuesday 29 September 2026

Full overnight outlook

Exposed camping is not recommended near 300, 600 and 900 m: gusts may reach about 90 mph. Sustained winds may reach about 65 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. Open-hillside camping looks very poor overall around 600 m (0/100). Peak gusts range from about 65 mph at 300 m to 90 mph at 900 m. Roughly 15.9 mm is forecast overnight, with rain liable to affect both pitching and packing up. Some condensation is possible overnight. The coldest temperature falls from about 8.6°C at 300 m to 4.9°C at 900 m.

Overnight rain15.9 mm Open ground · 600 m47 mph · gusts 77 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waning gibbous moon

Illuminated disc
87%
Moonrise
19:10 BST
Moonset
Outside this window

Extensive cloud may limit moonlight. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 29 Sep, 17:00 BST to 30 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m0/100 · very poor
Wind / gust
39 mph / 64 mph
Typical / low
9.2°C / 8.6°C · much of the night
In cloud
0% of modelled night
Condensation
Low
600 m0/100 · very poor
Wind / gust
47 mph / 77 mph
Typical / low
8.5°C / 7.6°C · much of the night
In cloud
0% of modelled night
Condensation
Low
900 m0/100 · very poor
Wind / gust
55 mph / 90 mph
Typical / low
5.3°C / 4.9°C · several hours
In cloud
0% of modelled night
Condensation
Moderate

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 4°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Approximate height is enough, please do not share an exact wild-camp location.

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 90 mph may affect balance on exposed rock. Poor0/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (0/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Peridotite (North Britain Palaeogene Dyke Suite). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Representative samples along available mapped routes also include Olivine-gabbro, Basalt and microgabbro and 2 other mapped types, so rock character and wet-weather behaviour may change across the mountain. Gusts may reach about 90 mph. Crosswinds can make exposed ridges substantially more serious.

Rock surfaceWet rock likelyPeak gust88 mphRain7.3 mm
Main factorsgusts around 90 mphwet rock likely
Mapped rock across the summit and available routes Peridotite North Britain Palaeogene Dyke Suite
Origin
Igneous
Rock family
Granite, gneiss or gabbro
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Moderate confidence
View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point mapping plus representative BGS bedrock samples along available GPX routes. These are not continuous geological surveys; contacts, superficial deposits and the exposed rock on individual holds may differ.

Rock groups along the sampled routes

These are mapped rock groups, not separate weather forecasts or a ranking of route safety.

Inaccessible Pinnacle

granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

5 rock types appear across the available route samples

The summit type remains the forecast's cautious rock-response reference. Other mapped types show where conditions may behave differently elsewhere on the mountain.

Summit mapping Peridotite North Britain Palaeogene Dyke Suite Around 970 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Olivine-gabbro Outer Gabbros, A1 (Cuillin Centre) 252–492 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Basalt and microgabbro North Britain Palaeogene Dyke Suite 12–129 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Tholeiitic microgabbro Outer Bytownite Troctolites, B1 (Cuillin Centre) 609–726 m samples Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record
Route sample Bytownite troctolite Outer Bytownite Troctolites, B3 (Cuillin Centre) Around 851 m Seen on Inaccessible Pinnacle

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

BGS record

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

A broad surface report is enough; you do not need to identify a particular route.

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

Recommended kit for this dayWeather-aware packing prompts, plus your core hillwalking kitView kit

For a day hillwalk, not a complete route-specific checklist. Carry navigation and backup you can use, warm and waterproof layers, suitable footwear, food and water, a headtorch, emergency shelter, first aid and a way to call for help. Snow, ice, technical terrain and overnight trips need additional equipment and skills.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

Help the Mountain Decisions Project understand how forecasts influence hill days, including when plans stay the same. Findings will be shared publicly as summaries, not individual responses.

This is about Inaccessible Pinnacle on Tuesday 29 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.

Forecast run: 2026-09-22

Keep exploring

Weather around Inaccessible Pinnacle.

Compare the summit forecast with the wider regional picture and nearby peaks before choosing a route.

Regional mountain forecastSkyeView area →
Sgùrr Mhic Chòinnich948 m · 0.8 km awayForecast →Sgùrr na Banachdich965 m · 0.9 km awayForecast →Sgùrr Alasdair992 m · 1.0 km awayForecast →Sgùrr a' Ghreadaidh973 m · 1.6 km awayForecast →

A forecast is part of the decision.

Mountain weather can differ sharply from conditions in the valley. Check official warnings, carry appropriate navigation and clothing, and be ready to change the plan. Read how Mountain Weather forecasts are produced and where their limits lie.

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