Mountain Weather

Mayar weather forecast.

928 m summit in Angus Glens. 8 forecast days covering wind, cloud, rain and temperature, updated 20 September 2026 at 08:46 UTC.

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Confidence: Medium
Overall hill weather42/100Poor
Wind25-50 mph westerly Gusts60-70 mph Feels like-4 to 0°C PrecipitationLittle or none Cloud-free summit estimate90% Freezing levelAbove summit DaylightSunrise 06:53 · Sunset 19:18 · 12.4 hours daylight

The day on the hill

Strong gusts on Mayar: summit wind broadly 25-50 mph, with gusts 60-70 mph at times (gale-force mean winds at times).

Wind & exposure

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

Cloud & views

Cloud base around 900–1200 m in the morning, lifting to 1500–1800 m around midday. 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.

Rain & temperature

Little or no rain is forecast. 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 43-50 mph at walker height, with gusts 61-70 mph.

Forecast confidence

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

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

Cloud-height uncertainty could put the summit in or out of cloud, even where forecasts agree on the wider cloud cover.

Cloud-free timing: Around 75% early, improving to around 95% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 8.4 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
1.1 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 35-45 mph early in the morning, easing to 20-30 mph later. Gusts around 55-65 mph are possible on exposed ground. The strongest gusts could knock you over on exposed ground. Avoid exposed ridges and edges.
32/100
Afternoon · 12:00–17:00 Mixed 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.
52/100

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

Overnight · 17:00–08:00Wild campingBetaGusts near 35 mph make meaningful shelter important. 59/100Mixed · 600 m View detailsHide details
Night beginning Sunday 20 September 2026

Full overnight outlook

Open-hillside camping looks mixed overall around 600 m (59/100). 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. Wind direction may change substantially during the night. Shelter that works at dusk may be less effective later. Little overnight rain is forecast. A wet pack-up remains possible from dew or brief dampness toward dawn. The coldest temperature falls from about 7.2°C at 300 m to 5.5°C at 900 m.

Overnight rain0.2 mm Open ground · 600 m16 mph · gusts 30 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc
70%
Moonrise
17:44 BST
Moonset
23:41 BST

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

Overnight window: 20 Sep, 17:00 BST to 21 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m88/100 · very good
Wind / gust
13 mph / 25 mph
Typical / low
7.8°C / 7.2°C · much of the night
In cloud
0% of modelled night
Condensation
Low
600 m59/100 · mixed
Wind / gust
16 mph / 30 mph
Typical / low
7.8°C / 7.2°C · much of the night
In cloud
0% of modelled night
Condensation
Low
900 m39/100 · poor
Wind / gust
18 mph / 35 mph
Typical / low
6.1°C / 5.5°C · much of the night
In cloud
0% 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.

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 & scramblingBetaGusts near 60 mph may affect balance on exposed rock. Poor20/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look poor (20/100). Rock is likely to be mostly dry, though seepage and shaded holds are not resolved. The mapped summit rock is Gritstone (Glen Lethnot Grit Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Representative samples along available mapped routes also include Dioritic-rock, Psammite and semipelite and 4 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.

Rock surfaceProbably dryPeak gust62 mphRain0.0 mm
Main concerngusts around 60 mph
Mapped rock across the summit and available routes Gritstone Glen Lethnot Grit Formation
Origin
Metamorphic
Rock family
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Low confidence
View the summit BGS record

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. 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.

Mayar and Driesh

unclassified rock, psammite, pelite or semipelite, schist or phyllite, granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

7 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 Gritstone Glen Lethnot Grit Formation

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Dioritic-rock Glen Doll Pluton 340–426 m samples Seen on Mayar and Driesh

Grip and drying behaviour are not well resolved here; treat damp rock conservatively and check the surface directly.

BGS record
Route sample Psammite and semipelite Glen Effock Schist Formation 857–946 m samples Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Amphibolite and hornblende schist Neoproterozoic Basic Minor Intrusion Suite Around 689 m Seen on Mayar and Driesh

Can be positive when dry, but mica-rich or foliated surfaces, vegetation and lichen may become much less dependable when wet.

BGS record
Route sample Gabbro Glen Doll Pluton Around 512 m Seen on Mayar and Driesh

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 Gneissose semipelite Duchray Hill Gneiss Member Around 770 m Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Microgranite North Britain Siluro-Devonian Calc-Alkaline Dyke Suite Around 600 m Seen on Mayar and Driesh

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 Mayar on Sunday 20 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 weather40/100Poor
Wind20-35 mph westerly Gusts35-45 mph Feels like0 to 4°C PrecipitationLittle or none Cloud-free summit estimate45% Cloud base through day600-1,100 m Freezing levelAbove summit DaylightSunrise 06:55 · Sunset 19:15 · 12.3 hours daylight

The day on the hill

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

Wind & exposure

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

Cloud & views

Cloud base around 800–1100 m through the morning, lowering to 600–900 m by late afternoon. 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.

Any sunshine may be confined to lower ground or breaks away from the summit.

Rain & temperature

Little or no rain is forecast. Forecast models differ on summit wind strength: around 23-37 mph at walker height, with gusts 32-52 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. Buffeting may affect balance on exposed ground, particularly near ridges and edges.

Summit wind could be roughly 23-37 mph, which changes how difficult exposed walking may feel.

Cloud-free timing: Around 60% early, falling to around 40% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 9.7 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 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 30-40 mph are possible on exposed ground.
42/100
Afternoon · 12:00–17:00 Poor Summit winds around 20-30 mph. Gusts around 35-45 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges.
37/100

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 50 mph. Sustained winds may reach about 35 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 Monday 21 September 2026

Full overnight outlook

Exposed camping is not recommended near 600 and 900 m: gusts may reach about 50 mph. Sustained winds may reach about 35 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 50 mph at 900 m. 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 11.7°C at 300 m to 10°C at 900 m.

Overnight rain0.0 mm Open ground · 600 m24 mph · gusts 42 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 8°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc
78%
Moonrise
18:01 BST
Moonset
01:04 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: 21 Sep, 17:00 BST to 22 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
20 mph / 35 mph
Typical / low
12.3°C / 11.7°C
In cloud
0% of modelled night
Condensation
High
600 m19/100 · very poor
Wind / gust
24 mph / 42 mph
Typical / low
12.3°C / 11.7°C
In cloud
0% of modelled night
Condensation
High
900 m9/100 · very poor
Wind / gust
28 mph / 50 mph
Typical / low
11.1°C / 10.0°C · a brief spell
In cloud
93% of modelled night
Condensation
High

Warmth planning: As a broad starting point, consider a 2-season bag with an ISO/EN comfort rating at or below about 8°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 & scramblingBetaPatchy rain could leave exposed holds damp or slippery. Gusts near 40 mph may affect balance on exposed rock. Poor13/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (13/100). Likely to stay mostly dry, but patchy rain remains possible and could leave exposed rock damp or slippery. The mapped summit rock is Gritstone (Glen Lethnot Grit Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Representative samples along available mapped routes also include Dioritic-rock, Psammite and semipelite and 4 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.

Rock surfaceDry initially; rain possiblePeak gust41 mphRainPossible · 85%
Main factorsgusts around 40 mphrain possible despite mostly dry conditions being favouredmuch of the route may be in cloud
Mapped rock across the summit and available routes Gritstone Glen Lethnot Grit Formation
Origin
Metamorphic
Rock family
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Low confidence
View the summit BGS record

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. 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.

Mayar and Driesh

unclassified rock, psammite, pelite or semipelite, schist or phyllite, granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

7 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 Gritstone Glen Lethnot Grit Formation

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Dioritic-rock Glen Doll Pluton 340–426 m samples Seen on Mayar and Driesh

Grip and drying behaviour are not well resolved here; treat damp rock conservatively and check the surface directly.

BGS record
Route sample Psammite and semipelite Glen Effock Schist Formation 857–946 m samples Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Amphibolite and hornblende schist Neoproterozoic Basic Minor Intrusion Suite Around 689 m Seen on Mayar and Driesh

Can be positive when dry, but mica-rich or foliated surfaces, vegetation and lichen may become much less dependable when wet.

BGS record
Route sample Gabbro Glen Doll Pluton Around 512 m Seen on Mayar and Driesh

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 Gneissose semipelite Duchray Hill Gneiss Member Around 770 m Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Microgranite North Britain Siluro-Devonian Calc-Alkaline Dyke Suite Around 600 m Seen on Mayar and Driesh

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 Mayar on Monday 21 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 weather42/100Poor
Wind15-35 mph southwesterly Gusts40-50 mph Feels like4 to 8°C PrecipitationAround 10-20 mm Cloud-free summit estimate15% Cloud base through day600-900 m Freezing levelAbove summit DaylightSunrise 06:57 · Sunset 19:13 · 12.3 hours daylight

The day on the hill

A wet day with extensive summit cloud on Mayar: summit wind broadly 15-35 mph, with gusts 40-50 mph at times (strong winds).

Things to watch

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 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. Any sunshine may be confined to lower ground or breaks away from the summit.

Drizzle is forecast for much of the day. The forecast total is around 10-20 mm, but local amounts will vary.

Forecast models differ on summit wind strength: around 21-41 mph at walker height, with gusts 30-58 mph.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Buffeting may affect balance on exposed ground, particularly near ridges and edges.

Summit wind could be roughly 21-41 mph, which changes how difficult exposed walking may feel.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 5.9 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
2.9 h
Midday
2 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. 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.
36/100
Afternoon · 12:00–17:00 Poor Winds ease compared with the morning. More rain is expected. Summit winds around 10-20 mph. Gusts around 25-35 mph are possible on exposed ground. Rain is forecast during this period. Some forecast models bring rain during the afternoon, while others keep it mostly dry.
49/100

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

Overnight · 17:00–08:00Wild campingBetaAbout 32.5 mm is forecast, with rain liable to affect both pitching and packing up. 39/100Poor · 600 m View detailsHide details
Night beginning Tuesday 22 September 2026

Full overnight outlook

Open-hillside camping looks poor overall around 600 m (39/100). It may be breezy on open ground, with gusts near 25 mph. Peak gusts range from about 15 mph at 300 m to 25 mph at 900 m. Roughly 32.5 mm is forecast overnight, with rain liable to affect both pitching and packing up. 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 6.9°C at 300 m to 5.2°C at 900 m.

Overnight rain32.5 mm Open ground · 600 m9 mph · gusts 19 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc
86%
Moonrise
18:12 BST
Moonset
02:29 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 m39/100 · poor
Wind / gust
7 mph / 16 mph
Typical / low
9.2°C / 6.9°C · several hours
In cloud
0% of modelled night
Condensation
High
600 m39/100 · poor
Wind / gust
9 mph / 19 mph
Typical / low
9.2°C / 6.8°C · several hours
In cloud
20% of modelled night
Condensation
High
900 m39/100 · poor
Wind / gust
10 mph / 23 mph
Typical / low
7.6°C / 5.2°C · much of the night
In cloud
87% 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 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 Gritstone (Glen Lethnot Grit Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Representative samples along available mapped routes also include Dioritic-rock, Psammite and semipelite and 4 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.

Rock surfaceWet rock likelyPeak gust41 mphRain6.6 mm
Main factorsgusts around 40 mphwet rock likelymuch of the route may be in cloud
Mapped rock across the summit and available routes Gritstone Glen Lethnot Grit Formation
Origin
Metamorphic
Rock family
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Low confidence
View the summit BGS record

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. 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.

Mayar and Driesh

unclassified rock, psammite, pelite or semipelite, schist or phyllite, granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

7 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 Gritstone Glen Lethnot Grit Formation

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Dioritic-rock Glen Doll Pluton 340–426 m samples Seen on Mayar and Driesh

Grip and drying behaviour are not well resolved here; treat damp rock conservatively and check the surface directly.

BGS record
Route sample Psammite and semipelite Glen Effock Schist Formation 857–946 m samples Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Amphibolite and hornblende schist Neoproterozoic Basic Minor Intrusion Suite Around 689 m Seen on Mayar and Driesh

Can be positive when dry, but mica-rich or foliated surfaces, vegetation and lichen may become much less dependable when wet.

BGS record
Route sample Gabbro Glen Doll Pluton Around 512 m Seen on Mayar and Driesh

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 Gneissose semipelite Duchray Hill Gneiss Member Around 770 m Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Microgranite North Britain Siluro-Devonian Calc-Alkaline Dyke Suite Around 600 m Seen on Mayar and Driesh

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 Mayar 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 weather42/100Poor
Wind10-25 mph northwesterly Gusts20-30 mph Feels like-2 to 2°C PrecipitationLittle or none Cloud-free summit estimate95% Freezing levelAbove summit DaylightSunrise 06:59 · Sunset 19:10 · 12.2 hours daylight

The day on the hill

Little rain and limited summit cloud on Mayar: summit wind broadly 10-25 mph, with gusts 20-30 mph at times (a fresh breeze).

Things to watch

Severe spate risk early in the day and into the morning, after earlier rain. 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.

Cloud & views

Cloud base around 1400–1700 m in the morning, then around 3000–3300 m around midday and 1500–1800 m by late afternoon. The summit is likely to stay mostly clear.

Cloud may hang lower on northwestern slopes and lift somewhat on the southeastern side, but local terrain can differ. Very little direct sunshine is forecast.

Rain & temperature

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

Little or no rain is forecast. Cold on exposed tops: air temperature broadly 4 to 8°C, feeling around -2 to 2°C in the wind.

Forecast models differ on summit wind strength: around 16-25 mph at walker height, with gusts 22-36 mph. A windproof layer will help, with an extra warm layer for stops.

Forecast confidence

Forecast models differ on whether meaningful rain reaches the hills during the afternoon and evening.

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 10-20 mph. Gusts around 15-25 mph are possible on exposed ground. Some forecast models bring rain during the morning, while others keep it mostly dry.
12/100
Afternoon · 12:00–17:00 Good Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground. Some forecast models bring rain during the afternoon, while others keep it mostly dry.
72/100

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

Overnight · 17:00–08:00Wild campingBetaA near freezing night is forecast near 900 m, with the cold lasting much of the night. 88/100Excellent · 600 m View detailsHide details
Night beginning Wednesday 23 September 2026

Full overnight outlook

Open-hillside camping looks very good overall around 600 m (88/100). A lower pitch near 300 m looks more comfortable. Conditions are less suitable by 900 m. It may be breezy on open ground, with gusts near 30 mph. Peak gusts range from about 20 mph at 300 m to 30 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. The coldest temperature falls from about 6°C at 300 m to 1.9°C at 900 m.

Overnight rain0.0 mm Open ground · 600 m11 mph · gusts 25 mph Morning pack-upNo wet signal Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc
92%
Moonrise
18:19 BST
Moonset
03:54 next morning BST

Clear spells may allow a view of the Moon. 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 m88/100 · very good
Wind / gust
9 mph / 21 mph
Typical / low
7.0°C / 6.0°C · much of the night
In cloud
0% of modelled night
Condensation
Low
600 m88/100 · very good
Wind / gust
11 mph / 25 mph
Typical / low
7.0°C / 6.0°C · much of the night
In cloud
0% of modelled night
Condensation
Low
900 m59/100 · mixed
Wind / gust
13 mph / 29 mph
Typical / low
3.3°C / 1.9°C · much of the night
In cloud
0% 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 & scramblingBetaRock may be damp or still drying. Poor40/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look mixed (40/100). Recent rain may leave seepage and damp rock, especially on shaded sections. The mapped summit rock is Gritstone (Glen Lethnot Grit Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Representative samples along available mapped routes also include Dioritic-rock, Psammite and semipelite and 4 other mapped types, so rock character and wet-weather behaviour may change across the mountain.

Rock surfaceDry overhead; seepage uncertainPeak gust26 mphRainPossible · 88%
Main concerndamp or incompletely dried rock possible
Mapped rock across the summit and available routes Gritstone Glen Lethnot Grit Formation
Origin
Metamorphic
Rock family
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Low confidence
View the summit BGS record

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. 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.

Mayar and Driesh

unclassified rock, psammite, pelite or semipelite, schist or phyllite, granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

7 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 Gritstone Glen Lethnot Grit Formation

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Dioritic-rock Glen Doll Pluton 340–426 m samples Seen on Mayar and Driesh

Grip and drying behaviour are not well resolved here; treat damp rock conservatively and check the surface directly.

BGS record
Route sample Psammite and semipelite Glen Effock Schist Formation 857–946 m samples Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Amphibolite and hornblende schist Neoproterozoic Basic Minor Intrusion Suite Around 689 m Seen on Mayar and Driesh

Can be positive when dry, but mica-rich or foliated surfaces, vegetation and lichen may become much less dependable when wet.

BGS record
Route sample Gabbro Glen Doll Pluton Around 512 m Seen on Mayar and Driesh

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 Gneissose semipelite Duchray Hill Gneiss Member Around 770 m Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Microgranite North Britain Siluro-Devonian Calc-Alkaline Dyke Suite Around 600 m Seen on Mayar and Driesh

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 Mayar 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 weather70/100Good
Wind15-30 mph southerly Gusts35-45 mph Feels like-6 to -2°C PrecipitationLittle or none Cloud-free summit estimate90% Freezing levelAbove summit DaylightSunrise 07:01 · Sunset 19:07 · 12.1 hours daylight

The day on the hill

On Mayar: summit wind broadly 15-30 mph, with gusts 35-45 mph at times (strong winds).

Cloud & views

Cloud base around 1200–1500 m in the morning, then around 1400–1700 m around midday and 1000–1300 m by late afternoon. 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.

Rain & temperature

The ground is likely to be wet after recent rain. Little or no rain is forecast.

Cold on exposed tops: air temperature broadly 0 to 4°C, feeling around -6 to -2°C in the wind. Forecast models differ on summit wind strength: around 21-35 mph at walker height, with gusts 30-49 mph.

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. Summit wind could be roughly 21-35 mph, which changes how difficult exposed walking may feel.

Cloud-free timing: Best around midday at about 95%, compared with around 85% early and 85% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 7.8 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
2 h
Midday
4 h
Later
0 h

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

Morning · 08:00–12:00 Good Summit winds around 10-25 mph. Gusts around 25-35 mph are possible on exposed ground.
72/100
Afternoon · 12:00–17:00 Mixed Summit winds around 15-25 mph. Gusts around 30-40 mph are possible on exposed ground.
69/100

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. 39/100Poor · 600 m View detailsHide details
Night beginning Thursday 24 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 poor overall around 600 m (39/100). Peak gusts range from about 30 mph at 300 m to 45 mph at 900 m. Around 3 mm is forecast, including rain around pack-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 8°C at 300 m to 5.7°C at 900 m.

Overnight rain3.0 mm Open ground · 600 m23 mph · gusts 37 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc
97%
Moonrise
18:25 BST
Moonset
05:19 next morning BST

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: 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 m59/100 · mixed
Wind / gust
19 mph / 31 mph
Typical / low
8.9°C / 8.0°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m39/100 · poor
Wind / gust
23 mph / 37 mph
Typical / low
8.9°C / 7.9°C · much of the night
In cloud
67% of modelled night
Condensation
High
900 m19/100 · very poor
Wind / gust
27 mph / 44 mph
Typical / low
6.8°C / 5.7°C · much of the night
In cloud
73% 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 & scramblingBetaRock may be damp or still drying. Gusts near 35 mph may affect balance on exposed rock. Mixed53/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look mixed (53/100). Recent rain may leave seepage and damp rock, especially on shaded sections. The mapped summit rock is Gritstone (Glen Lethnot Grit Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Representative samples along available mapped routes also include Dioritic-rock, Psammite and semipelite and 4 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.

Rock surfaceDry overhead; seepage uncertainPeak gust33 mphRainPossible · 35%
Main factorsgusts around 35 mphdamp or incompletely dried rock possible
Mapped rock across the summit and available routes Gritstone Glen Lethnot Grit Formation
Origin
Metamorphic
Rock family
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Low confidence
View the summit BGS record

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. 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.

Mayar and Driesh

unclassified rock, psammite, pelite or semipelite, schist or phyllite, granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

7 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 Gritstone Glen Lethnot Grit Formation

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Dioritic-rock Glen Doll Pluton 340–426 m samples Seen on Mayar and Driesh

Grip and drying behaviour are not well resolved here; treat damp rock conservatively and check the surface directly.

BGS record
Route sample Psammite and semipelite Glen Effock Schist Formation 857–946 m samples Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Amphibolite and hornblende schist Neoproterozoic Basic Minor Intrusion Suite Around 689 m Seen on Mayar and Driesh

Can be positive when dry, but mica-rich or foliated surfaces, vegetation and lichen may become much less dependable when wet.

BGS record
Route sample Gabbro Glen Doll Pluton Around 512 m Seen on Mayar and Driesh

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 Gneissose semipelite Duchray Hill Gneiss Member Around 770 m Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Microgranite North Britain Siluro-Devonian Calc-Alkaline Dyke Suite Around 600 m Seen on Mayar and Driesh

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 Mayar 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.

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

Confidence: Medium
Overall hill weather51/100Mixed
Wind10-25 mph southwesterly Gusts20-30 mph Feels like2 to 6°C PrecipitationAround 10-20 mm Cloud-free summit estimate10% Cloud base through day500-800 m Freezing levelAbove summit DaylightSunrise 07:03 · Sunset 19:05 · 12.0 hours daylight

The day on the hill

A wet day with extensive summit cloud on Mayar: summit wind broadly 10-25 mph, with gusts 20-30 mph at times (a moderate breeze). Visibility may drop briefly in showers.

Cloud & views

Cloud base mostly around 500–800 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. 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 10-20 mm, but local amounts will vary.

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. 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. Some forecast models bring rain during the main walking period, while others keep it mostly dry.

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.

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
Less than 1 hour
Midday
4 h
Later
3 h

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

Morning · 08:00–12:00 Mixed Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground. Rain is forecast during this period. Some forecast models bring rain during the morning, while others keep it mostly dry.
54/100
Afternoon · 12:00–17:00 Poor Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground. Rain is forecast during this period. Some forecast models bring rain during the afternoon, while others keep it mostly dry.
48/100

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

Overnight · 17:00–08:00Wild campingBetaAbout 3 mm is forecast, with rain possible around pitching time. 70/100Good · 600 m View detailsHide details
Night beginning Friday 25 September 2026

Full overnight outlook

Open-hillside camping looks reasonable overall around 600 m (70/100). Light winds are expected on open ground, though local shelter and exposure still matter. Peak gusts range from about 15 mph at 300 m to 20 mph at 900 m. Around 3 mm is forecast, 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 900 m. Ventilation will matter. The coldest temperature falls from about 7.4°C at 300 m to 1°C at 900 m.

Overnight rain3.0 mm Open ground · 600 m9 mph · gusts 16 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Near-full moon

Illuminated disc
99%
Moonrise
18:30 BST
Moonset
06:45 next morning BST

Clear spells may allow a view of the Moon. 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 m70/100 · reasonable
Wind / gust
8 mph / 14 mph
Typical / low
9.8°C / 7.4°C · several hours
In cloud
0% of modelled night
Condensation
Low
600 m70/100 · reasonable
Wind / gust
9 mph / 16 mph
Typical / low
9.6°C / 7.2°C · much of the night
In cloud
33% of modelled night
Condensation
Moderate
900 m59/100 · mixed
Wind / gust
11 mph / 19 mph
Typical / low
4.8°C / 1.0°C · several hours
In cloud
33% 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. Poor4/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (4/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Gritstone (Glen Lethnot Grit Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Representative samples along available mapped routes also include Dioritic-rock, Psammite and semipelite and 4 other mapped types, so rock character and wet-weather behaviour may change across the mountain. Cloud may also make route-finding and retreat harder.

Rock surfaceWet rock likelyPeak gust25 mphRain11.7 mm
Main factorswet rock likelymuch of the route may be in cloud
Mapped rock across the summit and available routes Gritstone Glen Lethnot Grit Formation
Origin
Metamorphic
Rock family
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Low confidence
View the summit BGS record

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. 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.

Mayar and Driesh

unclassified rock, psammite, pelite or semipelite, schist or phyllite, granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

7 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 Gritstone Glen Lethnot Grit Formation

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Dioritic-rock Glen Doll Pluton 340–426 m samples Seen on Mayar and Driesh

Grip and drying behaviour are not well resolved here; treat damp rock conservatively and check the surface directly.

BGS record
Route sample Psammite and semipelite Glen Effock Schist Formation 857–946 m samples Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Amphibolite and hornblende schist Neoproterozoic Basic Minor Intrusion Suite Around 689 m Seen on Mayar and Driesh

Can be positive when dry, but mica-rich or foliated surfaces, vegetation and lichen may become much less dependable when wet.

BGS record
Route sample Gabbro Glen Doll Pluton Around 512 m Seen on Mayar and Driesh

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 Gneissose semipelite Duchray Hill Gneiss Member Around 770 m Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Microgranite North Britain Siluro-Devonian Calc-Alkaline Dyke Suite Around 600 m Seen on Mayar and Driesh

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 Mayar 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: Unavailable
Overall hill weather87/100Excellent
Wind10-30 mph southwesterly Gusts30-40 mph Feels like-6 to -2°C PrecipitationUp to around 2 mm Cloud-free summit estimate90% Freezing level800-1,100 m DaylightSunrise 07:05 · Sunset 19:02 · 11.9 hours daylight

The day on the hill

On Mayar: summit wind broadly 10-30 mph, with gusts 30-40 mph at times (a fresh breeze). Patchy mist is possible in sheltered valleys early on.

Wind & exposure

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

Cloud & views

Cloud base mostly around 1300–1600 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 southwestern slopes and lift somewhat on the northeastern side, but local terrain can differ. Drizzle is forecast for much of the day, with some passing showers too.

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

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

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.

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

Cloud-free timing: Around 95% early, falling to around 80% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 10.9 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.

Early
2 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 Excellent Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Rain is forecast during this period.
96/100
Afternoon · 12:00–17:00 Good Winds strengthen compared with the morning. Summit winds around 5-15 mph in the early afternoon, strengthening to 15-25 mph later. Gusts around 25-35 mph are possible on exposed ground. Rain is forecast during this period.
78/100

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 50 mph. Sustained winds may reach about 35 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 Saturday 26 September 2026

Full overnight outlook

Exposed camping is not recommended near 600 and 900 m: gusts may reach about 50 mph. Sustained winds may reach about 35 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 50 mph at 900 m. Around 2 mm is forecast, with rain liable to affect both pitching and packing up. 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 8.3°C at 300 m to 6.1°C at 900 m.

Overnight rain2.0 mm Open ground · 600 m27 mph · gusts 44 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 6°C or lower

Moon overnight

Near-full moon

Illuminated disc
100%
Moonrise
18:35 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: 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 m39/100 · poor
Wind / gust
22 mph / 36 mph
Typical / low
8.5°C / 8.3°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m19/100 · very poor
Wind / gust
27 mph / 44 mph
Typical / low
8.5°C / 8.3°C · much of the night
In cloud
0% of modelled night
Condensation
High
900 m9/100 · very poor
Wind / gust
32 mph / 51 mph
Typical / low
6.7°C / 6.1°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 6°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. Poor43/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look mixed (43/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Gritstone (Glen Lethnot Grit Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Representative samples along available mapped routes also include Dioritic-rock, Psammite and semipelite and 4 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.

Rock surfaceWet rock likelyPeak gust32 mphRain1.2 mm
Main factorsgusts around 30 mphwet rock likely
Mapped rock across the summit and available routes Gritstone Glen Lethnot Grit Formation
Origin
Metamorphic
Rock family
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Low confidence
View the summit BGS record

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. 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.

Mayar and Driesh

unclassified rock, psammite, pelite or semipelite, schist or phyllite, granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

7 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 Gritstone Glen Lethnot Grit Formation

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Dioritic-rock Glen Doll Pluton 340–426 m samples Seen on Mayar and Driesh

Grip and drying behaviour are not well resolved here; treat damp rock conservatively and check the surface directly.

BGS record
Route sample Psammite and semipelite Glen Effock Schist Formation 857–946 m samples Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Amphibolite and hornblende schist Neoproterozoic Basic Minor Intrusion Suite Around 689 m Seen on Mayar and Driesh

Can be positive when dry, but mica-rich or foliated surfaces, vegetation and lichen may become much less dependable when wet.

BGS record
Route sample Gabbro Glen Doll Pluton Around 512 m Seen on Mayar and Driesh

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 Gneissose semipelite Duchray Hill Gneiss Member Around 770 m Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Microgranite North Britain Siluro-Devonian Calc-Alkaline Dyke Suite Around 600 m Seen on Mayar and Driesh

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 Mayar 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: Unavailable
Overall hill weather40/100Poor
Wind20-40 mph southwesterly Gusts40-50 mph Feels like-2 to 2°C PrecipitationAround 5-10 mm Cloud-free summit estimate85% Cloud base through day1,000-1,600 m Freezing levelAbove summit DaylightSunrise 07:07 · Sunset 18:59 · 11.9 hours daylight

The day on the hill

Strong gusts on Mayar: summit wind broadly 20-40 mph, with gusts 40-50 mph at times (strong winds). Visibility may drop briefly in showers.

Wind & exposure

Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Gusts may knock you off balance on exposed ground, even between spells of lighter wind.

Cloud & views

Cloud base around 1000–1300 m in the morning, lifting to 1300–1600 m around midday. 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.

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 -2 to 2°C in the wind. Forecast models differ on summit wind strength.

Treat the wind figures as a guide. 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.

Forecast confidence

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

Cloud-free timing: Around 45% early, improving to around 95% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 7.8 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
Less than 1 hour
Midday
3.5 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 25-35 mph. Gusts around 40-50 mph are possible on exposed ground. Gusts may knock you off balance on exposed ground, even between spells of lighter wind. Summit cloud is more persistent early in this period, with better prospects later. Rain is forecast during this period.
19/100
Afternoon · 12:00–17:00 Mixed Summit winds around 20-30 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.
61/100

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

Overnight · 17:00–08:00Wild campingBetaGusts near 35 mph make meaningful shelter important. 59/100Mixed · 600 m View detailsHide details
Night beginning Sunday 27 September 2026

Full overnight outlook

Open-hillside camping looks mixed overall around 600 m (59/100). 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. A little rain may coincide with pitching or packing up. 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 and 900 m. Ventilation will matter. The coldest temperature falls from about 4.9°C at 300 m to 2.7°C at 900 m. Around 600 m it looks cold for several hours, rather than only dipping briefly to 4.9°C.

Overnight rain0.9 mm Open ground · 600 m18 mph · gusts 28 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 2°C or lower

Moon overnight

Waning gibbous moon

Illuminated disc
98%
Moonrise
18:41 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 m64/100 · reasonable
Wind / gust
15 mph / 23 mph
Typical / low
6.0°C / 4.9°C · several hours
In cloud
0% of modelled night
Condensation
High
600 m59/100 · mixed
Wind / gust
18 mph / 28 mph
Typical / low
6.0°C / 4.9°C · several hours
In cloud
0% of modelled night
Condensation
Moderate
900 m54/100 · mixed
Wind / gust
21 mph / 33 mph
Typical / low
3.2°C / 2.7°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 2°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 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 Gritstone (Glen Lethnot Grit Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Representative samples along available mapped routes also include Dioritic-rock, Psammite and semipelite and 4 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.

Rock surfaceWet rock likelyPeak gust47 mphRain6.6 mm
Main factorsgusts around 45 mphwet rock likely
Mapped rock across the summit and available routes Gritstone Glen Lethnot Grit Formation
Origin
Metamorphic
Rock family
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Rock-response profile
Low confidence
View the summit BGS record

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. 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.

Mayar and Driesh

unclassified rock, psammite, pelite or semipelite, schist or phyllite, granite, gneiss or gabbro

Geological detail and BGS records
Mapped variation

7 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 Gritstone Glen Lethnot Grit Formation

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Dioritic-rock Glen Doll Pluton 340–426 m samples Seen on Mayar and Driesh

Grip and drying behaviour are not well resolved here; treat damp rock conservatively and check the surface directly.

BGS record
Route sample Psammite and semipelite Glen Effock Schist Formation 857–946 m samples Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Amphibolite and hornblende schist Neoproterozoic Basic Minor Intrusion Suite Around 689 m Seen on Mayar and Driesh

Can be positive when dry, but mica-rich or foliated surfaces, vegetation and lichen may become much less dependable when wet.

BGS record
Route sample Gabbro Glen Doll Pluton Around 512 m Seen on Mayar and Driesh

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 Gneissose semipelite Duchray Hill Gneiss Member Around 770 m Seen on Mayar and Driesh

Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.

BGS record
Route sample Microgranite North Britain Siluro-Devonian Calc-Alkaline Dyke Suite Around 600 m Seen on Mayar and Driesh

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 Mayar 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

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

Forecast run: 2026-09-20

Keep exploring

Weather around Mayar.

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

Regional mountain forecastAngus GlensView area →
Driesh947 m · 3.0 km awayForecast →Tom Buidhe957 m · 5.7 km awayForecast →Tolmount958 m · 7.0 km awayForecast →Monamenach807 m · 7.2 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.

Choose another summit