Select a day to replace the detailed forecast below. 8 forecast days are available here.
Confidence: Medium
Overall hill weather30/100Poor
Wind10-25 mph southwesterlyGusts25-35 mphFeels like4 to 8°CPrecipitationAround 10-20 mmCloud-free summit estimate30%Cloud base through day600-900 mFreezing levelAbove summitDaylightSunrise 07:03 · Sunset 19:19 · 12.3 hours daylight
The day on the hill
A wet day with extensive summit cloud on Càrn Dearg: summit wind broadly 10-25 mph, with gusts 25-35 mph at times (a fresh breeze). Hill cloud may make navigation difficult, with very poor visibility in wetter spells.
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 around 10-20 mm, but local amounts will vary.
Forecast models differ on summit wind strength: around 19-25 mph at walker height, with gusts 27-36 mph.
Forecast confidence
Cloud height remains uncertain, especially where it is close to summit level. 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.
Morning · 08:00–12:00
PoorSummit winds around 15-25 mph. Gusts around 25-35 mph are possible on exposed ground. Rain is forecast during this period.
15/100
Afternoon · 12:00–17:00
PoorWinds ease compared with the morning. Summit winds around 5-20 mph. Gusts around 15-25 mph are possible on exposed ground. Rain is forecast during this period. Rain is possible during the afternoon, but forecast models disagree on whether it will fall.
45/100
Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaAbout 25.1 mm is forecast, with rain liable to affect both pitching and packing up.39/100Poor · 600 mView 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 20 mph. Roughly 25.1 mm is forecast overnight, with rain liable to affect both pitching and packing up. Condensation risk is high near 300 and 600 m, so a wet pack-up is possible. Ventilation will matter.
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
8 mph / 16 mph
Typical / low
8.6°C / 6.5°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m39/100 · poor
Wind / gust
9 mph / 20 mph
Typical / low
8.6°C / 6.5°C · much of the night
In cloud
13% 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.
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Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 30 mph may affect balance on exposed rock.Poor0/100View 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 Psammite (Auchivarie Psammite Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. 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 mphRain9.1 mm
Main factorsgusts around 30 mphwet rock likelymuch of the route may be in cloud
Mapped summit rock
PsammiteAuchivarie Psammite Formation
Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.
Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback →
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 Càrn Dearg on Tuesday 22 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Wind10-25 mph northwesterlyGusts20-30 mphFeels like-2 to 2°CPrecipitationLittle or noneCloud-free summit estimate65%Cloud base through day600-1,300 mFreezing levelAbove summitDaylightSunrise 07:05 · Sunset 19:16 · 12.2 hours daylight
The day on the hill
Little rain and limited summit cloud on Càrn Dearg: summit wind broadly 10-25 mph, with gusts 20-30 mph at times (a moderate breeze).
Things to watch
High spate risk during 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 600–900 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.
Cloud may hang lower on northwestern slopes and lift somewhat on the southeastern 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.
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 4 to 8°C, feeling around -2 to 2°C in the wind.
Forecast confidence
Cloud height remains uncertain, especially where it is close to summit level. A windproof layer will help, with an extra warm layer for stops.
Cloud-height uncertainty could put the summit in or out of cloud, even where forecasts agree on the wider cloud cover.
Cloud-free timing: Cloudy early, clearing later.
Sunshine context Model-grid estimate, not summit sunshine
The surrounding model grid indicates 6.3 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.
Morning · 08:00–12:00
MixedSummit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.
50/100
Afternoon · 12:00–17:00
GoodSummit winds around 10-20 mph. Gusts around 15-25 mph are possible on exposed ground.
83/100
Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaGusts near 30 mph make meaningful shelter important.59/100Mixed · 600 mView detailsHide details
Night beginning Wednesday 23 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 600 m. Open-ground gusts may reach about 30 mph. Seek meaningful shelter. Peak gusts range from about 25 mph at 300 m to 30 mph at 600 m. Wind direction may change substantially during the night. Shelter that works at dusk may be less effective later. Little overnight rain is forecast.
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 m77/100 · promising
Wind / gust
9 mph / 25 mph
Typical / low
6.2°C / 5.8°C · much of the night
In cloud
0% of modelled night
Condensation
Low
600 m59/100 · mixed
Wind / gust
11 mph / 30 mph
Typical / low
6.2°C / 5.8°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 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.
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Daytime · exposed rockClimbing & scramblingBetaRock may be damp or still drying.Poor43/100View detailsHide details
Generic exposed-rock guidance
Full climbing & scrambling outlook
Conditions for exposed scrambling look mixed (43/100). Recent rain may leave seepage and damp rock, especially on shaded sections. The mapped summit rock is Psammite (Auchivarie Psammite Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.
Rock surfaceDry overhead; seepage uncertainPeak gust26 mphRainPossible · 78%
Main concerndamp or incompletely dried rock possible
Mapped summit rock
PsammiteAuchivarie Psammite Formation
Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.
Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback →
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 Càrn Dearg on Wednesday 23 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Wind25-40 mph southerlyGusts45-55 mphFeels like-4 to 0°CPrecipitationAround 2-5 mmCloud-free summit estimate90%Cloud base through day1,100-1,700 mFreezing levelAbove summitDaylightSunrise 07:07 · Sunset 19:13 · 12.1 hours daylight
The day on the hill
Strong gusts on Càrn Dearg: summit wind broadly 25-40 mph, with gusts 45-55 mph at times (strong winds).
Wind & exposure
Gusts may knock you off balance on exposed ground, even between spells of lighter wind.
Cloud & views
Cloud base around 1100–1400 m in the morning, lifting to 1300–1600 m around midday and 1400–1700 m by late afternoon. The summit is likely to stay mostly clear.
Cloud may hang lower on southern slopes and lift somewhat on the northern side, but local terrain can differ. Drizzle is forecast at times.
The forecast total is around 2-5 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 30-40 mph at walker height, with gusts 42-56 mph. Keep windproof and warm layers readily available.
If clothing gets wet, you can cool more quickly. Keep a dry warm layer protected.
Rain & temperature
The ground is likely to be wet after recent rain.
Forecast confidence
Forecast models differ on whether meaningful rain reaches the hills during the afternoon and evening.
Cloud-free timing: Around 95% early, falling to around 85% later.
Sunshine context Model-grid estimate, not summit sunshine
The surrounding model grid indicates 5.1 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.
Morning · 08:00–12:00
MixedSummit winds around 20-35 mph. Gusts around 35-45 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges.
53/100
Afternoon · 12:00–17:00
PoorSummit winds around 25-35 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 afternoon, but forecast models disagree on whether it will fall.
39/100
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 m: gusts may reach about 45 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 mView detailsHide details
Night beginning Thursday 24 September 2026
Full overnight outlook
Exposed camping is not recommended near 600 m: gusts may reach about 45 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 40 mph at 300 m to 45 mph at 600 m. Roughly 7.3 mm is forecast overnight, including rain around pitching time. Pitches near 600 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 m. Ventilation will matter.
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 m39/100 · poor
Wind / gust
22 mph / 38 mph
Typical / low
8.8°C / 7.7°C · much of the night
In cloud
0% of modelled night
Condensation
Moderate
600 m19/100 · very poor
Wind / gust
27 mph / 46 mph
Typical / low
8.2°C / 7.2°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.
Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback →
Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 50 mph may affect balance on exposed rock.Poor0/100View 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 Psammite (Auchivarie Psammite Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Gusts may reach about 50 mph. Crosswinds can make exposed ridges substantially more serious.
Rock surfaceWet rock likelyPeak gust48 mphRain0.6 mm
Main factorsgusts around 50 mphwet rock likely
Mapped summit rock
PsammiteAuchivarie Psammite Formation
Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.
Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback →
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 Càrn Dearg on Thursday 24 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Wind20-30 mph southwesterlyGusts35-45 mphFeels like-2 to 2°CPrecipitationAround 2-5 mmCloud-free summit estimate40%Cloud base through day700-1,000 mFreezing levelAbove summitDaylightSunrise 07:09 · Sunset 19:10 · 12.0 hours daylight
The day on the hill
A wet day with extensive summit cloud on Càrn Dearg: summit wind broadly 20-30 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 mostly around 700–1000 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 2-5 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: around 20-32 mph at walker height, with gusts 28-45 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. 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. Cloud-height uncertainty could put the summit in or out of cloud, even where forecasts agree on the wider cloud cover.
Sunshine context Model-grid estimate, not summit sunshine
The surrounding model grid indicates 11 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.
Morning · 08:00–12:00
PoorSummit 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.
30/100
Afternoon · 12:00–17:00
PoorSummit winds around 20-30 mph. Gusts around 30-40 mph are possible on exposed ground. Rain is forecast during this period.
28/100
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.39/100Poor · 600 mView detailsHide details
Night beginning Friday 25 September 2026
Full overnight outlook
Open-hillside camping looks poor overall around 600 m (39/100). A lower pitch near 300 m looks more comfortable. Conditions are less suitable by 600 m. Open-ground gusts may reach about 35 mph. Seek meaningful shelter. Peak gusts range from about 30 mph at 300 m to 35 mph at 600 m. Around 3.4 mm is forecast, with rain liable to affect both pitching and packing up. Pitches near 600 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 m. Ventilation will matter.
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: 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 m59/100 · mixed
Wind / gust
19 mph / 30 mph
Typical / low
7.7°C / 6.6°C · much of the night
In cloud
0% of modelled night
Condensation
Moderate
600 m39/100 · poor
Wind / gust
23 mph / 36 mph
Typical / low
7.2°C / 6.1°C · much of the night
In cloud
80% 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.
Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback →
Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 40 mph may affect balance on exposed rock.Poor7/100View detailsHide details
Generic exposed-rock guidance
Full climbing & scrambling outlook
Conditions for exposed scrambling look very poor (7/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Psammite (Auchivarie Psammite Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. 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 gust38 mphRain1.8 mm
Main factorsgusts around 40 mphwet rock likelymuch of the route may be in cloud
Mapped summit rock
PsammiteAuchivarie Psammite Formation
Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.
Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback →
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 Càrn Dearg on Friday 25 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Wind25-40 mph southwesterlyGusts45-55 mphFeels like-2 to 2°CPrecipitationAround 2-5 mmCloud-free summit estimate35%Cloud base through day500-1,200 mFreezing levelAbove summitDaylightSunrise 07:11 · Sunset 19:08 · 11.9 hours daylight
The day on the hill
Strong gusts and frequent summit cloud on Càrn Dearg: summit wind broadly 25-40 mph, with gusts 45-55 mph at times (strong winds). 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 10-20 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 500–800 m in the morning, then around 900–1200 m around midday and 700–1000 m by late afternoon. Cloud is likely to cover the top for much of the day, though a brief clearance is possible from midday into the afternoon.
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 2-5 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: around 27-39 mph at walker height, with gusts 37-55 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.
Some forecast models bring rain during the main walking period, while others keep it mostly dry.
Cloud-free timing: Around 15% early, improving to around 35% later.
Sunshine context Model-grid estimate, not summit sunshine
The surrounding model grid indicates 7.1 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.
Morning · 08:00–12:00
PoorSummit 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.
25/100
Afternoon · 12:00–17:00
PoorSummit 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 becomes more persistent later. Rain is forecast during this period. Some forecast models bring rain during the afternoon, while others keep it mostly dry.
26/100
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 m: gusts may reach about 45 mph. Sustained winds may reach about 30 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out.19/100Poor · 600 mView detailsHide details
Night beginning Saturday 26 September 2026
Full overnight outlook
Exposed camping is not recommended near 600 m: gusts may reach about 45 mph. Sustained winds may reach about 30 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 45 mph at 600 m. Roughly 28.4 mm is forecast overnight, with rain liable to affect both pitching and packing up. Pitches near 600 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 m. Ventilation will matter.
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
24 mph / 37 mph
Typical / low
10.5°C / 8.9°C · several hours
In cloud
0% of modelled night
Condensation
Moderate
600 m19/100 · very poor
Wind / gust
29 mph / 45 mph
Typical / low
9.7°C / 7.9°C · much of the night
In cloud
40% 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.
Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback →
Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 50 mph may affect balance on exposed rock.Poor0/100View 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 Psammite (Auchivarie Psammite Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Gusts may reach about 50 mph. Crosswinds can make exposed ridges substantially more serious. Cloud may also make route-finding and retreat harder.
Rock surfaceWet rock likelyPeak gust48 mphRain4.2 mm
Main factorsgusts around 50 mphwet rock likelymuch of the route may be in cloud
Mapped summit rock
PsammiteAuchivarie Psammite Formation
Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.
Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback →
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 Càrn Dearg on Saturday 26 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Wind15-30 mph southwesterlyGusts30-40 mphFeels like-2 to 2°CPrecipitationAround 2-5 mmCloud-free summit estimate75%Cloud base through day1,000-2,100 mFreezing levelAbove summitDaylightSunrise 07:13 · Sunset 19:05 · 11.9 hours daylight
The day on the hill
A wet day on Càrn Dearg: summit wind broadly 15-30 mph, with gusts 30-40 mph at times (a fresh breeze). Visibility may drop briefly in showers.
Things to watch
High spate risk through much of the day and into the evening, with recent and forecast rain and subsequent runoff. 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-height uncertainty could put the summit in or out of cloud.
Clear spells may be difficult to time.
Cloud & views
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 around 2-5 mm, but local amounts will vary. Cold on exposed tops: air temperature broadly 2 to 6°C, feeling around -2 to 2°C in the wind.
Forecast models differ on summit wind strength: around 19-27 mph at walker height, with gusts 27-38 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.
Forecast models differ on whether meaningful rain reaches the hills during the afternoon and evening.
Cloud-free timing: Cloudier around midday at about 60%, compared with around 80% early and 80% 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.
Morning · 08:00–12:00
PoorSummit winds around 20-30 mph. Gusts around 30-40 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.
39/100
Afternoon · 12:00–17:00
PoorSummit winds around 15-25 mph. Gusts around 30-40 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later. Rain is forecast during this period. Rain is possible during the afternoon, but forecast models disagree on whether it will fall.
39/100
Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaConditions look promising, but forecast uncertainty caps the grade at 82/100.82/100Good · 600 mView detailsHide details
Night beginning Sunday 27 September 2026
Full overnight outlook
Open-hillside camping looks promising overall around 600 m (82/100). It may be breezy on open ground, with gusts near 20 mph. Little overnight rain is forecast. Forecast models are not closely enough agreed for an exceptional grade. The grade is capped at 82/100.
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 m82/100 · promising
Wind / gust
12 mph / 19 mph
Typical / low
7.4°C / 7.0°C · much of the night
In cloud
0% of modelled night
Condensation
Low
600 m82/100 · promising
Wind / gust
14 mph / 22 mph
Typical / low
6.5°C / 6.2°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.
Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback →
Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 35 mph may affect balance on exposed rock.Poor15/100View detailsHide details
Generic exposed-rock guidance
Full climbing & scrambling outlook
Conditions for exposed scrambling look very poor (15/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Psammite (Auchivarie Psammite Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Gusts may reach about 35 mph. Crosswinds can make exposed ridges substantially more serious.
Rock surfaceWet rock likelyPeak gust34 mphRain4.8 mm
Main factorsgusts around 35 mphwet rock likely
Mapped summit rock
PsammiteAuchivarie Psammite Formation
Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.
Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback →
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 Càrn Dearg on Sunday 27 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Little rain and limited summit cloud on Càrn Dearg: summit wind broadly 10-20 mph, with gusts 20-30 mph at times (a moderate breeze).
Cloud & views
Cloud base around 900–1200 m in the morning, then around 1300–1600 m around midday and 1200–1500 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 disagree markedly on summit wind strength.
Check again nearer the time.
Forecast confidence
Cloud height remains uncertain, especially where it is close to summit level. Keep windproof and warm layers readily available.
Overall confidence is unavailable: insufficient comparable wind, rain guidance.
Cloud-free timing: Around 70% early, improving to around 95% 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.
Morning · 08:00–12:00
ExcellentSummit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground.
88/100
Afternoon · 12:00–17:00
ExcellentSummit winds around 10-20 mph. Gusts around 15-25 mph are possible on exposed ground.
94/100
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 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.9/100Poor · 600 mView detailsHide details
Night beginning Monday 28 September 2026
Full overnight outlook
Exposed camping is not recommended near 600 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 (9/100). Peak gusts range from about 40 mph at 300 m to 50 mph at 600 m. Around 1 mm is forecast, including rain around pack-up. A wet pack-up remains possible from dew or brief dampness toward dawn.
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: 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 m39/100 · poor
Wind / gust
14 mph / 40 mph
Typical / low
7.7°C / 6.8°C · much of the night
In cloud
0% of modelled night
Condensation
Low
600 m9/100 · very poor
Wind / gust
17 mph / 49 mph
Typical / low
7.2°C / 6.8°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.
Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback →
Daytime · exposed rockClimbing & scramblingBetaRock may be damp or still drying.Good74/100View detailsHide details
Generic exposed-rock guidance
Full climbing & scrambling outlook
Conditions for exposed scrambling look fair (74/100). Recent rain may leave seepage and damp rock, especially on shaded sections. The mapped summit rock is Psammite (Auchivarie Psammite Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet.
Rock surfaceDry overhead; seepage uncertainPeak gust23 mphRain0.0 mm
Main concerndamp or incompletely dried rock possible
Mapped summit rock
PsammiteAuchivarie Psammite Formation
Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.
Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback →
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 Càrn Dearg on Monday 28 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Wind40-55 mph southeasterlyGusts65-75 mphFeels like-2 to 2°CPrecipitationAround 5-10 mmCloud-free summit estimate65%Cloud base through day600-3,100 mFreezing levelAbove summitDaylightSunrise 07:17 · Sunset 18:59 · 11.7 hours daylight
The day on the hill
Strong gusts on Càrn Dearg: summit wind broadly 40-55 mph, with gusts 65-75 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 600–900 m in the morning, then around 2800–3100 m around midday and 1100–1400 m by late afternoon. 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.
Cloud may hang lower on southeastern slopes and lift somewhat on the northwestern 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 for much of the day. 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 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.
The strongest gusts could knock you over on exposed ground. 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 30% early, improving to around 90% later.
Sunshine context Model-grid estimate, not summit sunshine
The surrounding model grid indicates 7.4 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.
Morning · 08:00–12:00
Severe hill conditionsSummit winds around 35-50 mph. Gusts around 65-75 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
PoorSummit winds around 45-55 mph in the early afternoon, easing to 40-50 mph later. Gusts around 65-75 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.
4/100
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 and 600 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 mView detailsHide details
Night beginning Tuesday 29 September 2026
Full overnight outlook
Exposed camping is not recommended near 300 and 600 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 50 mph at 300 m to 60 mph at 600 m. Roughly 11.3 mm is forecast overnight, with rain liable to affect both pitching and packing up. Some condensation is possible overnight.
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: 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 m9/100 · very poor
Wind / gust
32 mph / 51 mph
Typical / low
9.4°C / 8.3°C · much of the night
In cloud
0% of modelled night
Condensation
Moderate
600 m9/100 · very poor
Wind / gust
39 mph / 61 mph
Typical / low
9.2°C / 7.8°C · much of the night
In cloud
7% 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.
Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback →
Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 70 mph may affect balance on exposed rock.Poor0/100View 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 Psammite (Auchivarie Psammite Formation). Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Gusts may reach about 70 mph. Crosswinds can make exposed ridges substantially more serious.
Rock surfaceWet rock likelyPeak gust72 mphRain7.0 mm
Main factorsgusts around 70 mphwet rock likely
Mapped summit rock
PsammiteAuchivarie Psammite Formation
Dry quartz-rich bands can be grippy, while mica-rich or foliated sections, lichen and vegetation may become slippery when wet. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.
Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback →
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 Càrn Dearg on Tuesday 29 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
