1,029 m summit in Perthshire Highlands. 8 forecast days covering wind, cloud, rain and temperature, updated 4 November 2026 at 16:25 UTC.
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Confidence: Medium
Overall hill weather82Good
Summit wind · 08:00-17:005-15 mph southeasterlySummit gusts · 08:00-17:0015-25 mphFeels like-6 to -2°CPrecipitationLittle or noneCloud-free summit estimate60%Cloud base through day700-1,600 mFreezing levelAbove summitDaylightSunrise 07:31 · Sunset 16:28 · 8.9 hours daylight
The day on the hill
Dry, with light winds on Càrn Gorm. Cloud could cover the tops and limit the views.
Wind
On the summit expect light winds of up to 15 mph, mainly south-easterly, with gusts of 15–25 mph at the windiest.
Cloud and visibility
There may be clearer spells later, but cloud could still cover the tops. Forecast models differ on how much summit cloud develops. The cloud base could be as low as 700–1000 m mid-morning.
Rain and ground
It should stay dry.
Warmth and kit
On the tops it will be around 0 to 4°C, feeling like -6 to -2°C in the wind. The freezing level is above the summits. Take a hat, gloves, a windproof and a spare warm layer.
Daylight
A short day, with only about 9 hours of daylight. Sunset is around 4:30pm, so allow time to get off the hill before dark, and carry a head torch.
Forecast confidence
Cloud height is hard to pin down, so the summit could be in or out of cloud at short notice. Things could still change through the day, so keep an eye on the sky.
Sunshine context Model-grid estimate, not summit sunshine
The surrounding model grid indicates 5.5 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
GoodSummit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.
74
Afternoon · 12:00–17:00
ExcellentSummit winds around 5-15 mph. Gusts around 15-25 mph are possible on exposed ground.
90
Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaA mixed night to camp, mainly because of damp air: gusts of about 25 mph.59Mixed · 600 mView detailsHide details
Night beginning Wednesday 4 November 2026
Full overnight outlook
A mixed night to camp, mainly because of damp air. Gusts reach about 25 mph on open ground, so peg out well and use the guylines. Look for shelter from the southeast. It should stay dry. Up around 900 m you'd likely be in cloud for part of the night: damp, and hard to find your way if you need to move. The air is damp at every height we checked (300-900 m), so expect heavy condensation. Leave the vents open. A cold night, down to about 2°C around 900 m. A warm 3-season or 3–4 season bag rated to about 0°C comfort, and a warm mat, should do. Allow more if you sleep cold.
Extensive cloud may limit moonlight. Illumination describes the sunlit part of the Moon, not brightness at your pitch.
Overnight window: 4 Nov, 17:00 GMT to 5 Nov, 08:00 GMT. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.
Elevation reference (open ground)
300 m59 · mixed
Wind / gust
9 mph / 19 mph
Typical / low
3.5°C / 3.2°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m59 · mixed
Wind / gust
10 mph / 23 mph
Typical / low
3.5°C / 3.2°C · much of the night
In cloud
0% of modelled night
Condensation
High
900 m52 · mixed
Wind / gust
12 mph / 27 mph
Typical / low
2.1°C / 1.9°C · much of the night
In cloud
93% of modelled night
Condensation
High
Warmth planning: As a broad starting point, consider a warm 3-season or 3–4 season bag with an ISO/EN comfort rating at or below about 0°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.
Good conditions for exposed scrambling. The rock should be mostly dry, though drainage lines and shaded holds may still be damp. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly schist, a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. On the usual routes up you may also cross psammite, which grips well when dry and is fair when wet. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.
Rock surfaceProbably dryPeak gust15-25 mphRain0.0 mm
Representative rock around the summit and along available routes
Calcareous peliteBen Lawers Schist Formation
Origin
Metamorphic
Broad rock-response group
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Summit area
Psammite, pelite or semipelite in 82% of 17 BGS samples within 350 m
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.
Rock groups along the sampled routes
These are mapped rock groups, not separate weather forecasts or a ranking of route safety.
Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
psammite, pelite or semipelite
Geological detail and BGS records
Mapped variation
5 rock types appear in the mapped samples
Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.
Summit-area sample
Calcareous peliteBen Lawers Schist FormationAround 513 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Route sample
Gritty psammiteCarn Mairg Quartzite Formation305–933 m samplesSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Psammite is a hard, sandy rock that has been squeezed and heated. It grips well when dry and is fair when wet. It is generally solid and blocky.
BGS record →
Summit-area sample
Graphitic peliteBen Eagach Schist FormationAround 410 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Summit-area sample
AmphiboliteUnnamed Metamorphosed Igneous Rocks, Pre-Caledonian To Caledonian
Gneiss is a very old, hard, banded rock. It grips very well when dry and stays reasonably grippy when wet. It is usually very solid.
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
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 Gorm on Wednesday 4 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:0015-25 mph easterlySummit gusts · 08:00-17:0025-35 mphFeels like-6 to -2°CPrecipitationUp to around 2 mmCloud-free summit estimate10%Cloud base through day600-900 mFreezing levelAbove summitDaylightSunrise 07:33 · Sunset 16:26 · 8.9 hours daylight
The day on the hill
A mixed day on Càrn Gorm, with the summit in cloud for most of the day.
Wind
On the summit expect an easterly wind of 15–25 mph for most of the day, with gusts of 25–35 mph at the windiest. Lower down on the open hillside it will be more like 5–15 mph. Gusts like that will be noticeable on ridges and open tops, and you will chill quickly when you stop.
Cloud and visibility
Expect the summit to be in cloud for most of the day. The cloud base could be as low as 600–900 m mid-afternoon. In cloud you'll be finding your way without landmarks, so carry navigation you trust and know how to use, with a backup such as a spare battery or a map and compass.
Rain and ground
Drizzle sets in around midday.
Warmth and kit
On the tops it will be around 0 to 4°C, feeling like -6 to -2°C in the wind. The freezing level is above the summits. Take a hat, gloves, a windproof and a spare warm layer.
Daylight
A short day, with only about 9 hours of daylight. Sunset is around 4:25pm, so allow time to get off the hill before dark, and carry a head torch.
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.
49
Afternoon · 12:00–17:00
MixedSummit winds around 15-25 mph. Gusts around 25-35 mph are possible on exposed ground. Rain is forecast during this period.
53
Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaA mixed night to camp, mainly because of damp air: gusts of about 30 mph.59Mixed · 600 mView detailsHide details
Night beginning Thursday 5 November 2026
Full overnight outlook
A mixed night to camp, mainly because of damp air. Gusts reach about 30 mph on open ground, so peg out well and use the guylines. Look for shelter from the southeast. It should stay dry. Up around 900 m you'd likely be in cloud for part of the night: damp, and hard to find your way if you need to move. The air is damp at every height we checked (300-900 m), so expect heavy condensation. Leave the vents open. A cold night, down to about 2°C around 900 m. A warm 3-season or 3–4 season bag rated to about 0°C comfort, and a warm mat, should do. Allow more if you sleep cold.
Extensive cloud may limit moonlight. Illumination describes the sunlit part of the Moon, not brightness at your pitch.
Overnight window: 5 Nov, 17:00 GMT to 6 Nov, 08:00 GMT. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.
Elevation reference (open ground)
300 m59 · mixed
Wind / gust
13 mph / 21 mph
Typical / low
3.8°C / 3.6°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m59 · mixed
Wind / gust
16 mph / 25 mph
Typical / low
3.8°C / 3.6°C · much of the night
In cloud
0% of modelled night
Condensation
High
900 m50 · mixed
Wind / gust
19 mph / 29 mph
Typical / low
2.3°C / 2.2°C · much of the night
In cloud
100% of modelled night
Condensation
High
Warmth planning: As a broad starting point, consider a warm 3-season or 3–4 season bag with an ISO/EN comfort rating at or below about 0°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.
Very poor conditions for exposed scrambling. The rock is likely to be wet and slippery through the day. Gusts of 25–35 mph could throw you off balance on exposed moves and ridges. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly schist, a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. On the usual routes up you may also cross psammite, which grips well when dry and is fair when wet. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.
Rock surfaceWet rock likelyPeak gust25-35 mphRain0.7 mm
Main factorswet rock likelymuch of the route may be in cloud
Representative rock around the summit and along available routes
Calcareous peliteBen Lawers Schist Formation
Origin
Metamorphic
Broad rock-response group
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Summit area
Psammite, pelite or semipelite in 82% of 17 BGS samples within 350 m
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.
Rock groups along the sampled routes
These are mapped rock groups, not separate weather forecasts or a ranking of route safety.
Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
psammite, pelite or semipelite
Geological detail and BGS records
Mapped variation
5 rock types appear in the mapped samples
Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.
Summit-area sample
Calcareous peliteBen Lawers Schist FormationAround 513 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Route sample
Gritty psammiteCarn Mairg Quartzite Formation305–933 m samplesSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Psammite is a hard, sandy rock that has been squeezed and heated. It grips well when dry and is fair when wet. It is generally solid and blocky.
BGS record →
Summit-area sample
Graphitic peliteBen Eagach Schist FormationAround 410 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Summit-area sample
AmphiboliteUnnamed Metamorphosed Igneous Rocks, Pre-Caledonian To Caledonian
Gneiss is a very old, hard, banded rock. It grips very well when dry and stays reasonably grippy when wet. It is usually very solid.
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
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 Gorm on Thursday 5 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:005-25 mph southeasterlySummit gusts · 08:00-17:0020-30 mphFeels like-6 to -2°CPrecipitationUp to around 2 mmCloud-free summit estimate10%Cloud base through day600-900 mFreezing levelAbove summitDaylightSunrise 07:36 · Sunset 16:24 · 8.8 hours daylight
The day on the hill
A mixed day on Càrn Gorm, with the summit in cloud for most of the day.
Wind
On the summit expect a south-easterly wind of 5–25 mph for most of the day, with gusts of 20–30 mph at the windiest. Lower down on the open hillside it will be more like 5–15 mph.
Cloud and visibility
Expect the summit to be in cloud for most of the day. The cloud base could be as low as 600–900 m mid-afternoon. In cloud you'll be finding your way without landmarks, so carry navigation you trust and know how to use, with a backup such as a spare battery or a map and compass.
Rain and ground
Drizzle sets in mid-morning.
Warmth and kit
On the tops it will be around 0 to 4°C, feeling like -6 to -2°C in the wind. The freezing level is above the summits. Take a hat, gloves, a windproof and a spare warm layer.
Daylight
A short day, with only about 9 hours of daylight. Sunset is around 4:25pm, so allow time to get off the hill before dark, and carry a head torch.
Forecast confidence
It's still two days off, so check again nearer the time.
Sunshine context Model-grid estimate, not summit sunshine
The surrounding model grid indicates Less than 1 hour 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
MixedSummit winds around 15-25 mph. Gusts around 20-30 mph are possible on exposed ground. Rain is forecast during this period.
52
Afternoon · 12:00–17:00
MixedSummit winds around 5-20 mph. Gusts around 20-30 mph are possible on exposed ground. Rain is forecast during this period.
63
Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaA mixed night to camp, mainly because of the rain: gusts of about 15 mph.59Mixed · 600 mView detailsHide details
Night beginning Friday 6 November 2026
Full overnight outlook
A mixed night to camp, mainly because of the rain. Light winds on open ground, gusting no more than about 15 mph. Expect some light rain, with rain while you pitch and still falling when you pack up. Up around 900 m you'd likely be in cloud for part of the night: damp, and hard to find your way if you need to move. The air is damp at every height we checked (300-900 m), so expect heavy condensation. Leave the vents open. A cold night, down to about 2°C around 900 m. A warm 3-season or 3–4 season bag rated to about 0°C comfort, and a warm mat, should do. Allow more if you sleep cold.
Cloud may affect views of the Moon. Illumination describes the sunlit part of the Moon, not brightness at your pitch.
Overnight window: 6 Nov, 17:00 GMT to 7 Nov, 08:00 GMT. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.
Elevation reference (open ground)
300 m59 · mixed
Wind / gust
8 mph / 11 mph
Typical / low
4.0°C / 3.9°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m59 · mixed
Wind / gust
9 mph / 13 mph
Typical / low
4.0°C / 3.9°C · much of the night
In cloud
0% of modelled night
Condensation
High
900 m53 · mixed
Wind / gust
11 mph / 15 mph
Typical / low
2.5°C / 2.3°C · much of the night
In cloud
100% of modelled night
Condensation
High
Warmth planning: As a broad starting point, consider a warm 3-season or 3–4 season bag with an ISO/EN comfort rating at or below about 0°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.
Poor conditions for exposed scrambling. The rock is likely to be wet and slippery through the day. Gusts of 20–30 mph will be noticeable on exposed ridges. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly schist, a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. On the usual routes up you may also cross psammite, which grips well when dry and is fair when wet. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.
Rock surfaceWet rock likelyPeak gust20-30 mphRain1.2 mm
Main factorswet rock likelymuch of the route may be in cloud
Representative rock around the summit and along available routes
Calcareous peliteBen Lawers Schist Formation
Origin
Metamorphic
Broad rock-response group
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Summit area
Psammite, pelite or semipelite in 82% of 17 BGS samples within 350 m
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.
Rock groups along the sampled routes
These are mapped rock groups, not separate weather forecasts or a ranking of route safety.
Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
psammite, pelite or semipelite
Geological detail and BGS records
Mapped variation
5 rock types appear in the mapped samples
Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.
Summit-area sample
Calcareous peliteBen Lawers Schist FormationAround 513 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Route sample
Gritty psammiteCarn Mairg Quartzite Formation305–933 m samplesSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Psammite is a hard, sandy rock that has been squeezed and heated. It grips well when dry and is fair when wet. It is generally solid and blocky.
BGS record →
Summit-area sample
Graphitic peliteBen Eagach Schist FormationAround 410 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Summit-area sample
AmphiboliteUnnamed Metamorphosed Igneous Rocks, Pre-Caledonian To Caledonian
Gneiss is a very old, hard, banded rock. It grips very well when dry and stays reasonably grippy when wet. It is usually very solid.
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
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 Gorm on Friday 6 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
A mixed day on Càrn Gorm, with the summit in cloud for most of the day and drizzle for much of the day.
Wind
On the summit expect light winds of up to 15 mph, mainly easterly, with gusts of 15–25 mph at the windiest. Lower down on the open hillside the wind will be light, under 10 mph.
Cloud and visibility
Expect the summit to be in cloud for most of the day. The cloud base could be as low as 600–900 m mid-afternoon. In cloud you'll be finding your way without landmarks, so carry navigation you trust and know how to use, with a backup such as a spare battery or a map and compass.
Rain and ground
Drizzle for much of the day. Expect 2–5 mm in total. Most other forecast models keep it much drier than this.
Warmth and kit
On the tops it will be around 0 to 4°C, feeling like -4 to 0°C in the wind. The freezing level is close to summit height. Take a hat, gloves, a windproof and a spare warm layer. Pack waterproofs too, and keep a warm layer dry in your pack.
Daylight
A short day, with only about 9 hours of daylight. Sunset is around 4:20pm, so allow time to get off the hill before dark, and carry a head torch.
Forecast confidence
Cloud height is hard to pin down, so the summit could be in or out of cloud at short notice. It's still three days off and could change, so check again nearer the time.
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
MixedSummit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Rain is forecast during this period.
64
Afternoon · 12:00–17:00
MixedSummit winds around 10-20 mph. Gusts around 15-25 mph are possible on exposed ground. Rain is forecast during this period.
62
Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaA mixed night to camp, mainly because of the rain: gusts of about 20 mph.54Mixed · 600 mView detailsHide details
Night beginning Saturday 7 November 2026
Full overnight outlook
A mixed night to camp, mainly because of the rain. Light winds on open ground, gusting no more than about 20 mph. Expect some light rain, with rain while you pitch and still falling when you pack up. Above about 600 m you'd likely be in cloud for part of the night: damp, and hard to find your way if you need to move. The air is damp at every height we checked (300-900 m), so expect heavy condensation. Leave the vents open. A cold night, down to about 2°C around 900 m. A warm 3-season or 3–4 season bag rated to about 0°C comfort, and a warm mat, should do. Allow more if you sleep cold.
Warmth planning: As a broad starting point, consider a warm 3-season or 3–4 season bag with an ISO/EN comfort rating at or below about 0°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.
Poor conditions for exposed scrambling. The rock is likely to be wet and slippery through the day. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly schist, a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. On the usual routes up you may also cross psammite, which grips well when dry and is fair when wet. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.
Rock surfaceWet rock likelyPeak gust15-25 mphRain3.4 mm
Main factorswet rock likelymuch of the route may be in cloud
Representative rock around the summit and along available routes
Calcareous peliteBen Lawers Schist Formation
Origin
Metamorphic
Broad rock-response group
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Summit area
Psammite, pelite or semipelite in 82% of 17 BGS samples within 350 m
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.
Rock groups along the sampled routes
These are mapped rock groups, not separate weather forecasts or a ranking of route safety.
Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
psammite, pelite or semipelite
Geological detail and BGS records
Mapped variation
5 rock types appear in the mapped samples
Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.
Summit-area sample
Calcareous peliteBen Lawers Schist FormationAround 513 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Route sample
Gritty psammiteCarn Mairg Quartzite Formation305–933 m samplesSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Psammite is a hard, sandy rock that has been squeezed and heated. It grips well when dry and is fair when wet. It is generally solid and blocky.
BGS record →
Summit-area sample
Graphitic peliteBen Eagach Schist FormationAround 410 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Summit-area sample
AmphiboliteUnnamed Metamorphosed Igneous Rocks, Pre-Caledonian To Caledonian
Gneiss is a very old, hard, banded rock. It grips very well when dry and stays reasonably grippy when wet. It is usually very solid.
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
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 Gorm on Saturday 7 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:000-10 mph northerlySummit gusts · 08:00-17:005-15 mphFeels like-4 to 0°CPrecipitationUp to around 2 mmCloud-free summit estimate30%Cloud base through day500-1,600 mFreezing level1,000-1,300 mDaylightSunrise 07:40 · Sunset 16:19 · 8.7 hours daylight
The day on the hill
A mixed day on Càrn Gorm, with sleet or snow on the tops and cloud coming and going on the summit.
Snow and navigation
Sleet or snow is possible on the tops in the morning, with small temperature changes affecting the mix. The air freezing level is roughly 1100 to 1200 m above sea level. Snow can fall below this, but its lower limit is uncertain.
Wind
On the summit expect light winds of up to 10 mph, mainly northerly, with gusts of 5–15 mph at the windiest.
Cloud and visibility
Expect the summit to be in cloud for most of the day. The cloud base could be as low as 500–800 m early in the morning. In cloud you'll be finding your way without landmarks, so carry navigation you trust and know how to use, with a backup such as a spare battery or a map and compass. Mist or fog is possible in the valleys early on, clearing by about 8am.
Rain and ground
Sleet is possible on the tops, and it could turn to snow if it is a little colder. Spells of drizzle, mostly mid-morning. Expect up to 2 mm in total, measured as melted water, so any snow would lie deeper.
Warmth and kit
On the tops it will be around 0 to 4°C, feeling like -4 to 0°C in the wind. The freezing level is close to summit height. Take a hat, gloves, a windproof and a spare warm layer. Pack waterproofs too, and keep a warm layer dry in your pack.
Daylight
A short day, with only about 9 hours of daylight. Sunset is around 4:20pm, so allow time to get off the hill before dark, and carry a head torch.
Forecast confidence
Cloud heights are particularly hard to pin down today. It's still four days off and could change, so check again nearer the time.
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
MixedSummit winds around 0-10 mph. Gusts around 0-10 mph are possible on exposed ground. Rain is forecast during this period.
59
Afternoon · 12:00–17:00
GoodSummit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.
78
Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaA mixed night to camp, mainly because of damp air: dry, with light winds.59Mixed · 600 mView detailsHide details
Night beginning Sunday 8 November 2026
Full overnight outlook
A mixed night to camp, mainly because of damp air. Light winds on open ground, gusting no more than about 15 mph. It should stay dry. Up around 900 m you'd likely be in cloud for part of the night: damp, and hard to find your way if you need to move. The air is damp up around 900 m, so expect heavy condensation. Leave the vents open. A cold night, down to about 1°C around 900 m. A warm 3-season or 3–4 season bag rated to about 0°C comfort, and a warm mat, should do. Allow more if you sleep cold.
Warmth planning: As a broad starting point, consider a warm 3-season or 3–4 season bag with an ISO/EN comfort rating at or below about 0°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.
Mixed conditions for exposed scrambling. The rock is likely to be wet and slippery through the day. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly schist, a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. On the usual routes up you may also cross psammite, which grips well when dry and is fair when wet. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.
Rock surfaceWet rock likelyPeak gust5-15 mphRain0.4 mm
Main factorswet rock likelymuch of the route may be in cloud
Representative rock around the summit and along available routes
Calcareous peliteBen Lawers Schist Formation
Origin
Metamorphic
Broad rock-response group
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Summit area
Psammite, pelite or semipelite in 82% of 17 BGS samples within 350 m
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.
Rock groups along the sampled routes
These are mapped rock groups, not separate weather forecasts or a ranking of route safety.
Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
psammite, pelite or semipelite
Geological detail and BGS records
Mapped variation
5 rock types appear in the mapped samples
Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.
Summit-area sample
Calcareous peliteBen Lawers Schist FormationAround 513 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Route sample
Gritty psammiteCarn Mairg Quartzite Formation305–933 m samplesSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Psammite is a hard, sandy rock that has been squeezed and heated. It grips well when dry and is fair when wet. It is generally solid and blocky.
BGS record →
Summit-area sample
Graphitic peliteBen Eagach Schist FormationAround 410 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Summit-area sample
AmphiboliteUnnamed Metamorphosed Igneous Rocks, Pre-Caledonian To Caledonian
Gneiss is a very old, hard, banded rock. It grips very well when dry and stays reasonably grippy when wet. It is usually very solid.
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
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 Gorm on Sunday 8 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:000-10 mph northwesterlySummit gusts · 08:00-17:005-15 mphFeels like-4 to 0°CPrecipitationLittle or noneCloud-free summit estimate60%Cloud base through day500-1,600 mFreezing level900-1,200 mDaylightSunrise 07:42 · Sunset 16:17 · 8.6 hours daylight
The day on the hill
A good day on Càrn Gorm: dry, with light winds.
Wind
On the summit expect light winds of up to 10 mph, mainly north-westerly, with gusts of 5–15 mph at the windiest.
Cloud and visibility
Cloud on the tops early should lift off them by mid-morning. The cloud base could be as low as 500–800 m early in the morning. Mist or fog is possible in the valleys early on, clearing by about 7am.
Rain and ground
It should stay dry.
Warmth and kit
On the tops it will be around 0 to 4°C, feeling like -4 to 0°C in the wind. The freezing level is close to summit height. Take a hat, gloves, a windproof and a spare warm layer.
Daylight
A short day, with only about 9 hours of daylight. Sunset is around 4:15pm, so allow time to get off the hill before dark, and carry a head torch.
Forecast confidence
Cloud heights are particularly hard to pin down today. It's still five days off and could change, so check again nearer the time.
Sunshine context Model-grid estimate, not summit sunshine
The surrounding model grid indicates 3.6 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.
Morning · 08:00–12:00
GoodSummit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.
74
Afternoon · 12:00–17:00
ExcellentSummit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground.
90
Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaA mixed night to camp, mainly because of damp air: dry, with light winds.59Mixed · 600 mView detailsHide details
Night beginning Monday 9 November 2026
Full overnight outlook
A mixed night to camp, mainly because of damp air. Light winds on open ground, gusting no more than about 9 mph. It should stay dry. Up around 900 m you'd likely be in cloud for part of the night: damp, and hard to find your way if you need to move. The air is damp up around 900 m, so expect heavy condensation. Leave the vents open. A cold night, down to about 2°C around 900 m. A warm 3-season or 3–4 season bag rated to about 0°C comfort, and a warm mat, should do. Allow more if you sleep cold.
Warmth planning: As a broad starting point, consider a warm 3-season or 3–4 season bag with an ISO/EN comfort rating at or below about 0°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.
Good conditions for exposed scrambling. The rock should be mostly dry, though drainage lines and shaded holds may still be damp. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly schist, a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. On the usual routes up you may also cross psammite, which grips well when dry and is fair when wet. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.
Rock surfaceProbably dryPeak gust5-15 mphRain0.0 mm
Representative rock around the summit and along available routes
Calcareous peliteBen Lawers Schist Formation
Origin
Metamorphic
Broad rock-response group
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Summit area
Psammite, pelite or semipelite in 82% of 17 BGS samples within 350 m
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.
Rock groups along the sampled routes
These are mapped rock groups, not separate weather forecasts or a ranking of route safety.
Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
psammite, pelite or semipelite
Geological detail and BGS records
Mapped variation
5 rock types appear in the mapped samples
Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.
Summit-area sample
Calcareous peliteBen Lawers Schist FormationAround 513 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Route sample
Gritty psammiteCarn Mairg Quartzite Formation305–933 m samplesSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Psammite is a hard, sandy rock that has been squeezed and heated. It grips well when dry and is fair when wet. It is generally solid and blocky.
BGS record →
Summit-area sample
Graphitic peliteBen Eagach Schist FormationAround 410 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Summit-area sample
AmphiboliteUnnamed Metamorphosed Igneous Rocks, Pre-Caledonian To Caledonian
Gneiss is a very old, hard, banded rock. It grips very well when dry and stays reasonably grippy when wet. It is usually very solid.
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
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 Gorm on Monday 9 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:000-15 mph northerlySummit gusts · 08:00-17:0010-20 mphFeels like-6 to -2°CPrecipitationLittle or noneCloud-free summit estimate50%Cloud base through day700-1,500 mFreezing level900-1,200 mDaylightSunrise 07:44 · Sunset 16:15 · 8.5 hours daylight
The day on the hill
A good day on Càrn Gorm: dry, with light winds.
Wind
On the summit expect light winds of up to 15 mph, mainly northerly, with gusts of 10–20 mph at the windiest. Lower down on the open hillside the wind will be light, under 5 mph.
Cloud and visibility
The tops are likely to drift in and out of cloud, with the best chance of a clear summit in the early afternoon. The cloud base could be as low as 700–1000 m mid-morning. A few forecast models bring it lower still, to around 500–800 m. Mist or fog is possible in the valleys early on, clearing by about 7am.
Rain and ground
It should stay dry.
Warmth and kit
On the tops it will be around -2 to 2°C, feeling like -6 to -2°C in the wind. The freezing level is close to summit height. Take a hat, gloves, a windproof and a spare warm layer.
Daylight
A short day, with only about 9 hours of daylight. Sunset is around 4:15pm, so allow time to get off the hill before dark, and carry a head torch.
Forecast confidence
It's still six days off and could change, so check again nearer the time.
Sunshine context Model-grid estimate, not summit sunshine
The surrounding model grid indicates 6.8 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.
Morning · 08:00–12:00
GoodSummit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground. Summit cloud becomes more persistent later.
73
Afternoon · 12:00–17:00
GoodSummit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.
84
Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaA mixed night to camp, mainly because of the cold: a frost, down to 0°C.59Mixed · 600 mView detailsHide details
Night beginning Tuesday 10 November 2026
Full overnight outlook
A mixed night to camp, mainly because of the cold. Light winds on open ground, gusting no more than about 20 mph. The wind swings from northerly to easterly overnight, so a pitch sheltered at dusk may not be by morning. It should stay dry. Up around 900 m you'd likely be in cloud for part of the night: damp, and hard to find your way if you need to move. A frost up around 900 m, down to about 0°C. A warm 3-season or 3–4 season bag rated to about -2°C comfort, and a warm mat, should do. Allow more if you sleep cold.
Warmth planning: As a broad starting point, consider a warm 3-season or 3–4 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.
Good conditions for exposed scrambling. The rock should be mostly dry, though drainage lines and shaded holds may still be damp. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly schist, a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. On the usual routes up you may also cross psammite, which grips well when dry and is fair when wet. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.
Rock surfaceProbably dryPeak gust10-20 mphRain0.0 mm
Representative rock around the summit and along available routes
Calcareous peliteBen Lawers Schist Formation
Origin
Metamorphic
Broad rock-response group
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Summit area
Psammite, pelite or semipelite in 82% of 17 BGS samples within 350 m
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.
Rock groups along the sampled routes
These are mapped rock groups, not separate weather forecasts or a ranking of route safety.
Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
psammite, pelite or semipelite
Geological detail and BGS records
Mapped variation
5 rock types appear in the mapped samples
Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.
Summit-area sample
Calcareous peliteBen Lawers Schist FormationAround 513 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Route sample
Gritty psammiteCarn Mairg Quartzite Formation305–933 m samplesSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Psammite is a hard, sandy rock that has been squeezed and heated. It grips well when dry and is fair when wet. It is generally solid and blocky.
BGS record →
Summit-area sample
Graphitic peliteBen Eagach Schist FormationAround 410 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Summit-area sample
AmphiboliteUnnamed Metamorphosed Igneous Rocks, Pre-Caledonian To Caledonian
Gneiss is a very old, hard, banded rock. It grips very well when dry and stays reasonably grippy when wet. It is usually very solid.
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
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 Gorm on Tuesday 10 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:0010-20 mph easterlySummit gusts · 08:00-17:0020-30 mphFeels like-10 to -6°CPrecipitationLittle or noneCloud-free summit estimate35%Cloud base through day700-1,500 mFreezing level800-1,100 mDaylightSunrise 07:46 · Sunset 16:13 · 8.4 hours daylight
The day on the hill
A mixed day on Càrn Gorm, with cloud coming and going on the summit.
Wind
On the summit expect an easterly wind of 10–20 mph for most of the day, with gusts of 20–30 mph at the windiest. Lower down on the open hillside the wind will be light, under 10 mph.
Cloud and visibility
Expect the summit to be in cloud for most of the day. The cloud base could be as low as 700–1000 m early in the morning. In cloud you'll be finding your way without landmarks, so carry navigation you trust and know how to use, with a backup such as a spare battery or a map and compass. Mist or fog is possible in the valleys early on, clearing by about 8am.
Rain and ground
It should stay dry.
Warmth and kit
On the tops it will be around -2 to 2°C, feeling like -10 to -6°C in the wind. The freezing level is close to summit height. Take a hat, gloves, a windproof and a spare warm layer.
Daylight
A short day, with only about 8 hours of daylight. Sunset is around 4:15pm, so allow time to get off the hill before dark, and carry a head torch.
Forecast confidence
It's still seven days off and could change, so check again nearer the time.
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
MixedSummit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground.
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Afternoon · 12:00–17:00
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.
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Compare an early start with later conditions. The main forecast above covers the day in more detail.
Overnight · 17:00–08:00Wild campingBetaA poor night to camp on open ground: a frost, down to -2°C.39Poor · 600 mView detailsHide details
Night beginning Wednesday 11 November 2026
Full overnight outlook
A poor night to camp on open ground. Light winds on open ground, gusting no more than about 15 mph. It should stay dry. A frost at every height we checked (300-900 m), down to about -2°C. A warm 3-season or 3–4 season bag rated to about -4°C comfort, and a warm mat, should do. Allow more if you sleep cold.
Warmth planning: As a broad starting point, consider a warm 3-season or 3–4 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.
Mixed conditions for exposed scrambling. The rock should be mostly dry, though drainage lines and shaded holds may still be damp. Gusts of 20–30 mph will be noticeable on exposed ridges. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly schist, a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. On the usual routes up you may also cross psammite, which grips well when dry and is fair when wet. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.
Rock surfaceProbably dryPeak gust20-30 mphRain0.0 mm
Main concernmuch of the route may be in cloud
Representative rock around the summit and along available routes
Calcareous peliteBen Lawers Schist Formation
Origin
Metamorphic
Broad rock-response group
Psammite, pelite or semipelite
Mapping
BGS Geology 50K · 1:50,000
Summit area
Psammite, pelite or semipelite in 82% of 17 BGS samples within 350 m
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.
Rock groups along the sampled routes
These are mapped rock groups, not separate weather forecasts or a ranking of route safety.
Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
psammite, pelite or semipelite
Geological detail and BGS records
Mapped variation
5 rock types appear in the mapped samples
Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.
Summit-area sample
Calcareous peliteBen Lawers Schist FormationAround 513 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Route sample
Gritty psammiteCarn Mairg Quartzite Formation305–933 m samplesSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Psammite is a hard, sandy rock that has been squeezed and heated. It grips well when dry and is fair when wet. It is generally solid and blocky.
BGS record →
Summit-area sample
Graphitic peliteBen Eagach Schist FormationAround 410 mSeen on Càrn Gorm, Meall Garbh (Càrn Mairg), Càrn Mairg and Creag Mhòr (Meall na Aighean)
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
BGS record →
Summit-area sample
AmphiboliteUnnamed Metamorphosed Igneous Rocks, Pre-Caledonian To Caledonian
Gneiss is a very old, hard, banded rock. It grips very well when dry and stays reasonably grippy when wet. It is usually very solid.
Schist is a flaky, mica-rich rock that splits into layers. It has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. It splits easily along its layers, so flakes and ledges can be loose, and it is often grassy and vegetated.
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.
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This is about Càrn Gorm on Wednesday 11 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
