946 m summit in Cairngorms. 8 forecast days covering wind, cloud, rain and temperature, updated 4 November 2026 at 16:25 UTC.
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Confidence: High
Overall hill weather90Excellent
Summit wind · 08:00-17:000-15 mph easterlySummit gusts · 08:00-17:0010-20 mphFeels like-4 to 0°CPrecipitationLittle or noneCloud-free summit estimate90%Cloud base through day700-1,500 mFreezing levelAbove summitDaylightSunrise 07:30 · Sunset 16:24 · 8.9 hours daylight
The day on the hill
A fine day on Càrn Bhac: dry, with light winds and clear tops for most of the day.
Wind
On the summit expect light winds of up to 15 mph, mainly easterly, with gusts of 10–20 mph at the windiest.
Cloud and visibility
The tops should stay mostly clear of cloud. A few forecast models bring the cloud base down to around 700–1000 m at times. Mist or fog is possible in the valleys early on, clearing by about 9am. The air should be clear, so expect far-reaching views as long as the tops stay clear.
Rain and ground
It should stay dry.
Warmth and kit
On the tops it will be around -2 to 2°C, feeling like -4 to 0°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 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
ExcellentSummit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground.
90
Afternoon · 12:00–17:00
ExcellentSummit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground. Summit cloud becomes more persistent later.
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 Wednesday 4 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 20 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 at every height we checked (300-900 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.
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 / 14 mph
Typical / low
3.6°C / 3.4°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m59 · mixed
Wind / gust
10 mph / 16 mph
Typical / low
3.6°C / 3.4°C · much of the night
In cloud
0% of modelled night
Condensation
High
900 m54 · mixed
Wind / gust
12 mph / 19 mph
Typical / low
2.4°C / 0.9°C · much of the night
In cloud
73% 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 quartzite, a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. On the usual routes up you may also cross schist, which has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. 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
QuartziteAn Socach Quartzite Formation
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. 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 Bhac and Beinn Iutharn Mhòr
quartzite, psammite, pelite or semipelite, granite, gneiss or gabbro
Geological detail and BGS records
Mapped variation
4 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
QuartziteAn Socach Quartzite Formation693–865 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands.
BGS record →
Route sample
PeliteSron Nan Dias Pelite And Limestone Formation520–598 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
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
LamprophyreNorth Britain Siluro-Devonian Calc-Alkaline Dyke SuiteAround 955 mSeen on Càrn Bhac and Beinn Iutharn Mhòr
Lamprophyre is a dark rock that usually forms thin dykes. It grips reasonably when dry and is poor when wet. It weathers easily and is often crumbly and loose, so treat it with suspicion.
BGS record →
Summit-area sample
Metadolostone and calcsilicate-rockBaddoch Burn Limestone Member
Limestone is a pale sedimentary rock. It grips well where it is rough, but polished limestone is glassy and is very slippery when wet. It is generally solid, though cracked and fissured along its edges.
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 Bhac on Wednesday 4 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:005-15 mph easterlySummit gusts · 08:00-17:0010-20 mphFeels like-6 to -2°CPrecipitationUp to around 2 mmCloud-free summit estimate10%Cloud base through day700-1,000 mFreezing levelAbove summitDaylightSunrise 07:32 · Sunset 16:22 · 8.8 hours daylight
The day on the hill
A mixed day on Càrn Bhac, with the summit in cloud for most of the day.
Wind
On the summit expect light winds of up to 15 mph, mainly easterly, with gusts of 10–20 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. Mist or fog is possible in the valleys early on, clearing by about 10am.
Rain and ground
Drizzle at first, clearing by early afternoon.
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 4:20pm, 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
MixedSummit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Rain is forecast during this period.
56
Afternoon · 12:00–17:00
MixedSummit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Rain is forecast during this period.
59
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 25 mph.59Mixed · 600 mView detailsHide details
Night beginning Thursday 5 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 25 mph. Dry to pitch, then some light rain overnight, easing by morning, though the tent may still be wet. 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
8 mph / 17 mph
Typical / low
4.1°C / 3.5°C · much of the night
In cloud
0% of modelled night
Condensation
High
600 m59 · mixed
Wind / gust
10 mph / 20 mph
Typical / low
4.1°C / 3.5°C · much of the night
In cloud
0% of modelled night
Condensation
High
900 m50 · mixed
Wind / gust
11 mph / 24 mph
Typical / low
2.6°C / 2.1°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. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly quartzite, a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. On the usual routes up you may also cross schist, which has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. 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 gust10-20 mphRain0.5 mm
Main factorswet rock likelymuch of the route may be in cloud
Representative rock around the summit and along available routes
QuartziteAn Socach Quartzite Formation
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. 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 Bhac and Beinn Iutharn Mhòr
quartzite, psammite, pelite or semipelite, granite, gneiss or gabbro
Geological detail and BGS records
Mapped variation
4 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
QuartziteAn Socach Quartzite Formation693–865 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands.
BGS record →
Route sample
PeliteSron Nan Dias Pelite And Limestone Formation520–598 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
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
LamprophyreNorth Britain Siluro-Devonian Calc-Alkaline Dyke SuiteAround 955 mSeen on Càrn Bhac and Beinn Iutharn Mhòr
Lamprophyre is a dark rock that usually forms thin dykes. It grips reasonably when dry and is poor when wet. It weathers easily and is often crumbly and loose, so treat it with suspicion.
BGS record →
Summit-area sample
Metadolostone and calcsilicate-rockBaddoch Burn Limestone Member
Limestone is a pale sedimentary rock. It grips well where it is rough, but polished limestone is glassy and is very slippery when wet. It is generally solid, though cracked and fissured along its edges.
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 Bhac on Thursday 5 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:005-15 mph easterlySummit gusts · 08:00-17:0010-20 mphFeels like-4 to 0°CPrecipitationUp to around 2 mmCloud-free summit estimate25%Cloud base through day600-1,300 mFreezing levelAbove summitDaylightSunrise 07:34 · Sunset 16:20 · 8.8 hours daylight
The day on the hill
A good day on Càrn Bhac, though expect cloud on the tops early.
Wind
On the summit expect light winds of up to 15 mph, mainly easterly, with gusts of 10–20 mph at the windiest.
Cloud and visibility
Cloud on the tops early should lift off them by early afternoon. The cloud base could be as low as 600–900 m mid-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 9am.
Rain and ground
Drizzle at first, clearing by mid-morning.
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 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 4:20pm, 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 two days off and could change, 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 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Rain is forecast during this period.
62
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.
83
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 Friday 6 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 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 / 12 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 / 14 mph
Typical / low
4.0°C / 3.9°C · much of the night
In cloud
0% of modelled night
Condensation
High
900 m54 · mixed
Wind / gust
11 mph / 17 mph
Typical / low
2.1°C / 1.7°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.
Mixed conditions for exposed scrambling. The rock should be drying, but damp patches, shaded holds and drainage lines may still be wet. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly quartzite, a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. On the usual routes up you may also cross schist, which has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.
Rock surfaceDamp or dryingPeak gust10-20 mphRain0.2 mm
Main factorsdamp or incompletely dried rock possiblemuch of the route may be in cloud
Representative rock around the summit and along available routes
QuartziteAn Socach Quartzite Formation
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. 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 Bhac and Beinn Iutharn Mhòr
quartzite, psammite, pelite or semipelite, granite, gneiss or gabbro
Geological detail and BGS records
Mapped variation
4 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
QuartziteAn Socach Quartzite Formation693–865 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands.
BGS record →
Route sample
PeliteSron Nan Dias Pelite And Limestone Formation520–598 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
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
LamprophyreNorth Britain Siluro-Devonian Calc-Alkaline Dyke SuiteAround 955 mSeen on Càrn Bhac and Beinn Iutharn Mhòr
Lamprophyre is a dark rock that usually forms thin dykes. It grips reasonably when dry and is poor when wet. It weathers easily and is often crumbly and loose, so treat it with suspicion.
BGS record →
Summit-area sample
Metadolostone and calcsilicate-rockBaddoch Burn Limestone Member
Limestone is a pale sedimentary rock. It grips well where it is rough, but polished limestone is glassy and is very slippery when wet. It is generally solid, though cracked and fissured along its edges.
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 Bhac on Friday 6 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:005-15 mph easterlySummit gusts · 08:00-17:0010-20 mphFeels like-4 to 0°CPrecipitationUp to around 2 mmCloud-free summit estimate10%Cloud base through day600-900 mFreezing levelAbove summitDaylightSunrise 07:36 · Sunset 16:18 · 8.7 hours daylight
The day on the hill
A mixed day on Càrn Bhac, with the summit in cloud for most of the day.
Wind
On the summit expect light winds of up to 15 mph, mainly easterly, with gusts of 10–20 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 600–900 m in the early 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
A little rain at times.
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 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 4:20pm, 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.
66
Afternoon · 12:00–17:00
MixedSummit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Rain is forecast during this period.
66
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.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 15 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. A cold night, down to about 2°C around 900 m. A 3-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 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.
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 quartzite, a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. On the usual routes up you may also cross schist, which has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. 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 gust10-20 mphRain0.5 mm
Main factorswet rock likelymuch of the route may be in cloud
Representative rock around the summit and along available routes
QuartziteAn Socach Quartzite Formation
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. 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 Bhac and Beinn Iutharn Mhòr
quartzite, psammite, pelite or semipelite, granite, gneiss or gabbro
Geological detail and BGS records
Mapped variation
4 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
QuartziteAn Socach Quartzite Formation693–865 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands.
BGS record →
Route sample
PeliteSron Nan Dias Pelite And Limestone Formation520–598 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
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
LamprophyreNorth Britain Siluro-Devonian Calc-Alkaline Dyke SuiteAround 955 mSeen on Càrn Bhac and Beinn Iutharn Mhòr
Lamprophyre is a dark rock that usually forms thin dykes. It grips reasonably when dry and is poor when wet. It weathers easily and is often crumbly and loose, so treat it with suspicion.
BGS record →
Summit-area sample
Metadolostone and calcsilicate-rockBaddoch Burn Limestone Member
Limestone is a pale sedimentary rock. It grips well where it is rough, but polished limestone is glassy and is very slippery when wet. It is generally solid, though cracked and fissured along its edges.
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 Bhac 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 northwesterlySummit gusts · 08:00-17:005-15 mphFeels like-2 to 2°CPrecipitationUp to around 2 mmCloud-free summit estimate45%Cloud base through day500-1,200 mFreezing levelAbove summitDaylightSunrise 07:39 · Sunset 16:15 · 8.6 hours daylight
The day on the hill
A good day on Càrn Bhac, though expect cloud on the tops early.
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 midday. The cloud base could be as low as 500–800 m early in the morning. Mist or fog is possible in the valleys during the morning, clearing by about 9am.
Rain and ground
Spells of drizzle through the day.
Warmth and kit
On the tops it will be around 0 to 4°C, feeling like -2 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 4:15pm, 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 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 1.4 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.
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 0-10 mph. Gusts around 0-10 mph are possible on exposed ground. Rain is forecast during this period.
66
Afternoon · 12:00–17:00
ExcellentSummit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground. Rain is forecast during this period.
89
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: a frost, down to -2°C.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 10 mph. It should stay dry. 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 frost up around 900 m, down to about -2°C. 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. Icy patches are likely on the rock, which makes it treacherous without winter kit. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly quartzite, a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. On the usual routes up you may also cross schist, which has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. 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 mphRain0.5 mm
Main factorswet rock likelySub-zero temperatures and moisture may leave icy patches on exposed rock
Representative rock around the summit and along available routes
QuartziteAn Socach Quartzite Formation
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. 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 Bhac and Beinn Iutharn Mhòr
quartzite, psammite, pelite or semipelite, granite, gneiss or gabbro
Geological detail and BGS records
Mapped variation
4 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
QuartziteAn Socach Quartzite Formation693–865 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands.
BGS record →
Route sample
PeliteSron Nan Dias Pelite And Limestone Formation520–598 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
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
LamprophyreNorth Britain Siluro-Devonian Calc-Alkaline Dyke SuiteAround 955 mSeen on Càrn Bhac and Beinn Iutharn Mhòr
Lamprophyre is a dark rock that usually forms thin dykes. It grips reasonably when dry and is poor when wet. It weathers easily and is often crumbly and loose, so treat it with suspicion.
BGS record →
Summit-area sample
Metadolostone and calcsilicate-rockBaddoch Burn Limestone Member
Limestone is a pale sedimentary rock. It grips well where it is rough, but polished limestone is glassy and is very slippery when wet. It is generally solid, though cracked and fissured along its edges.
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 Bhac on Sunday 8 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:000-15 mph northwesterlySummit gusts · 08:00-17:0010-20 mphFeels like-8 to -4°CPrecipitationLittle or noneCloud-free summit estimate90%Cloud base through day900-1,200 mFreezing level700-1,000 mDaylightSunrise 07:41 · Sunset 16:13 · 8.6 hours daylight
The day on the hill
A fine day on Càrn Bhac: dry, with light winds and clear tops for most of the day.
Wind
On the summit expect light winds of up to 15 mph, mainly north-westerly, 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 stay mostly clear of cloud, though brief patches cannot be ruled out.
Rain and ground
It should stay dry.
Warmth and kit
On the tops it will be around -4 to 0°C, feeling like -8 to -4°C in the wind. It turns milder through the day. 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 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 is more persistent early in this period, with better prospects later.
78
Afternoon · 12:00–17:00
ExcellentSummit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground.
93
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: a frost, down to -3°C.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 15 mph. It should stay dry. 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 frost up around 900 m, down to about -3°C. 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.
Fair conditions for exposed scrambling. The rock should be mostly dry, though drainage lines and shaded holds may still be damp. The rock around the summit is mostly quartzite, a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. On the usual routes up you may also cross schist, which has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. 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
QuartziteAn Socach Quartzite Formation
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. 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 Bhac and Beinn Iutharn Mhòr
quartzite, psammite, pelite or semipelite, granite, gneiss or gabbro
Geological detail and BGS records
Mapped variation
4 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
QuartziteAn Socach Quartzite Formation693–865 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands.
BGS record →
Route sample
PeliteSron Nan Dias Pelite And Limestone Formation520–598 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
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
LamprophyreNorth Britain Siluro-Devonian Calc-Alkaline Dyke SuiteAround 955 mSeen on Càrn Bhac and Beinn Iutharn Mhòr
Lamprophyre is a dark rock that usually forms thin dykes. It grips reasonably when dry and is poor when wet. It weathers easily and is often crumbly and loose, so treat it with suspicion.
BGS record →
Summit-area sample
Metadolostone and calcsilicate-rockBaddoch Burn Limestone Member
Limestone is a pale sedimentary rock. It grips well where it is rough, but polished limestone is glassy and is very slippery when wet. It is generally solid, though cracked and fissured along its edges.
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 Bhac on Monday 9 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:005-15 mph northerlySummit gusts · 08:00-17:005-15 mphFeels like-8 to -4°CPrecipitationLittle or noneCloud-free summit estimate55%Cloud base through day900-1,500 mFreezing level700-1,000 mDaylightSunrise 07:43 · Sunset 16:11 · 8.5 hours daylight
The day on the hill
Dry, with light winds on Càrn Bhac. Cloud could cover the tops and limit the views.
Wind
On the summit expect light winds of up to 10 mph, mainly northerly, with gusts of 5–15 mph at the windiest. Lower down on the open hillside the wind will be light, under 5 mph.
Cloud and visibility
Clear spells are possible, but cloud could cover the tops for part of the day. Forecast models differ on how much summit cloud develops. The cloud base could be as low as 500–800 m early in the morning.
Rain and ground
It should stay dry.
Warmth and kit
On the tops it will be around -4 to 0°C, feeling like -8 to -4°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 4:10pm, 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 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
ExcellentSummit winds around 5-15 mph. Gusts around 5-15 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.
86
Afternoon · 12:00–17:00
ExcellentSummit winds around 5-15 mph. Gusts around 5-15 mph are possible on exposed ground.
94
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: a frost, down to -4°C.59Mixed · 600 mView detailsHide details
Night beginning Tuesday 10 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 25 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. The air is damp up around 900 m, so expect heavy condensation. Leave the vents open. A frost up around 900 m, down to about -4°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. The rock around the summit is mostly quartzite, a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. On the usual routes up you may also cross schist, which has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. 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
QuartziteAn Socach Quartzite Formation
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. 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 Bhac and Beinn Iutharn Mhòr
quartzite, psammite, pelite or semipelite, granite, gneiss or gabbro
Geological detail and BGS records
Mapped variation
4 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
QuartziteAn Socach Quartzite Formation693–865 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands.
BGS record →
Route sample
PeliteSron Nan Dias Pelite And Limestone Formation520–598 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
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
LamprophyreNorth Britain Siluro-Devonian Calc-Alkaline Dyke SuiteAround 955 mSeen on Càrn Bhac and Beinn Iutharn Mhòr
Lamprophyre is a dark rock that usually forms thin dykes. It grips reasonably when dry and is poor when wet. It weathers easily and is often crumbly and loose, so treat it with suspicion.
BGS record →
Summit-area sample
Metadolostone and calcsilicate-rockBaddoch Burn Limestone Member
Limestone is a pale sedimentary rock. It grips well where it is rough, but polished limestone is glassy and is very slippery when wet. It is generally solid, though cracked and fissured along its edges.
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 Bhac on Tuesday 10 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
Summit wind · 08:00-17:000-15 mph easterlySummit gusts · 08:00-17:0015-25 mphFeels like-6 to -2°CPrecipitationLittle or noneCloud-free summit estimate45%Cloud base through day700-1,400 mFreezing level700-1,000 mDaylightSunrise 07:45 · Sunset 16:09 · 8.4 hours daylight
The day on the hill
A good day on Càrn Bhac, though expect cloud on the tops early.
Wind
On the summit expect light winds of up to 15 mph, mainly easterly, with gusts of 15–25 mph at the windiest.
Cloud and visibility
Cloud on the tops early should lift off them by midday. The cloud base could be as low as 700–1000 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 -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 8 hours of daylight. Sunset is around 4:10pm, 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 5-15 mph. Gusts around 15-25 mph are possible on exposed ground.
63
Afternoon · 12:00–17:00
ExcellentSummit 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.
85
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 -3°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 20 mph. It should stay dry. A frost at every height we checked (300-900 m), down to about -3°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.
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 quartzite, a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. On the usual routes up you may also cross schist, which has only fair grip when dry and is slippery when wet, as the mica gives it a greasy sheen. 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
QuartziteAn Socach Quartzite Formation
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands. 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 Bhac and Beinn Iutharn Mhòr
quartzite, psammite, pelite or semipelite, granite, gneiss or gabbro
Geological detail and BGS records
Mapped variation
4 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
QuartziteAn Socach Quartzite Formation693–865 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
Quartzite is a very hard rock made almost entirely of quartz. It grips well when dry and is notoriously slippery when wet. It splits into sharp, angular blocks, so expect loose scree and boulder fields, and edges that can cut gloves and hands.
BGS record →
Route sample
PeliteSron Nan Dias Pelite And Limestone Formation520–598 m samplesSeen on Càrn Bhac and Beinn Iutharn Mhòr
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
LamprophyreNorth Britain Siluro-Devonian Calc-Alkaline Dyke SuiteAround 955 mSeen on Càrn Bhac and Beinn Iutharn Mhòr
Lamprophyre is a dark rock that usually forms thin dykes. It grips reasonably when dry and is poor when wet. It weathers easily and is often crumbly and loose, so treat it with suspicion.
BGS record →
Summit-area sample
Metadolostone and calcsilicate-rockBaddoch Burn Limestone Member
Limestone is a pale sedimentary rock. It grips well where it is rough, but polished limestone is glassy and is very slippery when wet. It is generally solid, though cracked and fissured along its edges.
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 Bhac on Wednesday 11 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.
