Càrn Mòr Dearg weather forecast.

Cloud-free timing: Around 0% early, improving to around 100% later.

A wild day on Càrn Mòr Dearg: summit wind broadly 25-40 mph, with gusts 40-50 mph during the morning (gale-force winds). Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops. Cloud base around 500–800 m in the morning, lifting to 1000–1300 m around midday and 1500–1800 m by late afternoon. The top is likely to drift in and out of cloud, with the best chance of a view from late afternoon into the evening. Little or no rain expected.

Forecast confidence: A low thunderstorm risk remains difficult to time precisely.

Cloud-free timing: Around 67% early, improving to around 100% later.

A mixed day on Càrn Mòr Dearg: summit wind broadly 5-30 mph, with gusts 35-45 mph early in the morning (strong winds). Thunderstorms are possible from late afternoon into the evening. Keep an escape route from exposed ridges and descend if thunder develops. Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Any cloud sits well above the tops (base 1400-2000 m) - clear summits. Little or no rain expected. Confidence moderate (Summit wind could be roughly 19-34 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 19-34 mph, so treat the headline as mid-range.

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

A grey, cloudy day on Càrn Mòr Dearg: summit wind broadly 5-20 mph, with gusts 15-25 mph during the morning (fresh and blowy). A meaningful thunderstorm risk is indicated from around midday into the evening. Avoid committing to exposed ridges if storms begin to build. Cloud base around 400–700 m in the morning, then around 900–1200 m around midday and 600–900 m by late afternoon. Expect the top to stay in cloud for most or all of daylight, with no dependable break. Some rain is likely, with up to around 2 mm indicated; timing and local totals remain uncertain. Cloud base is the least certain part of this - the models are only moderately agreed, so it could sit a couple of hundred metres either way.

Forecast confidence: A low thunderstorm risk remains difficult to time precisely.

Cloud-free timing: Around 0% early, improving to around 60% later.

A mixed day on Càrn Mòr Dearg: summit wind broadly 0-10 mph, with gusts 5-15 mph early in the morning (light winds). Thunderstorms are possible from late afternoon into the evening. Keep an escape route from exposed ridges and descend if thunder develops. Cloud base around 400-700 m in the morning, lifting to 1300-1600 m around midday. The top is likely to drift in and out of cloud, with the best chance of a view from around midday into the evening. Some rain is likely, with up to around 2 mm indicated; timing and local totals remain uncertain.

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

Cloud-free timing: Around 0% early, improving to around 100% later.

A mixed day on Càrn Mòr Dearg: summit wind broadly 5-15 mph, with gusts 10-20 mph during the afternoon (a moderate breeze). A meaningful thunderstorm risk is indicated from the morning into the afternoon. Avoid committing to exposed ridges if storms begin to build. Cloud base around 400–700 m in the morning, lifting to 600–900 m around midday and 1400–1700 m by late afternoon. The top is likely to drift in and out of cloud, with the best chance of a view from late afternoon into the evening. Some rain is likely, with up to around 2 mm indicated; timing and local totals remain uncertain.

Forecast confidence: A low thunderstorm risk remains difficult to time precisely.

A grey, cloudy day on Càrn Mòr Dearg: summit wind broadly 10-35 mph, with gusts 40-50 mph during the evening (gale-force winds). Thunderstorms are possible from the morning into the evening. Keep an escape route from exposed ridges and descend if thunder develops. Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Cloud base around 800–1100 m in the morning, then around 400–700 m around midday and 700–1000 m by late afternoon. Expect the top to stay in cloud for most or all of daylight, with no dependable break. Cloud is likely to hang lowest on western slopes; the eastern side should see somewhat higher bases and better breaks. Some rain is likely, with around 2-5 mm indicated; timing and local totals remain uncertain. Cold on top: air temperature broadly 4 to 8°C, feeling around -4 to 0°C in the wind - wrap up. Low confidence (Summit wind could be roughly 24-45 mph, which changes how difficult exposed walking may feel) - the summit peak could be anywhere from 24 to 45 mph; check again nearer the time.