Geal-charn Mòr weather forecast.

A fine day on Geal-charn Mòr: summit wind broadly 5-20 mph, with gusts 15-25 mph during the evening (a moderate breeze). Any cloud sits well above the tops (base 1200-2000 m) - clear summits. Little or no rain expected.

A grey, cloudy day on Geal-charn Mòr: summit wind broadly 10-20 mph, with gusts 15-25 mph during the afternoon (fresh and blowy). Cloud base mostly around 400–700 m through daylight. Expect the top to stay in cloud for most or all of daylight, with no dependable break. Cloud is likely to hang lowest on northern slopes; the southern 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.

Forecast confidence: Rain is possible, but forecast models differ by about 15 hours on when it arrives.

Cloud-free timing: Cloudy early, clearing later.

A fine day on Geal-charn Mòr: summit wind broadly 5-15 mph, with gusts 10-20 mph early in the morning (a moderate breeze). Cloud base around 400-700 m in the morning, lifting to 1300-1600 m around midday. Summit cloud should lift later, bringing a better chance of clear views. Little or no rain expected.

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

A mixed day on Geal-charn Mòr: summit wind broadly 5-20 mph, with gusts 15-25 mph during the afternoon (a moderate breeze). Thunderstorms are a significant hazard from the morning into the evening. Exposed summits and ridges are a poor choice while storms are nearby. Cloud base around 400–700 m in the morning, then around 800–1100 m around midday and 700–1000 m by late afternoon. The top is likely to drift in and out of cloud, with the best chance of a view from midday into the afternoon. Cloud is likely to hang lowest on southern slopes; the northern 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. 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: Thunderstorm timing is inherently uncertain and may shift by several hours.

Cloud-free timing: Cloudy early, clearing later.

A mixed day on Geal-charn Mòr: summit wind broadly 5-30 mph, with gusts 30-40 mph during the evening (strong winds). Thunderstorms are a significant hazard from early morning into the evening. Exposed summits and ridges are a poor choice while storms are nearby. Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Cloud base around 400–700 m in the morning, lifting to 1200–1500 m around midday and 1300–1600 m by late afternoon. Summit cloud should lift later, bringing a better chance of clear views. Some rain is likely, with around 2-5 mm indicated; timing and local totals remain uncertain. Low confidence (Summit wind could be roughly 14-39 mph, which changes how difficult exposed walking may feel) - the summit peak could be anywhere from 14 to 39 mph; check again nearer the time. 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 67% early, falling to around 0% later.

A rough, clagged-in day on Geal-charn Mòr: summit wind broadly 25-40 mph, with gusts 45-55 mph around midday (gale-force winds). Thunderstorms are possible from the morning into the afternoon. 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. Cloud base around 1300–1600 m in the morning, lowering to 600–900 m around midday and 700–1000 m by late afternoon. Expect clag for much of the day, though a brief clearance is possible early in the morning. Cloud is likely to hang lowest on northwestern slopes; the southeastern side should see somewhat higher bases and better breaks. Some rain is likely, with around 5-10 mm indicated; timing and local totals remain uncertain. Cold on top: air temperature broadly 4 to 8°C, feeling around -2 to 2°C in the wind - wrap up. Confidence moderate (Summit wind could be roughly 23-42 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 23-42 mph, so treat the headline as mid-range.