Geal-chàrn (Alder) weather forecast.

Cloud-free timing: Around 0% early, improving to around 40% later.

A grey, cloudy day on Geal-chàrn (Alder): summit wind broadly 20-35 mph, with gusts 40-50 mph during the evening (gale-force winds). Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Cloud base around 800–1100 m in the morning, lifting to 1000–1300 m around midday and 900–1200 m by late afternoon. The top is likely to drift in and out of cloud, with the best chance of a view during the afternoon. Little or no rain expected. Cold on top: air temperature broadly 4 to 8°C, feeling around 0 to 4°C in the wind - wrap up.

Cloud-free timing: Around 33% early, improving to around 60% later.

A mixed day on Geal-chàrn (Alder): summit wind broadly 10-30 mph, with gusts 25-35 mph early in the morning (fresh and blowy). Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Cloud base around 1000–1300 m in the morning, then around 1400–1700 m around midday and 1200–1500 m by late afternoon. The top is likely to drift in and out of cloud, with the best chance of a view from the morning into the evening. Little or no rain expected. Confidence moderate (forecast models agree on the walking impact of the wind) - the summit peak could reasonably be 17-29 mph, so treat the headline as mid-range.

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

A grey, cloudy day on Geal-chàrn (Alder): summit wind broadly 10-20 mph, with gusts 20-30 mph during the evening (fresh and blowy). Thunderstorms are possible from around midday 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 900-1200 m around midday. 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 11 hours on when it arrives.

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

A mixed day on Geal-chàrn (Alder): summit wind broadly 0-15 mph, with gusts 5-15 mph during the morning (a moderate breeze). 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. Little or no rain expected.

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

Cloud-free timing: Around 0% early, improving to around 80% later.

A mixed day on Geal-chàrn (Alder): summit wind broadly 5-15 mph, with gusts 10-20 mph during the afternoon (a moderate breeze). Thunderstorms are possible from the morning into the evening. Keep an escape route from exposed ridges and descend if thunder develops. Cloud base around 300–600 m in the morning, then around 1300–1600 m around midday and 1100–1400 m by late afternoon. 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.

A rough, clagged-in day on Geal-chàrn (Alder): summit wind broadly 10-35 mph, with gusts 40-50 mph during the evening (gale-force winds). A meaningful thunderstorm risk is indicated from early morning into the evening. Avoid committing to exposed ridges if storms begin to build. Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Cloud base around 300–600 m in the morning, lifting to 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. A persistently wet day is possible, with around 5-10 mm indicated; local totals could vary considerably. 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 21-42 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 21-42 mph, so treat the headline as mid-range.