White Coomb weather forecast.

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

Cloud-free timing: Clear early, clouding up later.

A grey, cloudy day on White Coomb: summit wind broadly 20-35 mph, with gusts 35-45 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 900–1200 m in the morning, lowering to 700–1000 m around midday and 600–900 m by late afternoon. The summit should be clear early, with cloud building around midday. Little or no rain expected.

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

A grey, cloudy day on White Coomb: summit wind broadly 5-25 mph, with gusts 25-35 mph during the evening (fresh and blowy). A meaningful thunderstorm risk is indicated from the morning into the evening. Avoid committing to exposed ridges if storms begin to build. Cloud base around 600-900 m in the morning, lowering to 400-700 m around midday. Expect the top to stay in cloud for most or all of daylight, with no dependable break. Some rain is likely, with around 2-5 mm indicated; timing and local totals remain uncertain. Confidence moderate (Summit wind could be roughly 13-28 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 13-28 mph, so treat the headline as mid-range.

Forecast confidence: Rain is possible, but forecast models differ by about 7 hours on when it arrives.

A grey, cloudy day on White Coomb: summit wind broadly 10-20 mph, with gusts 20-30 mph early in the morning (fresh and blowy). Cloud base mostly around 600–900 m through daylight. Expect the top to stay in cloud for most or all of daylight, with no dependable break. Little or no rain expected.

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

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

A grey, cloudy day on White Coomb: summit wind broadly 15-25 mph, with gusts 25-35 mph during the evening (fresh and blowy). A meaningful thunderstorm risk is indicated from the morning into the evening. Avoid committing to exposed ridges if storms begin to build. Cloud base around 600–900 m in the morning, then around 400–700 m around midday and 800–1100 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. Cloud is likely to hang lowest on southwestern slopes; the northeastern side should see somewhat higher bases and better breaks. Some rain is likely, with up to around 2 mm indicated; timing and local totals remain uncertain. Confidence moderate (Summit wind could be roughly 16-31 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 16-31 mph, so treat the headline as mid-range.

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

A rough, clagged-in day on White Coomb: summit wind broadly 30-55 mph, with gusts 60-70 mph during the afternoon (storm-force winds). Thunderstorms are possible from early morning into the afternoon. Keep an escape route from exposed ridges and descend if thunder develops. Much calmer lower down - generally 15-25 mph in the valley, rising towards the tops. Cloud base around 300-600 m in the morning, lifting to 600-900 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 western slopes; the eastern side should see somewhat higher bases and better breaks. A persistently wet day is possible, with around 10-20 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. Low confidence (Summit wind could be roughly 32-58 mph, which changes how difficult exposed walking may feel) - the summit peak could be anywhere from 32 to 58 mph; check again nearer the time.

Forecast confidence: Rain is possible, but forecast models differ by about 12 hours on when it arrives.

A rough, clagged-in day on White Coomb: summit wind broadly 25-40 mph, with gusts 45-55 mph early in the morning (gale-force winds). The ground is likely to be wet after recent rain. There could be a spate risk based on forecast rainfall. Burns and unbridged crossings may rise quickly. Most likely from around 08:00 until around 23:00. Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops. 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 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 2 to 6°C, feeling around -4 to 0°C in the wind - wrap up. Confidence moderate (Summit wind could be roughly 29-42 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 29-42 mph, so treat the headline as mid-range.