Ben Cruachan weather forecast.

Cloud-free timing: Around 100% early, falling to around 60% later.

A mixed day on Ben Cruachan: summit wind broadly 15-30 mph, with gusts 35-45 mph early in the morning (strong winds). Any cloud sits well above the tops (base 1400-1700 m) - clear summits. Little or no rain expected.

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

A grey, cloudy day on Ben Cruachan: summit wind broadly 10-25 mph, with gusts 20-30 mph during the afternoon (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 800-1100 m in the morning, lowering to 600-900 m around midday. Expect clag for much of the day, though a brief clearance is possible during the morning. 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 up to around 2 mm indicated; timing and local totals remain uncertain.

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

Cloud-free timing: Around 0% early, improving to around 20% later.

A rough, clagged-in day on Ben Cruachan: summit wind broadly 5-20 mph, with gusts 15-25 mph during the afternoon (fresh and blowy). Thunderstorms are possible from early morning into the afternoon. Keep an escape route from exposed ridges and descend if thunder develops. Cloud base mostly around 400–700 m through daylight. Expect clag for much of the day, though a brief clearance is possible during the evening. A persistently wet day is possible, with around 5-10 mm indicated; local totals could vary considerably.

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

A rough, clagged-in day on Ben Cruachan: summit wind broadly 15-30 mph, with gusts 30-40 mph during the evening (strong 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 400–700 m through the morning, lifting to 600–900 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 southern slopes; the northern 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. Confidence moderate (Summit wind could be roughly 20-37 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 20-37 mph, so treat the headline as mid-range.

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

A rough, clagged-in day on Ben Cruachan: summit wind broadly 20-60 mph, with gusts 70-80 mph during the evening (storm-force winds). A meaningful thunderstorm risk is indicated from early morning into the evening. Avoid committing to exposed ridges if storms begin to build. 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 00:00 until around 03:00 the following day. Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops. Cloud base mostly around 300–600 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 10-20 mm indicated; local totals could vary considerably. Cold on top: air temperature broadly 2 to 6°C, feeling around -6 to -2°C in the wind - wrap up. Low confidence (Summit wind could be roughly 30-71 mph, which changes how difficult exposed walking may feel) - the summit peak could be anywhere from 30 to 71 mph; check again nearer the time.

Forecast confidence: Summit wind could be roughly 42-85 mph, which changes how difficult exposed walking may feel.

A rough, clagged-in day on Ben Cruachan: summit wind broadly 30-65 mph, with gusts 75-85 mph early in the morning (storm-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 00:00 until around 17:00. Much calmer lower down - generally 15-25 mph in the valley, rising towards the tops. Cloud base around 400–700 m through the morning, lifting to 900–1200 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 northwestern slopes; the southeastern 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 -8 to -4°C in the wind - wrap up. Low confidence (Summit wind could be roughly 42-85 mph, which changes how difficult exposed walking may feel) - the summit peak could be anywhere from 42 to 85 mph; check again nearer the time.