Càrn Dearg (Loch Pattack) weather forecast.

Cloud-free timing: Best around midday at about 100%; around 67% early and 60% later.

A mixed day on Càrn Dearg (Loch Pattack): summit wind broadly 15-30 mph, with gusts 35-45 mph during the afternoon (strong winds). Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Little or no rain expected.

A grey, cloudy day on Càrn Dearg (Loch Pattack): summit wind broadly 10-20 mph, with gusts 20-30 mph early in the morning (fresh and blowy). Cloud base around 400–700 m in the morning, then around 600–900 m around midday and 400–700 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 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.

A grey, cloudy day on Càrn Dearg (Loch Pattack): summit wind broadly 5-15 mph, with gusts 10-20 mph around midday (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 400–700 m in the morning, then around 800–1100 m around midday and 400–700 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 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: Around 0% early, improving to around 80% later.

A grey, cloudy day on Càrn Dearg (Loch Pattack): summit wind broadly 10-20 mph, with gusts 20-30 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 400–700 m through the morning, lifting to 1300–1600 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 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.

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

Cloud-free timing: Best around midday at about 75%; around 0% early and 0% later.

A rough, clagged-in day on Càrn Dearg (Loch Pattack): summit wind broadly 10-40 mph, with gusts 45-55 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. 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 5-15 mph in the valley, rising towards the tops. Cloud base around 300–600 m in the morning, then around 1200–1500 m around midday and 300–600 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 western slopes; the eastern 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 6 to 10°C, feeling around 0 to 4°C in the wind - wrap up. Low confidence (Summit wind could be roughly 18-46 mph, which changes how difficult exposed walking may feel) - the summit peak could be anywhere from 18 to 46 mph; check again nearer the time.

Forecast confidence: Summit wind could be roughly 24-55 mph, which changes how difficult exposed walking may feel.

A rough, clagged-in day on Càrn Dearg (Loch Pattack): summit wind broadly 25-45 mph, with gusts 50-60 mph early in the morning (gale-force winds). The ground is likely to be wet after recent rain. Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops. Cloud base around 400–700 m through the morning, lifting to 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 northwestern slopes; the southeastern 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 2 to 6°C, feeling around -6 to -2°C in the wind - wrap up. Low confidence (Summit wind could be roughly 24-55 mph, which changes how difficult exposed walking may feel) - the summit peak could be anywhere from 24 to 55 mph; check again nearer the time.