Ben Macdui weather forecast.

Cloud-free timing: Around 100% early, falling to around 40% later.

A mixed day on Ben Macdui: summit wind broadly 10-25 mph, with gusts 20-30 mph during the morning (fresh and blowy). Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Cloud base around 0–300 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 morning. Cloud is likely to hang lowest on southeastern slopes; the northwestern side should see somewhat higher bases and better breaks. Little or no rain expected.

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

A grey, cloudy day on Ben Macdui: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (strong 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 0-10 mph in the valley, rising towards the tops. 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. 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. 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.

Cloud-free timing: Around 0% early, improving to around 100% later.

A mixed day on Ben Macdui: summit wind broadly 5-20 mph, with gusts 15-25 mph early in the morning (fresh and blowy). Cloud base around 400–700 m in the morning, lifting to 1300–1600 m around midday and 1800–2100 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. Little or no rain expected.

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

Cloud-free timing: Cloudier around midday at about 0%; around 33% early and 40% later.

A grey, cloudy day on Ben Macdui: summit wind broadly 10-25 mph, with gusts 20-30 mph around midday (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 800–1100 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. 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 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: Thunderstorm timing is inherently uncertain and may shift by several hours.

A rough, clagged-in day on Ben Macdui: summit wind broadly 10-40 mph, with gusts 45-55 mph during the evening (gale-force winds). A meaningful thunderstorm risk is indicated from the 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 1200-1500 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. Some rain is likely, with around 2-5 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. Low confidence (Summit wind could be roughly 21-57 mph, which changes how difficult exposed walking may feel) - the summit peak could be anywhere from 21 to 57 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: Summit wind could be roughly 34-53 mph, which changes how difficult exposed walking may feel.

A rough, clagged-in day on Ben Macdui: summit wind broadly 35-45 mph, with gusts 55-65 mph early in the morning (storm-force winds). Much calmer lower down - generally 15-25 mph in the valley, rising towards the tops. Cloud base around 800–1100 m in the morning, lowering to 400–700 m around midday and 500–800 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 0 to 4°C, feeling around -8 to -4°C in the wind - wrap up. Confidence moderate (Summit wind could be roughly 34-53 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 34-53 mph, so treat the headline as mid-range.