Lochnagar weather forecast.

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

Cloud-free timing: Best around midday at about 25%; around 0% early and 0% later.

A grey, cloudy day on Lochnagar: summit wind broadly 15-30 mph, with gusts 30-40 mph during the afternoon (strong winds). Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Cloud base around 500–800 m in the morning, then around 1000–1300 m around midday and 700–1000 m by late afternoon. Expect clag for much of the day, though a brief clearance is possible during the afternoon. 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 Lochnagar: summit wind broadly 10-25 mph, with gusts 20-30 mph early in the morning (fresh and blowy). 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 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 northern slopes; the southern 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. Confidence moderate (Summit wind could be roughly 11-26 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 11-26 mph, so treat the headline as mid-range.

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

Cloud-free timing: Cloudy early, clearing later.

A mixed day on Lochnagar: summit wind broadly 5-15 mph, with gusts 10-20 mph early in the morning (a moderate breeze). Thunderstorms are possible from the morning into the evening. Keep an escape route from exposed ridges and descend if thunder develops. The ground is likely to be wet after recent rain. Cloud base around 400–700 m in the morning, lifting to 1300–1600 m around midday and 2900–3200 m by late afternoon. Summit cloud should lift later, bringing a better chance of clear views. Little or no rain expected.

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

Cloud-free timing: Around 67% early, falling to around 0% later.

A grey, cloudy day on Lochnagar: summit wind broadly 10-25 mph, with gusts 20-30 mph during the afternoon (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 1300–1600 m in the morning, lowering to 900–1200 m around midday and 800–1100 m by late afternoon. Expect clag for much of the day, though a brief clearance is possible early in the morning. Some rain is likely, with around 2-5 mm indicated; timing and local totals remain uncertain. Confidence moderate (Summit wind could be roughly 11-27 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 11-27 mph, so treat the headline as mid-range.

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 mixed day on Lochnagar: summit wind broadly 5-35 mph, with gusts 35-45 mph during the evening (strong winds). Thunderstorms are a significant hazard from the morning into the evening. Exposed summits and ridges are a poor choice while storms are nearby. Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Cloud base around 500-800 m in the morning, lifting to 1200-1500 m around midday. The top is likely to drift in and out of cloud, with the best chance of a view from the morning into the evening. Some rain is likely, with around 2-5 mm indicated; timing and local totals remain uncertain. Low confidence (Summit wind could be roughly 14-43 mph, which changes how difficult exposed walking may feel) - the summit peak could be anywhere from 14 to 43 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: A low thunderstorm risk remains difficult to time precisely.

Cloud-free timing: Around 33% early, falling to around 0% later.

A rough, clagged-in day on Lochnagar: summit wind broadly 30-45 mph, with gusts 50-60 mph early in the morning (storm-force winds). Thunderstorms are possible from early morning into the evening. Keep an escape route from exposed ridges and descend if thunder develops. Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops. Cloud base around 1000–1300 m in the morning, lowering to 600–900 m around midday and 700–1000 m by late afternoon. Expect clag for much of the day, though a brief clearance is possible early in the morning. 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. Confidence moderate (Summit wind could be roughly 29-52 mph, which changes how difficult exposed walking may feel) - the summit peak could reasonably be 29-52 mph, so treat the headline as mid-range.