A mixed day on Càrn Mairg: summit wind broadly 15-35 mph, with gusts 40-50 mph early in the morning (gale-force winds). Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Cloud base 700-1600 m - the top is likely to drift in and out of cloud, with the best chance of a view from around midday into the evening. The cloud base is very changeable today - it could sit much higher or lower than that at times, so read the sky. Cloud will be lowest on the NW slopes, down to about 900-1200 m; the SE side should be clearer, lifting to around 1100-1400 m. Some rain is likely, with up to around 2 mm indicated; timing and local totals remain uncertain. Cold on top: air temperature broadly 2 to 6°C, feeling around -4 to 0°C in the wind - wrap up.
Càrn Mairg weather forecast.
1,042 m summit forecast for wind, cloud, rain and temperature. Updated from the Thursday 6 August 2026 model run.
Seven-day Càrn Mairg forecast.
Conditions can change quickly with height. Use the day-by-day summit detail below, then check again close to departure.
A rough, clagged-in day on Càrn Mairg: summit wind broadly 40-60 mph, with gusts 70-80 mph during the evening (storm-force winds). Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops. Cloud base 500-800 m - expect the top to stay in cloud for most or all of the day, with no dependable break. Cloud will be lowest on the SW slopes, down to about 400-700 m; the NE side should be clearer, lifting to around 800-1100 m. 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. Confidence moderate (ensemble members show a moderate spread) - the summit peak could reasonably be 35-65 mph, so treat the headline as mid-range.
A rough, clagged-in day on Càrn Mairg: summit wind broadly 35-50 mph, with gusts 60-70 mph early in the morning (storm-force winds). Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops. Cloud base 500-800 m - expect the top to stay in cloud for most or all of the day, with no dependable break. Cloud will be lowest on the SW slopes, down to about 400-700 m; the NE side should be clearer, lifting to around 700-1000 m. 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 (ensemble members are widely spread) - the summit peak could be anywhere from 27 to 56 mph; check again nearer the time.
A wild day on Càrn Mairg: summit wind broadly 25-50 mph, with gusts 55-65 mph early in the morning (storm-force winds). Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops. Cloud base 500-1500 m - the top is likely to drift in and out of cloud, with the best chance of a view from late afternoon into the evening. The cloud base is very changeable today - it could sit much higher or lower than that at times, so read the sky. Cloud will be lowest on the W slopes, down to about 900-1200 m; the E side should be clearer, lifting to around 1100-1400 m. Some rain is likely, with up to around 2 mm indicated; timing and local totals remain uncertain. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 27 to 55 mph; check again nearer the time.
A mixed day on Càrn Mairg: summit wind broadly 5-20 mph, with gusts 20-30 mph early in the morning (fresh and blowy). Cloud base 900-1600 m - the top is likely to drift in and out of cloud, with the best chance of a view from the morning into the evening. The cloud base is very changeable today - it could sit much higher or lower than that at times, so read the sky. Little or no rain expected. Cold on top: air temperature broadly 4 to 8°C, feeling around 0 to 4°C in the wind - wrap up. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 8 to 25 mph; check again nearer the time.
A mixed day on Càrn Mairg: summit wind broadly 10-30 mph, with gusts 30-40 mph during the evening (strong winds). Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Cloud base 600-1600 m - the top is likely to drift in and out of cloud, with the best chance of a view during the evening. The cloud base is very changeable today - it could sit much higher or lower than that at times, so read the sky. Little or no rain expected. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 12 to 37 mph; check again nearer the time.
A rough, clagged-in day on Càrn Mairg: summit wind broadly 30-45 mph, with gusts 55-65 mph around midday (storm-force winds). Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Cloud base 500-1100 m - expect clag for much of the day, though a brief clearance is possible during the afternoon. Cloud will be lowest on the S slopes, down to about 600-900 m; the N side should be clearer, lifting to around 1000-1300 m. Some rain is likely, with up to around 2 mm indicated; timing and local totals remain uncertain. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 25 to 70 mph; check again nearer the time.
Forecast run: 2026-08-06
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