An Coileachan weather forecast.

Cloud-free timing: Around 0% early, improving to around 83% later.

A mixed day on An Coileachan: summit wind broadly 10-30 mph, with gusts 25-35 mph during the evening (strong winds). The ground is likely to be wet after recent rain. Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Cloud base around 500-800 m in the morning, lifting to 1000-1300 m around midday and 1000-1300 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. Cloud is likely to hang lowest on western slopes; the eastern side should see somewhat higher bases and better breaks. Little or no rain expected. Cold on top: air temperature broadly 2 to 6°C, feeling around -4 to 0°C in the wind - wrap up.

A rough, clagged-in day on An Coileachan: summit wind broadly 40-55 mph, with gusts 65-75 mph during 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 01:00 until around 02:00 the following day. Much calmer lower down - generally 15-25 mph in the valley, rising towards the tops. Cloud base mostly around 500-800 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 southwestern slopes; the northeastern 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 6 to 10°C, feeling around -2 to 2°C in the wind - wrap up. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 30 to 60 mph; check again nearer the time.

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

A rough, clagged-in day on An Coileachan: summit wind broadly 45-55 mph, with gusts 70-80 mph around midday (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 01:00 until around 03:00 the following day. Much calmer lower down - generally 15-25 mph in the valley, rising towards the tops. Cloud base around 500-800 m in the morning, 700-1000 m around midday and 500-800 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 southwestern slopes; the northeastern 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. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 27 to 64 mph; check again nearer the time.

Cloud-free timing: Around 0% early, improving to around 83% later.

A mixed day on An Coileachan: summit wind broadly 20-35 mph, with gusts 40-50 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 in the morning, lifting to 700-1000 m around midday and 1400-1700 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 western slopes; the eastern side should see somewhat higher bases and better breaks. Little or no rain expected. Cold on top: air temperature broadly 4 to 8°C, feeling around -2 to 2°C in the wind - wrap up. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 20 to 40 mph; check again nearer the time.

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

A mixed day on An Coileachan: summit wind broadly 5-20 mph, with gusts 15-25 mph early in the morning (a moderate breeze). The ground is likely to be wet after recent rain. Cloud base around 500-800 m in the morning, 1500-1800 m around midday and 1100-1400 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. Cold on top: air temperature broadly 2 to 6°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 6 to 17 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.

Cloud-free timing: Best around midday at about 75%; lowest early at about 50%.

A mixed day on An Coileachan: summit wind broadly 10-30 mph, with gusts 30-40 mph during the evening (strong winds). Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Cloud base around 3100-3400 m in the morning, 1000-1300 m around midday and 2000-2300 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. Bright spells with UV up to 5 - sunscreen on exposed skin. Confidence moderate (ensemble members show a moderate spread) - the summit peak could reasonably be 16-30 mph, so treat the headline as mid-range.

Cloud-free timing: Around 25% early, improving to around 83% later.

A wild day on An Coileachan: summit wind broadly 25-40 mph, with gusts 45-55 mph during the evening (gale-force winds). A meaningful thunderstorm risk is indicated from the morning into the afternoon. 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 in the morning, 1000-1300 m around midday and 600-900 m by late afternoon. The top is likely to drift in and out of cloud, with the best chance of a view from the morning into 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. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 20 to 65 mph; check again nearer the time.