Erw y Ddafad-ddu weather forecast.

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

A mixed day on Erw y Ddafad-ddu: summit wind broadly 15-35 mph, with gusts 35-45 mph early in the morning (strong winds). Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Cloud base around 600-900 m in the morning, lifting to 1500-1800 m around midday and 1600-1900 m by late afternoon. The top is likely to drift in and out of cloud; views may come and go. 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 up to around 2 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.

Cloud-free timing: Around 25% early, improving to around 100% later.

A fine day on Erw y Ddafad-ddu: summit wind broadly 5-20 mph, with gusts 20-30 mph early in the morning (fresh and blowy). Little or no rain expected. 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.

A mixed day on Erw y Ddafad-ddu: summit wind broadly 10-25 mph, with gusts 25-35 mph during the morning (strong winds). Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Any cloud sits well above the tops (base 1500-2100 m) - clear summits. 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 18-26 mph, so treat the headline as mid-range. Treat the cloud base with caution - the models disagree on humidity, so it could be well above or below the figure given.

A fine day on Erw y Ddafad-ddu: summit wind broadly 5-25 mph, with gusts 20-30 mph early in the morning (fresh and blowy). Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Any cloud sits well above the tops (base 1100-1800 m) - clear summits. Little or no rain expected. Bright spells with UV up to 6 - sunscreen on exposed skin. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 12 to 25 mph; check again nearer the time. Treat the cloud base with caution - the models disagree on humidity, so it could be well above or below the figure given.

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

A mixed day on Erw y Ddafad-ddu: summit wind broadly 0-20 mph, with gusts 20-30 mph early in the morning (fresh and blowy). Cloud base around 500-800 m in the morning, lifting to 1000-1300 m around midday and 1600-1900 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. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 11 to 26 mph; check again nearer the time.

A mixed day on Erw y Ddafad-ddu: summit wind broadly 15-30 mph, with gusts 30-40 mph during the morning (strong winds). Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Any cloud sits well above the tops (base 1500-2100 m) - clear summits. Little or no rain expected. Bright spells with UV up to 6 - sunscreen on exposed skin. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 15 to 34 mph; check again nearer the time.

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

A mixed day on Erw y Ddafad-ddu: summit wind broadly 15-35 mph, with gusts 35-45 mph early in the morning (gale-force winds). Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Little or no rain expected. Bright spells with UV up to 6 - sunscreen on exposed skin. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 19 to 38 mph; check again nearer the time. Treat the cloud base with caution - the models disagree on humidity, so it could be well above or below the figure given.