Chwarel y Fan weather forecast.

A mixed day on Chwarel y Fan: summit wind broadly 10-25 mph, with gusts 25-35 mph early in the morning (strong winds). Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops. Any cloud sits well above the tops (base 1000-2000 m) - clear summits. Little or no rain expected.

A fine day on Chwarel y Fan: summit wind broadly 0-15 mph, with gusts 10-20 mph during the evening (a moderate breeze). Any cloud sits well above the tops (base 1400-2100 m) - clear summits. Little or no rain expected. Confidence moderate (ensemble members show a moderate spread) - the summit peak could reasonably be 7-12 mph, so treat the headline as mid-range. 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 fine day on Chwarel y Fan: summit wind broadly 10-20 mph, with gusts 15-25 mph around midday (fresh and blowy). Any cloud sits well above the tops (base 2300-2600 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 10-17 mph, so treat the headline as mid-range. 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 fine day on Chwarel y Fan: summit wind broadly 5-20 mph, with gusts 20-30 mph during the evening (fresh and blowy). Any cloud sits well above the tops (base 1300-2400 m) - clear summits. Little or no rain expected. Bright spells with UV up to 7 - sunscreen on exposed skin. Confidence moderate (ensemble members show a moderate spread) - the summit peak could reasonably be 13-21 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.

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

A fine day on Chwarel y Fan: summit wind broadly 5-25 mph, with gusts 20-30 mph early in the morning (fresh and blowy). Little or no rain expected. Bright spells with UV up to 7 - sunscreen on exposed skin. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 11 to 27 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.

A fine day on Chwarel y Fan: summit wind broadly 10-25 mph, with gusts 20-30 mph during the evening (fresh and blowy). Any cloud sits well above the tops (base 1500-2100 m) - clear summits. Little or no rain expected. Bright spells with UV up to 7 - sunscreen on exposed skin. Confidence moderate (ensemble members show a moderate spread) - the summit peak could reasonably be 15-25 mph, so treat the headline as mid-range. 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 Chwarel y Fan: summit wind broadly 10-30 mph, with gusts 25-35 mph early in 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 2000-2400 m) - clear summits. Little or no rain expected. Bright spells with UV up to 7 - sunscreen on exposed skin. Low confidence (ensemble members are widely spread) - the summit peak could be anywhere from 16 to 35 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.