Cadair Idris - Penygadair weather forecast.

A grey, cloudy day on Cadair Idris - Penygadair: summit wind broadly 15-35 mph, with gusts 35-45 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 600-900 m - expect clag for much of the day, though a brief clearance is possible from late afternoon into the evening. Cloud will be lowest on the NW slopes, down to about 700-1000 m; the SE side should be clearer, lifting to around 900-1200 m. 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.

A mixed day on Cadair Idris - Penygadair: summit wind broadly 10-20 mph, with gusts 20-30 mph during the evening (fresh and blowy). Cloud base 600-1100 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. Some rain is likely, with around 2-5 mm indicated; timing and local totals remain uncertain. 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 14-19 mph, so treat the headline as mid-range.

A fine day on Cadair Idris - Penygadair: summit wind broadly 10-25 mph, with gusts 20-30 mph during the evening (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 1000-1600 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 13 to 29 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 Cadair Idris - Penygadair: 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 3000-3300 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 11 to 31 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.

A fine day on Cadair Idris - Penygadair: summit wind broadly 5-15 mph, with gusts 10-20 mph during the morning (a moderate breeze). Cloud base 900-1300 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. 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 6 to 17 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.

A fine day on Cadair Idris - Penygadair: summit wind broadly 15-25 mph, with gusts 20-30 mph during the morning (fresh and blowy). Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops. Cloud base 800-1600 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. 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 8 to 29 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 mixed day on Cadair Idris - Penygadair: 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. Cloud base 700-1400 m - the top is likely to drift in and out of cloud, with the best chance of a view from early morning into the afternoon. 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 17 to 45 mph; check again nearer the time.