Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Dry and sunny
Extensive strong warm sunshine. The mountains free of cloud once any early mist patches disperse.
Mild
Temperatures +5C or above on higher summits. Comfortable temperatures on lower terrain, but feeling cool if exposed to breeze higher up, especially if stationary. Pack extra layers.
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Dry and sunny
Extensive strong warm sunshine. The mountains free of cloud once any early mist patches disperse.
Mild
Temperatures +5C or above on higher summits. Comfortable temperatures on lower terrain, but feeling cool if exposed to breeze higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 16th January 2025
Last updated
Wed 15th Jan 25 at
4:30PM
Summary for all mountain areas
Almost all mountains cloud free but low level fog coming in off the south and west coasts and rolling up some coastal uplands and mountains. Many summits warmer than their mid-slopes. Sudden increase of wind with height; very gusty gales in the Highlands. Hazy low down in some areas; superb visibility from high ground.
Headline for Eryri / Snowdonia National Park
Dry and sunny with a cool upland breeze
How windy? (On the summits)
Southerly 15 to 25mph. Strongest higher summits Yr Wyddfa/Snowdon range in the afternoon.
Effect of the wind on you?
Fairly small east and mid-Wales. Will impede ease of walking Yr Wyddfa/Snowdon range; sudden gusts in places.
How Wet?
Rain not expected
Cloud on the hills?
Not expected
Low cloud will move in from Cardigan Bay late in the day. Small chance of becoming more extensive over lower terrain sooner.
Chance of cloud free summits?
Greater than 90%
Sunshine and air clarity?
Extensive bright sunshine and higher up excellent visibility. Hazy and in some areas dull lower slopes.
How Cold? (at 900m)
9C but slightly cooler on mid-slopes. Feeling below 5C in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 17th January 2025
Last updated
Wed 15th Jan 25 at
4:30PM
How windy? (On the summits)
Southwesterly 15 to 25mph, tending to ease through the day. May become southerly later.
Effect of the wind on you?
Often small but there may be sudden gusts at times, especially near Yr Wyddfa/Snowdon. Marked wind chill on mid-slopes.
How Wet?
Risk of drizzle near west coast
Little or no rain for much of the area. Risk of drizzle on upslopes facing the west coast.
Cloud on the hills?
Lower coastal slopes shrouded
Extensive cloud on lower slopes facing the west coast. Higher summits above the cloud deck. Cloud more broken towards the Berwyn Mountains.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Very clear air and bright sunshine if above the cloud deck. Poor visibility at lower levels and becoming hazier towards mid-Wales.
How Cold? (at 900m)
Possibly as high as 8C, but noticeably colder lower down, perhaps 3C. Feeling around -5C on the mid-slopes in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 18th January 2025
Last updated
Wed 15th Jan 25 at
4:30PM
How windy? (On the summits)
Southerly 10 to 15mph, may be variable in direction.
Effect of the wind on you?
Small.
How Wet?
Not expected
Cloud on the hills?
Probably very little after the morning
Any morning cloud in the valley will soon evaporate. High ground likely to be largely cloud free.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Extensive sunshine. Hazy low down but superb visibility on high ground.
How Cold? (at 900m)
5 to 7C but significantly cooler on lower slopes.
Freezing Level
Above the summits but near or below freezing on lower ground initially.
Planning Outlook
Rain moving in some areas from the west on Sunday and Monday before high pressure starts building again and suppressing any rainfall to pockets of drizzle. Conditions may become gloomy low down as cloud is trapped below inversion; summits likely to remain clear with superb visibility. Freeze-thaw cycles will resume on the Scottish mountains though next week.