Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Clear
Excellent or superb visibility, no navigation issues.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Clear
Excellent or superb visibility, no navigation issues.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 22nd May 2026
Last updated
Thu 21st May 26 at
4:04PM
Summary for all mountain areas
Scotland; Strong, gusty south-westerly with extensive low cloud and patchy rain and drizzle. Tending to ease off for many hills, with rising cloud bases. England and Wales: South-west winds, but mostly dry with warm sunshine, some cloud banks, mostly coastal hills.
Headline for Eryri / Snowdonia National Park
Blustery, but mostly dry with sunshine and increasingly warm. Some high cloud.
How windy? (On the summits)
South-southwesterly 25-35mph; gusty, downslope too, up to 40mph early. Easing to 20-30mph, staying gusty tops.
Effect of the wind on you?
Blustery in exposure all day, particularly early with strenuous walking, buffeting gusts, and feeling cool. An easing trend.
How Wet?
Substantially or completely dry
Late in the day, a rising risk of patchy rain. May well be dry all of daylight.
Cloud on the hills?
Chance of banks west slopes
Slopes facing Cardigan Bay/Llyn Peninsula may see thin banks of cloud between 500-900m, most likely midday/afternoon hours. Otherwise, hills substantially clear.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Mostly sunny but weakened by a veil of high cloud. Very good visibility.
How Cold? (at 900m)
11 to 13C; rising to a warm 20C in the valleys. Feeling near 5C in early strong wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 23rd May 2026
Last updated
Thu 21st May 26 at
4:04PM
How windy? (On the summits)
West-southwesterly 10-15mph, some variability and occasional stronger gusts.
Effect of the wind on you?
Fairly small but nuisance gusts much of the day over tops and elevated passes.
How Wet?
Likely dry
Chance of some early fine drizzle over Yr Wyddfa/Snowdon, perhaps some high western aspects further south, this fading through morning for dry hills.
Cloud on the hills?
Early low cloud west, most hills clearing
Low fog on western slopes at dawn, largely below 700m (chance high tops above a layer of cloud, but uncertain). Cloud rises and breaks, hills mostly clear by afternoon, perhaps odd banks west slopes at times. East Wales/Carneddau sees little cloud all day.
Chance of cloud free summits?
Rising to 70%
Sunshine and air clarity?
Mostly sunny, some patchy higher cloud at times. Very good visibility.
How Cold? (at 900m)
10C rising to 13C (to a warm 22C east valleys). Staying elevated into night; little change with height.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 24th May 2026
Last updated
Thu 21st May 26 at
4:04PM
How windy? (On the summits)
South to south-westerly 10 to 15mph
Effect of the wind on you?
Mostly negligible
How Wet?
Dry
Cloud on the hills?
Mountains clear
Aside from some patches of banks across coastal hills early in morning, which will burn off, hills are expected to be clear.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Extensive sunshine coming through. Very good visibility.
How Cold? (at 900m)
12C lifting to 16C, warm
Freezing Level
Well above the summits
Planning Outlook
Pressure builds this weekend, centred over England and Wales where it will be warm and sunny. To the north of the high, a blustery and gusty south-westerly will persist across the Highlands with patchy rain and hill fog,mainly in the west and northwest. Very warm by Sunday and Monday valleys of Wales and England, mid to high 20s. Low 20s glens into southern and eastern Scotland. Next week, high pressure extends over Scotland, cutting of the low cloud and drizzle from northwest Scotland by midweek. Warm sunshine with light winds, still very warm into the valleys of England and Wales, although cooling down later in the week when a gusty easterly may develop for Wales and Pennines.