Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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.
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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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 21st May 2026
Last updated
Wed 20th May 26 at
3:59PM
Summary for all mountain areas
Morning rain in Scotland passes north, afternoon drizzle, rain returns in evening to central/west Munros; slick rock surfaces. Early rain soon clears English hills, afternoon drizzle in Lakeland. Morning drizzle in Wales fades, hills increasingly clear. Strong gusty wind too, local gale-force gusts. Warm Pennines and Wales.
Headline for Eryri / Snowdonia National Park
Strong gusty wind and drizzle; both ease afternoon
How windy? (On the summits)
Southwesterly 35-40mph at dawn, very gusty, most powerful gusts to 50mph including downslope towards Carneddau. Gradually easing with a southerly trending through the day, settling near 20-25mph, lightest mid-Wales.
Effect of the wind on you?
Walking arduous at dawn when powerful buffeting gusts will require effort to maintain stability; notable wind chill despite mild temperatures. Effects ease, but only becoming small late in the day.
How Wet?
Drizzle lifts to high terrain, trending dry
Drizzle from middle slopes up from dawn, lower slopes towards Cardigan Bay, some heavier rain just at and before dawn. Drizzle rises to high terrain and may linger into the afternoon but gradually trending dry with time.
Cloud on the hills?
Extensive, improving afternoon
Cloud shrouds high terrain likely all day, bases down to 300-500m on slopes nearest Cardigan Bay/Llyn Peninsula. North and eastern slopes start shrouded too, but bases lift, as high as 700-800m Carneddau. Cloud increasingly broken through afternoon, chance of clear summits later.
Chance of cloud free summits?
10% rising to 70% afternoon into evening
Sunshine and air clarity?
Largely overcast and dull with poor visibility through morning. Sunny glimpses breaking out afternoon, though weakened by high cloud, better visibility as cloud breaks too.
How Cold? (at 900m)
11C, rising to 13C by evening and staying elevated overnight. Little change with added height. Feeling near freezing in strongest early wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 22nd May 2026
Last updated
Wed 20th May 26 at
3:59PM
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 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
Wed 20th May 26 at
3:59PM
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.
Planning Outlook
Pressure rises into the weekend, facilitating south-southwesterly flow; much milder temperatures arriving, likely warm in England and Wales with wind easing. Staying blustery in north Scotland, gusty too, including to lower slopes early; still feeling chilly on high Scottish tops. Patchy rain and hill cloud will continue to affect Scotland as well, most often in the west. Becoming dry and sunny England and Wales, some early low fog possible, particularly on aspects near the Irish Sea, but this dissipating soon after sunrise. Higher pressure is indicated into next week as well with hot temperatures: valleys approaching the mid-to-high 20s. Some hill cloud, mostly north and west, but most hills seeing plenty of sunshine. Only rare spots of light rain if any.