Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
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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.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 20th May 2026
Last updated
Tue 19th May 26 at
4:10PM
Summary for all mountain areas
Windy with strong gusts, briefly lighter early in Scottish Highlands. Morning showery rain and low cloud; improving afternoon as patchy sun breaks out, cloud lifting to high terrain with summit breaks, and most areas substantially dry by later afternoon. Low cloud lingers in Wales and NW Scotland.
Headline for Eryri / Snowdonia National Park
Windy, powerful gusts; morning rain, lingering cloud west
How windy? (On the summits)
West-southwesterly 30-35mph, gusty over high terrain, particularly early when may reach 40mph. A slight easing trend with time towards 30mph, some stronger gusts over tops remains.
Effect of the wind on you?
Walking impeded in exposure and often strenuous and feeling chilly; considerable buffeting possible over high terrain, some balance challenges; a slight easing later.
How Wet?
Morning showery rain, mostly dry afternoon
Showery rain driving in from the west through morning, a lingering drizzle on tops and west slopes. Rain mostly eases early-to-mid afternoon, just a slight drizzle, and only odd spots of rain by evening.
Cloud on the hills?
Fairly extensive, particularly west, perhaps more broken afternoon
A sheet of cloud shrouds the hills at dawn, to lower western slopes. Bases slowly lift towards 700-800m east of high terrain by later afternoon; bases stay low on western slopes, may not clear much above 500m until late. A few later afternoon hours may see the cloud more broken.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Glimpses of sun, a chance of longer bursts afternoon. Visibility starts poor, improving east as cloud and rain ease.
How Cold? (at 900m)
5 or 6C at dawn, rising to 8C, or locally 9C on sun exposed eastern areas. Only slight drop in temperature into night. Feeling just below freezing in strongest wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 21st May 2026
Last updated
Tue 19th May 26 at
4:10PM
How windy? (On the summits)
South-southwesterly 35-40mph. Gusty over the high tops, powerful downslope gusts early too, to 45mph.
Effect of the wind on you?
Walking strenuous to arduous with considerable buffeting often challenging stability in exposure. Feeling cool.
How Wet?
Drizzle lifts to high terrain
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 lingering well into the day west slopes. A few spots of rain may pass east.
Cloud on the hills?
Extensive
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. May break up more late in the day.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Largely overcast and dull with poor visibility. Some chance of sunny glimpses later in the day, best north and east.
How Cold? (at 900m)
10 to 12C, approaching 13C by evening. Feeling near freezing in strongest wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 22nd May 2026
Last updated
Tue 19th May 26 at
4:10PM
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)
13 or 14C; rising to a warm 22C in the valleys. Feeling near 5C in early strong wind.
Freezing Level
Above the summits.
Planning Outlook
Pressure rises as the weekend approaches, facilitating south-southwesterly wind; much milder temperatures arriving, likely warm in England and Wales by the weekend. Blustery wind for a few days, quite gusty too, including to lower slopes early; still feeling chilly on high Scottish tops, and strongest gusts will challenge stability. Patchy rain and hill cloud will continue to affect Scotland as well, most often in the west. Increasingly dry and sunny England and Wales, but always with a risk of cloud and some rain, including early valley mist in sheltered areas. Higher pressure is indicated into next week as well. Precise detail of the high pressure core remains uncertain - the risk of strong wind and spells of rain possible for most areas, but also extended bright and warm periods too.