Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Snow and hail showers
Periods of bright or sunny conditions mixed with showers or flurries of snow and hail. Visibility may change rapidly from excellent to very poor.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Winter kit required on higher terrain
Snow cover over higher mountains. Safe progress over some terrain will require suitable footwear - possibly crampons and ice-axe where necessary.
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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.
Snow and hail showers
Periods of bright or sunny conditions mixed with showers or flurries of snow and hail. Visibility may change rapidly from excellent to very poor.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Winter kit required on higher terrain
Snow cover over higher mountains. Safe progress over some terrain will require suitable footwear - possibly crampons and ice-axe where necessary.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 1st January 2026
Last updated
Wed 31st Dec 25 at
3:55PM
Summary for all mountain areas
Cold north-northwesterly winds, widely gale force over the mountains, difficult conditions with severe chill factor on Scottish high tops. Showery snow and hail frequent in northern Scotland. Rare showers central Scotland and northern England. Early rain and hill snow followed by showers in Wales.
Headline for Eryri / Snowdonia National Park
Windy, up to gale-force tops; showers, snow on hills.
How windy? (On the summits)
Northwesterly 25 to 40mph, strongest higher tops in the north, squally gusts in showers.
Effect of the wind on you?
Strenuous walking, frequent buffeting in exposure higher up, challenging to keep balance on ridges. Significant wind chill.
How Wet?
Early rain, hill snow, then showers with hail
Persistent rain and hill snow above 600-700m from before dawn, clearing southward early morning. Then scattered showers moving in from coasts, falling as snow above 500-600m, possible hail; more frequent evening into night.
Cloud on the hills?
Varied over tops, breaks inland
Cloud fairly extensive on higher slopes from dawn, but lifting with breaks, then varying, but often capping higher slopes, bases 700-900m, lowest most often near coast. Brief breaks higher up more frequent eastward into mid Wales.
Chance of cloud free summits?
30% north/west, to 50% inland/east.
Sunshine and air clarity?
Largely cloudy, some bursts of sun. Visibility varying, very poor in snow and cloud, intermittently very good.
How Cold? (at 900m)
-1 or -2C. Wind chill feeling like -10 to -13C.
Freezing Level
Up to dawn near to freezing to some lower slopes, then rising to 600-800m, highest near the coast.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 2nd January 2026
Last updated
Wed 31st Dec 25 at
3:55PM
How windy? (On the summits)
North-northwesterly 25 to 35mph, squally gusts 40mph at times in showers.
Effect of the wind on you?
Significant wind chill over the mountains. Blustery, buffeting gusts sometimes affecting balance on exposed terrain.
How Wet?
Snow and hail showers
Showers coming inland from northern coasts, most frequent toward the west, risk a more widespread band of snow at first, then showery with hail falling to lower slopes, rain only lower coastal areas.
Cloud on the hills?
Most frequent high tops in north
Often capping higher slopes above 800-900m, patches to 600m mainly on slopes toward coasts in showers. Brief breaks above higher tops, more often mid-Wales.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Brief bursts of sun. Visibility very poor where in snow and cloud, but intermittently very good.
How Cold? (at 900m)
-3 or -4C. Wind chill feeling like -12 to -15C on tops.
Freezing Level
400 to 500m. Soon widely dropping below freezing from valleys upward into evening.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 3rd January 2026
Last updated
Wed 31st Dec 25 at
3:55PM
How windy? (On the summits)
North to northwesterly 25 to 40mph, squally gusts in showers.
Effect of the wind on you?
Continued significant wind chill over the hills, severe highest tops. Frequent buffeting on exposed higher terrain.
How Wet?
Locally frequent snow and hail
Showers over the Irish Sea moving inland from the north, locally banding together to be more frequent, most likely affecting areas toward the Llyn Peninsula, snow and hail often falling to lower slopes.
Cloud on the hills?
Varied over northern tops
Often capping higher tops from Carneddau to Snowdon group, base varied above 700-900m, breaking at times off the tops. Brief lower patches in showers. More often clear southward into mid-Wales.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Bursts of sunshine, more often sunny inland toward mid-Wales. Visibility excellent where dry, but very poor where in snow and cloud.
How Cold? (at 900m)
-4 or -5C. Wind chill feeling like -17C in exposure on high tops.
Freezing Level
300 to 500m, highest near coast, but terrain part-frozen into valleys inland.
Planning Outlook
Terrain extensively frozen onward into the weekend and early next week at least; sub-zero temperatures from the glens upward in Scotland and some valleys inland in northern England. Substantial fresh snow accumulations in the North West Highlands and Cairngorms, heavy showers streaming in from the north also containing hail. Largely dry and sunny from central Scotland to northern England. Hail and snow showers will run into north and west Wales from the sea. Bitter northerly winds, up to gale force higher tops, tending to lessen into Sunday. Some fluctuation of freezing level during next week, but some fronts moving in from northwest likely bring snowfall to hills at times more widely.