Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday'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.
Very cold
Significant wintry conditions - below freezing from lower elevations up all day, -7 or -8C highest summits, feeling like -20C or below on high tops due to wind chill. Frostbite and hypothermia risk. Substantial protective clothing is 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.
Very cold
Significant wintry conditions - below freezing from lower elevations up all day, -7 or -8C highest summits, feeling like -20C or below on high tops due to wind chill. Frostbite and hypothermia risk. Substantial protective clothing is 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
Saturday 3rd January 2026
Last updated
Fri 2nd Jan 26 at
3:16PM
Summary for all mountain areas
Widespread sub-zero temperatures and wind, gales in northern England and Scotland; wind chill approaching -20C or lower on high summits. Near-constant snow showers in northern Scotland with snowdrifts building; snow showers into central/west Scotland and west Wales too. Mostly sunny southern Scotland and England.
Headline for Eryri / Snowdonia National Park
Snow and hail showers north and west; strong, cold wind
How windy? (On the summits)
North to northwesterly 35 to 40mph in the morning with squally gusts in showers. A slight easing trend with time, speeds nearer 30mph into evening.
Effect of the wind on you?
Significant wind chill over the hills, severe highest tops. Strenuous walking with frequent buffeting on exposed higher terrain, a slight easing of conditions with time in the afternoon.
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, occasional further east towards Carneddau. Snow and hail often falling to lower slopes.
Cloud on the hills?
Varied mostly northern high terrain
Often capping higher tops from Carneddau to Snowdon group, base varied above 800-1000m, breaking at times off the tops. Brief lower patches in heavier snow showers. More often clear southward into mid-Wales, best around Berwyn Group/Bala.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Bursts of sunshine, more often sunny inland toward the Berwyn group. Visibility excellent where dry, but very poor where in snow and cloud.
How Cold? (at 900m)
-4 or -5C; inland valleys starting near -5C as well. Wind chill feeling like -20C in exposure on high tops early in the day.
Freezing Level
300 to 500m, highest near coast, but terrain part-frozen into valleys inland. Will drop to valley level overnight well-inland.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 4th January 2026
Last updated
Fri 2nd Jan 26 at
3:16PM
How windy? (On the summits)
Northwesterly 20-25mph, squally gusts in showers. Some higher speeds over high ground possible late in the day.
Effect of the wind on you?
Continued significant wind chill over the hills, severe highest tops. Ease of walking affected with buffeting, may deteriorate.
How Wet?
Snow and hail becoming frequent
Irish Sea showers move onto western slopes in the morning, gradually falling more widely into the Carneddau area and widely across Snowdonia NP. Showers only reaching Berwyn group later.
Cloud on the hills?
Increasingly shrouding high terrain
Capping higher tops from Carneddau to Snowdon group, base varied above 700-900m, a few higher breaks early. Bases lower in showers, and bases to middle slopes increasingly widely across Snowdonia NP.
Chance of cloud free summits?
50% lowering to 20%
Sunshine and air clarity?
Bursts of sunshine, mostly east, trending cloudier. Visibility excellent where dry, but increasingly very poor in snow and cloud.
How Cold? (at 900m)
-4C. Wind chill feeling like -17C in exposure on high tops.
Freezing Level
Terrain widely frozen down to valleys well inland; up to 300m northwest of Snowdon.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 5th January 2026
Last updated
Fri 2nd Jan 26 at
3:16PM
How windy? (On the summits)
Northerly 25-30mph.
Effect of the wind on you?
Continued significant wind chill over the hills, severe highest tops where walking becomes strenuous with buffeting.
How Wet?
Snow showers, mostly west
Irish Sea showers come and go onto Snowdon and mountains to the west, occasional more broadly north of A5 too. Fewer showers, if any, reaching Berwyn group.
Cloud on the hills?
Variable, most extensive northern high ground
Capping higher tops from Carneddau to Snowdon group, base varied above 800-900m, a few higher breaks but also lowering in showers. Towards Berwyn group, any cloud fleeting on high tops, if any.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Bursts of sunshine to the south and east, may be largely cloudy near the coasts. Visibility excellent where dry, but very poor in snow and cloud.
How Cold? (at 900m)
-4C. Wind chill feeling like -17C in exposure on high tops.
Freezing Level
Terrain widely frozen down to valleys well inland; up to 200m near coastal slopes, highest towards the north.
Planning Outlook
Terrain extensively frozen into early next week; sub-zero temperatures from the glens upward in Scotland and increasingly into valleys in England and Wales. Heavy showers streaming into northern and coastal Scotland, some containing hail, most terrain covered in snow with substantial snowdrifts in the Northwest Highlands and Cairngorms. Largely dry and sunny in southern Scotland and England. Hail and snow showers will run into north and west Wales from the sea. Bitter northerly winds, up to gale force higher tops at times. More variable next week: some fluctuation of freezing level during next week, though most high terrain stays sub-zero, and as fronts come in from the west, upland snowfalls are possible more widely.