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.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
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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.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 24th December 2025
Last updated
Tue 23rd Dec 25 at
3:44PM
Summary for all mountain areas
Patchy cloud on middle and high slopes of central and east Scottish Highlands, clearer west and north; high summits clear too. Most cloud in England stays east of the Pennines, little west including Lakeland where isolated to summits. Gusty wind in Wales, risk gales south; early cloud in the east will break.
Headline for Eryri / Snowdonia National Park
Windy, strong downslope gusts, morning cloud east will break
How windy? (On the summits)
A gusty easterly, 30-35mph, some downslope gusts to the west may be quite strong, particularly south of Snowdonia NP.
Effect of the wind on you?
Strenuous walking with considerable buffeting in exposure. Expect stability challenges and significant wind chill.
How Wet?
No precipitation expected
Cloud on the hills?
Early cloud high tops and east, improving
Early cloud in east Wales above 600-700m, these banks likely pushing up towards the high summits of Snowdonia NP though these may be just near the tops of the cloud layer. Slopes west of high summits will be largely clear, increasingly clear east.
Chance of cloud free summits?
30% rising to 70%
Sunshine and air clarity?
Patchy sunshine to the east at first, increasingly widespread. A haze at first but visibility improving to very good.
How Cold? (at 900m)
-1C or cooler in the morning, several degrees warmer western slopes, locally up to 3C where in sun, but trending cooler here as well. Feeling like -13C in direct wind.
Freezing Level
Poorly defined: 600-700m, though milder downslope wind west of the high tops will reduce freezing potential here. The very highest tops may be above freezing too.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 25th December 2025
Last updated
Tue 23rd Dec 25 at
3:44PM
How windy? (On the summits)
Easterly 35mph from dawn, rising to largely 45mph with powerful gusts on high terrain and downslope to the west.
Effect of the wind on you?
Strenuous walking becoming arduous in exposure with considerable buffeting. Severe wind chill.
How Wet?
No rain expected
Cloud on the hills?
Mostly high terrain east Wales
Banks of cloud on the middle and upper slopes of east Wales with a breaking trend as the day goes, most persistent Carneddau to Berwyn; highest tops in Snowdonia NP may be above the cloud layer. Westernmost slopes likely stay clear.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Patchy sunshine in east Wales, more extensive westernmost slopes. Excellent visibility, some early haze.
How Cold? (at 900m)
-3C early, rising slightly; always at least a few degrees warmer westernmost slopes. Feeling as cold as -15C in direct wind.
Freezing Level
Around 300-400m east, some valley frost early; poorly defined west due to milder downslope wind.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 26th December 2025
Last updated
Tue 23rd Dec 25 at
3:44PM
How windy? (On the summits)
Easterly 25 to 40mph, stronger gusts around some tops and high passes; locally also gusty downslope west of high tops.
Effect of the wind on you?
Strenuous walking with considerable wind chill in exposure over high terrain, in places buffeting gusts affecting balance.
How Wet?
Precipitation rare if any
Chance of brief snow grains or light rain spots lower down, mainly toward east.
Cloud on the hills?
Risk often capping tops north/east
Patchy cloud mostly above 700-800m, most common onto tops from Carneddau group around to Bala, may persist locally. More often clear hills toward west coast.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Mix of cloud and sun, best in west, often sunny near to Cardigan Bay. Visibility good, though some haze likely.
How Cold? (at 900m)
0 or -1C, small variation with height. Feeling like -10 to -15C directly in the wind.
Freezing Level
Near freezing all elevations from dawn, staying mostly sub-zero above 600m, but above freezing some western slopes.
Planning Outlook
Christmas Day will be dry: easterly winds are dominant, strongest in England and Wales and most cloud east of the high tops: may be fairly sheet-like sometimes, though variably more extensive or broken, best of sun breaks in western areas. Turning cooler too, the coldest air in England and Wales with freezing levels reaching as low as 300-600m in east Wales, though poorly defined. High pressure stays put to the north into the weekend, maintaining dry weather, easterly winds, and mixed cloud and sunshine, most of the cloud in eastern areas. Temperatures will be variable, becoming milder for a time in England and Wales, with poorly defined freezing levels.