Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
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.
Hazy, some fog banks
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Visibility reduced around cloud banks, hazier on some lower slopes. Locally some improvements possible out of cloud.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
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.
Hazy, some fog banks
Visibility reduced around cloud banks, hazier on some lower slopes. Locally some improvements possible out of cloud.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 23rd December 2025
Last updated
Mon 22nd Dec 25 at
4:08PM
Summary for all mountain areas
A fairly extensive sheet of cloud cloaks eastern Scotland southward down the Pennines and east Wales; some mist and haze, fine drizzle on eastern slopes. Cloud more broken on slopes and summits near west coasts, substantially dry here. An easterly wind south Pennines and Wales, strengthening into night.
Headline for Eryri / Snowdonia National Park
Cloudy and hazy east, some breaks west; blustery in exposure
How windy? (On the summits)
Generally easterly, 15-25mph with stronger gusts on high terrain; some variability in direction, southeasterly earlier and northeasterly later. Into night, gusts may reach up to 35mph.
Effect of the wind on you?
Fairly small, though some noticeable effects in exposure later in the day, may start to affect balance on ridges.
How Wet?
Patchy light rain
Patches of light rain or drizzle drifting around, mostly high eastern areas in cloud, but amounting to little.
Cloud on the hills?
Fairly extensive
Extensive cloud in east Wales likely all day, down to the middle slopes. The high tops of Snowdonia NP may be near or just above the top of the cloud layer. Cloud more broken west of the high tops, though variable here.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Best of sun breaks on low western slopes, little or no sun to the east. Good visibility out of cloud but limited by haze.
How Cold? (at 900m)
3C most slopes, though westernmost slopes will always be at least a few degrees warmer. Lowering several degrees afternoon, reaching 0C overnight.
Freezing Level
Above the summits, then dropping into night through a poorly defined elevation: freezing on some higher slopes though westernmost slopes likely stay above freezing.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 24th December 2025
Last updated
Mon 22nd Dec 25 at
4:08PM
How windy? (On the summits)
A gusty easterly, 35-40mph.
Effect of the wind on you?
Strenuous walking with considerable buffeting in exposure. Expect stability challenges and significant wind chill.
How Wet?
No rain 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 50%
Sunshine and air clarity?
Patchy sunshine to the east at first, increasingly frequent widely. A haze at first but visibility improving.
How Cold? (at 900m)
Around -1C, several degrees warmer western slopes, locally up to 3C. Feeling like -13C in direct wind.
Freezing Level
Poorly defined: 600-700m, though milder downslope winds west of the high tops will reduce freezing potential here.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 25th December 2025
Last updated
Mon 22nd Dec 25 at
4:08PM
How windy? (On the summits)
Easterly 30-35mph from dawn, rising to largely 40mph or higher, strong gusts on high terrain and downslope to the west.
Effect of the wind on you?
Strenuous walking becoming arduous in exposure with considerable buffeting. Significant 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; 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.
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 Wales, lifting somewhat; poorly defined west of high tops due to milder downslope wind.
Planning Outlook
Christmas Eve and Christmas Day will be dry: easterly winds are dominant with the strongest winds in England and Wales. Cloud may be fairly sheet-like in the east sometimes, though variably more extensive or broken, best of breaks in western areas. Turning colder too, the coldest air in England and Wales with freezing levels reaching as low as 400-600m in east Wales. Staying slightly warmer in northern Scotland with some inversion conditions likely over higher terrain; frost into glens and poorly defined freezing levels. High pressure stays put to the north into the weekend, maintaining dry weather, easterly winds, and most cloud in eastern areas. Temperatures will stay chilly.