Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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
Monday 22nd December 2025
Last updated
Sun 21st Dec 25 at
4:30PM
Summary for all mountain areas
Strong and gusty SE'ly winds. Rain fairly widely across the Highlands in the morning, easing but leaving patchy drizzle and low cloud shrouding the hills. Low cloud and some drizzly rain for England and Wales, but some breaks for the Lakes, also clearing conditions moving into south Wales.
Headline for Eryri / Snowdonia National Park
Gusty wind easing. A little drizzle, varied low cloud.
How windy? (On the summits)
Southeasterly 30mph with stronger gusts over summits around dawn, gradually easing to 20mph into afternoon.
Effect of the wind on you?
Blustery morning with marked wind chill where exposed to the wind; walking more strenuous in exposure early.
How Wet?
Early rain and drizzle, gradually drying up
Widespread rain from overnight soon breaks into patchy rain and drizzle, mostly concentrated to high tops and east Wales; trending drier.
Cloud on the hills?
Fairly extensive, low bases east Wales
Fairly extensive over high terrain, lowest bases in east Wales, 500-600m or lower for a time in morning. Base tending to rise. Highest bases and some breaks northwestern slopes, though many high tops will struggle to clear.
Chance of cloud free summits?
20%, rising to 40% northwest
Sunshine and air clarity?
Little or no sun. Visibility becomes good out of cloud as morning rain clears; some haze mainly eastern areas.
How Cold? (at 900m)
5C; small variation with height above 500m.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 23rd December 2025
Last updated
Sun 21st Dec 25 at
4:30PM
How windy? (On the summits)
Easterly or variable 10 to 20mph, gradually strengthening afternoon, increasingly gusty, from dusk 30mph.
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, but amounting to little.
Cloud on the hills?
Fairly extensive
High terrain stays in cloud likely all day, lower banks of cloud will come and go which may reach into valley bottoms earlier in the day. Best chance of higher bases/breaks on the slopes near the Llyn Peninsula/Cardigan Bay.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Little or no sun. Good visibility where below cloud; hazier eastern hills.
How Cold? (at 900m)
3C; some western slopes slightly warmer; lowering to 0C into night.
Freezing Level
Above the summits; then dropping close to freezing on some higher slopes into night.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 24th December 2025
Last updated
Sun 21st Dec 25 at
4:30PM
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?
Fairly extensive high tops and east
Cloud banks will cling to the slopes of east Wales above 600-700m, these banks likely pushing up towards the high summits of Snowdonia NP. The highest summits may be just near the tops of the cloud layer. Slopes west of high summits will be largely clear.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Patchy sunshine to the east, more often sunny west. A haze at first but visibility improving.
How Cold? (at 900m)
Around -1C, several degrees warmer western slopes, more widely cool later. Feeling like -13C in direct wind.
Freezing Level
Poorly defined: 700-800m, though warm downslope winds west of the high tops will reduce freezing potential here.
Planning Outlook
Cloud and patchy rain lingers early this week, then a slow change to drier and chiller weather into the Christmas period as high pressure builds to the north. Easterly winds will be dominant, the strongest winds in England and Wales. Cloud may be fairly sheet-like in the east sometimes, though variably more extensive or broken, best northwest. The coldest air will reach England and Wales on the easterly wind with freezing levels reaching as low as 400-600m in Wales, staying slightly warmer in northern Scotland with some inversion conditions likely over higher terrain; frost into glens.