Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
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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Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
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
Thursday 25th December 2025
Last updated
Wed 24th Dec 25 at
4:20PM
Summary for all mountain areas
Dry with sunshine best in west and northern Scotland, high terrain warmer than many lower slopes, local low-level fog. High summits SE Highlands likely just above patchy cloud. Mostly cloudy Pennines, grazing tops, clearer westward across the Lakes. Gusty easterly winds, strongest further south, gale-force in Wales.
Headline for Eryri / Snowdonia National Park
Gale-force gusty wind, severe chill. Sunshine, patchy cloud.
How windy? (On the summits)
Easterly 35mph from dawn, rising to largely 45mph with powerful gusts on high terrain and downslope to the west, strongest speeds and gusts particularly toward mid-Wales, often over 50mph near Cader Idris.
Effect of the wind on you?
Strenuous walking becoming arduous in exposure with considerable buffeting, often knocking you off balance in places, not just on highest terrain. Severe wind chill.
How Wet?
Dry all day
Cloud on the hills?
Mostly high terrain east/north areas in the morning
Patchy cloud some middle and upper slopes, mostly in morning Carneddau to Berwyn/Bala but a breaking trend as the day goes; highest tops in Snowdonia NP just above cloud patches. Westernmost slopes likely stay clear.
Chance of cloud free summits?
50% north/east morning; rising to 90% all areas.
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 400m east, some valley frost where sheltered early. In west, poorly defined due to milder downslope wind, near freezing some slopes around 600m.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 26th December 2025
Last updated
Wed 24th Dec 25 at
4:20PM
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.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 27th December 2025
Last updated
Wed 24th Dec 25 at
4:20PM
How windy? (On the summits)
Easterly 30 to 40mph, very gusty around some tops, high passes and downslope toward the west.
Effect of the wind on you?
Affecting comfortable walking and balance over tops and ridges, sudden buffeting gusts in places; considerable wind chill.
How Wet?
Rare if any light rain
Largely dry; chance of an odd brief spot of light rain mainly eastern hills.
Cloud on the hills?
Mostly high tops toward north/east
Some cloud banks mostly above 700m and in areas from Carneddau to hills near Bala; patchier westwards, often clearing. Highest tops may be near top of cloud layer.
Chance of cloud free summits?
60% north/east, 80% near west coast.
Sunshine and air clarity?
Fairly cloudy, but some sun mainly toward west. Visibility very good.
How Cold? (at 900m)
1 to 3C, but slightly warmer on highest summits and some western slopes. Feeling like -10C directly in the wind.
Freezing Level
Some terrain partly frozen; close to freezing some upper slopes and patchy slight frost in sheltered valleys in morning.
Planning Outlook
Dry weather continues into the weekend as a strong area of high pressure resides near or north of Scotland. Inversion conditions Scottish mountains, high tops generally above freezing and above most patchy cloud, some frost and fog in glens. Gusty east-northeasterly wind increasing for Scotland by Saturday, easing again for Sunday. Strong and gusty winds prevail for England and Wales, often cloudy, a little light rain occasionally Pennines; some sun toward west. Next week stays dry for many, local showers northern Scotland, possibly turning chillier with northerly winds. *** Wishing you a very happy Christmas and New Year from all the team at MWIS ***