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.
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.
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 14th January 2026
Last updated
Tue 13th Jan 26 at
3:57PM
Summary for all mountain areas
Cold westerly winds, backing southerly and strengthening ahead of a front which will move into western Scotland during the afternoon, with snow setting in for western mountains, patchier further east. Ahead of this front, scattered snow showers. Mostly dry for England and Wales until front edges precipitation into west later.
Headline for Eryri / Snowdonia National Park
Mostly dry, but winds backing southerly and strengthening. Risk snow later in day.
How windy? (On the summits)
West backing southerly 20-25mph in a lull after dawn. Will progressively strengthen hour by hour to reach 40-50mph around or after dusk, strongest west Wales.
Effect of the wind on you?
Fairly small morning. Then walking increasingly difficult and wind chill becoming significant.
How Wet?
Mostly dry, until later in day.
Mostly dry, but the threat of snow, rain lower slopes, setting in late in day from west, mainly by or after dusk.
Cloud on the hills?
Probably remaining extensive on most or all higher areas
Cloud sometimes forming below 450m near the coast, but cloud base generally rising to 600 to 800m - possibly a few breaks to higher summits, mainly east Wales. Cloud base may drop markedly later in day.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Occasional sunshine, mainly well inland morning. Becoming overcast. Visibility often very good, but poor in snow.
How Cold? (at 900m)
-1C. Directly in wind will feel as cold as minus 12C.
Freezing Level
800m coastal hills; otherwise 700m. Frost many valleys after dawn.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 15th January 2026
Last updated
Tue 13th Jan 26 at
3:57PM
How windy? (On the summits)
South to southwesterly 25mph. Uncertainty later in day: There may be a pronounced lull but could strengthen markedly toward dusk.
Effect of the wind on you?
Mostly fairly small.
How Wet?
Risk showers
Most likely though extensively dry. But some uncertainty: chance showers morning west Wales, and of persistent rain late in day (snow higher slopes).
Cloud on the hills?
May well clear most summits
Cloud base likely to lift toward 900m widely, possibly sometimes clearing higher tops. Risk though in precipitation of cloud filling in extensively across the hills.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Patches of sunshine - may give way to thickening cloud. Visibility excellent but very poor in precipitation.
How Cold? (at 900m)
0 or 1C
Freezing Level
900 or 1000m.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 16th January 2026
Last updated
Tue 13th Jan 26 at
3:57PM
How windy? (On the summits)
Low confidence in track of small scale low. Risk westerly 40 to 60mph early in day, becoming southerly 30mph.
Effect of the wind on you?
High uncertainty over track of small scale low. Risk early in day of difficult conditions with significant wind chill, then easing.
How Wet?
Overnight rain/snow, then showers.
Risk of heavy snow during the early hours, perhaps down to 500m, but this precipitation will likely have cleared by dawn leaving showers, snow on tops.
Cloud on the hills?
Fairly extensive, best breaks north.
Cloud very likely fairly extensive across the hills, following the overnight rain and snow. Best breaks across northern most tops. General bases around 600-800m.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Little or no sun. Visibility good or very good away from showers.
How Cold? (at 900m)
0C
Freezing Level
900m, but may have been as low as 600m overnight.
Planning Outlook
Very uncertain forecast late Thursday and into Friday, as a small scale and rather potent low pressure system edges northwards across the country on a very uncertain track. May bring a spell of strong winds and upland heavy snowfall overnight and into Friday morning before pulling away to the east. Thereafter, a drier and chilly weekend will follow. Looking further ahead, a colder continental influence may be drawn in on south to east winds, with the snow pack across the Scottish Highlands being enhanced by further spells of snowfall where fronts edge in from the west, whilst further south snow accumulates on higher areas, and occasional falls reach lower slopes.