Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
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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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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
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 12th January 2026
Last updated
Sun 11th Jan 26 at
1:43PM
Summary for all mountain areas
Extensive upland gales, although storm force at first N Scotland. Bands of showers, of hail, and snow higher areas, will merge to give periods of almost constant precipitation on many western mountains. Small risk thunder. Driest conditions will be on easternmost mountains and S Wales.
Headline for Eryri / Snowdonia National Park
Gale force upland wind. Rain (hail and snow higher tops); fog.
How windy? (On the summits)
Southwesterly 40 to 50mph, strongest higher tops Snowdon range.
Effect of the wind on you?
Walking widely difficult on higher areas, frequent buffeting even lower elevations. Significant wind chill.
How Wet?
Showers; sometimes very frequent, particularly Snowdon range
Frequent showers, particularly Snowdon range where precipitation may be almost constant for an hour or two; hail and on higher tops wet snow. Fewest showers easternmost summits. Very wet underfoot west Wales due to previous rain and snow melt.
Cloud on the hills?
Often covering western tops
Covering areas above 600m extensively, and in rain cloud base sometime below 300 or 400m. In mid Wales, breaks above 750m and rarely cloud below 500m.
Chance of cloud free summits?
Almost nil, but 40% mid Wales
Sunshine and air clarity?
Glimpses of sun, mainly mid Wales. A general haze, visibility poor in rain.
How Cold? (at 900m)
4C. Will feel as cold as -10C where exposed to the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 13th January 2026
Last updated
Sun 11th Jan 26 at
1:43PM
How windy? (On the summits)
Forecast confidence remains low: Generally south 30 to perhaps 40mph, but speeds may be lower or drop from west.
Effect of the wind on you?
Walking on higher areas may well be arduous most or all day and wind chill considerable.
How Wet?
Rain may become incessant
Rain may well fall most or all day - although drier conditions to the west may penetrate across Wales (very uncertain).
Cloud on the hills?
Blanket of low cloud probable; cloud base may rise or have risen from west
Cloud may well fill in or have filled in across the hills in rain. There may be improvement from the west but this very uncertain.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Little or no sunshine. Widely misty or murky in rain.
How Cold? (at 900m)
4C
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 14th January 2026
Last updated
Sun 11th Jan 26 at
1:43PM
How windy? (On the summits)
West backing southerly around 25mph before later in day strengthening to 40-50mph.
Effect of the wind on you?
May well be fairly small for several hours before walking.becomes increasingly difficult and wind chill significant.
How Wet?
Risk of snow an hail showers
A few showers may come in off the sea giving hail and snow, although rain lower particularly coastal slopes. Threat precipitation setting in late in day.
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. Visibility often very good, but poor in snow.
How Cold? (at 900m)
-2C
Freezing Level
700m coastal hills; otherwise 600m.
Planning Outlook
High rainfall and intermittently windy across most mountains over the next week or more as a series of Atlantic lows cross Britain. With uncertainty in the tracks of some lows, Tuesday's forecast remains very uncertain - but by Wednesday a transient weak ridge of high pressure will bring a brief improvement. Higher summits sometimes below freezing point S Scotland southwards: snow may accumulate on highest summits. Mostly below freezing Scottish Highlands enabling snow to accumulate widely.