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.
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.
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.
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.
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
Thursday 11th December 2025
Last updated
Wed 10th Dec 25 at
4:27PM
Summary for all mountain areas
Gale force winds across most hills and mountains, severe gales high Scottish tops particularly morning in west, powerful gusts downslope in places. Low cloud and some drizzly rain west, mostly dry east/northeast. More persistent rain develops for western Scotland afternoon onward.
Headline for Eryri / Snowdonia National Park
Windy, gales on high tops. Patchy cloud, some drizzle mostly west.
How windy? (On the summits)
South-southwesterly 35 to 50mph, gusts in places 60mph higher tops in Snowdon group.
Effect of the wind on you?
Challenging walking conditions, remaining difficult over higher tops, some strong gusts downslope. Considerable wind chill.
How Wet?
Locally damp west, largely dry east/north
Drizzly patches mostly areas on or nearest the Llyn peninsula. Rain then develops from west into night, becoming heavier in west later.
Cloud on the hills?
Patchy cloud mostly western slopes
Banks of cloud linger around some slopes much of day, mainly south-facing areas toward the west. Toward the north of the A5, bases higher and the hills clearer, also good breaks Bala to Berwyn group.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Sun best toward north. Possible haze or mist in places, otherwise visibility good.
How Cold? (at 900m)
4C, slight drop into night. Feeling like -7 to -10C in the wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 12th December 2025
Last updated
Wed 10th Dec 25 at
4:27PM
How windy? (On the summits)
Westerly 20-25mph, a gradual trend towards higher speeds, 30-35mph widely by nightfall, further strengthening.
Effect of the wind on you?
Fairly small most of the day, but winds increasingly uncomfortable in exposure and feeling cool.
How Wet?
Only odd showers west slopes
Rain in east Wales at dawn soon clears. Scattered showers drift onto western slopes from Snowdon southward though most slopes often dry.
Cloud on the hills?
Mostly high terrain and west slopes
Cloud will cling to the upper slopes of Snowdonia with lowest bases on western slopes, may reach as low as 600m during showers. Bases higher east with breaks, at times to summits.
Chance of cloud free summits?
50% east of high tops, 20% west
Sunshine and air clarity?
Cloudy skies early break, best of sun in east Wales and lower slopes. Excellent visibility early, a haze building near the coasts.
How Cold? (at 900m)
2 or 3C. Feeling below freezing in exposure to wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 13th December 2025
Last updated
Wed 10th Dec 25 at
4:27PM
How windy? (On the summits)
Southwesterly, strengthening during daytime from 30-40mph to 50-60mph, risk stronger gusts toward evening.
Effect of the wind on you?
Increasingly challenging walking conditions, mobility becoming difficult on higher exposed tops; significant wind chill.
How Wet?
Small amounts rain, heavier after dark
Patchy spots of rain or drizzle, may be persistently damp west coastal areas, though total rainfall small. Evening into night, increasing risk more persistent steady then heavier rain.
Cloud on the hills?
Most frequent western tops
Cloud banks drifting over higher tops, most frequent on hills near to western coasts. Higher base inland and northward, often above tops north of A5.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Largely cloudy, high cloud thickening. Hazy west, visibility reduced in rain, but more often good toward north/east.
How Cold? (at 900m)
2 or 3C, tending to rise a little later in day. Wind chill feeling around -10C.
Freezing Level
Above the summits.
Planning Outlook
Staying unsettled into the weekend and beyond as southwesterly winds prevail and low pressure systems pass to the northwest of Scotland; sustained gales over the mountains, severe or stormy for periods. Temperatures only just below freezing intermittently on higher Scottish tops, even here will experience spells above freezing with thawing, any lying snow patchy, but beware some icy surfaces on the very highest tops where some refreezing occurs. Rainfall will be frequent and heavy for periods, sometimes showery with hail. Expect very wet ground conditions and further flooding of streams and some rivers.