Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
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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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 10th December 2025
Last updated
Tue 9th Dec 25 at
4:05PM
Summary for all mountain areas
Storm-force winds continue over Scottish mountains, beware of storm damage and blocked routes. Gales remain severe over high terrain in northern England and tops in north Wales. Showery rain, hail and on higher tops snow in the Highlands, near-constant in the west. Bands of showers northern England, fewer for Wales.
Headline for Eryri / Snowdonia National Park
Upland gales. Rain most frequent west.
How windy? (On the summits)
Southwesterly 40 to 50mph, risk gusts 60mph over higher mountains, tending to moderate a little into afternoon.
Effect of the wind on you?
Challenging walking conditions over the hills, difficult in places on higher terrain; considerable wind chill.
How Wet?
Showers
Showery rain on and off, most frequent western areas. Wet underfoot, streams in spate, some flooding following previous rain.
Cloud on the hills?
Frequently on western high tops
Cloud base varying, but often capping higher summits toward the west, better breaks north and east of Ogwen.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Bursts of sun most frequent toward north/east. Slight haze west, poorer in showers.
How Cold? (at 900m)
3 or 4C, rising slightly into evening-night. Wind chill feeling like -10C.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 11th December 2025
Last updated
Tue 9th Dec 25 at
4:05PM
How windy? (On the summits)
South-southwesterly 35 to 50mph, risk 60mph higher tops in Snowdon group.
Effect of the wind on you?
Challenging walking conditions, likely remaining difficult over higher tops.
How Wet?
Little or no rain
Drizzly patches mostly areas on or nearest the Llyn peninsula. Rain may then develop from west later evening into night.
Cloud on the hills?
Patchy cloud some slopes
Banks of cloud may linger around some slopes much of day, mainly south-facing areas. Toward the north of the A5, more likely the hills clearer.
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, may start to drop into evening or 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
Tue 9th Dec 25 at
4:05PM
How windy? (On the summits)
Westerly 20-25mph, a gradual trend towards higher speeds, near 30mph 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
Planning Outlook
Staying unsettled 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. Driest in eastern areas on Thursday, otherwise rainfall will be frequent and heavy, sometimes showery with hail. Expect wet ground conditions and further flooding of streams and some rivers.