Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday'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
Saturday 13th December 2025
Last updated
Fri 12th Dec 25 at
4:13PM
Summary for all mountain areas
Increasingly severe conditions Scottish Highlands: gusty storm-force winds on high terrain and becoming wet from the west. Gales in England and Wales, severe from Snowdonia towards Lakeland/north Pennines; drizzly rain on western slopes, patches drifting east. Driest south Pennines.
Headline for Eryri / Snowdonia National Park
Wind strengthens, severe gales in exposure; damp west slopes
How windy? (On the summits)
Southwesterly, strengthening during daytime from 35-40mph to 45-55mph afternoon, strongest gusts over tops up to 60mph+, staying strong into nighttime.
Effect of the wind on you?
Increasingly challenging walking conditions, mobility becoming difficult on higher exposed tops with powerful gusts; significant wind chill.
How Wet?
Small amounts of rain west, more overnight
Patchy spots of rain or drizzle, may be often damp west coastal areas and high tops, though total rainfall small. Increasing risk more frequent rain overnight hours.
Cloud on the hills?
Mostly high and western terrain
Cloud banks drifting over higher tops, most frequent on hills near to western coasts where bases often down to 600-700m. Higher base inland and northward, at times breaking above tops north of the A5.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Early sunshine inland, high cloud gradually building through the day. Hazy west, visibility reduced in rain, but more often good toward east.
How Cold? (at 900m)
3 or 4C, tending to rise a little late in day and overnight, 5C or locally 6C north of the A5. Wind chill feeling around -10C later.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 14th December 2025
Last updated
Fri 12th Dec 25 at
4:13PM
How windy? (On the summits)
A gusty southwesterly, sustained winds between 45-55mph, risk strengthening, gusts up to 65mph.
Effect of the wind on you?
Strong gusty winds will challenge balance and stability all day, including less exposed slopes. Significant wind chill.
How Wet?
Patchy rain
Often drizzly on the high tops from Snowdon southward with some patchy rain coming and going, increasingly likely with time. Drier towards Bala.
Cloud on the hills?
Variable: shrouding high terrain, lowest west
Cloud cloaks the high terrain of Snowdonia NP with bases down to middle western slopes, at time reaching down to 500-600m. Higher bases east/Carneddau, but also filling in.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Little or no sunshine; dull on high terrain with haze near the west coast. Better visibility out of cloud east.
How Cold? (at 900m)
5 or 6C, variable. Little change with added height. Feeling like -5 to -8C in direct wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 15th December 2025
Last updated
Fri 12th Dec 25 at
4:13PM
How windy? (On the summits)
Southwesterly 30-40mph from dawn, perhaps easing to 20mph or less though this uncertain.
Effect of the wind on you?
Strenuous walking in the morning and perhaps all day; feeling chilly. May ease to small effects.
How Wet?
Rain most of the day
Often raining widely, most persistent western slopes and high terrain of Snowdonia with heavy falls near the coast.
Cloud on the hills?
Fairly extensive
Shrouding the high tops with variable banks regularly drifting down to 700m, lower west where risk reaching lower slopes during heavier moments of rain.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Little or no cloud, often dull west. Visibility variable, often poor.
How Cold? (at 900m)
3 or 4C. Feeling like -5C in strongest early wind.
Freezing Level
Above the summits
Planning Outlook
A brief spell of drier-brighter weather on Tuesday, but otherwise staying unsettled into next week as southwesterly winds prevail and low pressure systems pass to the northwest of Scotland; sustained gales over the mountains, severe or stormy for periods. Bands of rain will regularly pass eastward across most areas, showery in the west between wetter spells with hail at times. Expect very wet ground conditions and further flooding of streams and some rivers. Mild for the time of year, 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. Detail becomes very uncertain after next weekend though temperatures likely to drop.