Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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.
Click an icon for more information or click here for a key to all icons.
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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
Friday 12th December 2025
Last updated
Thu 11th Dec 25 at
3:43PM
Summary for all mountain areas
Increasingly blustery north England and Scotland, gales over Scottish Highlands; lighter wind Pennines and Wales. Early patchy rain over east Scotland and the Pennines soon clears, slowest south Pennines; many hills then cloud-free. Scattered showers onto west coasts, most frequent and heavy west-central Scotland.
Headline for Eryri / Snowdonia National Park
Cloud and showers west; often clear east; breezy later.
How windy? (On the summits)
Westerly 20-25mph, though lighter pre-dawn. a gradual trend towards higher speeds, 30-35mph widely by nightfall.
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, mostly south of Snowdon, 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, though weakened by some high cloud. 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
Thu 11th Dec 25 at
3:43PM
How windy? (On the summits)
Southwesterly, strengthening during daytime from 30-40mph to 45-55mph, 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, more overnight
Patchy spots of rain or drizzle, may be persistently damp west coastal areas, though total rainfall small. Evening into night, increasing risk more frequent 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?
Early sunshine inland, high cloud gradually building through the day. 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, 5C overnight. Wind chill feeling around -10C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 14th December 2025
Last updated
Thu 11th Dec 25 at
3:43PM
How windy? (On the summits)
A gusty southwesterly, sustained winds between 45-55mph, may strengthen further. Gusts to middle slopes.
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. Drier east Wales and around the Ogwen Valley, though some patches drifting here too.
Cloud on the hills?
Shrouding high terrain with low bases west
Cloud cloaks the high terrain of Snowdonia NP with bases down to middle western slopes, at time reaching down to 500m. Higher bases east/Carneddau, may reach near tops though any summit breaks will be fleeting.
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 to 7C, variable. Little change with added height. Feeling like -5 to -8C in direct wind.
Freezing Level
Above the summits
Planning Outlook
Staying unsettled through the weekend and 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. Rainfall will be frequent and heavy for periods, sometimes showery with hail in the west. Expect very wet ground conditions and further flooding of streams and some rivers. Best chance for dry and bright periods central and south Pennines, though these fleeting. 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.