Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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
Wednesday 3rd December 2025
Last updated
Tue 2nd Dec 25 at
4:10PM
Summary for all mountain areas
Widely breezy, strongest northern England and Scotland, early gales over high Munros; easing but staying blustery northwest Scotland. Showery rain onto west coast slopes down to Wales (snow on high terrain) most of the day, some reaching further east afternoon. Greatest chance of dry weather south Pennines.
Headline for Eryri / Snowdonia National Park
Blustery but easing; showery rain, mostly west
How windy? (On the summits)
Southwesterly 35-40mph in the morning, an easing trend towards 25-35mph afternoon. Significantly deteriorating overnight.
Effect of the wind on you?
Strenuous walking early in the day, stability challenged in exposure. Effects lessening but winds always impeding walking. Feeling cool with significant deterioration of conditions after dark.
How Wet?
Showers west, risk more frequent and east afternoon
Showers drift inland from Cardigan Bay, mostly affecting high tops and western slopes, fewer passing east. Risk becoming more frequent for a time afternoon and reaching further inland.
Cloud on the hills?
Shrouding high tops, lower bases during showers, mostly west
Shrouding the high tops with bases as low as 600m on slopes facing Cardigan Bay during showery periods. More patchy with high bases east Wales, at times clearing summits, though banks returning during showers.
Chance of cloud free summits?
20%, rising to 40% east
Sunshine and air clarity?
Glimpses of sun here and there, slopes nearest Cardigan Bay likely often cloudy. Very good visibility.
How Cold? (at 900m)
2C. Feeling like -10C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 4th December 2025
Last updated
Tue 2nd Dec 25 at
4:10PM
How windy? (On the summits)
Pre-dawn, southerly 40-45mph. Soon westerly 25-30mph, easing further towards 25mph until evening.
Effect of the wind on you?
Arduous conditions around dawn with wind chill will soon start to ease, trending towards fairly small effects.
How Wet?
Some showers west and south
Morning patchy rain passes to the east, giving way to scattered showers off Cardigan Bay. Greatest concentration of showers likely south of Snowdon; substantially dry east and north.
Cloud on the hills?
Improving to banks over high tops
Variable banks of cloud on high terrain, a few lower banks too, tending to clear through morning to just banks over high terrain as showers come and go. An increasing chance of clear summits, particularly east.
Chance of cloud free summits?
Rising to 50%
Sunshine and air clarity?
Glimpses of weak sun through high cloud appearing afternoon. Good visibility though some haze.
How Cold? (at 900m)
0C Feeling like -12C early in the day in the wind.
Freezing Level
900m
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 5th December 2025
Last updated
Tue 2nd Dec 25 at
4:10PM
How windy? (On the summits)
Southerly 30-35mph, rising to 50mph afternoon with gusts over tops up to 60mph+. Easing overnight.
Effect of the wind on you?
Strenuous walking early deteriorates to widely challenging conditions with powerful gusts. Severe wind chill in exposure.
How Wet?
Rain sets in widely from midday
Patchy showery rain/sleet drifts inland from Cardigan Bay early. Rain sets in widely around the midday hours with heavy falls into nighttime.
Cloud on the hills?
Becoming extensive
From dawn cloud likely caps the high tops with banks down towards 700m on western slopes. Many eastern hills clear. Soon lowering widely towards 600-700m as rain arrives, as low as 400m westernmost slopes.
Chance of cloud free summits?
Soon lowering to less than 10%
Sunshine and air clarity?
Overcast. Visibility becomes poor as rain sets in.
How Cold? (at 900m)
1 or 2C, rapidly rising afternoon to 4 or 5C, remaining warmer into night. Feeling like -12C in strong wind.
Freezing Level
700-800m, rising above the summits through morning.
Planning Outlook
Low pressure circulating to the west and north will dominate the weather for the next 7 to 10 days, bringing generally unsettled weather. A brief period of slack pressure on Thursday into Friday will ease winds for a time though patchy rain will linger in several areas. Strong southwesterly winds return over the weekend bringing cloud and rain to many mountains, most persistent on southwestern slopes. Temperatures and freezing level will vary, but staying chilly with highest terrain likely near or below 0C. Several low pressure systems with then pass through next week, brining frequent periods of cloud, rain, and strong wind, likely gale force on high terrain at times. Occasional windows of dry, brighter weather will occur, best chance east.