Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today'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 near or just above freezing 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 near or just above freezing 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 27th March 2025
Last updated
Wed 26th Mar 25 at
2:33PM
Summary for all mountain areas
Widespread upland severe gales and rain across Scotland - although breaks in the rain some eastern and far northern areas (sometimes snow higher tops far north). South into England and Wales, less windy, particularly morning and away from hills open to the sea to the southwest, very little if any rain.
Headline for Eryri / Snowdonia National Park
Increasingly windy - upland gales developing; chance drizzle western hills.
How windy? (On the summits)
Southwesterly 25 to later 35mph, but on Snowdon range 40mph - possibly 55mph higher tops late in day.
Effect of the wind on you?
Increasingly strenuous walking on higher exposed terrain, affecting balance on tops and ridges. Marked wind chill.
How Wet?
Patches rain and drizzle
Occasional drizzly rain western mountains - perhaps isolated apart from between Snowdon and Lleyn peninsula.
Cloud on the hills?
Extensive on higher areas
Blanket low cloud much of the day, shrouding hills to lower elevations in west coastal areas, widely 500m well inland - although mostly above 700m easternmost summits and near and north/east of Ogwen valley.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Sunshine unlikely near the west coast; pockets of sun elsewhere, fairly widely easternmost hills. Very good or excellent visibility, but poor in rain.
How Cold? (at 900m)
4C. Feeling below-5C on higher tops afternoon.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 28th March 2025
Last updated
Wed 26th Mar 25 at
2:33PM
How windy? (On the summits)
Westerly 35mph or in mid Wales, 30mph; squally near showers.
Effect of the wind on you?
Considerable wind chill. Frequent buffeting, especially near precipitation.
How Wet?
Hail showers, risk lightning
Hail and snow showers, mainly afternoon, risk isolated thunder. Precipitation mostly rain below 600m.
Cloud on the hills?
Frequently covering higher tops.
Cloud base changing in and out of showers: mostly above 700m, clearing most tops periodically (especially east Wales), but patches below 500m in showers.
Chance of cloud free summits?
30% west to 70% east Wales
Sunshine and air clarity?
Patchy sun, mainly east Wales. Slight haze.
How Cold? (at 900m)
0C. Will feel as cold as minus 10C directly in the wind.
Freezing Level
900m
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 29th March 2025
Last updated
Wed 26th Mar 25 at
2:33PM
How windy? (On the summits)
Westerly 15 or 20mph, perhaps occasionally 25mph higher tops Snowdon range, particularly toward evening.
Effect of the wind on you?
Mostly small.
How Wet?
Little or no rain
Substantially dry. But may turn drizzly toward evening most likely between Snowdon and Lleyn peninsula.
Cloud on the hills?
Probably extensive on highest tops
Cloud base typically 600 to 900m by late morning (lowest westernmost summits). Will probably lower, most pronounced western mountains toward evening, where below 400m.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Patches of sunshine, mainly east Wales will tend to give way as cloud thickens afternoon. Very good or excellent visibility.
How Cold? (at 900m)
0 rising to 3C.
Freezing Level
900m at first; above the summits by midday.
Planning Outlook
Frequently windy with intermittent rain (or widely snow and hail showers on Friday) until early next week. Pressure is then likely to build markedly over and east of Britain, bringing the return of dry and sometimes warm and sunny weather for much of next week.