Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra 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.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 24th September 2026
Last updated
Wed 23rd Sep 26 at
4:27PM
Summary for all mountain areas
Southerly gales develop widely over Scottish mountains, becoming severe northwest coastal tops. A little rain moves northeast, then more persistent rain sets in for western mountains, turning heavier. Wind strengthens too for England & Wales, generally dry and hills clear, sun giving way to a veil of upper cloud.
Headline for Eryri / Snowdonia National Park
Increasingly blustery; dry, mostly clear, local mist/cloud patches.
How windy? (On the summits)
Southerly 20-25mph, tending to strengthen to 30-35mph and gusty over high tops, increasing downslope too.
Effect of the wind on you?
Increasingly blustery in exposure, gusts affecting stability, not just on high terrain.
How Wet?
Any rain unlikely
Rare spots from thickening cloud over western hills toward Cardigan Bay. Turning more persistently drizzly over west coast hills into night.
Cloud on the hills?
Little or none until later
Mist in some sheltered valleys around dawn, this soon lifting and dissipating for clear hills. Odd patches may skim western tops during afternoon. Varied cloud then into night may lower over western hills.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Sun through high cloud, patchy cloud drifting in from west. Very good visibility.
How Cold? (at 900m)
8C rising to 11C, staying elevated overnight.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 25th September 2026
Last updated
Wed 23rd Sep 26 at
4:27PM
How windy? (On the summits)
Westerly or variable 10-15mph or less, but at dawn 20-25mph and rising a little again toward evening.
Effect of the wind on you?
Mostly small.
How Wet?
Rain mostly west, may fade
Drizzly rain from before dawn in west, soon fairly persistent rain northwestern areas, tending to fade a little with time. Further south and east likely drier early in day, then occasional rain.
Cloud on the hills?
Most persistent west
Some cloud or fog banks from lower elevations inland in the morning, tending to disperse or lift onto higher slopes. Most persistent west Snowdon/Yr Wyddfa group above 600-800m in rain, breaks east.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Largely cloudy. Some early misty low cloud, visibility reduced in rain, poor toward west, better if dry east/mid Wales.
How Cold? (at 900m)
Around 10C, little change all day.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 26th September 2026
Last updated
Wed 23rd Sep 26 at
4:27PM
How windy? (On the summits)
Southwesterly 20 to 30mph, sustained speeds tending to rise during afternoon, may gust 40mph later high tops.
Effect of the wind on you?
Increasingly blustery, affecting comfortable walking particularly afternoon on high terrain, feeling cool in exposure on tops.
How Wet?
A little rain in west
Some light showery rain occasionally mainly toward west coast, odd light showers elsewhere, but more often dry inland and eastern areas.
Cloud on the hills?
Capping some tops, then lifting
Patchy cloud drifts over some higher slopes above 700-800m toward the west coast in the morning, tending to lift higher and break above most tops with time.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Glimpses of sun west, more frequent north and eastern areas. Hazy toward west coast, but visibility very good further north and east.
How Cold? (at 900m)
7C rising to 9C. Feeling near to 0C in the wind.
Freezing Level
Above the summits.
Planning Outlook
South to southwesterly winds prevail onward into the weekend and next week. Some rain drifting in from the Atlantic, a mix of drizzle, some showery falls, and locally steadier rain at times over western mountains. Cloud often shrouding hills, best of breaks toward east and north. Generally mild air, but prepare for marked chill factor on tops due to often strong winds, gales for periods over high terrain, most sustained in Scotland. Into mid-next week, risk of a more widespread gale, or severe gale over higher mountains. Higher pressure then tends to expand further over the country into the start of October for drier and quite warm weather.