Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday'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.
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.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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
Saturday 26th September 2026
Last updated
Fri 25th Sep 26 at
4:30PM
Summary for all mountain areas
Strong southwesterly winds, gale-force on Scottish mountains, strengthening in the west. Showery rain and cloud banks in western Scotland, patchy rain extending inland. A little rain in the wind at times and some cloud on western hills of England and Wales, more often dry and less wind further south.
Headline for Eryri / Snowdonia National Park
Breezy on high terrain; often dry, cloud varied on western tops.
How windy? (On the summits)
Southwesterly 20 to 30mph, typically strongest toward north of the region, speeds varying a little during the day, tending to rise toward evening.
Effect of the wind on you?
Blustery, strenuous walking over exposed higher terrain, some buffeting gusts and feeling rather cool around high 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 tops mostly west
Patchy cloud drifts over some higher slopes above 700-800m toward the west coast in the morning, tending to lift higher, breaking above tops to the north and east with time. Slopes facing Cardigan Bay will often have banks clinging to higher elevations.
Chance of cloud free summits?
60%, rising to 80% north/east
Sunshine and air clarity?
Glimpses of sun west, more frequent north and east from Ogwen valley. 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.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 27th September 2026
Last updated
Fri 25th Sep 26 at
4:30PM
How windy? (On the summits)
Southerly 30-40mph, risk abruptly reaching 50-60mph with violent gusts for an hour or so middle of day; later W-SW'ly.
Effect of the wind on you?
Strenuous walking, for a time for difficult mobility over exposed terrain, challenging gusts widely; notable wind chill.
How Wet?
Heavy thundery rain for a time
Mostly dry start, then rain develops quickly, setting in for several hours, a swathe of heavy rain likely into middle of day, briefly torrential, risk thunder. Breaking into showers afternoon, mostly in west. Drier toward evening.
Cloud on the hills?
Clear early hours, then covering high terrain
Little or no cloud on hills at first. Patches starting to lower onto tops, suddenly filling in over high terrain afternoon, and lowering towards 500m locally during heaviest rain. Lifting again later.
Chance of cloud free summits?
80% lowering to 20% in rain
Sunshine and air clarity?
Early weak sun soon gives way to overcast skies; brightening up again later in day. Very good visibility, deteriorating with cloud/rain, poor for a time.
How Cold? (at 900m)
9 or 10C, rising a degree afternoon, then notably cooling into night. Feeling like 0C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 28th September 2026
Last updated
Fri 25th Sep 26 at
4:30PM
How windy? (On the summits)
West-southwesterly 10 to 20mph, strongest on northern tops in morning.
Effect of the wind on you?
Mostly small.
How Wet?
Rain unlikely
Cloud on the hills?
Local patches lift and clear
Some patchy cloud in the morning mainly on south-facing slopes near to coasts, plus local mist in some valleys around dawn inland. All lifting and dispersing for clear hills.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Patchwork of cloud and sun; some early cloud in west, becoming sunnier near coast with time. Visibility excellent.
How Cold? (at 900m)
6C rising to 9C.
Freezing Level
Above the summits.
Planning Outlook
A changeable prospect during the week ahead. Sunday sees extensive rain moving in from the west with heavy bursts, accompanied by powerful southerly winds. Improving for many places into Monday as higher pressure expands in from the south, but showers and brisk winds continue toward northwest Scotland. Strong southeasterly winds by Tuesday, widely gales on mountains with turbulent downslope gusts toward the west; a risk of rain developing from the south during the day, becoming heavy later. Blustery south-southwesterlies into Wednesday and Thursday, showery in the west. Higher pressure tends to expand further north again into early October. Mostly mild temperatures.