Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
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.
Click an icon for more information or click here for a key to all icons.
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
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
Wednesday 16th September 2026
Last updated
Tue 15th Sep 26 at
4:11PM
Summary for all mountain areas
Northwesterly wind pushes chilly air and showers into Scotland, milder but showery in Wales and west England. Wind lessens and showers increasingly scattering, a few light showery clusters here and there (total rainfall small). Rain and wind into west Scotland later, spreading widely overnight.
Headline for Eryri / Snowdonia National Park
Showers on and off, trending to fade with sun breaking out
How windy? (On the summits)
A gusty northwesterly 20-30mph, shifting westerly and lessening to 15-20mph; later southwesterly and restrengthening to 25-30mph, further strengthening overnight.
Effect of the wind on you?
A blustery start, buffeting affecting stability in exposure and feeling chilly. Easing to fairly small effects.
How Wet?
Drizzle, some showers
Drizzly from the Llyn Peninsula towards Carneddau, to lower areas in the early morning, lifting to high terrain afternoon and increasingly breaking up. Some showers too, mostly east Wales. A few mid-afternoon showers cannot be ruled out, but largely dry by late afternoon into evening.
Cloud on the hills?
Extensive to start, lifting to high terrain, may break later
Blanket cloud to at least middle slopes to start, to lower slopes nearest Anglesey. Cloud more broken east of high tops but also misty on some low terrain too. Cloud lifts, to largely 800m and breaking up somewhat, though clinging to high tops until later, some varied lower bases should showers occur.
Chance of cloud free summits?
20%, gradually rising, later 60%
Sunshine and air clarity?
Patchy sun breaks out, most notably on lower slopes, the some thin high cloud approaching from the west later. Good visibility, a little haze out over the sea.
How Cold? (at 900m)
7 or 8C. Feeling near or below freezing in direct wind in the early and late hours.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 17th September 2026
Last updated
Tue 15th Sep 26 at
4:11PM
How windy? (On the summits)
Westerly 25-30mph, easing in mid-Wales for a few hours; later strengthening, notably north, gusting 40mph.
Effect of the wind on you?
Blustery in exposure much of the day, buffeting gusts and a chilly feeling, and more strenuous walking late.
How Wet?
Scattered showers
A broad area of rain from overnight clears away to the east just around dawn for a day of scattered showers. Many hills will see extended dry windows, but a period of more frequent showers afternoon.
Cloud on the hills?
Caps on summits with breaks
Cloud fairly extensive from overnight will break around sunrise (or perhaps just before), to mostly just passing banks over the highest tops. A few lower patches form here and there around showers, more frequent afternoon.
Chance of cloud free summits?
60%, 40% afternoon
Sunshine and air clarity?
Mostly sunny on lower slopes, cloudier for a time afternoon. Good visibility, though some haze out over the Irish Sea.
How Cold? (at 900m)
6 or 7C, perhaps milder just at and before dawn. Feeling near freezing in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 18th September 2026
Last updated
Tue 15th Sep 26 at
4:11PM
How windy? (On the summits)
Westerly 20-30mph, shifting southwesterly and strengthening, to a gusty 35-45mph later.
Effect of the wind on you?
Increasingly strenuous walking, more arduous moments later in considerable buffeting with wind chill.
How Wet?
Patchy rain from midday
A little spotty drizzle in the west in the morning, but mostly dry. From midday, patchy rain arrives from the west, may set in for a few hours, some lingering drizzle on summits during breaks later in the day.
Cloud on the hills?
Fairly extensive, window of improvement
Cloud shrouds west slopes, middle heights up, higher and more broken east. Cloud lifts, breaks up for a time but caps linger over tops. Through afternoon, will fill in more widely, 500m or lower on slopes facing Cardigan Bay; highest bases towards Carneddau.
Chance of cloud free summits?
40% lowering to 10%
Sunshine and air clarity?
Patchy sunshine, becoming cloudy and later dull. Hazy at best, visibility deteriorating afternoon.
How Cold? (at 900m)
7C, rising towards 9C afternoon and rising further evening into night. Feeling at or below 0C in direct wind.
Freezing Level
Above the summits.
Planning Outlook
Showers and strong westerly wind prevails from Thursday into the weekend - areas of low pressure passing north of Scotland with frontal systems bringing bands of rain, followed by showers, wettest over western mountains in Scotland. Periods of gale-force winds over higher terrain, cool temperatures with significant wind chill, particularly in the north where temperatures will occasionally approach freezing point on high Scottish tops. Showers generally more scattered in England and Wales, most showers in the west; bright spells too, but bands of rain and low cloud will pass these areas. Mild temperatures, at times warm south Pennines and Wales. Milder, more settled weather is indicated next week, though sometimes breezy in Scotland, spells of rain in the west.