Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday'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
Tuesday 8th September 2026
Last updated
Mon 7th Sep 26 at
4:18PM
Summary for all mountain areas
Frequent rain and severe gales over Scottish Highlands, easing from west later; feeling cold. Strong wind with showers and sun breaks in south Scotland and England, showers increasingly frequent from north, extended falls forming. Showers scattered in Wales, least rain south with lighter wind.
Headline for Eryri / Snowdonia National Park
Increasingly blustery in exposure; scattered showers
How windy? (On the summits)
Westerly 25-30mph, strengthening and shifting northwesterly through afternoon, finishing at a sustained 35mph in exposure.
Effect of the wind on you?
May start fairly small on hills towards southern Snowdonia NP, but soon widely blustery, some more strenuous conditions on exposed tops and ridges later in the day and feeling chilly.
How Wet?
Scattered showers
Showers come and go from the northwest through the day, generally on the lighter side, but a rising risk of more frequent showers with local heavy falls as afternoon goes.
Cloud on the hills?
Largely just summits, varied broader banks, mostly later
Cloud over high terrain early, lowest bases to the west including to mid-Wales as low as 500m. A lifting trend, with just banks over summits for a time, but bases return lower during showers, and later longer periods of lower cloud as bands of rain become more frequent.
Chance of cloud free summits?
Rising to 50% for a time
Sunshine and air clarity?
A patchwork of sunshine, best on low eastern slopes, more often cloudy later in the day. Good visibility though some haze near coasts.
How Cold? (at 900m)
7C. Feeling just below freezing in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 9th September 2026
Last updated
Mon 7th Sep 26 at
4:18PM
How windy? (On the summits)
Northwesterly 25-30mph to start, easing 15-20mph afternoon, shifting westerly and may further lessen.
Effect of the wind on you?
Blustery on tops to start, a chilly feeling, easing to small effects with time.
How Wet?
A little rain, mostly morning
Patchy rain drifts into Snowdonia NP and the Llyn Peninsula from before dawn, gradually breaking up and becoming substantially dry with time. Little or no rain reaches hills near Bala.
Cloud on the hills?
Rising to high Snowdon group summits
Fairly extensive above middle slopes from Llyn Peninsula to Carneddau, but lifting and breaking up, hills southeast of Snowdon group substantially clearing. Banks roll over highest summits but breaks will form here too.
Chance of cloud free summits?
30%, later rising to 60%
Sunshine and air clarity?
Sun increasingly frequent, particularly towards east Wales. Good visibility, a little early haze.
How Cold? (at 900m)
7C, rising a degree, or to 9C towards Berwyn group. Feeling just below freezing to start, wind chill effect easing.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 10th September 2026
Last updated
Mon 7th Sep 26 at
4:18PM
How windy? (On the summits)
Southwesterly 15-20mph, rising tendency, notably afternoon, tops speeds to 30-35mph evening, rising further after dark.
Effect of the wind on you?
Fairly small, but becoming blustery, ease of walking impacted into evening.
How Wet?
Little until later
A few spots of drizzly rain drift onto hills in west Snowdonia NP/Llyn Peninsula from time to time, dry windows too. Later, a larger band of rain sweeps in from the west, setting in persistently into evening.
Cloud on the hills?
Mostly western hills, more extensive into evening
Hills from Snowdon group west to Llyn Peninsula often shrouded above 700m. Some early cloud towards Carneddau and east Wales will break up, and perhaps more widely broken for a few hours. Into evening, cloud becoming more widely extensive.
Chance of cloud free summits?
40%, later deteriorating
Sunshine and air clarity?
Sunny windows, best afternoon, becoming overcast into evening. Good visibility, a haze towards the Irish Sea.
How Cold? (at 900m)
7C rising to 9C, staying elevated into night.
Freezing Level
Above the summits.
Planning Outlook
Generally unsettled through the week with spells of rain and showers moving in from the Atlantic, accompanied by strong to gale force mountain winds. Temperatures will vary, mildest toward the south, but cooler air moves in from the north at times bringing higher Scottish tops occasionally close to freezing point, feeling cold in the wind chill. A few high pressure ridges bring settled windows, notably afternoons of Wednesday and Friday; northwestern areas, particularly in Scotland, will tend to hold onto some hill cloud despite high pressure. Weather remains varied from the weekend into next week, Scotland most often unsettled, best windows of improvement to the south. A more settled period is indicated in the later month with warm temperatures.