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.
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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 9th September 2026
Last updated
Tue 8th Sep 26 at
4:16PM
Summary for all mountain areas
Breezy with early scattered rain in north and east Scotland, both easing for a dry and bright afternoon with little wind. Blustery Pennines just at dawn, notably east, but this easing; dry in England with most hills and fells clearing. Early patchy rain in north Wales gradually clears for a bright afternoon.
Headline for Eryri / Snowdonia National Park
Early patchy rain and breeze, both ease with sun breaking out
How windy? (On the summits)
Northwesterly 30mph to start, or stronger over some high terrain in east Wales. Easing, to largely 15mph afternoon, shifting westerly and further easing into evening.
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, some heavier bursts in east Wales. Rain gradually breaks up, becoming substantially dry with time. Very little rain will reach the hills near Bala.
Cloud on the hills?
Rising to high Snowdon group summits, breaking later
Fairly extensive above middle slopes from Llyn Peninsula to Carneddau, but lifting and breaking up; well scattered on hills southeast of Snowdon group and soon clearing. Banks roll over highest summits into afternoon but breaks forming too.
Chance of cloud free summits?
30%, later rising to 60%
Sunshine and air clarity?
Often sunny, patchy high cloud around. An early haze looking out towards coasts, but visibility improving to become good.
How Cold? (at 900m)
7C, rising a degree towards mid-Wales. 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
Tue 8th Sep 26 at
4:16PM
How windy? (On the summits)
Southwesterly 15-25mph, strengthening, notably afternoon, tops speeds to 35-40mph as evening approaches.
Effect of the wind on you?
Fairly small, but walking increasingly impeded, more strenuous conditions later in the day.
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. Through afternoon, patchy rain becomes more frequent, setting in for several hours towards evening.
Cloud on the hills?
Mostly western hills, more extensive later
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. From mid-afternoon, cloud increasingly fills in.
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, may briefly rise higher into night.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 11th September 2026
Last updated
Tue 8th Sep 26 at
4:16PM
How windy? (On the summits)
Northwesterly 20mph to start, easing, to largely 10mph later.
Effect of the wind on you?
Small; a little early breeze in exposure.
How Wet?
Soon dry
A little drizzle over the high tops in cloud in the early morning, soon fading for dry hills.
Cloud on the hills?
Fairly extensive early, improving
Most high terrain starts in cloud, bases towards middle slopes from Llyn Peninsula to Carneddau. Cloud will lift with time, breaks forming, soonest Berwyn group and increasingly widely. High Snowdon group summits will be slow to clear.
Chance of cloud free summits?
Rising to 50%
Sunshine and air clarity?
Sunshine increasingly breaks out. Good visibility, though a haze building.
How Cold? (at 900m)
8 or 9C, later trending slightly cooler.
Freezing Level
Above the summits.
Planning Outlook
A typical autumnal pattern in the week ahead: periods rain and strong wind, gales over tops at times, particularly in Scotland. Temperatures generally mild, some warmer windows in England and Wales, as well as cooler windows, chilly at times in Scotland, a little sleet possible on highest tops and feeling cold during strong winds. Best chance of near-term settled windows on Friday and Sunday: mornings start cool with scattered low cloud, lifting and breaking up, clearest on eastern hill groups. Weather remains mixed into next week with more swathes of rain and strong wind. A tendency towards high pressure building southwest of the country will bring more bright, drier days to England and Wales. Staying unsettled longer in Scotland. Indications of more extensive windows of settled weather in the later month.