Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday's Forecast
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 22nd September 2026
Last updated
Mon 21st Sep 26 at
4:00PM
Summary for all mountain areas
Scotland starts windy with rain in the northwest highlands, this spreading fairly widely over the highlands into afternoon and evening. Wind eases, some bright breaks in the far northwest. Feeling damp, warm, and often cloudy England and Wales, drizzle on west hills, odd patchy rain, but sun glimpses too.
Headline for Eryri / Snowdonia National Park
Drizzly western slopes, rare light rain, sun breaks northeast
How windy? (On the summits)
South to southwesterly 10 to 15mph, sometimes less, but a few stronger gusts over high tops will approach 20mph.
Effect of the wind on you?
Mostly small, but locally gusty which may feel more noticeable on exposed ridges.
How Wet?
Damp air, drizzle mostly west
Patchy drizzle mostly west coastal hills, feeling generally damp where in cloud. More often dry toward the north and east, though a few spotty afternoon showers may break out. Rainfall totals small.
Cloud on the hills?
Low cloud most persistent near coast
Varied cloud and fog banks from dawn, covering hills and in some valleys; highest summits may be just at or above cloud early in day. Banks tend to drift higher up and gradually thin, best north and east, summits around Carneddau possibly seeing some breaks. Low cloud likely to linger western hills, rarely above 600m.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Largely cloudy, misty; some sun breaking through north and east, also some sun and clear air possible around dawn on high tops above cloud.
How Cold? (at 900m)
11 or 12C, humid; little change into evening and night.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 23rd September 2026
Last updated
Mon 21st Sep 26 at
4:00PM
How windy? (On the summits)
Southwesterly 15-25mph, trending northwesterly, gusting 30mph at times but lessening later.
Effect of the wind on you?
Becoming blustery over the high tops, walking briefly impeded afternoon.
How Wet?
Morning rain, clearing afternoon
Drizzly on high terrain in the early hours, patchy rain around, which may become frequent for a few hours. Through afternoon, rain clears away to the east to become dry.
Cloud on the hills?
Fairly extensive morning, well-clearing
Most terrain above 600m shrouded much of morning, a few breaks but also more extensive for a time with ragged patches to forest canopies. Through afternoon, cloud lifts, and breaks up, just banks above 800m into evening, mostly towards Anglesey.
Chance of cloud free summits?
20%, rising to 70% through afternoon
Sunshine and air clarity?
Glimpses of sun, breaking out afternoon, mostly sunny by late in the day. Visibility becomes excellent as rain breaks.
How Cold? (at 900m)
10C through morning, then cooling, to finish near 7C. Feeling just above 0C in strongest wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 24th September 2026
Last updated
Mon 21st Sep 26 at
4:00PM
How windy? (On the summits)
Southerly 20-25mph, gusts to 30-35mph over high tops, increasing downslope too.
Effect of the wind on you?
Blustery in exposure, gusts affecting stability, not just on high terrain.
How Wet?
Any rain unlikely
A little drizzle/damp air may affect the high tops nearest Cardigan Bay late in the day.
Cloud on the hills?
Little or none until later
Mist in some sheltered valleys around dawn, this soon lifting and dissipating for clear hills. Later, cloud banks reform around high tops.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Patchy sun, perhaps more sunny later but weakened by high cloud. Very good visibility.
How Cold? (at 900m)
8C rising to 11C, staying elevated overnight.
Freezing Level
Above the summits.
Planning Outlook
A heavier swathe of rain moves east Wednesday morning, soon clearing Scotland but leaving a few showers behind, later clearing England and Wales. Southwesterly winds increase again on Thursday and rain later moves into western Scotland, but elsewhere is likely dry, bright in Wales and much of England. A variable outlook continues next weekend and beyond with high pressure building from the south at times with fairly warm and dry conditions, but Atlantic systems still pass to the north bringing occasional rain and showers toward western Scotland at least, strong wind here with sustained gales in the north. Next week remains on the unsettled side: west-southwesterly wind with bands of rain passing over most mountains, but a trend towards higher pressure brings longer settled windows into October.