Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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
Wednesday 2nd September 2026
Last updated
Tue 1st Sep 26 at
4:30PM
Summary for all mountain areas
Much of the Highlands sees a fine day with fairly light winds; a veil of high cloud tends to thicken, risk of some rain later. S Scotland & N England has more cloud, some rain. Heavier rain moves across Wales into Peak District, followed by showers on a strong southwesterly wind, quite humid.
Headline for Eryri / Snowdonia National Park
Windy, gale-force gusts. Heavy rain then showers, low cloud.
How windy? (On the summits)
South-southwesterly 30-40mph, gusty over the tops, and briefly strengthening with gusts approaching 50mph around mid-late morning. Then southwesterly afternoon, often 30-35mph, rising again toward evening 40mph.
Effect of the wind on you?
Strenuous walking in exposure much of the day, more arduous moments with considerable buffeting and wind chill.
How Wet?
Heavy rain then drizzle and showers
Several hours of morning rain, heavy for a time particularly west. Rain will ease into patches and gradually fade to drizzle mixed with some showery bursts; where in cloud in west staying often damp.
Cloud on the hills?
Extensive
Cloud extensive from 600m upward in morning, often lower around rain, widely to 400m and lower towards Cardigan Bay. As rain eases, bases rise, some breaks approach 800m inland and east, but near west coast often staying lower.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Overcast and dull with poor visibility, some brighter skies into afternoon, better visibility inland where dry.
How Cold? (at 900m)
10C rising to 12 or 13C, staying elevated overnight; humid. Feeling like 2 to 5C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 3rd September 2026
Last updated
Tue 1st Sep 26 at
4:30PM
How windy? (On the summits)
Southwesterly 20-35mph, trending towards lower speeds for a time but then a swathe of strong wind arrives late, 50-60mph.
Effect of the wind on you?
Walking impeded in exposure, feeling chilly, effecting easing somewhat but significantly deteriorating into night.
How Wet?
Some patchy rain, most later
Some drizzle on high tops early, this fading, with patchy rain coming and going much of the day, some dry windows as well. More frequent rain develops toward evening, sets in persistently into night.
Cloud on the hills?
Fairly extensive, improving trend
Hills extensively shrouded to low slopes to start, a gradual lifting trend, mostly east Snowdonia/Carneddau areas but bases may only approach 900-1000m, and remaining more extensive on west slopes. Will later fill in again more widely.
Chance of cloud free summits?
Rising to 40%
Sunshine and air clarity?
A few bright glimpses but more often overcast. Locally good visibility where cloud lifts, more often poor on high tops and western hills.
How Cold? (at 900m)
12C, little change until later when approaching 14C for a few overnight hours. Feeling like 3 to 5C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 4th September 2026
Last updated
Tue 1st Sep 26 at
4:30PM
How windy? (On the summits)
West-southwesterly 35 to 50mph, stronger gusts likely around or before dawn over 60mph for a time.
Effect of the wind on you?
Arduous walking conditions, frequent buffeting knocking you off balance on exposed terrain. Considerable wind chill.
How Wet?
Early rain clears to light showers
Overnight rain likely heavy for a time through toward dawn, then clearing to leave just residual patches of rain which may linger for a few hours in west, some light showers may come and go all day.
Cloud on the hills?
Often capping higher western tops
Cloud banks at varied heights from dawn, tending to lift and break early morning toward upper slopes, but patches then likely to come and go on tops all day, most often in west above 700-800m. Better breaks eastward.
Chance of cloud free summits?
30% rising to 60% eastern tops.
Sunshine and air clarity?
Fairly cloudy, occasional sun mostly east. Visibility often good, but reduced at times in rain, mostly in west.
How Cold? (at 900m)
7 or 8C, may be slightly milder at dawn. Directly in wind feeling like -3C.
Freezing Level
Above the summits.
Planning Outlook
A series of weather systems moves in from the Atlantic this week and next to bring spells of rain and showers, accompanied by frequently strong to gale force mountain winds. A window of better weather is likely this Saturday for Scotland and northern England, but further rain is expected to move into Wales, which then extends north by Saturday night and Sunday, possibly widely heavy rain and a risk of more powerful upland gales developing over Scotland into Sunday. Temperatures will vary, mildest toward the south, but some cooler air moves in from the north at times bringing higher Scottish tops close to freezing point.