Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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
Monday 31st August 2026
Last updated
Sun 30th Aug 26 at
4:31PM
Summary for all mountain areas
Showers scattered across most hills through morning, locally clustering for frequent falls with heavy bursts. Showers gradually clear eastward, spotty light rain fades out with time as sunny bursts break out (though weakened by high cloud). Cool-to-mild, but feeling chilly in a strengthening wind.
Headline for Eryri / Snowdonia National Park
Windy with showers, both easing afternoon
How windy? (On the summits)
Northwesterly 35-40mph early in the day, gradually shifting westerly and easing, 20-25mph later or lower southernmost areas.
Effect of the wind on you?
Blustery, making walking uncomfortable on exposed high terrain, in places frequent buffeting though morning with market wind chill; effects will ease with time.
How Wet?
Showery rain, fading afternoon
Showery rain frequent for several hours, some heavier moments mixed in, then tending to improve from the west to fewer showers through afternoon; a lingering drizzle on summits for a time, but this fades too.
Cloud on the hills?
Lowest morning, rising higher, breaks to summits later
Fairly extensive across the hills in the morning, to lower elevations for a time near west coast. The base rising toward upper slopes, increasing high breaks through afternoon, to summit height, some variable caps coming and going.
Chance of cloud free summits?
20% rising to 70%
Sunshine and air clarity?
Largely cloudy, glimpses of sun forming, then sun developing near coast and extending inland; high cloud later builds. Visibility becomes good, some haze west.
How Cold? (at 900m)
7 or 8C, little change all day, though may be slightly warmer in the early hours. Feeling near or just below freezing directly in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 1st September 2026
Last updated
Sun 30th Aug 26 at
4:31PM
How windy? (On the summits)
West to southwesterly 25 to 30mph, some stronger gusts forming at times.
Effect of the wind on you?
Blustery, affecting ease of walking and balance on exposed tops and ridges. Marked wind chill.
How Wet?
Generally damp in west
A mix of drizzle and some showery rain rain much of the day over western hills. Smaller amounts further east.
Cloud on the hills?
Fairly extensive, lowest west
Banks of cloud often cap higher slopes above 600 to 800m, lowest near Cardigan Bay. Some breaks at times, best further east where only patchy on tops. Late in the day, tending to fill in more extensively over all high terrain.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Generally cloudy, glimpses of sun toward north and east on low slopes. Visibility reduced in rain, better if drier, more often east.
How Cold? (at 900m)
9 or 10C, little change all day. Feeling around 0C in the wind on tops.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 2nd September 2026
Last updated
Sun 30th Aug 26 at
4:31PM
How windy? (On the summits)
Southwesterly 30-40mph, gusty over the tops, and strengthening for a time, gusting up to 50mph or higher.
Effect of the wind on you?
Strenuous walking in exposure much of the day, more arduous moments with considerable buffeting and feeling chilly.
How Wet?
Rain into drizzle
Several hours of morning rain, briefly heavy. Rain will ease into drizzle, mostly affecting summits and high west slopes. A few patches of rain may return later.
Cloud on the hills?
Extensive, some improvement
Cloud soon fills in extensively from 600m upward, often lower around rain, widely to 400m and lower towards Cardigan Bay. As rain eases, bases rise, some breaks approach 800m, best east, but summits and upper west slopes stay shrouded.
Chance of cloud free summits?
20%
Sunshine and air clarity?
A few sunny glimpses break out on low slopes later, good visibility here. Largely overcast and dull on high terrain.
How Cold? (at 900m)
10C rising to 12 or 13C, staying elevated overnight. Feeling like 2 to 5C in direct wind.
Freezing Level
Above the summits.
Planning Outlook
A generally unsettled outlook during the first two weeks of September with frequent rain and strong winds. Low pressure dominates and a series of frontal systems move in from the Atlantic. West to southwesterlies, often gale force over the mountains in the second half of this coming week. Heavy rain most prolonged in the west where increasingly wet underfoot, streams rising to be in spate. Low cloud often covering the hills, rarely clearing western summits. Temperatures varying, some notably cooler days for Scotland, at times more humid air mainly toward the south. A few brighter windows will break out, mostly south and eastern areas, but always brief and any detail on timing remains uncertain.