Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday'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.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Clear
Excellent or superb visibility, no navigation issues.
Very warm
Warm conditions across the hills, rising above 15C on tops. Increasingly hot on lower terrain, reaching 25C+ in many valleys. Beware of dehydration.
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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.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Clear
Excellent or superb visibility, no navigation issues.
Very warm
Warm conditions across the hills, rising above 15C on tops. Increasingly hot on lower terrain, reaching 25C+ in many valleys. Beware of dehydration.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 9th August 2026
Last updated
Sat 8th Aug 26 at
2:00PM
Summary for all mountain areas
A cold front, bringing rain and low cloud will progress only slowly southeast into central Britain. To the north, drizzly showers and low cloud will affect western mountains (mainly NW Highlands) whilst to the south mostly sunny and very warm.
Headline for Eryri / Snowdonia National Park
Blustery; risk of a little rain and low cloud north from Snowdon area.
How windy? (On the summits)
Westerly 20 to perhaps 30mph higher tops near and north of Snowdon.
Effect of the wind on you?
Mostly fairly small, although may well impede walking at times on higher summits northern Snowdonia NP.
How Wet?
Rain very unlikely
Small risk of rain briefly Snowdon range - early in day and again toward dusk.
Cloud on the hills?
Very little if any
The mountains very likely to be cloud free. But toward or during evening, chance westernmost slopes (most likely near Lleyn peninsula) patches beginning to come in above 300m,
Chance of cloud free summits?
Greater than 90%
Sunshine and air clarity?
Extensive, sometimes hazy, sunshine as cloud thins during morning; excellent visibility. Possibly cloudy again evening north from Lleyn peninsula.
How Cold? (at 900m)
11C, rising a little although in afternoon 18C easternmost summits.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 10th August 2026
Last updated
Sat 8th Aug 26 at
2:00PM
How windy? (On the summits)
Northwesterly 15mph, dropping to very low speeds by afternoon.
Effect of the wind on you?
Becoming negligible
How Wet?
Rain not expected
Cloud on the hills?
Mostly or all clearing during morning
Snowdon range: Cloud base rising through morning to 800 to about 1050m (some uncertainty at present as to whether highest tops will clear). Elsewhere, little if any.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Extensive sunshine - perhaps through areas of high level cloud and the Snowdon range may be intermittently cloudy (most likely morning. Excellent or superb visibility.
How Cold? (at 900m)
8C, rising to 13 to 17C, warmest well inland.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 11th August 2026
Last updated
Sat 8th Aug 26 at
2:00PM
How windy? (On the summits)
Southerly 10 or 15mph.
Effect of the wind on you?
Mostly negligible
How Wet?
Rain not expected
Cloud on the hills?
Very unlikely
Chance of cloud free summits?
90%
Sunshine and air clarity?
More or less unbroken sunshine. Excellent or superb visibility - haze may develop east Wales.
How Cold? (at 900m)
11C rising to 21C
Freezing Level
Above the summits.
Planning Outlook
Extensively fine and warm until Wednesday. The almost completely dry and warm weather will then persist across England and Wales - although sometimes a little rain and low cloud toward Cumbria. Underfoot conditions will remain exceptionally dry. Scotland, especially the W& NW Highlands, will have intermittent rain and low cloud - although probably still one or two fairly brief dry periods.