Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday's Forecast
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Clear
Excellent or superb visibility, no navigation issues.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
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Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Clear
Excellent or superb visibility, no navigation issues.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 21st June 2026
Last updated
Sat 20th Jun 26 at
3:00PM
Summary for all mountain areas
Extensive bright sunshine - beware of sunburn and dehydration - and light wind. Cloud and a few brief showers NW Highlands will move away north, whilst along the Pennines and later Cumbria and S Scotland, patchy cloud and an isolated shower will form.
Headline for Eryri / Snowdonia National Park
Light wind; bright sunshine and very clear air.
How windy? (On the summits)
Easterly, 10mph or less, perhaps 20mph evening.
Effect of the wind on you?
Negligible most or all daylight.
How Wet?
Rain not expected
Cloud on the hills?
Hills clear
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Periods of sunshine weakened or giving way at times by areas of high cloud. Visibility excellent.
How Cold? (at 900m)
12C at dawn, rising to 15 to 18C afternoon. Feeling humid.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 22nd June 2026
Last updated
Sat 20th Jun 26 at
3:00PM
How windy? (On the summits)
South to southeasterly between 15 and perhaps 25mph.
Effect of the wind on you?
Fairly small
How Wet?
Risk thunderstorm
Confidence low: it may remain dry. But risk of a few bursts of rain, perhaps brief although from afternoon chance scattered thunderstorms.
Cloud on the hills?
Very little for most of the day - may form in rain.
Generally the hills free of cloud although fog may form on higher slopes in rain.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Periods of sunshine although sometimes through thin high level cloud. Visibility good, although a haze.
How Cold? (at 900m)
19C - very warm and also very humid indeed.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 23rd June 2026
Last updated
Sat 20th Jun 26 at
3:00PM
How windy? (On the summits)
Southwesterly 15 to perhaps 25mph,.
Effect of the wind on you?
Fairly small.
How Wet?
Rain very unlikely
Cloud on the hills?
Little if any
Chance of cloud free summits?
Soon almost certain
Sunshine and air clarity?
Sunshine extensive, sometimes weak due to thin high level cloud. Good visibility although hazy.
How Cold? (at 900m)
18C rising to a very warm (and exceptionally humid) 21C.
Freezing Level
Above the summits.
Planning Outlook
Extensively dry, very warm but very humid indeed England and Wales, although around Monday chance of a thunderstorm. Rain and low cloud at times Scotland, mainly affecting western mountains - although later next week the warmth encroaching into Scotland. There may well be widespread thunderstorms later in the week, before less hot weather extends from the Atlantic around next weekend.