Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today'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.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Hot
Heatwave conditions. Very high temperatures, rising to 20C+ on high tops, approaching 30C in some valleys. Beware of heat stroke and dehydration. Carry plenty of liquid.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
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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.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Hot
Heatwave conditions. Very high temperatures, rising to 20C+ on high tops, approaching 30C in some valleys. Beware of heat stroke and dehydration. Carry plenty of liquid.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 24th June 2026
Last updated
Tue 23rd Jun 26 at
4:23PM
Summary for all mountain areas
Extensive hot sunshine and unusually humid - beware sunburn and dehydration. England and Wales as well as east Scotland see early low patchy fog clearing; highest tops of east Scotland may be at or above the cloud layer at dawn. Some cloud clings to Scotland's west coast, breezy over far northern tops.
Headline for Eryri / Snowdonia National Park
Exceptionally hot and humid sun; some early coastal fog
How windy? (On the summits)
From dawn, northerly 10mph, soon variable and less than 10mph most of the day. Orienting south-southeasterly overnight and slightly strengthening.
Effect of the wind on you?
Negligible
How Wet?
No rain
Cloud on the hills?
Little expected, may linger north for a time
Some early fog patches in the valleys, an odd bank higher up, and perhaps a more extensive low cloud layer towards northern coastal slopes at dawn. Cloud soon lifts and largely dissipates after sunrise, though may linger for a few hours along northernmost slopes.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Extensive sunshine, some thin high cloud around. May start hazy but visibility improves with time.
How Cold? (at 900m)
17 or 18C, rising to an exceptionally hot and humid 22 to 23C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 25th June 2026
Last updated
Tue 23rd Jun 26 at
4:23PM
How windy? (On the summits)
South to southeasterly between 15 and 25mph; perhaps gusty at times with stronger sustained speeds, 30-35mph.
Effect of the wind on you?
Fairly small, although there may be sudden buffeting at times both on higher areas and some lower slopes.
How Wet?
Small risk thunderstorms
Risk thunderstorms developing later afternoon giving locally torrential rain.
Cloud on the hills?
Little if any although patches may form near rain
Some patchy fog just at dawn, soon dissipating and extensively cloud free. Should thunderstorms occur, varied ragged patches reforming.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Periods of sunshine. Persistent haze.
How Cold? (at 900m)
Exceptionally warm 25 to 28C in afternoon, humid. Valley temperatures locally approaching 31 to 33C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 26th June 2026
Last updated
Tue 23rd Jun 26 at
4:23PM
How windy? (On the summits)
South-southwesterly 20-25mph, strong gusts around showers, and risk rising later, gusty 30-35mph over tops.
Effect of the wind on you?
Affecting ease of walking in exposure most of the day, may deteriorate to strenuous conditions on tops with buffeting.
How Wet?
Bursts of rain/thunderstorms
From before dawn, risk scattered bursts of heavy rain or thunderstorms. This risk may lower afternoon, though this uncertain.
Cloud on the hills?
Patchy banks forming
Mountains may start substantially clear, just odd ragged patches here and there. With time, banks increasingly forming from 500m up at varied heights (summits may be out of cloud at times). Mostly affecting slopes toward Cardigan Bay; Carneddau/east Wales may remain clear.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Patchy sunshine, more extensive sun north and east later. Visibility improves after morning haze lifts.
How Cold? (at 900m)
Starting near an exceptionally hot and humid 21 to 23C, cooling to 16 to 18C, coolest towards Cardigan Bay.
Freezing Level
Above the summits.
Planning Outlook
Exceptionally warm and humid most mountain areas until later Friday; valley temperatures approaching the low-to-middle 30s in England and Wales, with hill temperatures approaching the high 20s at least. Scotland will be slightly cooler, though temperatures will still reach the low 20s on many slopes. Scattered thunderstorms on Thursday and Friday, with a risk of extended torrential thunderstorms on Friday afternoon in northern areas. Over the weekend, progressively less warm as fronts begin to come in off the Atlantic, bringing a strengthening wind and bands of rain and low cloud, particularly affecting western mountains. Into the following week, Atlantic westerlies will dominate, with an indication of high pressure to the south producing dry and bright windows.