Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday'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.
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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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.
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
Thursday 25th June 2026
Last updated
Wed 24th Jun 26 at
4:28PM
Summary for all mountain areas
An even hotter day across the mountains; sunny and humid - risk of sunburn and dehydration. Rain soon arrives into Northwest Highlands, thunderstorms afternoon, later stretching east and south. Moderate breezes, lightest early, strengthening into evening, walking becoming strenuous over high tops.
Headline for Eryri / Snowdonia National Park
Hot, humid sunshine; wind strengthens, notably later
How windy? (On the summits)
South to southeasterly between 15 and 25mph; perhaps gusty at times with stronger sustained speeds later, up to 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, and deteriorating into nighttime.
How Wet?
Likely dry
Remote risk of heavy showers/thunderstorms developing later afternoon giving locally torrential rain. This risk rises after dusk.
Cloud on the hills?
Likely none though patches may form if rain occurs
A few well-scattered patches of ragged fog at dawn, soon dissipating after sunrise for cloud-free hills. A low chance of some patchy cloud reforming on high terrain later if thunderstorms occur.
Chance of cloud free summits?
Nearly certain
Sunshine and air clarity?
Mostly sunny, some patchy higher cloud around. Good visibility but a haze, which may thicken later from the south.
How Cold? (at 900m)
22C rising to an exceptionally warm 25 to 27C in afternoon, very humid too. Valley temperatures locally approaching 30 to 33C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 26th June 2026
Last updated
Wed 24th Jun 26 at
4:28PM
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, mostly early
From before dawn, risk scattered bursts of heavy rain or thunderstorms. Risk tends to ease through afternoon, though east Wales may continue to see rain for a time.
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 22 to 24C, cooling to 15 to 17C, coolest towards Cardigan Bay.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 27th June 2026
Last updated
Wed 24th Jun 26 at
4:28PM
How windy? (On the summits)
Southerly, some uncertainty of peak speed, in range 30mph to possibly 50mph, at least in gusts around Snowdon group.
Effect of the wind on you?
Expect strenuous walking conditions, more challenging in places with buffeting gusts knocking you off balance.
How Wet?
Bursts of rain, risk thunder
High uncertainty of detail, but expect clusters of heavy showery rain tracking northeastward throughout the day. Lengthy drier windows possible, but risk sudden downpours, thunder and lightning.
Cloud on the hills?
Varied, mostly west and in rain
Varied cloud banks, most frequent over west coastal slopes. Some patches lower down inland in morning. Breaks to tops more often north and east. In rain, banks lower and fill in, ragged low patches.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Glimpses of sun, but high cloud covering sky for periods. Some mistiness in morning. Visibility often good, but occasionally poor in rain.
How Cold? (at 900m)
Around 14C, small variation all day. Still rather humid. Feeling cooler directly in wind.
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 mid-to-high 20s. Scotland will be slightly cooler, though temperatures will still reach the low 20s on many slopes. A risk of extended torrential thunderstorms on Friday afternoon in northern areas. Thunderstorms may continue in the north on Saturday as well, but progressively less warm as the weekend goes: fronts begin to come in off the Atlantic, bringing a strengthening wind and bands of rain and low cloud, particularly affecting western mountains. Into next week, Atlantic westerlies will dominate with mixed weather.