Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday'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.
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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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.
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
Friday 26th June 2026
Last updated
Thu 25th Jun 26 at
4:29PM
Summary for all mountain areas
Starting hot and humid again, a cooling trend afternoon. Thundery showers for many in the morning, tending to clear in Wales. Afternoon thunderstorms and torrential rain in north England and Scotland, risk of localised flash flooding near heaviest downpours. Driest south Wales and Northwest Highlands.
Headline for Eryri / Snowdonia National Park
Risk thundery showers; cooling afternoon, likely dry later
How windy? (On the summits)
South-southwesterly 20-25mph, perhaps lighter in the morning, but always gusty around showers, particularly if thundery, and a strengthening trend, 30-35mph over tops later in the day.
Effect of the wind on you?
Affecting ease of walking in exposure most of the day, buffeting gusts will be common, and walking likely increasingly strenuous as evening approaches.
How Wet?
Bursts of rain, risk of thunder, an easing tendency afternoon
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?
May becoming fairly extensive south and west
Mountains may start substantially clear, odd ragged patches here and there, thicker near rain. 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, some high cloud around more extensive sun north and east later with less high cloud. Visibility improves after morning haze lifts.
How Cold? (at 900m)
Starting at an exceptionally hot and humid 22 to 24C from overnight. Cooling through the day, finishing near 15 to 17C, coolest towards Cardigan Bay; Carneddau and east Wales slower to cool.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 27th June 2026
Last updated
Thu 25th Jun 26 at
4:29PM
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)
14 or 15C, small variation all day. Still rather humid. Feeling cooler directly in wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 28th June 2026
Last updated
Thu 25th Jun 26 at
4:29PM
How windy? (On the summits)
Southwesterly 20-25mph, sometimes gusting 30mph over high terrain, may reach sustained 30mph later.
Effect of the wind on you?
Fairly small, but gust impact ease of walking, perhaps more consistently impeded high terrain later in the day.
How Wet?
Morning rain, substantially dry afternoon
From before dawn, several bands of rain pass west-to-east, brief heavier falls likely in the morning. From midday onward, largely dry, some risk of light spots of rain drifting onto western hills.
Cloud on the hills?
Lifting and breaking trend afternoon
Fairly extensive through much of morning, to most middle slopes, or lower western slopes with ragged patches to forest canopies in the early morning. From noon, a rising and breaking trend, to banks above 800m with some breaks.
Chance of cloud free summits?
20%, rising afternoon to 50%
Sunshine and air clarity?
Mostly cloudy morning breaking into a patchwork of cloud and sun afternoon. Visibility becoming very good.
How Cold? (at 900m)
10 or 11C, may cool slightly later afternoon.
Freezing Level
Above the summits.
Planning Outlook
The transition away from the exceptionally hot and humid weather begins on Saturday as wind shifts southwesterly and strengthens. Rain and thunderstorms may continue on Saturday as well as perhaps early Sunday, but a front will push east across the country on Sunday, followed by fresher, sunnier weather; patchy rain will likely linger here and there, notably northwest Scotland. Westerly Atlantic patterns dominate next week: high pressure south and low pressure north will bring alternating settled and unsettled windows. Wind generally on the strong side, mild to sometimes warm temperatures, and periods of rain punctuated by bright sunshine. North and western areas most vulnerable to extensive cloud and prolonged rain.