Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Thunderstorm
Heavy or torrential downpours with hail, risk of thunder and lightning. Seek shelter where possible.
Warm
Comfortable temperatures on the hills, 12 to 16C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
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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.
Thunderstorm
Heavy or torrential downpours with hail, risk of thunder and lightning. Seek shelter where possible.
Warm
Comfortable temperatures on the hills, 12 to 16C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 12th June 2025
Last updated
Wed 11th Jun 25 at
4:00PM
Summary for all mountain areas
Strong southeasterly winds, reaching gale-force with powerful gusts over mountains and to some lower slopes. Much of the Highlands dry most of daytime, but bursts of rain develop near west coast, risk thundery later. Wales sees heavy rain and thunderstorms morning into middle of day, spreading over northern England afternoon.
Headline for Eryri / Snowdonia National Park
Thunderstorms. Strongest winds in morning.
How windy? (On the summits)
Southeast then southerly, 25 to 40mph, risk gusts 50mph for a time; speeds tending to lessen into afternoon.
Effect of the wind on you?
Very blustery, walking arduous on high terrain, affecting balance on exposed tops and ridges, sudden buffeting gusts.
How Wet?
Thunderstorms likely soon develop
Sporadic bursts of rain from elevated cloud from dawn. Increasing threat during morning of widespread heavy rain developing from the south, lasting several hours, risk thunderstorms; clearing northward later in daytime to leave patchy rain, perhaps still an odd heavier shower.
Cloud on the hills?
Lowering, varied patches in rain
Most cloud initially above the hills, but as rain develops, cloud soon filling in across the hills, in places patches from forest canopies upward during and after heavy bursts. May improve later in daytime.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Mainly overcast, hazy, poor visibility in rain. Some sun may break through later in the day, visibility may improve.
How Cold? (at 900m)
Humid 14C from dawn, but then little change; small variation with height in morning.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 13th June 2025
Last updated
Wed 11th Jun 25 at
4:00PM
How windy? (On the summits)
Southerly, speed may fluctuate markedly, in range 25 to 40mph, risk suddenly gusty for periods; often strongest furthest west.
Effect of the wind on you?
Expect variable conditions, at times fairly small, but more challenging for periods, often affecting balance.
How Wet?
Risk thundery downpours
Sporadic heavy showers forming, possible localised thunderstorms developing again - timing uncertain, but greater risk more widespread toward evening.
Cloud on the hills?
Variable cloud, breaks
Banks of cloud at various elevations from dawn into morning, also during and after rain at any time. Greater risk of low cloud lingering toward Llyn peninsula. May largely break up for several hours at least.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Some sun, mostly through high cloud. Visibility good away from rain, but likely a haze.
How Cold? (at 900m)
10 to 12C, humid.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 14th June 2025
Last updated
Wed 11th Jun 25 at
4:00PM
How windy? (On the summits)
Forecast uncertainty: South to southwesterly, 15 to 25mph, gusty around showers.
Effect of the wind on you?
Fairly small, but at times gusty wind may affect comfortable walking where exposed.
How Wet?
Risk heavy showers forming
Overnight heavy rain and thunderstorms likely soon clearing. Some patchy rain on and off, then scattered heavy showers developing, risk localised thunderstorms, clearing later.
Cloud on the hills?
Lifting, may largely clear tops
Banks of cloud at various levels from dawn. Tending to rise and break up, likely to increasingly clear the hills by afternoon.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Broken cloud and sun. Visibility very good.
How Cold? (at 900m)
10C from dawn, small variation all day, may drop a little into evening.
Freezing Level
Above the summits
Planning Outlook
Staying warm and humid into Friday, a risk of scattered thundery downpours developing. A more extensive plume of torrential rain and thunderstorms likely to advance northwards on Friday night into early Saturday, followed by further heavy and possibly thundery showers. Turning cooler over the weekend. Southwesterlies then prevailing with rain at times Sunday through Tuesday, mostly western Scotland, but a trend toward higher pressure building from the south with drier conditions emerging through mid to late next week.