Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
Hazy, some fog banks
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Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
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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.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
Hazy, some fog banks
Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
Warm
Comfortable temperatures on the hills, 10 to 15C 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
Wednesday 26th August 2026
Last updated
Tue 25th Aug 26 at
4:29PM
Summary for all mountain areas
East Scotland, the Pennines, and Wales start cloudy, this lifting, dissipating over much of Scotland. Early showery rain and cloud in Wales migrates to England and southwest Scotland, thundery showers following over Wales and England; driest/clearest northwest Scotland. Warm, humid, and breezy.
Headline for Eryri / Snowdonia National Park
Early rain breaks, thundery bursts later; warm and humid
How windy? (On the summits)
Southeasterly 25-30mph and gusty early in day, a gradual easing tendency, towards 10-15mph later.
Effect of the wind on you?
Early gustiness affecting stability in the morning, tending to ease to become fairly small.
How Wet?
Early rain, risk thundery bursts later
A risk of steady rain and drizzle over a few early hours, tending to clear northwards. During afternoon, risk of heavier bursts of rain forming with possible thunder; location of afternoon showers is uncertain, and may mostly stay towards eastern areas.
Cloud on the hills?
Fairly extensive, lifting, but variable over tops
Cloud fairly widely shrouding hills above 500-600m, lower banks toward east, patches from forest canopies upward around rain. Tending to rise and later break up somewhat, but patches may cling to high tops, and variably lower where rain occurs.
Chance of cloud free summits?
20% rising to 40%
Sunshine and air clarity?
Mostly overcast, sun increasingly breaking out later but some thin high cloud around too. Hazy start, visibility improving to be good when dry.
How Cold? (at 900m)
12C rising to 14C, quite humid. Staying elevated and may rise further into night. Feeling like 5C in the wind at first.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 27th August 2026
Last updated
Tue 25th Aug 26 at
4:29PM
How windy? (On the summits)
Southeasterly 25-35mph, shifting southwesterly with time and easing towards 20mph; gusty much of the day.
Effect of the wind on you?
Nuisance gusts affect walking at times through much of the day, more strenuous walking early with notable buffeting.
How Wet?
Often raining, thundery bursts
Several hours of rain from dawn, heavy, thundery falls mixed in. Tending to break into showers with time, but thunderstorms may well redevelop afternoon. Beware rapidly rising streams and local flood risk.
Cloud on the hills?
Fairly extensive, local improvement
Cloud from at least middle slopes upward in the morning, and likely lower with patches into valleys during rain. Lifting, but slopes towards Cardigan Bay will be slow to clear above 700-800m, and high tops may not clear.
Chance of cloud free summits?
10% rising to 30%
Sunshine and air clarity?
Overcast and dull in the morning with poor visibility, breaking into patchy sunshine with very good visibility out of showers.
How Cold? (at 900m)
12 to 14C, perhaps warmest in the morning; fluctuating by several degrees around showers.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 28th August 2026
Last updated
Tue 25th Aug 26 at
4:29PM
How windy? (On the summits)
Southwesterly 15-25mph, some gustiness; later shifting westerly, perhaps easing for a time.
Effect of the wind on you?
Fairly small, gusty periods on high terrain.
How Wet?
Showery rain, drizzle
Often drizzly on the high tops and upper western slopes. Spotty rain drifts from the southwest, more frequent showery rain forming, for a few hours at least.
Cloud on the hills?
Fairly extensive
Hills shrouded from middle slopes up at least in the morning, rising but western slopes unlikely to break above 700-800m. Higher bases towards Carneddau for a time, but variably lowering again where heavier showery rain arrives.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of sun toward the east, otherwise cloudy. Varied visibility, though very good where out of cloud and rain.
How Cold? (at 900m)
12 or 13C.
Freezing Level
Above the summits.
Planning Outlook
Heavy, thundery rain likely affects England, Wales & southern Scotland on Thursday and Friday, potentially prolonged heavy falls bringing a risk of local flooding. A westerly wind will establish into the weekend, drawing cloud and drizzle onto western high terrain, several frontal systems sweeping more broadly across the country. The strongest wind and heavy rain may pass mostly across England and Wales, with the lightest rain in west Scotland. Best chance of cloud base rising towards higher terrain in western areas, perhaps briefly to higher summits, but the hills more often shrouded, patches to low slopes around heaviest rain. A west-southwesterly weather track prevails next week: cloud and drizzle on western hill groups (particularly west Scotland), breezy, areas of rain regularly spreading more widely.