Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday'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.
Clear
Excellent or superb visibility, no navigation issues.
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.
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.
Clear
Excellent or superb visibility, no navigation issues.
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.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 24th May 2026
Last updated
Sat 23rd May 26 at
5:17PM
Summary for all mountain areas
High pressure bringing dry and warm conditions to England and Wales and southern and eastern Scotland with early patchy hill fog in the west dispersing. Warm or very warm in valleys, beware of sunburn and dehydration. Blustery south-westerly winds will feed low cloud and drizzly rain across northwest Scotland.
Headline for Eryri / Snowdonia National Park
A dry and increasingly very warm day with extensive and strong sunshine.
How windy? (On the summits)
South to south-westerly 10 to 15mph
Effect of the wind on you?
Mostly negligible
How Wet?
Dry
Cloud on the hills?
Mountains clear
Aside from some patches of banks across coastal hills early in morning, which will burn off, hills are expected to be clear.
Chance of cloud free summits?
Greater than 90%
Sunshine and air clarity?
Extensive sunshine coming through. Very good visibility.
How Cold? (at 900m)
12C lifting to 16C
Freezing Level
Well above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 25th May 2026
Last updated
Sat 23rd May 26 at
5:17PM
How windy? (On the summits)
South to south-westerly 10mph.
Effect of the wind on you?
Small
How Wet?
Dry
Cloud on the hills?
Mountains clear
Any early mist will soon disperse to leave the mountains clear.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Widespread and strong sunshine. Good visibility, but slight haze.
How Cold? (at 900m)
18C, humid
Freezing Level
Well above the summits. Valley temperatures inland reaching high 20s. Cooling sea breezes for coastal hills.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 26th May 2026
Last updated
Sat 23rd May 26 at
5:17PM
How windy? (On the summits)
Varying in direction, 5-10mph or less; perhaps locally up to 15mph some coastal hills where sea breezes develop.
Effect of the wind on you?
Mostly negligible
How Wet?
Substantially or completely dry
Very likely dry, but risk of cloud bubbling up in the afternoon inland to give an isolated, but should they occur, slow-moving shower.
Cloud on the hills?
Mountains clear
Perhaps some early fragments of mist and low cloud, mainly around coastal hills in the west. Otherwise, hills clear.
Chance of cloud free summits?
Sunshine and air clarity?
Widespread sunshine, but areas of cloud may bubble up in the afternoon. Visibility mostly good or very good, but slight haze.
How Cold? (at 900m)
16 to 18C, humid. Hottest mid Wales where valley temperatures will rise to 25 to 27C.
Freezing Level
Well above the summits
Planning Outlook
High pressure dominates this week with early patchy low cloud, mainly coastal hills dispersing to give widespread warm or very warm sunshine, highest temperatures valleys of England and Wales; where into the high 20s Monday and Tuesday Peak District into Wales with high humidity. Chance of well scattered shower development from midweek as a gusty south-easterly develops for western hills. Pressure lowering next weekend into next week.