Includes all summits in the the northern half of Wales from Pumlumon northwards.
Eryri / Snowdonia National Park
Tuesday 20th May 2025
Last updated
Mon 19th May 25 at
4:30PM
Mostly sunny and warm in Scotland; some patchy low fog in the north at dawn. Sunny too in England and Wales, fair weather cloud building afternoon with localised showers. Local heavy bursts later in western areas (including Galloway) with chance of isolated lightning, showers more scattered across the Pennines. Fairly light wind for all.
Showers forming afternoon, isolated heavy bursts
Variable direction, 10mph or less. Brief gusts around showers in the afternoon. Shifting generally west to northwesterly later afternoon into evening with breezes up to 15mph.
Negligible
Showers forming afternoon, local heavy bursts
Chance of an odd spot of rain from high cloud in the morning in eastern areas. Increasing risk of showers forming through the afternoon; isolated heavy bursts with chance of lightning later afternoon. Greatest risk further inland and eastward.
Forming mainly in showers
Patchy mist on some slopes early morning, notably in the east if rain here; soon dissipating. Cloud then largely above the hills. Where showers form, cloud lowering onto tops, fleeing patches to lower elevations.
90%
Sunshine and high cloud; fair weather cloud building in through the afternoon, possibly fairly extensively for little sun later. Visibility excellent, some early haze.
7 or 8C, rising only slightly if at all through the day.
Above the summits
Eryri / Snowdonia National Park
Wednesday 21st May 2025
Last updated
Mon 19th May 25 at
4:30PM
Northerly 15 to 20mph, strongest winds afternoon into evening.
Fairly small
Possible showers
Risk local showers at dawn, soon fading. Chance of localised showers returns later afternoon, though amounting to little.
Clearing tops
Patches on some slopes in the morning, mainly toward north, lifting above the summits. Returning locally in showers at varied heights.
80%
Patchwork of cloud and sun; best of sun arriving into the afternoon. Visibility excellent.
7C rising to 9 or 10C.
Above the summits
Eryri / Snowdonia National Park
Thursday 22nd May 2025
Last updated
Mon 19th May 25 at
4:30PM
At dawn, northwesterly 20-25mph. Shifting northerly and easing to 15mph, some stronger breezes in the west at times.
Fairly small, some walking impeded at dawn, perhaps some brief stability effects on exposed ridges.
Outbreaks of showers afternoon
Risk of outbreaks of showers in the afternoon, chance of strong or extended spells towards mid-Wales.
High tops often covered, improving later
Banks of cloud drift over highest tops through the day, less frequent later afternoon. Possibly extensively covered above 900m for a time in the morning. Chance of dawn low sea fog on far western hills.
Chance 40% at dawn, rising to 70%
A patchwork of sunshine, chance of extended cloudy periods midday. Excellent visibility.
6 or 7C, little chance if any.
Above the summits
High pressure weakens into midweek. Some passing rain/showery bursts into Wales and England on Wednesday will lead to a mostly dry Thursday and Friday. A northerly breeze will lower temperatures; freezing levels will lower to high terrain of north and east Scotland for a time. In the short-term, ground conditions remain extensively dry, water courses are very low and the fire risk is very high. Weather turns very unsettled into the weekend as a strong frontal system arrives from the west on Friday night, bringing heavy rain and strong winds to all areas. Showers and a brisk wind will follow into the weekend.