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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Chilly
Air temperature below +5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
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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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Chilly
Air temperature below +5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 1st June 2025
Last updated
Sat 31st May 25 at
4:22PM
Summary for all mountain areas
Low pressure brings a cold and blustery westerly airflow. Area of rain southern Highlands southwards, will clear in morning, brighter conditions following. Showers transferring inland from west coast, concentrated NW Highlands and later NE Scotland, where risk of thunder. Turning mostly dry later in the day for England and Wales.
Headline for Eryri / Snowdonia National Park
Blustery and chilly for June. Patchy rain or drizzle with hill fog. Improving later.
How windy? (On the summits)
Westerly 35 to 40mph before midday, easing to 20 to 25mph; strongest in north.
Effect of the wind on you?
Feeling very blustery and cold on high ground and in passes where wind is squeezed. Will affect your balance. Significant wind chill. Easing later.
How Wet?
Drizzly showers becoming widespread for a time.
A largely dry day inland. Increasingly pockets of drizzle and areas of shower rain developing as a trough moves in, most widely on mountains near Cardigan Bay from Cadair Idris to western Eryri/Snowdonia NP. Mid afternoon onwards, becoming drier as drizzly showers ease off. Fine evening follows.
Cloud on the hills?
Extensive at first; all or nearly all clearing through day
Hill fog extensive through morning, lowest bases toward west coast, rising to 600-750m east Wales. Will improve, probably markedly through middle of day, following showery trough, as cloud base lifts to or above higher tops.
Chance of cloud free summits?
30% at first, rising to 80% by mid afternoon
Sunshine and air clarity?
Dull for several hours, but increasingly sunshine breaking through in afternoon. Good visibility inland, away from precipitation, hazy out to sea.
How Cold? (at 900m)
7C. Feeling as cold as -4C in the morning.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 2nd June 2025
Last updated
Sat 31st May 25 at
4:22PM
How windy? (On the summits)
Light with variable direction in the morning. Southwesterly 15 to 20mph in afternoon. Risk 35 to 45mph evening.
Effect of the wind on you?
Small or mostly small for much of the day.
How Wet?
Little or no rain
Risk of isolated drizzly pockets on mountains overlooking Cardigan Bay, particularly morning.
Cloud on the hills?
Little or none
Any patchy cloud in the morning will soon evaporate.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Widespread sunshine, becoming weaker as high cloud develops in the afternoon, later becoming overcast in the evening. Excellent visibility.
How Cold? (at 900m)
6C. Feeling below freezing in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 3rd June 2025
Last updated
Sat 31st May 25 at
4:22PM
How windy? (On the summits)
Southwesterly, 25mph, increasing up to 45mph for periods.
Effect of the wind on you?
Be prepared for arduous, if not at times difficult, conditions with significant wind chill and buffeting.
How Wet?
Scattered drizzly showers.
A scattering of drizzly showers moving inland from the west coast. Focused across western coastal hills.
Cloud on the hills?
Steady rise to tops, eastern hills clearing.
Cloud bases will rise through day to highest tops or above, becoming widely clear east Wales. Bases will linger around 700-800m western most hills.
Chance of cloud free summits?
30% in the west, 80% in the east.
Sunshine and air clarity?
A patchwork of sun coming through post front, most widely eastern parts. Visibility mostly good or very good away from showers.
How Cold? (at 900m)
7C Feeling more like below freezing in the strongest winds.
Freezing Level
Above the summits.
Planning Outlook
Atlantic low pressure systems will continue to dominate and bring a sustained period of westerly winds for the next 7 to 10 days. High rainfall western mountains, with periods of strong to gale force westerly winds bringing significant chill factor. Best of the drier and brighter weather for eastern ranges. Freezing level at times down to 1200-1400m in Scotland, bringing occasional snow to the highest Munro tops.