Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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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Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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
Thursday 18th September 2025
Last updated
Wed 17th Sep 25 at
4:30PM
Summary for all mountain areas
Strong upland wind or gales across the mountains. Frontal wave bringing persistent, heavy rain and extensive cloud from North Wales to the Southern Uplands. Highlands drier, especially east of A9, but showery near the west and north-west coast in the morning. Temperatures mild but with notable wind chill.
Headline for Eryri / Snowdonia National Park
Strong upland wind. Persistent rain & extensive cloud.
How windy? (On the summits)
Southwesterly 35 to 45mph, risk 50mph at times. Marked increase with height. Powerful turbulent gusts.
Effect of the wind on you?
Difficult walking conditions will make progress challenging. Very powerful gusts, especially in passes, may easily blow you over. Marked wind chill.
How Wet?
Persistent, especially west coast
Soon persistent rain, possibly heavy at times, near the west coast, encroaching further in land at times mostly as light rain. West-coastal up-slopes remaining drizzly all day.
Cloud on the hills?
Extensive
Extensive cloud down to lower west-coastal slopes. Further inland cloud base will rise to 600m in the afternoon.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Little or no sunshine. Excellent visibility inland below cloud deck; hazier near the coast.
How Cold? (at 900m)
13C. Feeling between 0 and 5C in the wind.
Freezing Level
Well above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 19th September 2025
Last updated
Wed 17th Sep 25 at
4:30PM
How windy? (On the summits)
Southwesterly 30 to 40mph, strongest over Yr Wyddfa/Snowdon range, very gusty in places around tops and some passes.
Effect of the wind on you?
Very blustery, affecting balance where exposed on tops and ridges, gusty in places to lower slopes. Marked wind chill.
How Wet?
Rain or drizzle most of the day west
Persistent rain or drizzle over Eryri/Snowdonia NP, risk becoming heavier at times. Only small amounts reaching the Berwyn Mountains.
Cloud on the hills?
Extensive
Cloud from lower slopes on mountains overlooking the sea. Cloud base will be higher east/north of the A5, but breaks to tops will be rare if any.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Little or no sunshine Poor visibility, locally better in east.
How Cold? (at 900m)
12C, but feeling close to 0C in the strongest wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 20th September 2025
Last updated
Wed 17th Sep 25 at
4:30PM
How windy? (On the summits)
Forecast details uncertain. Probably southerly 20 to 40mph but small chance of lull all day.
Effect of the wind on you?
Risk of arduous conditions throughout the day, with balance being affected on exposed ridges and in cols. Marked wind chill.
How Wet?
Uncertain: likely persistent, heavy rain
Substantial risk of sustained heavy rain, particularly afternoon, but chance that the frontal system may pass further north leaving a drier day.
Cloud on the hills?
Probably extensive
Hills shrouded down to lower slopes for much of the day, especially afternoon. Should rain ease earlier, cloud base will lift to mid- to upper-slopes and some breaks may develop.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Sunshine unlikely. Poor or very poor visibility.
How Cold? (at 900m)
7C. Feeling as cold as -5C in the wind.
Freezing Level
Above the summits.
Planning Outlook
Weather remains mixed into and through the weekend, often with high winds, regions of persistent rain and extensive cloud. Temperatures falling through Saturday across the UK with the higher Scottish summits dropping below freezing and frosts in some glens. Looking increasingly likely that high pressure will take hold from the north on Sunday evening, bringing a period of more settled weather across the country for a couple of days at least, perhaps longer.