Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday'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.
Snow and hail showers
Periods of bright or sunny conditions mixed with showers or flurries of snow and hail. Visibility may change rapidly from excellent to very poor.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Winter kit required on higher terrain
Snow cover over higher mountains. Safe progress over some terrain will require suitable footwear - possibly crampons and ice-axe where necessary.
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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.
Snow and hail showers
Periods of bright or sunny conditions mixed with showers or flurries of snow and hail. Visibility may change rapidly from excellent to very poor.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Winter kit required on higher terrain
Snow cover over higher mountains. Safe progress over some terrain will require suitable footwear - possibly crampons and ice-axe where necessary.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 20th November 2025
Last updated
Wed 19th Nov 25 at
3:00PM
Summary for all mountain areas
Staying cold as northerly winds continue, speeds starting to lessen gradually Scotland. Snow/hail showers in N Scotland, slowly fading. Showers also Cheviots, locally N/W Wales. Mostly sunny elsewhere. All terrain frozen; extensive snow cover over mountains, most substantial NW Highlands & Cairngorms.
Headline for Eryri / Snowdonia National Park
Bitter wind up to gale force. Snow showers north, fading.
How windy? (On the summits)
Northerly 30 to 40mph, squally gusts in showers.
Effect of the wind on you?
Challenging walking conditions over the mountains, significant wind chill, severe in places higher up.
How Wet?
Snow flurries mostly north
Snow flurries and hail showers at times over Carneddau to north Snowdon group. Further west, a band of snow and hail showers over the Irish Sea likely to run across Llyn peninsula, may drift out to sea.
Cloud on the hills?
Most frequent higher northern areas
Cloud base continuing to vary, but often drifting over north-facing mountains above 600-800m. Breaks higher up inland toward mid-Wales, more often clear some slopes.
Chance of cloud free summits?
30% north, to 70% mid Wales.
Sunshine and air clarity?
Brief bursts of sun north, sunnier inland and southwards. Visibility locally very poor when in cloud and snow, but often very good.
How Cold? (at 900m)
-3C. Wind chill feeling like -15C to near -20C in stronger speeds.
Freezing Level
500-600m, but inland terrain part-frozen to lower slopes, all day out of sunlight.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 21st November 2025
Last updated
Wed 19th Nov 25 at
3:00PM
How windy? (On the summits)
North-northwest turning west later southwesterly, 10 to 20mph, tending to increase into evening-night to 30-40mph.
Effect of the wind on you?
Mostly small during daytime, then likely to deteriorate from dusk onward.
How Wet?
Precipitation unlikely until night
Most likely all daytime dry. Into night, rain developing from west, snow on higher terrain for a time.
Cloud on the hills?
Little if any
Hills widely clear possibly all day. Into afternoon, some patches may form on slopes near west coast.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Sun through high cloud, tending to thicken from west, may become obscured later. Visibility excellent, possible mist or haze in some valleys.
How Cold? (at 900m)
-2C, slight rise toward 0C afternoon, then just above into night. If wind increases, feeling near -10C later.
Freezing Level
Much inland terrain frozen in morning, all day out of sunlight. Near coast up to 700m, then into night widely to upper slopes.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 22nd November 2025
Last updated
Wed 19th Nov 25 at
3:00PM
How windy? (On the summits)
Southwesterly 40mph at first, risk 50mph prior to dawn, easing to 20-25mph. May become more variable later.
Effect of the wind on you?
Challenging conditions around and before dawn, improving, but still noticeably breezy with marked wind chill on high tops.
How Wet?
Rain fades for a time
Rain from overnight through to dawn, may persist onward into morning, some heavier moments. Tending to ease off and become patchy for a time, locally drier afternoon. Risk of rain returning persistently into evening.
Cloud on the hills?
Extensive, some rising into afternoon
Shrouding the hills widely, banks to some lower elevations in morning. Base tending to rise to 600-800m, lowest near coast, higher breaks Carneddau to Berwyn and Bala groups afternoon.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Largely cloudy, brief glimpses of sun north of the A5. Misty and dull, some improvement if rain fades.
How Cold? (at 900m)
2 or 3C. Feeling like -5C in the wind, nearer -10C perhaps just at first.
Freezing Level
Above the summits, but some highest terrain may stay at least partly frozen.
Planning Outlook
Winter conditions over the mountains - snow coverage to lower slopes in Scotland, snow and ice cover varied for England & Wales, but much terrain frozen; hard frost into inland valleys and glens into Friday. A front moving into Scotland from the west on Friday brings gales and snow, turning to rain lower down - arriving in England & Wales Friday evening-night. Less cold into the weekend, but higher mountains stay near or just below freezing, particularly Scotland; showers or locally more frequent upland snow over several days forward. Later next week looks at least briefly milder.