Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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.
Heavy snow and hail showers, isolated lightning
Showery precipitation, often heavy, may merge to become constant for periods. A mix of snow and hail often falling to lower slopes. Risk of very localised thunder and lightning.
Whiteout
Fog and lying snow over the mountains, possibly with falling or blowing snow, very disorientating. Map and compass essential, beware of unseen hazards.
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.
Heavy snow and hail showers, isolated lightning
Showery precipitation, often heavy, may merge to become constant for periods. A mix of snow and hail often falling to lower slopes. Risk of very localised thunder and lightning.
Whiteout
Fog and lying snow over the mountains, possibly with falling or blowing snow, very disorientating. Map and compass essential, beware of unseen hazards.
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
Wednesday 19th November 2025
Last updated
Tue 18th Nov 25 at
4:00PM
Summary for all mountain areas
Strong to gale-force northerly winds; severe chill factor on the mountains. Terrain widely frozen with fresh snow cover. Snow and hail showers frequent in the northern Highlands. Showers also north/west Wales. From the central Highlands into northern England, generally dry with sunshine and very clear air.
Headline for Eryri / Snowdonia National Park
Bitterly cold; squally gales on tops. Local snow/hail, some sun.
How windy? (On the summits)
Northerly 35 to 40mph, sustained speeds strongest early morning up to 50mph, but also at times 45-50mph during squally gusts in showers much of day.
Effect of the wind on you?
Challenging to often difficult walking conditions on higher exposed terrain, significant wind chill, severe in places higher up.
How Wet?
Locally frequent snow and hail north
Snow and hail showers coming in frequently from the north, locally banding together to give lines of more constant precipitation, mainly Snowdon range westward. Chance of isolated lightning.
Cloud on the hills?
Fairly extensive higher northern areas
Cloud base constantly changing, but often shrouding north-facing mountains above 600-800m, some lower shafts of cloud in showers. Brief breaks higher up mostly inland, best south of Bala.
Chance of cloud free summits?
30%, to 50% mid-Wales.
Sunshine and air clarity?
Brief bursts of sun, mostly inland and southwards. Visibility at times appalling when in cloud and snow, but intermittently very good.
How Cold? (at 900m)
-4C. Wind chill feeling like -15C, to -20C in stronger speeds.
Freezing Level
500m, briefly lower in heavy showers; also frost in some inland valleys after dawn, again soon from dusk.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 20th November 2025
Last updated
Tue 18th Nov 25 at
4:00PM
How windy? (On the summits)
Northerly 35 to 40mph, squally gusts in showers, at times risk toward 50mph.
Effect of the wind on you?
Continued 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
Tue 18th Nov 25 at
4:00PM
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, risk 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.
Planning Outlook
Prepare for winter conditions - snow covering many mountains to lower slopes in Scotland, snow and ice cover varied for England & Wales, but much terrain frozen; hard frosts into inland valleys and glens the next couple of nights. Continuing strong northerlies into Thursday, showery snow and hail gradually fading from northwest Scotland. A front moving into Scotland from the west on Friday brings gales and snow, turning to rain lower down - in England & Wales more likely develops 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.