Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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.
Chilly
Air temperature typically 0 to 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.
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.
Chilly
Air temperature typically 0 to 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
Tuesday 18th November 2025
Last updated
Mon 17th Nov 25 at
4:00PM
Summary for all mountain areas
Extensive snow Scottish Highlands, falling to lower elevations inland, later showers of snow & hail in north/west. Wind varied in Scotland, then strengthening northerlies. Rain and some snow over higher tops England and Wales plus westerlies up to gale force. Cloud covering most higher terrain.
Headline for Eryri / Snowdonia National Park
Windy, gale-force at times. Rain frequent all day, heavy bursts.
How windy? (On the summits)
Westerly soon strengthening from 25-30mph or slightly less just before dawn, to suddenly squally 35-40mph. May moderate slightly, then during afternoon typically stronger again, often 40mph. Into night, switching northerly 40-45mph.
Effect of the wind on you?
Walking likely strenuous much of the day with considerable wind chill; conditions generally deteriorating, more difficult into night.
How Wet?
Often raining, heavy at times, some sleet high tops
Showers starting with some sleet or briefly snow on higher tops in morning, soon merging into larger areas of rain, heavy at times, chance of hail; rain extending further inland during morning and setting in for periods.
Cloud on the hills?
Extensive higher western areas
Banks of cloud covering western hills all day, bases varied in and out of rain 600-800m. Some early breaks east, particularly Berwyn group where summits clear for a few hours. Cloud fills in more widely and often as rain sets in.
Chance of cloud free summits?
50% east morning, lowering widely to 20%
Sunshine and air clarity?
Bright in the east in the morning, otherwise overcast most of the day. Excellent visibility at first in east, turning poor with rain, very poor on high ground.
How Cold? (at 900m)
0 or +1C; then into night dropping to -2C. Feeling like -12C in direct wind, then into night -15C.
Freezing Level
800-900m from dawn, slight frost some sheltered valleys. Rising just above freezing on high tops late morning onward, then into night dropping to 600m.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 19th November 2025
Last updated
Mon 17th Nov 25 at
4:00PM
How windy? (On the summits)
Northerly 35 to 40mph, squally gusts in showers.
Effect of the wind on you?
Often challenging walking conditions on higher exposed terrain, significant wind chill, severe in places higher up.
How Wet?
Locally frequent snow and hail
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%
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)
-3C. Wind chill feeling like -15C to near -20C in stronger speeds.
Freezing Level
600m, 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
Mon 17th 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?
Locally frequent snow and hail
Ongoing locally very frequent snow and hail showers coming in from the north, but nearby seeing much less. Greatest risk of showers Carneddau to Snowdon range. Chance of isolated lightning.
Cloud on the hills?
Fairly extensive higher northern areas
Cloud base continuing to vary, but often shrouding north-facing mountains above 600-800m, some lower shafts of cloud in showers. Brief breaks higher up mostly inland toward mid-Wales.
Chance of cloud free summits?
30%
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)
-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.
Planning Outlook
Snow lying most widely in Scottish Highlands, to lower slopes inland, some high tops elsewhere into midweek. Strong to gale force northerlies Wednesday-Thursday, bringing snow and hail showers focused on northern Scotland and onto north-facing coastal districts elsewhere. Sunnier from central Scotland southward through northern England. By Friday into next weekend, winds shift back westerly and freezing levels rise to upper slopes - some rain likely, snow on high tops at times.