Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Clear
Excellent or superb visibility, no navigation issues.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Clear
Excellent or superb visibility, no navigation issues.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 17th November 2025
Last updated
Sun 16th Nov 25 at
3:00PM
Summary for all mountain areas
Cold everywhere, staying sub-zero over high terrain, plus some frost lower down in morning; considerable chill factor if exposed to wind, but speeds tending to lessen all areas. Largely dry, local snow flurries moving in northern Scotland. Some patchy cloud mostly northern half of the Highlands, sunnier elsewhere.
Headline for Eryri / Snowdonia National Park
Strongest wind early, easing. Sun and patchy cloud north.
How windy? (On the summits)
North-northeasterly 20 to 30mph in morning, strongest around dawn. Easing gradually, to 10-15mph midday into early afternoon, turning northwesterly. Rising from dusk to 20-25mph, tater 30mph into night.
Effect of the wind on you?
Walking briefly strenuous with considerable wind chill in the morning, trending towards minimal impacts.
How Wet?
Precipitation unlikely
Broadly dry all day, small chance brief spots or light snowflakes on northern mountains.
Cloud on the hills?
Only high slopes of northern hills
Cloud will come and go on high northern slopes likely all day, most frequently around Carneddau around 800m. Hills clear elsewhere.
Chance of cloud free summits?
60% northernmost tops, 90% elsewhere
Sunshine and air clarity?
A patchwork of cloud and sun on northernmost slopes, sunshine elsewhere. Excellent visibility.
How Cold? (at 900m)
-1C Feeling like -10C in strongest morning wind.
Freezing Level
700-800m. Frost some inland lower elevations at dawn as well.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 18th November 2025
Last updated
Sun 16th Nov 25 at
3:00PM
How windy? (On the summits)
Westerly 25-30mph at dawn, slowly strengthening, up to 35-40mph+ over tops into nighttime.
Effect of the wind on you?
Walking likely strenuous much of the day with wind chill; conditions slowly deteriorating, particularly into night.
How Wet?
Showers, then rain slowly sets in
Scattered showers onto western hills through the morning, some snow flurries on the high tops. Showers merging into larger areas of rain, extending further inland and setting in for periods.
Cloud on the hills?
Banks west, more widely afternoon
Banks of cloud come and go above 600m on western hills from dawn. High breaks east, particularly Berwyn group where summits may be often clear for several hours. Cloud fills in more widely and often as rain sets in.
Chance of cloud free summits?
50% lowering to 20%
Sunshine and air clarity?
Bright in the east in the morning, trending overcast with a few brighter spells. Excellent visibility, turning poor with rain, very poor on high ground.
How Cold? (at 900m)
0 or 1C. Feeling like -10C in direct wind.
Freezing Level
800-900m, including frosts in sheltered valleys. May rise to or above the high tops.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 19th November 2025
Last updated
Sun 16th Nov 25 at
3:00PM
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.
Planning Outlook
A cold week ahead, staying below freezing across all mountains, much terrain will be frozen from valleys upward. An area of low pressure and associated fronts will pass southeastward during Tuesday, bringing some persistent snowfalls, including to lower slopes particularly inland across the Highlands, some substantial accumulations over higher terrain. Strong to gale force northerlies Wednesday-Thursday, bringing snow and hail showers focused on northern Scotland and onto north-facing coastal districts elsewhere. 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.