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.
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.
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
Wednesday 31st December 2025
Last updated
Tue 30th Dec 25 at
4:28PM
Summary for all mountain areas
Much terrain frozen, frost into valleys and glens in the morning, all day out of sunlight, but temperature and freezing level tending to lift toward 800m from west. Showery rain and hill snow moving into W-NW Scotland. Wind strengthening, becoming gales over tops in Scotland during day, then N England after dark.
Headline for Eryri / Snowdonia National Park
Increasing breeze. Dry, sun then cloudier.
How windy? (On the summits)
Northwesterly 15mph or less at in morning, lifting to 20 to 25mph afternoon, then 30-35mph into night.
Effect of the wind on you?
Mostly small, but marked chill as wind picks up later.
How Wet?
No precipitation during daytime
After dark, odd light showers or snow flurries on higher terrain mostly in west.
Cloud on the hills?
Patchy coverage over tops
Generally small amounts, other than a few patches on some tops. In the afternoon, in westerly airflow, banks start to develop more widely over tops, mostly above 700m.
Chance of cloud free summits?
80% later 50%
Sunshine and air clarity?
Bright start with sun through high cloud, but cloud building from west. Visibility mostly very good or excellent.
How Cold? (at 900m)
-2C. Feeling like -7 to -10C in the strongest wind toward evening.
Freezing Level
All levels in morning, below freezing with widespread frost into valleys, but lifting to 500-700m.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 1st January 2026
Last updated
Tue 30th Dec 25 at
4:28PM
How windy? (On the summits)
Northwesterly 25 to 40mph, strongest higher tops in the north, squally gusts in showers.
Effect of the wind on you?
Strenuous walking, frequent buffeting in exposure higher up. Significant wind chill.
How Wet?
Locally frequent showers, snow and hail
Showers moving inland from the Irish Sea, locally clustering together into bands of more frequent precipitation, falling as snow above 500-600m, possible hail.
Cloud on the hills?
Varied over tops
Cloud base constantly changing, but often capping higher slopes, bases 600-900m, lowest most often near coast. Brief breaks higher up more frequent eastward.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Largely cloudy, some bursts of sun. Visibility varying, very poor in snow and cloud, intermittently very good.
How Cold? (at 900m)
-1 or -2C. Wind chill feeling like -10 to -13C.
Freezing Level
Up to dawn near to freezing to some lower slopes, then rising to 600-800m, highest near the coast.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 2nd January 2026
Last updated
Tue 30th Dec 25 at
4:28PM
How windy? (On the summits)
North-northwesterly 25 to 30mph, squally gusts 35-40mph at times in showers.
Effect of the wind on you?
Significant wind chill over the mountains. Blustery, buffeting gusts sometimes affecting balance on exposed terrain.
How Wet?
Frequent snow and hail
Heavy showers coming inland from northern coasts, locally banding into frequent snow and hail falling to lower slopes, rain only lower coastal areas. Risk of isolated thunder.
Cloud on the hills?
Most frequent high tops in north
Often capping higher slopes above 800-900m, patches to 600m mainly on slopes toward coasts in showers. Brief breaks above higher tops, more often mid-Wales.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Brief bursts of sun. Visibility very poor where in snow and cloud, but intermittently very good.
How Cold? (at 900m)
-3 or -4C. Wind chill feeling like -12 to -15C on tops.
Freezing Level
400 to 500m. Soon widely dropping below freezing from valleys upward into evening.
Planning Outlook
Significantly cold wintry conditions into the start of January. Air temperature well below freezing on high terrain, plus low minima into many glens and valleys with sustained hard frost. Strong northerly winds later this week giving severe wind chill. Frequent and heavy snow showers moving into northern areas and running down coastal extremities with significant accumulations. Elsewhere, lots of dry and sunny weather, although occasional organised bands of snow will feed south at times in the Arctic airflow. Staying cold into next week with scope for snowfalls more widely.