Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday'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
Tuesday 30th December 2025
Last updated
Mon 29th Dec 25 at
4:20PM
Summary for all mountain areas
Quiet but chilly conditions, light winds and plenty of sunshine for much of the Highlands, much terrain frozen, sub-zero all day over hills and in some glens. A cold east-northeasterly breeze England and Wales, strongest toward south; fairly cloudy, locally an odd snow flurry over the Pennines.
Headline for Eryri / Snowdonia National Park
Cold wind. Dry, patchy cloud, some sun best in west.
How windy? (On the summits)
East to northeasterly 15 to 25mph, typically strongest in the morning.
Effect of the wind on you?
Fairly small, but blustery early in day and marked chill where exposed to the breeze.
How Wet?
No precipitation expected
Cloud on the hills?
Patches mostly tops north and east
Patches or banks some upper slopes in the north and east. Tending to lift off through the day. Further west toward coast, hills mostly clear.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Broken cloud and sun. The sun best in the west. Visibility very good or excellent.
How Cold? (at 900m)
-2C. Wind chill feeling like -8 to -10C.
Freezing Level
600-700m
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 31st December 2025
Last updated
Mon 29th Dec 25 at
4:20PM
How windy? (On the summits)
North-westerly 15mph at first, lifting to 20 to 30mph.
Effect of the wind on you?
Mostly small, but marked chill as wind picks up later.
How Wet?
No precipitation expected
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 may develop more widely over tops.
Chance of cloud free summits?
70% later 40%
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.
Freezing Level
All levels at first, following widespread frost into valleys, but lifting to 500-700m.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 1st January 2026
Last updated
Mon 29th Dec 25 at
4:20PM
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.
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.