Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Dry, Inversion
Banks of cloud or fog on lower or middle slopes, but higher terrain likely clear and sunny above an inversion.
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.
Dry, Inversion
Banks of cloud or fog on lower or middle slopes, but higher terrain likely clear and sunny above an inversion.
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
Saturday 27th December 2025
Last updated
Fri 26th Dec 25 at
4:22PM
Summary for all mountain areas
Chilly easterly winds, strongest and gustiest Wales, with extensive cloud sheet eastern and into central areas, with some patchy light precipitation. Sun best western hills, and also where tops breaks above an inversion around 1000m. Terrain partly frozen, morning frost valleys; but up to plus 5C western tops above inversion.
Headline for Eryri / Snowdonia National Park
Chilly and gusty east wind. Blowing in cloud to eastern hills. Best sun in west.
How windy? (On the summits)
Easterly 30 to 40mph, very gusty around some tops, high passes and downslope toward the west.
Effect of the wind on you?
Affecting comfortable walking and balance over tops and ridges, sudden buffeting gusts in places; considerable wind chill.
How Wet?
Rare if any light rain
Largely dry; chance of an odd brief spot of light rain mainly eastern hills.
Cloud on the hills?
Mostly high tops toward north/east
Cloud banks mostly above 500-700m and in areas from Carneddau to hills near Bala perhaps increasingly extensive; patchier westwards, where often clearing. Highest tops may be near top of cloud layer.
Chance of cloud free summits?
Lowering to 40% east, 90% near west coast.
Sunshine and air clarity?
Fairly cloudy, but best sun in the west. Visibility very good.
How Cold? (at 900m)
1 to 3C, but slightly warmer on highest summits and some western slopes. Feeling like -10C directly in the wind.
Freezing Level
Some terrain partly frozen; close to freezing some upper slopes and patchy slight frost in sheltered valleys in morning.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 28th December 2025
Last updated
Fri 26th Dec 25 at
4:22PM
How windy? (On the summits)
Easterly 15 to 25mph, some stronger gusts possible around higher mountains.
Effect of the wind on you?
Fairly small, but noticeably blustery and gusty around exposed tops and ridges, giving marked wind chill.
How Wet?
Dry all day
Cloud on the hills?
Patches some upper slopes
Thin banks of cloud grazing higher slopes above 700m, mainly Carneddau and high tops near Bala, well broken westwards. Highest tops near or above this cloud.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Sun best toward west coast, broken cloud and sun elsewhere. Visibility very good, some distant haze.
How Cold? (at 900m)
0 or -1C. Feeling like -8C directly in the wind.
Freezing Level
Near or just below freezing above 700m, also frost some sheltered valleys in morning.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 29th December 2025
Last updated
Fri 26th Dec 25 at
4:22PM
How windy? (On the summits)
Northeasterly 10 to 15mph, but tending to lift to 15 to 25mph through the day.
Effect of the wind on you?
Mostly small, but increasingly considerable wind chill where exposed to the wind.
How Wet?
No precipitation expected
Cloud on the hills?
Banks mostly across eastern hills.
Banks of low cloud may affect eastern hills with bases around 500-700m. Further west, much patchier cloud will the mountains mostly clear.
Chance of cloud free summits?
80% in west, 40% in east.
Sunshine and air clarity?
Cloudiest in the east, best sun in the west. Visibility mostly very good outside of any precipitation.
How Cold? (at 900m)
Around 0C
Freezing Level
Near or just below freezing above 500-700m, also frost some sheltered valleys in morning. Highest tops may reach 2C above an inversion.
Planning Outlook
Next week, high pressure still dominates, but generally colder air becoming entrained into its circulation from the north, which sees lower temperatures on high terrain, sub-zero over most mountains through New Year. Small amounts of precipitation, occasional showers or snow flurries, winds north or northwesterly.