Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday'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.
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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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.
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
Sunday 28th December 2025
Last updated
Sat 27th Dec 25 at
2:40PM
Summary for all mountain areas
High pressure brings dry and sunny conditions to the Highlands with little wind and the mountains clear, although some fog in the glens. Elsewhere, an east wind will continue to feed cloud into the Scottish Borders, N Pennines, and east Wales with scope for spots of drizzle. Still dry and sunny toward west coast.
Headline for Eryri / Snowdonia National Park
Cloud covering eastern hills. Well broken cloud in west with sun. Gusty east wind.
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?
Mostly dry
Scope for local patches of drizzle or snow grains from the cloud sheet.
Cloud on the hills?
Cloud capping upper slopes.
Cloud sheet covering higher slopes above 600-700m, mainly Carneddau and high tops near Bala, well broken cloud westwards toward coast. Highest tops near or above this cloud.
Chance of cloud free summits?
70% in west, 30% in east.
Sunshine and air clarity?
Sun best toward west coast, extensive cloud 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
Sat 27th Dec 25 at
2:40PM
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.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 30th December 2025
Last updated
Sat 27th Dec 25 at
2:40PM
How windy? (On the summits)
East to north-easterly 10 to 20mph
Effect of the wind on you?
Mostly small
How Wet?
No precipitation expected
Cloud on the hills?
Patches confined to north and east.
Patches or banks some upper slopes in the north and east. Tending to lift off through the day. Otherwise, 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
Freezing Level
600-700m
Planning Outlook
Early 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. Small amounts of precipitation, occasional showers or snow flurries. Later in the week, a stronger and colder northerly may develop with snow and hail showers becoming frequent in the north and down coastal extremities elsewhere.