Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday's Forecast
Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
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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Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
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
Saturday 20th December 2025
Last updated
Fri 19th Dec 25 at
7:02PM
Summary for all mountain areas
South to south-easterly winds, reaching gale force for western hills, local drizzly showers southwestern Scotland as well as Wales, with rain into Pembrokeshire later. Elsewhere, areas of weak sun and low cloud. Low cloud focused on eastern side of Pennines and also southern and eastern Highlands.
Headline for Eryri / Snowdonia National Park
Strong to gale force winds. Mostly dry, varied low cloud, mainly in the south.
How windy? (On the summits)
South to south-easterly 30 to 50mph, risk 60mph western hills at times.
Effect of the wind on you?
Walking arduous, or near west coast difficult, with a very turbulent airflow. Significant wind chill and buffeting.
How Wet?
Mostly dry, bar isolated showers coast.
Mostly dry, bar isolated showers west coast. Into the night, risk of rain moving in from the west as a weakening front edges in.
Cloud on the hills?
Breaks in north, covering hills in south.
Varied cloud banks over the hills. Most widespread on upper slopes or tops from mid wales to the Berwyns. Occasional patches over the tops further north but generally good breaks.
Chance of cloud free summits?
40% in the south, 60% in the north.
Sunshine and air clarity?
Very likely overcast. Visibility good at times, but poor in rain.
How Cold? (at 900m)
2 or 3C. Directly in the wind feeling like -10 to -13C.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 21st December 2025
Last updated
Fri 19th Dec 25 at
7:02PM
How windy? (On the summits)
Easterly 25 to 40mph
Effect of the wind on you?
Very blustery, gusty winds, with sudden, strong gusts running downslope from ridges and passes. Significant wind chill.
How Wet?
Rain may become heavier and persistent
Patches of rain or drizzle at first, but through the day a batch of heavier and more persistent rain may well spread up from the south.
Cloud on the hills?
Widespread, especially in rain
Hill fog will very likely be extensive across the hills through the day. Best of any breaks will be toward the west coast.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Extensively dull. Visibility perhaps good at times, but marked haze and poor when in rain.
How Cold? (at 900m)
Around 2 or 3C
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 22nd December 2025
Last updated
Fri 19th Dec 25 at
7:02PM
How windy? (On the summits)
Southeasterly 15 to 25mph
Effect of the wind on you?
Blustery at times with marked wind chill where exposed to the wind.
How Wet?
Early rain and drizzle, then drying up
A warm front and its widespread rain clears early, but further patches of rain or drizzle may follow, mainly to eastern and southern hills. Otherwise drying up.
Cloud on the hills?
Fairly extensive, but breaks west coast.
Extensive at varying heights in rain. As rain clears, varied conditions with banks widely on some hills, whilst cloud lifting off other nearby hills, at least for a time.
Chance of cloud free summits?
20%, but 60% westernmost hills.
Sunshine and air clarity?
Little or no sun. Visibility poor in rain, but tending to become good, despite a slight haze.
How Cold? (at 900m)
2C
Freezing Level
Above the summits
Planning Outlook
A much drier and chiller theme develops into the Christmas period and perhaps into the New Year, as high pressure builds to the north and northeast and maybe later in the period overhead over Scotland when inversion conditions would be in place. An extensive cloud sheet will likely come in from the North Sea over many days with light snow showers or flurries likely, rain to lower slopes, but many areas dry. Best breaks in the west.