Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday'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.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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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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.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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
Friday 19th December 2025
Last updated
Thu 18th Dec 25 at
4:25PM
Summary for all mountain areas
Southwesterly gales, severe across the Highlands, giving significant wind chill and showers. Showers frequent western Scotland, with snow falling down to 800m with hail and risk lightning. Scattered showers for England and Wales where hill fog confined to western tops.
Headline for Eryri / Snowdonia National Park
Widespread gales with scattered showers and feeling cold. Sun best in the east.
How windy? (On the summits)
Southwesterly 35 to 50mph, strongest northern tops in the morning, tending to lessen a little during day.
Effect of the wind on you?
Arduous conditions over higher mountains, frequent buffeting in exposure in morning. Significant wind chill.
How Wet?
Occasional showers with hail
Passing showers mostly morning, with hail briefly, falling as snow above 800m. Fading to be brief or rare afternoon.
Cloud on the hills?
Mostly high tops with breaks
Varying cloud bases, but often capping high tops above 800m in morning, some breaks more often afternoon. Clearer well inland and east Wales much of day.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Bursts of sun, most frequent east. Visibility mostly very good.
How Cold? (at 900m)
0 to 2C. Feeling like -12C directly in the wind.
Freezing Level
900 to 1000m, rising slightly just above tops later or after dark.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 20th December 2025
Last updated
Thu 18th Dec 25 at
4:25PM
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?
Patchy rain, becoming persistent from west.
Patches of rain or drizzle here and there, may well become increasingly persistent from the west coast as front edges in. Very little in east and hills north of the A5.
Cloud on the hills?
Extensive
Cloud covering hills extensively, especially as rain moves in. Bases around 500-800m, lowest west coast. Higher bases at times north of the A5.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Very likely overcast. Visibility good at times, but poor in rain.
How Cold? (at 900m)
2 or 3C
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 21st December 2025
Last updated
Thu 18th Dec 25 at
4:25PM
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
Planning Outlook
A switch to east-southeasterly winds by Sunday into early next week, some residual rain and high-level snow, but a drier and colder theme develops into the Christmas period and perhaps into the New Year, as high pressure builds to the north and northeast. 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.