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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
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
Friday 28th November 2025
Last updated
Thu 27th Nov 25 at
4:30PM
Summary for all mountain areas
Stormy conditions over Scottish mountains, easing only toward dusk; frequent or persistent rain and hill snow, heaviest western mountains. Severe gales high tops England & Wales, squally stormy gusts for a time with heavy bursts of rain. Risk of hail and isolated thunder, mainly western areas.
Headline for Eryri / Snowdonia National Park
Gales, severe at times tops. Showery bursts with hail.
How windy? (On the summits)
Southwesterly 40 to 55mph, sudden powerful squalls, gusts over 60mph around high tops for periods.
Effect of the wind on you?
Arduous conditions with significant wind chill and buffeting. Particularly gusty as showers move in.
How Wet?
Showery bursts with hail, chance thunder
Frequent showers, falling as sleet or snow on highest tops. Concentrated into band that will move through during the morning, risk hail and isolated lightning. Then ongoing brief showery bursts.
Cloud on the hills?
Often covering the tops
Bases varying, but will often descend onto the tops, and fairly extensive for several hours western tops, particularly as showers move through.
Chance of cloud free summits?
30%
Sunshine and air clarity?
A little sun coming through in west, more common in east away from showers. Visibility sometimes poor due to rain, intermittently good, though some haze near coast.
How Cold? (at 900m)
1C. Wind chill feeling like -15C.
Freezing Level
Around 1000m
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 29th November 2025
Last updated
Thu 27th Nov 25 at
4:30PM
How windy? (On the summits)
High uncertainty: Direction varying mostly from east to north-northwesterly, 30 to 50mph, may ease briefly.
Effect of the wind on you?
Be prepared for significant wind chill with considerable buffeting and arduous or difficult conditions for periods.
How Wet?
Risk of prolonged rain/upland snow
Uncertainty over track of small scale low; but scope for a prolonged period of rainfall across the hills, with snow above 700-800m.
Cloud on the hills?
Extensive in rain and snow
Hills covered widely in fog in prolonged rain and upland snow; perhaps for several hours or all day.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Overcast. Visibility likely often poor due to rain or very poor on the tops due to snow.
How Cold? (at 900m)
0C
Freezing Level
900m
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 30th November 2025
Last updated
Thu 27th Nov 25 at
4:30PM
How windy? (On the summits)
N'NW'ly 20-25mph early morning, risk stronger up to dawn, easing W'ly 15mph. Increasing into night S-SW'ly 40mph.
Effect of the wind on you?
Marked wind chill and blustery at first, likely to soon lessen. Risk deteriorating into night.
How Wet?
Local brief showers, flurries tops
Wet underfoot, or icy on higher terrain with possible fresh snow on tops from overnight. Brief light showers mostly near to coasts in morning, snow flurries above 800m.
Cloud on the hills?
Most common higher western tops
Cloud likely to often cap higher slopes in the morning, may come and go all day nearer to western coasts, but some breaks likely. Best clearer spells to tops further inland and eastwards.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Variable cloud and patchy sun. Visibility excellent out of cloud.
How Cold? (at 900m)
0 or -1C. Feeling like -8C if exposed to wind in morning.
Freezing Level
800 to 900m
Planning Outlook
Colder over the weekend with the mountains near or below freezing point, including frost into glens in Scotland by Saturday night. A small scale low on Saturday most likely affects England and Wales bringing rain, upland snow and a core of strong winds for a time. Sunday then mostly dry, bright and cold. Next week, Atlantic lows passing across or just north of Britain will bring frequent rainfall to western mountains together with upland gales. A mix of chilly westerly air and some milder southwesterlies. Freeze-thaw cycles, with periods of fresh snow mostly for Scottish hills, briefly high tops elsewhere.