Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday'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.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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.
Click an icon for more information or click here for a key to all icons.
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.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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
Thursday 27th November 2025
Last updated
Wed 26th Nov 25 at
1:07PM
Summary for all mountain areas
Powerful south to south-westerly winds, bringing widespread upland gales with rain on and off, frequent or constant for western mountains, and persistent fog across the hills. Later a cold front will move in, clearing to squally showers Scotland around dusk.
Headline for Eryri / Snowdonia National Park
Gales and significant wind chill with frequent rainfall and extensive hill fog.
How windy? (On the summits)
South to southwesterly, strengthening through morning and quickly with height to 55mph where exposed on higher tops.
Effect of the wind on you?
Severe wind chill and walking difficult. Where exposed on higher areas, general mobility becoming a struggle.
How Wet?
Frequent rain and drizzle
Rain and drizzle most of the day particularly Lleyn peninsula to Snowdon Least wet east Wales where often dry.
Cloud on the hills?
Mountains persistently foggy.
Persistent cloud from 200 to 450m western mountains Lleyn peninsula to Snowdon. Elsewhere, cloud base 400 to 650m - although occasionally a little higher.
Chance of cloud free summits?
Less than 10%
Sunshine and air clarity?
Rare glimpses of weak sun lower slopes east Wales and near/north of A5. Visibility widely poor, hazy at best.
How Cold? (at 900m)
7C. Will feel as cold as minus 8C directly in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 28th November 2025
Last updated
Wed 26th Nov 25 at
1:07PM
How windy? (On the summits)
Southwesterly 35 to 45mph
Effect of the wind on you?
Be prepared for arduous conditions with significant wind chill and buffeting. Particularly gusty as showers move in.
How Wet?
Showers, frequent for periods.
Frequent showers, snow tops. Concentrated into band that will move through at some point, associated with trough, risk thunder. Timing uncertainties.
Cloud on the hills?
Often covering the tops.
Bases varying, but will often descend onto the tops, and may well be extensive for several hours, particularly as showers move through.
Chance of cloud free summits?
30%
Sunshine and air clarity?
A little sun coming through in west, but occasional in the east. Visibility sometimes poor due to rain.
How Cold? (at 900m)
1C
Freezing Level
Around 1000m
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 29th November 2025
Last updated
Wed 26th Nov 25 at
1:07PM
How windy? (On the summits)
Very low confidence: Direction varying from southwest to north-westerly as low passes through, 30 to 50mph, may ease.
Effect of the wind on you?
Be prepared for significant wind chill with considerable buffeting and arduous or difficult conditions for a time.
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?
Sunshine and air clarity?
Overcast. Visibility likely often poor due to rain or very poor on the uplands due to snow.
How Cold? (at 900m)
Around -1C
Freezing Level
Around 800m
Planning Outlook
Colder over the weekend again, but much uncertainty on the track of a small scale low on Saturday which would bring rain, upland snow and a core of strong winds for a time, most likely England and Wales. Sunday then mostly dry, bright and cold. Next week,. a long series of Atlantic lows passing north of or across Britain will bring high rainfall to western mountains together with frequent upland gales (sometimes stormy) and low cloud. Freeze-thaw cycles, with periods of fresh snow for Scottish hills especially.