Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
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.
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
Monday 8th December 2025
Last updated
Sun 7th Dec 25 at
4:24PM
Summary for all mountain areas
Southwesterly winds often gale force over most higher terrain of Britain, less strong toward the north of the Highlands. Close to freezing only on higher Scottish tops. Rain frequent over western Scotland, some patchy rain passing eastwards. Showery rain common on some western hills in England and Wales.
Headline for Eryri / Snowdonia National Park
Windy, gales on high tops. Showery rain, cloud on tops.
How windy? (On the summits)
Southwesterly 40 to 55mph from dawn into morning, moderating a little, but often in range 35 to 45mph over higher mountains all day. Briefly easing further into evening, but then onward into night rapid increase to 70mph+.
Effect of the wind on you?
Strenuous walking with buffeting in exposure all day, making balance challenging on high tops, more difficult early. Considerable wind chill. Deteriorating as a storm develops onward into night.
How Wet?
Rain on and off
Showery rain most frequent over western hills, at times patchy rain more widely, but occasionally drier all areas. Rain develops from south toward midnight, setting in heavy.
Cloud on the hills?
Varied, mostly higher western areas
Frequently capping higher slopes in Snowdon group and near to Cardigan Bay, bases varied 600-900m; better breaks north/eastward though risk filling in for periods.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Little sun expected, only weak glimpses east Wales. Visibility good where dry, but reduced for periods in showers.
How Cold? (at 900m)
4 or 5C, a slow rise as the day goes, reaching 7C into night. If exposed to stronger winds, feeling like -8C on high tops.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 9th December 2025
Last updated
Sun 7th Dec 25 at
4:24PM
How windy? (On the summits)
South-southwesterly 55-65mph, gusts reaching 75mph. Easing into nighttime, trending southwesterly.
Effect of the wind on you?
Widely difficult conditions making any mobility tortuous - risk severe in exposure. Significant wind chill.
How Wet?
Early heavy rain then showers, flooding
Incessant heavy rain from overnight lingers after dawn. Rain breaks into showery bursts through morning, mostly west, risk broader areas returning. Beware fast-rising streams and local floods.
Cloud on the hills?
Extensive, local improvements later
Blanket cloud from middle or lower slopes up through the morning, always lowest on western slopes. Breaks to middle slopes occurring afternoon, chance of breaks up to 700-800m Carneddau/east Wales.
Chance of cloud free summits?
Less than 10%, 20% east Wales later
Sunshine and air clarity?
Overcast and dull. Poor visibility.
How Cold? (at 900m)
9 or 10C, sharply dropping afternoon towards 5C by nightfall. Feeling as cold as -10C in afternoon wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 10th December 2025
Last updated
Sun 7th Dec 25 at
4:24PM
How windy? (On the summits)
Southwesterly 40 to 50mph, risk gusts 60mph over higher mountains.
Effect of the wind on you?
Challenging walking conditions over the hills, difficult in places on higher terrain; considerable wind chill.
How Wet?
Showers
Showery rain on and off, most frequent western areas.
Cloud on the hills?
Frequently on western high tops
Cloud base varying, but often capping higher summits toward the west, better breaks north and east of Ogwen.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Bursts of sun most frequent toward north/east. Slight haze west, poorer in showers.
How Cold? (at 900m)
3 or 4C. Wind chill feeling like -10C.
Freezing Level
Above the summits
Planning Outlook
A very unsettled spell through the next 10 days as southwesterly winds prevail and low pressure systems move in from the Atlantic. Stormy conditions widely over the mountains on Tuesday, gales remaining severe on high terrain into Wednesday, then potentially intensifying again on Thursday. Temperatures only close to freezing on higher Scottish tops this week, even here will experience spells above freezing with thawing, leaving snow increasingly patchy, but beware some icy surfaces on the very highest tops where some refreezing occurs. Rainfall will be frequent and heavy, sometimes showery with hail. Expect wet ground conditions and further flooding of streams and some rivers.