Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
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.
Click an icon for more information or click here for a key to all icons.
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
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
Sunday 30th November 2025
Last updated
Sat 29th Nov 25 at
4:30PM
Summary for all mountain areas
A fine day for many places, sunshine and broken cloud. Much terrain frozen in the Highlands, where a lull in wind, later strengthening southerlies in west. Strong northwesterlies for England and Wales tend to drop. Some local showers move inland from the Irish Sea. Deteriorating all areas into night.
Headline for Eryri / Snowdonia National Park
Chilly breeze, gales into night. A few showers, some sun.
How windy? (On the summits)
Northwesterly 20-30mph up to dawn, soon easing westerly 15mph, then in afternoon southwesterly 20mph. Increasing into night southerly 50-65mph.
Effect of the wind on you?
Marked wind chill and blustery at first, soon lessening. Deteriorating into night.
How Wet?
Brief showers, flurries tops
Wet underfoot, or icy on higher terrain with a dusting of fresh snow on some tops, mainly in northern areas. Occasional showers mostly near to west coasts, 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; high cloud builds later in day from west. Visibility excellent out of cloud.
How Cold? (at 900m)
0 or -1C, then rising after dark, reaching 5C by middle of night. Feeling like -8C if exposed to wind early morning.
Freezing Level
800 to 900m; lifting above tops later evening into night.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 1st December 2025
Last updated
Sat 29th Nov 25 at
4:30PM
How windy? (On the summits)
South to southwesterly 45 to 60mph much of the daytime, powerful gusts in places downslope to north; may lessen later.
Effect of the wind on you?
Difficult conditions most or all day, challenging balance, gusts may knock you over; significant wind chill.
How Wet?
Prolonged heavy rain
Rain rarely ceasing all day, sustained heavy falls particularly western hills. Breaking up into showers into night. Very wet underfoot with flooding developing.
Cloud on the hills?
Extensive
Blanket cloud across the hills, to mid-slopes or lower on west coast hills. Highest cloud base toward north of Ogwen valley, at times above 700m.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast and dull. Poor visibility.
How Cold? (at 900m)
6C, later in day starting to drop. Wind chill feeling like -7C in exposure on higher areas.
Freezing Level
Rising from overnight, staying above freezing to the tops all daytime. May then lower into night onto higher tops.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 2nd December 2025
Last updated
Sat 29th Nov 25 at
4:30PM
How windy? (On the summits)
Southwesterly 20 to 25mph, at times squally gusts 30-35mph.
Effect of the wind on you?
Breezy, at times more blustery over tops, starting to affect comfortable walking and balance on ridges. Marked wind chill.
How Wet?
Frequent hail showers west; flooding
Showery bursts coming inland from Cardigan Bay, with hail, at times snow falling on highest tops; chance isolated thunder. More often dry eastern hills. Wet underfoot, streams in spate, possible flooding after previous rain.
Cloud on the hills?
Mostly western tops
Often covering western hills, bases varied above 600 to 900m, lowest and most persistent near west coast up to Llyn peninsula. Best breaks toward northeast from Ogwen and hills around Bala/Berwyn.
Chance of cloud free summits?
30% west, to 60% inland/north/east.
Sunshine and air clarity?
Glimpses of sun mostly toward east and north, where visibility often very good. Reduced to poor at times in showers.
How Cold? (at 900m)
1 or 2C. Wind chill feeling like -5 to -8C.
Freezing Level
1000m or just above.
Planning Outlook
Areas of low pressure circulating to the west and north will dominate the weather pattern in the week ahead, bringing generally unsettled weather. Southwesterly air and briefly milder into Monday, with rain for most places at times, but prolonged heavier rain for England and Wales. Then typically cooler with showery conditions - higher mountains near or just below freezing point likely for the remainder of the week - some snow on tops, occasional hail. Wind speed likely to vary, some squally gusty spells, but also some lulls possible during the week.