Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Snow and rain mix
Precipitation falling mostly as snow on higher terrain, rain on low-to-middle elevations, may turn to sleet or rain higher up.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Snow and rain mix
Precipitation falling mostly as snow on higher terrain, rain on low-to-middle elevations, may turn to sleet or rain higher up.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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
Saturday 29th November 2025
Last updated
Fri 28th Nov 25 at
4:25PM
Summary for all mountain areas
Snow showers toward northern Scotland, but much of the Highlands will be dry - sunshine and cloud breaks best toward southwest; sub-zero on tops, chilly northerly breeze. England and Wales sees rain fairly widely, snow falling on higher tops; wind very variable, but risk gales developing.
Headline for Eryri / Snowdonia National Park
Rain and snow on tops becoming heavier, risk of gales later.
How windy? (On the summits)
Some uncertainty remains as a complex weather system moves slowly: Westerly 20mph, possibly less for a few hours. In afternoon shifting northerly, risk rapid increase to 40mph toward/soon after dusk.
Effect of the wind on you?
Likely fairly small for several hours, but be aware of possibly rapidly worsening conditions late in the day, significant wind chill developing.
How Wet?
Increasingly wet, snow on tops
Rain on and off at least from dawn into morning, but likely increasingly setting in for constant heavier falls north/west areas, particularly afternoon, falling as snow over higher terrain, by dusk to 700m, possibly 500m into evening.
Cloud on the hills?
Extensive higher areas
Hills shrouded by cloud most or all day, most extensive in constant rain/snow. Occasional breaks to 600-700m or above may form mainly inland and eastern hills.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Overcast. Visibility mostly poor due to rain or increasingly very poor on the tops due to snow.
How Cold? (at 900m)
0C, dropping to -2C from dusk. Feeling like -10C, risk -15C if wind speed increases late in day.
Freezing Level
900m, dropping into evening to 600-700m.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 30th November 2025
Last updated
Fri 28th Nov 25 at
4:25PM
How windy? (On the summits)
NW'ly 20-30mph early morning, strongest around dawn, easing W-SW'ly 15mph. Increasing into night S'ly 50-60mph.
Effect of the wind on you?
Marked wind chill and blustery at first, likely to soon lessen. 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, fading.
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, then rising after dark. Feeling like -8C if exposed to wind in 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
Fri 28th Nov 25 at
4:25PM
How windy? (On the summits)
Some uncertainty: South to southwesterly 45 to 60mph, may vary during day, but any lower speeds likely short-lived.
Effect of the wind on you?
Expect difficult conditions most or all day, challenging balance, gusts may knock you over; significant wind chill.
How Wet?
Prolonged heavy rain likely
Rain rarely ceasing all day, sustained heavy falls particularly western hills. 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.
Planning Outlook
After a lull on Sunday, areas of low pressure then circulating to the west and north will dominate the weather pattern into next week, 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 ahead.