Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Heavy snow and hail showers, isolated lightning
Showery precipitation, often heavy, may merge to become constant for periods. A mix of snow and hail often falling to lower slopes. Risk of very localised thunder and lightning.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Heavy snow and hail showers, isolated lightning
Showery precipitation, often heavy, may merge to become constant for periods. A mix of snow and hail often falling to lower slopes. Risk of very localised thunder and lightning.
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
Tuesday 2nd December 2025
Last updated
Mon 1st Dec 25 at
4:10PM
Summary for all mountain areas
Hail showers will frequent west coast hills fairly widely; snow on the highest tops with risk of isolated lightning. Drier inland, particularly northeast Scotland where sunny bursts will occur. Chilly, feeling cold in a brisk southwesterly wind; this easing in Wales and south Pennines afternoon.
Headline for Eryri / Snowdonia National Park
Hail showers, mostly west; breezy with flood risk
How windy? (On the summits)
Southwesterly 25-30mph, typically strongest near and north of Snowdon, at times squally gusts 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; risk flooding
Showery bursts coming inland from Cardigan Bay, mostly Y Garn and southward; risk hail, at times snow falling on highest tops with a chance of isolated thunder. More often dry eastern hills, though perhaps wetter here later. Wet underfoot, streams in spate, possible flooding after previous rain.
Cloud on the hills?
Tops and high west slopes often shrouded, patchy to the east
Often covering western hills, bases varied above 600 to 800m, 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/east.
Sunshine and air clarity?
Glimpses of sun mostly toward east and north, where visibility often very good. Reduced to poor at times where in showers.
How Cold? (at 900m)
1 or 2C. Wind chill feeling like -7 to -10C.
Freezing Level
Just above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 3rd December 2025
Last updated
Mon 1st Dec 25 at
4:10PM
How windy? (On the summits)
Southwesterly 25-35mph, some stronger gusts in exposure.
Effect of the wind on you?
Comfort of walking affected, particularly in exposure where conditions will be more strenuous. Feeling cool.
How Wet?
Showers west, more rain later
Frequent showers onto high tops and western slopes facing the Llyn Peninsula and Cardigan Bay; showers tending to merge afternoon. Only odd showers Carneddau and east Wales until later rain.
Cloud on the hills?
Covering high tops and western slopes
Shrouding the high tops with bases as low as 600m on slopes facing Cardigan Bay. More patchy with high bases east Wales. A few afternoon hours may see higher bases.
Chance of cloud free summits?
20%, rising to 40% east
Sunshine and air clarity?
Glimpses of sun east Wales, likely overcast west. Very good visibility.
How Cold? (at 900m)
2C. Feeling like -10C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 4th December 2025
Last updated
Mon 1st Dec 25 at
4:10PM
How windy? (On the summits)
Pre-dawn, southerly 40-45mph. Soon westerly 25-30mph, gradually easing as the day goes.
Effect of the wind on you?
Arduous conditions around dawn with wind chill will soon start to ease, trending towards fairly small effects.
How Wet?
Some showers west
Morning patchy rain passes to the east, giving way to scattered showers off Cardigan Bay. Greatest concentration of showers likely south of Snowdon; substantially dry east and north.
Cloud on the hills?
Improving to banks over high tops
Variable banks of cloud on high terrain, a few lower banks too, tending to clear through morning to just banks over high terrain as showers come and go. An increasing chance of clear summits, particularly east.
Chance of cloud free summits?
Rising to 50%
Sunshine and air clarity?
Glimpses of weak sun through high cloud appearing afternoon. Good visibility though some haze.
How Cold? (at 900m)
1 or 2C. Feeling like -12C early in the day in the wind.
Freezing Level
Just on the high summits at dawn, likely lifting above the summits.
Planning Outlook
Low pressure circulating to the west and north will dominate the weather for the next 7 to 10 days, bringing generally unsettled weather. A brief period of slack pressure on Thursday into Friday will ease winds for a time though patchy rain will linger in several areas. Strong southwesterly winds return over the weekend bringing cloud and rain to many mountains, most persistent on southwestern slopes. Several low pressure systems with continue crossing the British Isles through the week; often showery and cloudy in the west with broader bands of rain regularly passing east. Wind speed likely to vary though often quite strong with risk of gales coming and going. Brighter, drier periods will punctuate the unsettled weather next week but these likely short-lived.