Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday'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.
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.
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.
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 4th December 2025
Last updated
Wed 3rd Dec 25 at
4:25PM
Summary for all mountain areas
A complex weather situation with areas of frequent or persistent rain and hill snow, focused from the southern Highlands to northern England; often strong SE'ly winds. Further north in the Highlands, generally drier with higher cloud breaks. In Wales, becoming showery westerlies with risk of hail.
Headline for Eryri / Snowdonia National Park
Early rain/snow on tops, then squally showers, cloud rising.
How windy? (On the summits)
Pre-dawn, southerly 40-45mph, but by dawn a possible brief lull. Then soon mostly westerly 25-30mph, sudden squalls in showers.
Effect of the wind on you?
Expect variations, but soon frequently feeling blustery over hills with considerable wind chill. Gusty spells will challenge balance in exposure.
How Wet?
Rain and upland snow, then showers
Morning patchy rain passes to the east - some uncertainty - low risk persistent rain, snow above 800m, lingering for several hours. Giving way to scattered showers off Cardigan Bay. Greatest concentration of showers likely south of Snowdon, possible hail.
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?
20% rising to 50% afternoon inland
Sunshine and air clarity?
Glimpses of weak sun through high cloud appearing afternoon. Good visibility though some haze.
How Cold? (at 900m)
0C Feeling like -10C in exposure to stronger winds on tops during day.
Freezing Level
900m
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 5th December 2025
Last updated
Wed 3rd Dec 25 at
4:25PM
How windy? (On the summits)
Southerly 30-35mph, rising to 50mph afternoon with gusts over tops up to 60mph+. Easing overnight.
Effect of the wind on you?
Strenuous walking early deteriorates to widely challenging conditions with powerful gusts. Severe wind chill in exposure.
How Wet?
Rain sets in widely from midday
Patchy showery rain/sleet drifts inland from Cardigan Bay early. Rain sets in widely around the midday hours with heavy falls into nighttime.
Cloud on the hills?
Becoming extensive
From dawn cloud likely caps the high tops with banks down towards 700m on western slopes. Many eastern hills clear. Soon lowering widely towards 600-700m as rain arrives, as low as 400m westernmost slopes.
Chance of cloud free summits?
Soon lowering to less than 10%
Sunshine and air clarity?
Overcast. Visibility becomes poor as rain sets in.
How Cold? (at 900m)
1 or 2C, rapidly rising afternoon to 4 or 5C, remaining warmer into night. Feeling like -12C in strong wind.
Freezing Level
700-800m, rising above the summits through morning.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 6th December 2025
Last updated
Wed 3rd Dec 25 at
4:25PM
How windy? (On the summits)
Southwesterly 35 to 45mph, risk strengthening over 50mph high tops.
Effect of the wind on you?
Challenging walking conditions, frequent buffeting affecting balance on exposed tops and ridges; marked wind chill.
How Wet?
Frequent showery rain
Rain on and off most or all day, a mix of drizzle where in cloud and some steadier rain, but heavier showery bursts at times, particularly western hills, possible hail.
Cloud on the hills?
Fairly extensive tops
Often covering higher slopes, bases varied in and out of rain, mostly 600 to 800m. More frequent to mid-slopes near Cardigan Bay for periods. Higher breaks more common Bala to Berwyn hills.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of sun mostly east. Visibility varied, poor in rain, intermittently good out of cloud.
How Cold? (at 900m)
4C. Wind chill feeling like -7 to -10C.
Freezing Level
Above the summits.
Planning Outlook
Generally unsettled through the weekend and into next week with areas of low pressure circulating near to the British Isles. Temperatures often near to freezing point on higher Scottish mountains, at times on tops elsewhere, though some thawing will occur periodically even to high tops in the Highlands. A complex series of frontal systems bringing spells of rain and some upland snow, mixed with showers with hail mostly near western coasts. Wind speeds will also vary, often south to southwesterlies, at times reaching gale force on tops, but intermittent lulls.