Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today'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 hail showers
Periods of bright or sunny conditions mixed with showers or flurries of snow and hail. Visibility may change rapidly from excellent to very poor.
Very cold
Significant wintry conditions - below freezing from lower elevations up all day, -7 or -8C highest summits, feeling like -20C or below on high tops due to wind chill. Frostbite and hypothermia risk. Substantial protective clothing is required.
Winter kit required on higher terrain
Snow cover over higher mountains. Safe progress over some terrain will require suitable footwear - possibly crampons and ice-axe where necessary.
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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 hail showers
Periods of bright or sunny conditions mixed with showers or flurries of snow and hail. Visibility may change rapidly from excellent to very poor.
Very cold
Significant wintry conditions - below freezing from lower elevations up all day, -7 or -8C highest summits, feeling like -20C or below on high tops due to wind chill. Frostbite and hypothermia risk. Substantial protective clothing is required.
Winter kit required on higher terrain
Snow cover over higher mountains. Safe progress over some terrain will require suitable footwear - possibly crampons and ice-axe where necessary.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 4th January 2026
Last updated
Sat 3rd Jan 26 at
3:29PM
Summary for all mountain areas
Snow, hail, and wind continues driving into northern Scotland with showers passing into central and western areas; snow coverage fairly widespread in the Highlands. Southern Scotland and England mostly sunny, blustery in exposure. More snow and hail showers for Wales, pushing further east afternoon. Widely very cold.
Headline for Eryri / Snowdonia National Park
Snow and hail showers increasingly widespread; very cold
How windy? (On the summits)
Northwesterly mostly 20-25mph, squally gusts in showers, speeds at times reaching towards 30mph or higher in exposure.
Effect of the wind on you?
Significant wind chill over the hills, severe highest tops. Ease of walking affected with some buffeting, may become more strenuous in exposure for periods.
How Wet?
Snow and hail showers increasingly widespread
Irish Sea showers move onto western slopes in the morning, falling more widely across north Wales with time.
Cloud on the hills?
Increasingly shrouding high terrain
Capping higher tops from Carneddau to Snowdon group, base varied above 700-800m, a few higher breaks early. Bases lower in showers, and bases to middle slopes increasingly widely across Snowdonia NP.
Chance of cloud free summits?
50% lowering to 20%
Sunshine and air clarity?
Often cloudy, bursts of sunshine though becoming less frequent with time. Visibility excellent where dry, but increasingly very poor in snow and cloud.
How Cold? (at 900m)
-4C, cooling a degree overnight. Wind chill feeling like -17C in exposure on high tops.
Freezing Level
Terrain widely frozen down to valleys well inland; up to 300m northwest of Snowdon, rising to this level on slopes exposed to sunlight too.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 5th January 2026
Last updated
Sat 3rd Jan 26 at
3:29PM
How windy? (On the summits)
Northerly 20-30mph.
Effect of the wind on you?
Continued significant wind chill over the hills, severe highest tops where walking becomes strenuous with buffeting.
How Wet?
Snow showers, mostly west
Irish Sea showers come and go onto Snowdon and mountains to the west, occasionally north of A5 too. Fewer showers, if any, reaching Berwyn group.
Cloud on the hills?
Variable, most extensive northern high ground
Often capping higher tops from Carneddau to Snowdon group, base varied above 800-900m, a few higher breaks but also lowering in showers. Towards Berwyn group, any cloud fleeting on high tops, if any.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Bursts of sunshine, most frequent to the south and east. Visibility excellent where dry, but very poor in snow and cloud.
How Cold? (at 900m)
-4 or -5C. Well inland valleys similarly cold at dawn. Wind chill feeling like -17C in exposure on high tops.
Freezing Level
Terrain widely frozen down to valleys well inland; up to 200m near coastal slopes, highest towards the north.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 6th January 2026
Last updated
Sat 3rd Jan 26 at
3:29PM
How windy? (On the summits)
Soon westerly 10-15mph, strengthening with time and shifting southwesterly, 30-35mph over the summits.
Effect of the wind on you?
Fairly small for several hours, though walking becoming uncomfortable to strenuous with significant wind chill.
How Wet?
Pulses of patchy snow
Bands of patchy snow passing west-to-east through the day. Increasingly mixed with rain to low slopes near the coast. Snow/sleet becomes more frequent from afternoon into night.
Cloud on the hills?
High tops shrouded, variably lower in snow
The high tops of Snowdonia NP likely remain in cloud all day, bases lowering during snow, locally to middle slopes. The cloud increasingly present to middle slopes with variable lower bases with time.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Some bright/sunny spells will break out, but cloud will be extensive for periods too. Variable visibility, very good for periods, but rapidly deteriorating to very poor in snow.
How Cold? (at 900m)
-2C or -3C, rising slightly with time. Feeling as cold as -15C in strongest wind.
Freezing Level
Frosts inland valleys, nearer 200-300m western mountains from dawn. Lifting with time to 400-600m, highest level west.
Planning Outlook
Monday stays cold with terrain widely frozen; sunshine inland with continued snow showers along coasts. The weather then turns more variable: fronts begin to approach the country on Tuesday, with cloud gradually becoming widespread on high terrain from the north, an area of snow arriving widely into Scotland and tracking south into England and Wales overnight into Wednesday. Most terrain will stay frozen but a brief local lifting of freezing levels in western areas. Some sunny breaks and snow showers will follow this system. Beyond Wednesday, confidence in forecast detail is significantly lower, but another weather system is indicated for Thursday into Friday, this possibly bringing a swathe of snow, rain, and strong winds to the south and perhaps more widely.