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.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Terrain widely frozen
All ground frozen from lower elevations upward, with hard frost or snow cover. Beware of icy surfaces on lower and higher terrain. Appropriate footwear needed, crampons may be 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.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Terrain widely frozen
All ground frozen from lower elevations upward, with hard frost or snow cover. Beware of icy surfaces on lower and higher terrain. Appropriate footwear needed, crampons may be necessary.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 5th January 2026
Last updated
Sun 4th Jan 26 at
4:15PM
Summary for all mountain areas
Cold northerlies continue; significant chill factor over mountains, though speeds less than recent days. All terrain frozen; snow cover widely in Highlands, substantial in north, further showers of snow and hail. Showers continue to feed into N/W Wales. Largely dry with sun and broken cloud N England/S Scotland.
Headline for Eryri / Snowdonia National Park
Cold brisk wind. Snow showers mostly toward Llyn peninsula.
How windy? (On the summits)
Northerly 25-30mph, squally gusts in showers; easing a little afternoon. Then into evening shifting northwesterly, tending to increase again slightly with time.
Effect of the wind on you?
Continued significant wind chill over the hills. Starting to affect comfortable walking, some buffeting gusts in places over tops.
How Wet?
Snow and hail showers, mostly west
Overnight snow showers may leave a fresh covering widely to lower slopes. Irish Sea showers come and go onto Snowdon and mountains to the west, occasionally north of A5 too. Fewer showers, if any, reaching Berwyn to Bala groups.
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. Wind chill feeling like -17C in exposure on high tops.
Freezing Level
Terrain widely frozen down to valleys well inland; locally at dawn near -10C some valleys toward mid-Wales. Lifting just above freezing to 300-400m near coast.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 6th January 2026
Last updated
Sun 4th Jan 26 at
4:15PM
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.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 7th January 2026
Last updated
Sun 4th Jan 26 at
4:15PM
How windy? (On the summits)
Northwesterly 25 to 35mph, likely strongest around dawn, lessening, shifting westerly, 10-20mph, then increasing after dark.
Effect of the wind on you?
Be prepared for marked wind chill on exposed high terrain, risk very blustery at first, becoming smaller during daytime.
How Wet?
Patchy hill snow, then sleety rain
Local showers feeding inland from coasts in morning, falling as snow on hills, may blend into some steadier precipitation from west, turning to sleet/rain to mid heights or above; less precipitation in eastern areas.
Cloud on the hills?
Varied over higher slopes
Cloud banks likely to come and go over higher tops, may often cling around some slopes, mostly western areas, but some breaks to tops inland and east Wales during the daytime.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Some early brightness through high cloud, mainly east, but overcast skies becoming duller. Visibility very good whilst dry.
How Cold? (at 900m)
-2C rising to +1C, or slightly higher after dark. Feeling around -10C if exposed to stronger wind.
Freezing Level
Slight frost inland valleys at first. Otherwise 600m, tending to rise above freezing to higher slopes, but icy surfaces likely.
Planning Outlook
Freezing conditions widely over the mountains all this week - some changes toward the weekend as Atlantic lows try to circulate further northwards, bringing some variable thawing mainly to England and particularly Wales, whilst Scottish mountains may see brief if any periods of above-freezing conditions even onward into mid-month. Complex weather systems later this week, with potentially a deep low moving across southern Britain by Thursday-early Friday which may bring some snowfalls to Wales and the southern Pennines, accompanied by possibly severe gales. More variable wind speeds for Scotland, trending westerly; some lulls but interspersed with gales. Further accumulating upland snow, mixed with some lowland rain.