Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday's Forecast
Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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.
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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Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
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.
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 11th January 2026
Last updated
Sat 10th Jan 26 at
12:34PM
Summary for all mountain areas
Widely very difficult mountain conditions in severe or storm force upland winds. From west, rapid snow melt commencing and extensive fog - giving whiteout in some areas. Underfoot areas of ice, in some areas on lower slopes.
Headline for Eryri / Snowdonia National Park
Storm force upland wind, rain and fog.
How windy? (On the summits)
Southerly, in range 50 to 60mph much of daytime, at times 70mph high tops morning (and again after dark), when powerful gusts.
Effect of the wind on you?
Challenging conditions with very considerable buffeting particularly in powerful gusts - reaching some lower slopes. Significant wind chill.
How Wet?
Rain often heavy west; rapid thawing
Snow pre dawn. Rain, sometimes heavy through the day Snowdon range; less heavy elsewhere, very little in total east Wales. Increasingly wet underfoot as snow melts.
Cloud on the hills?
Persistent fog
Shrouding the hills all day, to lowest slopes Lleyn peninsula to Snowdon; elsewhere bases typically 600-700m.
Chance of cloud free summits?
Less than 10%
Sunshine and air clarity?
Sunshine not expected; widely dull and misty.
How Cold? (at 900m)
1C at dawn, rising to 5C, small variation of temperature with height in morning. Will feel as cold as minus 13C directly in wind.
Freezing Level
Above the summits, but areas of ice as higher terrain remains partly or largely frozen.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 12th January 2026
Last updated
Sat 10th Jan 26 at
12:34PM
How windy? (On the summits)
Southwesterly 40 to 50mph, strongest Snowdon range.
Effect of the wind on you?
Walking widely difficult on higher areas, frequent buffeting even lower elevations. Significant wind chill.
How Wet?
Rain much of the day, heavy bursts
Frequent to near-constant rain, some heavier showery bursts mixed in, possible hail, chance of isolated thunder in west. Very wet underfoot due to previous rain and snow melt.
Cloud on the hills?
Often covering western tops
Covering higher hills most or all day above 700-800m, at times 500-600m near to the Irish Sea. Some breaks higher up mostly Carneddau and Berwyn to Bala groups.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Rare if any glimpses of sun. A general haze, visibility poor in rain.
How Cold? (at 900m)
3 or 4C. Wind chill feeling around -10C where directly exposed on tops.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 13th January 2026
Last updated
Sat 10th Jan 26 at
12:34PM
How windy? (On the summits)
Low confidence in forecast: Generally southerly 30 to perhaps 40mph, although speeds may be lower or drop from west.
Effect of the wind on you?
Walking on higher areas may well be arduous most or all day and wind chill considerable.
How Wet?
Rain may become incessant
Rain may well fall most or all day - although drier conditions to the west may penetrate across Wales (very uncertain).
Cloud on the hills?
Blanket of low cloud probable; cloud base may rise or have risen from west
Cloud may well fill in or have filled in across the hills in rain. There may be improvement from the west but this very uncertain.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Little or no sunshine. Widely misty or murky in rain.
How Cold? (at 900m)
4C
Freezing Level
Above the summits.
Planning Outlook
High rainfall and intermittently windy across most mountains areas next week as a series of Atlantic lows cross Britain. From Tuesday day to day confidence very low due to uncertainty in timing and tracking of lows. Over England and Wales, temperatures on higher summits will intermittently be below freezing point: snow may accumulate on highest summits. Freeze thaw cycles will occur on the Scottish Highlands, although above 900m periods of thaw may well be brief, with progressive enhancement of the snowpack likely.