Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday's Forecast
Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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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Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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 17th March 2026
Last updated
Mon 16th Mar 26 at
3:15PM
Summary for all mountain areas
Widely windy, severe gales in Scotland. Rain in the western Scottish highlands edges into central highlands with time; early drizzle over many high slopes, lingering in Scotland, Lakeland, and Snowdonia. Sun breaking out afternoon over Wales and the Pennines with milder temperatures, though a chill in wind.
Headline for Eryri / Snowdonia National Park
Gales, easing somewhat; early fog, breaking east and north
How windy? (On the summits)
South-southwesterly 45-55mph, strongest Snowdon to Carneddau with powerful gusts. Lower speeds Berwyn group, nearer 40mph, and with time, more widely easing to 30-40mph, then easing further overnight.
Effect of the wind on you?
Mobility difficult much of the day in northwest Snowdonia NP with buffeting gusts a constant challenge to balance. Strenuous in the Berwyn group, with a slow improvement in conditions.
How Wet?
Morning drizzle
Drizzly over most high terrain in the morning, down to the middle slopes of Snowdonia NP towards the Llyn Peninsula. Drizzle easing through the morning to just affect the highest summits, later dry.
Cloud on the hills?
Early blanket fog, improving, best north and east
Extensive fog from dawn, 400-500m upward. Fog soon lifts and clears south and east of Snowdonia NP, western slopes and those near Llyn Peninsula slow to improve, cloud lingering from 600m upward here. Berwyn and Carneddau groups best chance of summit breaks, occasional banks return too.
Chance of cloud free summits?
20% west Snowdon range, to 50% east Wales
Sunshine and air clarity?
Overcast and dull at dawn, cloud breaking for sunny periods, perhaps extensive north and east where visibility good, though some haze. May stay cloudier west Snowdonia NP.
How Cold? (at 900m)
3 or 4C. A slight rise of temperature overnight. Feeling like -6 to -8C in direct wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 18th March 2026
Last updated
Mon 16th Mar 26 at
3:15PM
How windy? (On the summits)
South-to-southeasterly 5-15mph, some variability, particularly early in the day.
Effect of the wind on you?
Small.
How Wet?
No precipitation expected
Cloud on the hills?
Most hills clearing through morning
Some cloud banks on high terrain early in the day, a few patches on sheltered lower slopes too. After sunrise, cloud lifts upslope, likely clearing most or all hills for much of the day.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Mostly sunny. Very good visibility.
How Cold? (at 900m)
6C from dawn, little change in temperature with height; lifting to 10C, staying elevated into night on upper slopes.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 19th March 2026
Last updated
Mon 16th Mar 26 at
3:15PM
How windy? (On the summits)
Easterly 10mph, at times directed more southeasterly. Some light gustiness.
Effect of the wind on you?
Negligible.
How Wet?
No precipitation expected
Cloud on the hills?
Early valley fog dissipates for clear hills
Patches of fog in sheltered valleys in the morning, most common in east and mid-Wales. Fog begins to lift upslope after sunrise, soon dissipating for cloud-free hills.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Extensive sunshine, high cloud to the north later in the day. Good visibility but hazy.
How Cold? (at 900m)
10 or 11C.
Freezing Level
Above the summits.
Planning Outlook
Pressure begins to rise on Wednesday, bringing fairly widely settled conditions across the country. Some cloud and spotty light rain lingers in north England/south Scotland for a few days, elsewhere becoming mostly sunny; valley fog in many lowland areas early, lifting and dissipating after sunrise for clear hills. Generally milder temperatures and light wind but the occasional stronger gust. East Scotland stays cooler for a time, some overnight frosts possible under clear-sky nights. Over the weekend, first indications of a cool easterly wind building, perhaps some patchy rain here and there. Into next week, detail is uncertain; low pressure may occasionally unsettle the weather, brining cooler, wetter, and windier periods.