Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
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 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.
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
Monday 16th March 2026
Last updated
Sun 15th Mar 26 at
4:21PM
Summary for all mountain areas
Snow and hail showers affect most areas in the morning, frequent over western hills. A brief easing, then several hours of rain arrives to Wales, moving north and east into England and Scotland through afternoon and into evening. A notable rise in temperature with arrival of rain. Strong wind all day, a slight easing for a few hours.
Headline for Eryri / Snowdonia National Park
Some early snow, then several hours rain; blustery, notably early and late
How windy? (On the summits)
Westerly 35-40mph in the morning, shifting southwesterly and variably lower speeds to 30mph. Strengthening again through later afternoon, tops speeds to 50mph in exposure.
Effect of the wind on you?
Significant wind chill and arduous walking in the morning, improving conditions for several hours but walking remains strenuous in exposure. Significant deterioration in conditions through afternoon.
How Wet?
Some rain and drizzle, widespread for several afternoon hours
A few morning showers, snow above 500m at first, before rain and drizzle spreads east (temporarily as snow higher areas). The rain persistent western mountains, but patchy east Wales. Most rain clears east into evening, drizzle lingers on slopes towards Cardigan bay.
Cloud on the hills?
Variable, mostly high slopes early, significantly deteriorating
Fog likely shrouds high summits all day, variable in the morning, a few breaks towards higher terrain away from showers. Midday into afternoon sees increased cloud over high terrain, filling in widely to 300-400m with time.
Chance of cloud free summits?
30%, lowering to almost nil through afternoon
Sunshine and air clarity?
Glimpses of sun temporarily before cloud thickens: becoming dull and misty.
How Cold? (at 900m)
-1C, rising to 0C morning, further rising towards 4C by evening and perhaps rising another degree into night. Will feel as cold as minus 15C due to wind chill.
Freezing Level
700m morning, slowly rising through morning towards high terrain, then abruptly rising well above the summits afternoon.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 17th March 2026
Last updated
Sun 15th Mar 26 at
4:21PM
How windy? (On the summits)
South-southwesterly 35-45mph, strongest Snowdon to Carneddau with powerful gusts, lower speeds Berwyn group.
Effect of the wind on you?
Considerable wind chill and in near gales; walking sometimes difficult. Balance a struggle in exposure.
How Wet?
Risk drizzle Snowdon-Lleyn peninsula
Drizzly on slopes from Lleyn peninsula to Snowdon. Elsewhere, mostly dry, some spots of drizzle in the wind.
Cloud on the hills?
Risk blanket of fog Snowdon range
Snowdon to Lleyn peninsula: Persistent fog, cloud base 300m, perhaps lower, to 550m. Early cloud elsewhere, but may well mostly or completely break up later morning or middle of day.
Chance of cloud free summits?
10% Snowdon range; otherwise 50%
Sunshine and air clarity?
Snowdon-Lleyn peninsula: Threat dull and murky most or all day. Elsewhere, pockets of sun, perhaps becoming widespread; visibility good although a haze.
How Cold? (at 900m)
3 or 4C. Feeling like -7 to -10C in strongest wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 18th March 2026
Last updated
Sun 15th Mar 26 at
4:21PM
How windy? (On the summits)
Generally southeasterly 5-15mph, some variability, particularly early in the day.
Effect of the wind on you?
Small
How Wet?
Any precipitation unlikely
A small chance of a few odd spots of light rain here and there, but probably entirely dry.
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 9C, staying elevated into night on upper slopes.
Freezing Level
Above the summits.
Planning Outlook
Areas of low cloud, drizzly rain and strong winds will continue to affect mainly western mountains until Wednesday, the rain at times heavy in western Scotland. Pressure begins to quickly rise on Wednesday, providing 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. England, Wales, and southwest Scotland seeing milder temperatures, mostly light wind but the occasional stronger breeze. Elsewhere in Scotland stays cooler, some overnight frosts possible under clear-sky nights. Over the weekend, first indications of a cool easterly wind building across all areas, perhaps some periods of rain south, but further detail currently uncertain.