Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday'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.
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.
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.
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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.
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.
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.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 15th March 2026
Last updated
Sat 14th Mar 26 at
12:29PM
Summary for all mountain areas
Widespread rain - snow higher areas Scotland and finishing as snow higher summits elsewhere, will from the west clear (as temperatures drop) to squally hail and snow showers. Upland winds will be close to gale force, and although improving, still extensive low cloud.
Headline for Eryri / Snowdonia National Park
Upland wind near gale; rain, snow and fog.
How windy? (On the summits)
Southwest 50 to occasionally 60mph on higher tops until later morning. Then veering westerly, a slight lull, then 35 to on higher tops 40-45mph - very gusty near precipitation.
Effect of the wind on you?
Continued difficult walking and wind chill significant on exposed higher areas. Expect balance, and in places general mobility to be difficult.
How Wet?
Rain morning; clearing to showers
Morning: Extensive rain, though mostly light easternmost summits. Middle of day: Clearing from west, but the rain finishing as snow above 700m Afternoon: Rain, hail and above 700 snow showers.
Cloud on the hills?
Hills covered morning; then cloud base rising markedly
Morning: Blanket of fog across the hills, breaks to 700m west Wales. Middle of day: Beginning to improve. Into afternoon: Varying cloud base, between 500m near precipitation and mostly 750 to 900m.
Chance of cloud free summits?
Less than 10% morning; later 40%
Sunshine and air clarity?
Dull and misty morning. Then improving to patchy sun (mainly east Wales) and mostly very good visibility (temporarily poor in precipitation).
How Cold? (at 900m)
4C dropping to 0C. Will feel as cold as minus 12C where exposed to the wind.
Freezing Level
Above the summits morning, then dropping erratically to 900m.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 16th March 2026
Last updated
Sat 14th Mar 26 at
12:29PM
How windy? (On the summits)
Westerly; easing from 40-45 to 30-35mph through morning. Strengthening again toward dusk.
Effect of the wind on you?
Significant wind chill and arduous or at times difficult walking. Balance may well be a struggle at least in morning.
How Wet?
Rain & drizzle increasingly widespread.
Possibly dry most of morning but perhaps a few showers, of snow above 450m at first, before rain and drizzle spreads east (temporarily snow higher areas). The rain persistent western mountains, but patchy east Wales.
Cloud on the hills?
May clear to higher slopes temporarily - then considerable deterioration.
Generally fog higher areas all day, in the afternoon widely below 300-400m westernmost slopes to 500-700m east Wales. Perhaps a period later morning when most cloud above 800m (especially east Wales) later morning/middle of day.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of sun temporarily before cloud thickens: becoming dull and misty.
How Cold? (at 900m)
-1C, rising to 0C morning; later 3 or 4C. Will feel as cold as minus 15C due to wind chill.
Freezing Level
750m morning, but rising slowly. Abruptly above the summits later in day.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 17th March 2026
Last updated
Sat 14th Mar 26 at
12:29PM
How windy? (On the summits)
Southerly 30 to 45mph, strongest Snowdon to Carneddau, least wind toward Berwyn Mountains.
Effect of the wind on you?
Considerable wind chill and in near gales; walking sometimes difficult. Balance a struggle.
How Wet?
Risk drizzle Snowdon-Lleyn peninsula
Frequently dry, but risk frequent or constant drizzle Lleyn peninsula to Snowdon.
Cloud on the hills?
Risk blanket of fog Snowdon range
Snowdon to Lleyn peninsula: Persistent fog, cloud base 300m, perhaps lower, to 550m. Elsewhere: Cloud covering the hills widely, 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)
4C.
Freezing Level
Above the summits
Planning Outlook
An abrupt transition will take place on Tuesday and Wednesday. Areas of low cloud, drizzly rain and strong winds will continue to affect mainly western mountains until Wednesday. But then as pressure builds north of Britain it will become extensively fine; cloud often clearing, particularly western Britain, and temperature levels more varied - fairly warm some afternoons but frost widely at night.