Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday'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.
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.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra 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.
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.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 12th September 2026
Last updated
Fri 11th Sep 26 at
4:29PM
Summary for all mountain areas
Severe gales from dawn on Scottish mountains ease during morning, moderate speeds by mid-afternoon, whilst gales continue on tops in England & Wales until later. An intense band of rain moves south, followed by still frequent rain, some showery bursts plus low cloud western hills. Drier later north Scotland.
Headline for Eryri / Snowdonia National Park
Gales on tops most of day. Rain sets in heavy.
How windy? (On the summits)
Southwesterly, rising through dawn to 50mph, soon up to 60mph higher northern tops, lessening gradually afternoon to 40mph, then 30mph into evening.
Effect of the wind on you?
Very difficult walking conditions with powerful gusts to low levels until later in daytime, on exposed terrain you may be blown over. Considerable wind chill.
How Wet?
Heavy rain develops, sets in, lasts until late in day
Rain initially patchy, but soon more persistent northwestern Eryri in the morning, then more widely, heavier falls developing, setting in continuously through middle of day and afternoon, only fading from north during evening. Increasingly very wet underfoot, streams rising to be in spate later.
Cloud on the hills?
Increasingly extensive, lowest west
Banks of low cloud over hills toward the west in the morning, some early breaks more north and eastern groups. Filling in and lowering widely in rain, to mid-slopes in west, highest bases remain further east.
Chance of cloud free summits?
20% becoming almost nil west
Sunshine and air clarity?
Overcast, increasingly dull. Hazy, then widely poor visibility in rain.
How Cold? (at 900m)
10C rising to 12C, quite humid. Feeling like -2 to -5C directly in wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 13th September 2026
Last updated
Fri 11th Sep 26 at
4:29PM
How windy? (On the summits)
West-northwest 20-25mph at dawn, easing during morning, to 10mph by middle of day, later SW'ly. Rising again by evening.
Effect of the wind on you?
Feeling chilly in a fresh breeze early morning, becoming small most of day.
How Wet?
Soon substantially dry
A little light rain or drizzle on northwest hills nearer the coast at first, but likely to fade.
Cloud on the hills?
Low cloud in morning lifts and breaks
Cloud banks fairly extensive from dawn into morning, varied to some lower slopes in western areas; highest tops may be near top of the cloud layer for a time. Tending to thin and lift, to leave odd patches on high tops afternoon.
Chance of cloud free summits?
30% rising to 80%
Sunshine and air clarity?
Variable sunshine and cloud, sunnier near coast afternoon. Visibility soon excellent.
How Cold? (at 900m)
7C rising to 10C during day, may rise a degree or so more into evening and night. Feeling near freezing in early wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 14th September 2026
Last updated
Fri 11th Sep 26 at
4:29PM
How windy? (On the summits)
Southwesterly 30-40mph likely rising to 50mph, some notable strong gusts high passes and some downslopes.
Effect of the wind on you?
Frequent buffeting over the hills, very gusty in places affecting stability, not just highest terrain. Marked chill factor despite mild air.
How Wet?
Rain and drizzle, risk heavier bursts
Drizzle and light rain in the west from dawn, becoming steady rain over western hills much of the day, occasional heavier falls, more constant with time. Possibly an isolated thundery burst forming.
Cloud on the hills?
Extensive very low cloud
Blanket cloud shrouding the hills, from lower slopes upward toward Cardigan Bay, extensive above 400-500m even well inland, but some higher breaks locally north Carneddau to Bala/Berwyn groups.
Chance of cloud free summits?
Below 10%
Sunshine and air clarity?
Overcast and dull, misty or murky to lower slopes in west, local brighter areas north and easternmost areas.
How Cold? (at 900m)
14C, humid, little change all day, then starting to lower into night. Feeling like 0 to 3C directly in the wind.
Freezing Level
Above the summits.
Planning Outlook
Staying unsettled with Atlantic lows dominating to the north; often windy, gale-force westerly winds for periods over higher terrain. Better weather this Sunday, then wind and rain returns into Monday, staying showery into Tuesday. A mixed outlook continues later next week with rain most frequent in western Scotland. Temperatures varying, some cooler days especially in Scotland, but often fairly mild further south, at times quite warm and humid. Higher pressure and better weather tends to expand further north later in month.