Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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
Monday 1st June 2026
Last updated
Sun 31st May 26 at
4:00PM
Summary for all mountain areas
Rain affects all areas during the day, some heavy falls widely, most constant in Wales. Low cloud across the hills, blanketing to lower slopes in west coastal areas. South-southwest winds, varied in Scotland, but stronger England and particularly Wales, here gales over tops. Fairly mild air, but feeling cooler in wind.
Headline for Eryri / Snowdonia National Park
Windy, increasingly gales. Prolonged heavy rain; low cloud.
How windy? (On the summits)
Southwesterly 30 to 40mph, strong gusts, generally rising speeds through morning, to 40-45mph, gusts 50mph high tops afternoon, possibly briefly stronger late afternoon, then tending to drop later evening into night.
Effect of the wind on you?
Challenging walking conditions all day, buffeting gusts affecting balance, generally difficult during afternoon on high terrain. Considerable wind chill.
How Wet?
Constant rain sets in heavy
Patchy rain from before dawn soon becomes frequent, setting in persistently with extended falls widely across Eryri NP. May ease somewhat north and east later in the day, but any dry windows very short. Becoming wet underfoot, streams rising rapidly, later in spate in west.
Cloud on the hills?
Extensive, lowest west coasts
From dawn, a deck of cloud shrouds western slopes from 400-500m up, locally lower; some higher breaks near Carneddau to start, locally to summits, but cloud fills in above 500-600m nearly all hills, or to lower slopes west coast.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast and largely dull, local brighter moments in morning northeast. Visibility poor due to low cloud, but good at low heights in north/east.
How Cold? (at 900m)
9 or 10C; may rise a degree during day. Feeling below freezing in strongest wind, near -5C higher tops.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 2nd June 2026
Last updated
Sun 31st May 26 at
4:00PM
How windy? (On the summits)
Westerly 20 to 25mph, occasional 30mph at least in gusts on tops.
Effect of the wind on you?
Noticeable breeze, at times starting to affect balance on exposed ridges.
How Wet?
Heavy thundery showers, may fade
Showery rain on and off from dawn, some heavier bursts forming and passing eastwards morning into middle of day, risk isolated thunder. Fading for a time in west afternoon, some light showers later.
Cloud on the hills?
Lifting toward tops, breaks form
Cloud banks covering higher slopes most widely in west in morning, becoming confined above 800m and higher breaks into middle of day onward. Patches likely return over western tops into evening.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Glimpses of sun, may become sunnier near west coast for a time afternoon. Visibility very good, reduced in showers.
How Cold? (at 900m)
8 or 9C. Feeling close to 0C if exposed to wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 3rd June 2026
Last updated
Sun 31st May 26 at
4:00PM
How windy? (On the summits)
South-southwesterly 35 to 50mph, risk 60mph at least in gusts on higher tops.
Effect of the wind on you?
Strenuous to often arduous walking in exposure, buffeting gusts knocking you off balance. Considerable wind chill.
How Wet?
Rain and drizzle persistent
Rain extends in from the west, becoming fairly persistent, heavy at times especially western hills, drizzly even when heavier rain fades; occasionally easing off northeast areas.
Cloud on the hills?
Extensive
Blanket low cloud across the hills, from lower slopes up near the coast, rarely above 500-600m inland, highest bases toward northeast of Ogwen valley.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Largely cloudy, dull, murky toward west in rain; hazy at best. Better visibility eastern hills below cloud.
How Cold? (at 900m)
7C, slight rise if not in cloud. Wind chill feeling like -5 to -8C.
Freezing Level
Above the summits.
Planning Outlook
An unsettled spell through early June, possibly through the first two weeks, as low pressure over the north Atlantic and southwesterly winds dominate. Periods of rain mixed with showery days widely - the most constant rain over western mountains with low cloud often shrouding the hills. Wind speed will vary, but up to gale-force for periods over the hills, mostly in Scotland by later this week. Higher pressure to the south tends to expand across and just east of Britain later in the week, bringing some drier weather, but western hills even in England and Wales may remain often misty and drizzly. Temperatures near average, cooler at times. Mid June onward shows signs of drier and warmer weather.