Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
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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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 18th June 2026
Last updated
Wed 17th Jun 26 at
4:05PM
Summary for all mountain areas
Rain and low cloud affects many mountains, most persistent in the west, patchier and lighter for the Highlands by afternoon. A band of heavier rain for northern England and southwest Scotland, risk some thundery bursts. Blustery southwesterly winds. Feeling humid particularly for England and Wales.
Headline for Eryri / Snowdonia National Park
Windy, up to gale-force. Rain and lowest cloud west.
How windy? (On the summits)
South-southwesterly, soon strengthening from dawn, 25 to 35-40mph, some gusts 50mph for a time western tops, fluctuating during afternoon, but sustained strong winds persist. Rising into night to 40-50mph.
Effect of the wind on you?
Strenuous walking conditions over the hills, gusts making balance challenging in exposure. Marked wind chill.
How Wet?
Rain and drizzle, most in northwest
Generally damp in west, some more persistent steady or heavier rain for periods over western mountains around Snowdon / Yr Wyddfa to Llyn Peninsula. Patchier rain east and southwards, locally often dry.
Cloud on the hills?
Extensive, lowest west
Shrouding the hills throughout the day, from lower slopes up toward west coasts, rarely above 500-600m inland, but some higher breaks Carneddau and Berwyn hills.
Chance of cloud free summits?
Below 10% west, 20% furthest north/east
Sunshine and air clarity?
Largely cloudy, dull. Misty to lower levels near Cardigan Bay, local better visibility below cloud north and east.
How Cold? (at 900m)
10C rising to 12C, locally warmer northeastern areas afternoon, quite humid. Feeling like 0C directly in wind on tops.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 19th June 2026
Last updated
Wed 17th Jun 26 at
4:05PM
How windy? (On the summits)
South-southwesterly, 40 to 50mph all day, peak gusts vary, over 60mph for periods around high tops, may lessen later.
Effect of the wind on you?
Challenging walking, gusts knocking you off balance, including on some downslopes to north. Considerable wind chill.
How Wet?
Risk thundery bursts developing
Early patchy rain in west, or spots from high cloud inland, but several hours likely largely dry. Increasing risk with time of heavy bursts of rain forming, possibly torrential. Risk of thunder.
Cloud on the hills?
Varied, most persistent west coast
Covering many hills from dawn, to lower slopes near Cardigan Bay, here likely to persist. Some rise of base inland and north, some breaks. Filling in and lowering in rain widely, ragged low patches.
Chance of cloud free summits?
20% west, 50% north/east.
Sunshine and air clarity?
Any sun weak through high cloud, mostly north & east; largely overcast west. Visibility may be good for a time inland, but a haze, then murkier around rain.
How Cold? (at 900m)
Humid 12 to 14C, tending to drop later in day, by evening-night to 7C. Feeling near freezing in wind all day.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 20th June 2026
Last updated
Wed 17th Jun 26 at
4:05PM
How windy? (On the summits)
Southwesterly 20mph, easing a little during day.
Effect of the wind on you?
Fairly small, but feeling breezy and rather cool on high tops at least in morning.
How Wet?
Early light showers fade
Drizzly showers mostly west coastal hills early in day, fading to become dry.
Cloud on the hills?
Lowest in west and in morning
Covering western hills fairly widely in morning, to lower slopes toward coast. Bases rising, tending to thin and break, but patches still likely to cap tops in Snowdon group into afternoon, may gradually clear.
Chance of cloud free summits?
20% rising to 70% afternoon
Sunshine and air clarity?
Misty and largely cloudy start, improving with some sun breaking through and visibility becoming very good below cloud.
How Cold? (at 900m)
7C rising to 9 or 10C afternoon. Feeling near to freezing in wind on higher tops in the morning.
Freezing Level
Above the summits.
Planning Outlook
Humid southwesterly winds, gales across many mountains on Friday, plus heavy rain, thundery bursts mixed in. Less windy, but still breezy into Saturday in Scotland, feeling less humid for most, but western Scottish hills at least stay cloud capped and with showery rain. Sunday is a drier day with clearer hills, light winds and feeling warmer. Into next week, a mixed west-southwesterly pattern for Scotland, rain and low cloud most common in the west, drier with higher cloud eastwards and more often dry. Warm and humid for England & Wales - often dry, but possible thunderstorms forming at times - detail more uncertain.