Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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
Wednesday 17th June 2026
Last updated
Tue 16th Jun 26 at
4:30PM
Summary for all mountain areas
Southwesterly winds will be fresh to strong over the mountains. Rain widely fairly persistent in the morning, more showery for Scotland into afternoon, fading for northern England and Wales, but patchy rain lingers in south Wales. Cloud shrouding most high terrain, lowest in west, some breaks afternoon.
Headline for Eryri / Snowdonia National Park
Strong breeze. Early rain and low cloud clearing.
How windy? (On the summits)
Southwesterly 25 to 30mph, nearer 35mph for a few hours from dawn; gusty around higher tops, some passes, also downslopes to the northeast.
Effect of the wind on you?
Blustery over the hills, strenuous walking in exposure on higher slopes, particularly early morning, starting to affect balance on some ridges.
How Wet?
Rain and drizzle, fading
A mix of rain, drizzle and some showery moments in morning; the most frequent rain typically western hills, risk persistently wet over several hours. Tending to fade through afternoon to be more often dry.
Cloud on the hills?
Extensive, some improvement afternoon
Blanket cloud across the hills around rain, from lower slopes upward toward Cardigan Bay and Llyn Peninsula, here may persist over tops all day. Lifting to 600m near & northeast of the A5, some breaks form higher in afternoon.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Largely cloudy, some sun may break through afternoon mainly north/east. Hazy much of day near west coast, misty widely around rain, then visibility improves afternoon, to be very good well inland.
How Cold? (at 900m)
10C, little change all day. Feeling near to freezing directly in wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 18th June 2026
Last updated
Tue 16th Jun 26 at
4:30PM
How windy? (On the summits)
South-southwesterly, soon strengthening from dawn, 25 to 35-40mph, risk gusts 50mph for a time western tops.
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 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?
10%
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. 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
Tue 16th Jun 26 at
4:30PM
How windy? (On the summits)
South-southwesterly, 40 to 50mph all day, peak gusts may vary, over 60mph for periods around high tops.
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 possible 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
May cover 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 during day, by evening to 7C. Feeling near freezing in wind all day.
Freezing Level
Above the summits.
Planning Outlook
Humid southwesterly winds persist late this week, reaching gale-force over hills - affecting northern England and Wales on Thursday, then Scotland by Friday. Periods of rain, some heavy falls with possible thundery bursts mixed in. Low cloud most persistent in the west. 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 more uncertain, but a risk of some further rain pushing in from the southwest - warmer again over England and Wales. A mixed west-southwesterly pattern into next week, rain and low cloud most common in western Scotland, drier with higher cloud eastwards and more often dry for England & Wales. Near average temperatures, may rise late week in south.