Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday'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
Tuesday 16th June 2026
Last updated
Mon 15th Jun 26 at
4:28PM
Summary for all mountain areas
Damp southerly air will cloak many hills in low cloud, plus drizzle or a little rain. Highest cloud bases and best chance for breaks further northward. Moderate winds, more blustery near west coasts, strengthening for Wales where frequent rain arriving.
Headline for Eryri / Snowdonia National Park
Breezy, increasingly windy. Low cloud, rain mainly afternoon.
How windy? (On the summits)
South-southwesterly 15-20mph from dawn into morning, strengthening to 30mph midday onward, some stronger gusts high tops, in places 40mph later.
Effect of the wind on you?
Fairly small at dawn, becoming more blustery, affecting comfortable walking on high terrain, gusts making balance more challenging on some exposed ridges. Marked wind chill despite mild air.
How Wet?
Patchy rain develops into afternoon
Largely dry morning, some patchy light rain drifts from the southwest. Rain increasingly frequent afternoon, more persistent western hills, some heavier pulses of rain occasionally. Risk more constant rain later evening, mainly southern areas.
Cloud on the hills?
Fairly extensive, some breaks north and east
High terrain shrouded from dawn, likely 500-600m upward; some morning periods of higher bases, any breaks to summits brief, best chance over Carneddau and near Bala to Berwyn groups. Then more extensively shrouded from the west in afternoon, from 400m up near west coast, higher bases north of the A5.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Mostly overcast, rare glimpses of weak sun mainly north and eastern areas. Very good visibility below cloud, deteriorating later in rain.
How Cold? (at 900m)
10 or 11C. Feeling near freezing in strongest wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 17th June 2026
Last updated
Mon 15th Jun 26 at
4:28PM
How windy? (On the summits)
Southwesterly 25 to 35mph, 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, starting to affect balance on some ridges.
How Wet?
Rain and drizzle, fading
A mix of rain, drizzle and some showery moments; the most frequent rain typically western hills, risk persistently wet over several hours. Tending to fade through afternoon.
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
Mon 15th Jun 26 at
4:28PM
How windy? (On the summits)
South-southwesterly, tending to strengthen possibly soon, 25mph to 35-40mph, risk reaching 50mph later at least in gusts.
Effect of the wind on you?
Expect strenuous walking conditions over the hills, gusts making balance increasingly challenging in exposure.
How Wet?
Rain and drizzle much of day
Generally damp at best, risk some more persistent steady or heavier rain over western mountains. Patchier rain eastwards.
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 near 0C directly in wind on tops.
Freezing Level
Above the summits.
Planning Outlook
Humid southwesterly winds continue to prevail later this week, likely reaching gale-force over hills for a period Thursday into Friday, soonest in Wales. Periods of rain, some heavy, mixed with drizzle and low cloud most persistent in the west. More uncertainty of day-to-day detail in the extended range, but in general a variable southwesterly pattern continues; rain and low cloud common in western Scotland into next week. Some warmer days, drier more often England and Wales.