Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
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.
Chilly
Air temperature near or just above freezing on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
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.
Chilly
Air temperature near or just above freezing on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 25th March 2025
Last updated
Mon 24th Mar 25 at
3:40PM
Summary for all mountain areas
Fine weather for Scotland, sunshine best toward the south and east, chance of a brief shower northwest. Chilly breezes over higher terrain. A front clearing southwards over England & Wales brings a little rain and cloud covering the hills, but improving from the north.
Headline for Eryri / Snowdonia National Park
Breezy on tops. Starting dull and damp, improving, sunnier later.
How windy? (On the summits)
Northwesterly 20 to 25mph, occasional 30mph around highest tops.
Effect of the wind on you?
Feeling blustery and chilly around higher tops, starting to affect balance on exposed ridges.
How Wet?
A little rain at first
Patchy rain and drizzle from before dawn into the early morning, persistent for an hour or so, fading and clearing southwards to be dry by mid-late morning.
Cloud on the hills?
Covering hills for a few hours, breaking
Shrouding the hills above 400 to 600m from dawn, lowest near coast. Lifting to upper slopes during morning, then increasingly breaking to tops in afternoon.
Chance of cloud free summits?
10% rising to 80% afternoon
Sunshine and air clarity?
Cloudy morning, sun breaking through in afternoon, later increasingly sunny. Visibility reduced in rain, murky start, becoming very good.
How Cold? (at 900m)
3 to 5C. Wind chill feeling like -3 to -5C.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 26th March 2025
Last updated
Mon 24th Mar 25 at
3:40PM
How windy? (On the summits)
South to southwesterly, strengthening 15 to 25mph.
Effect of the wind on you?
Fairly small, but becoming increasingly blustery on higher exposed areas.
How Wet?
Rain not expected
Cloud on the hills?
Occasional patches
Mist patches some valleys and lower hill slopes at first, mostly dispersing, but some patches may drift over higher slopes for periods in west; mostly lifting above tops.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Some sun through thin high cloud. Visibility very good.
How Cold? (at 900m)
4 to 6C.
Freezing Level
Above the summits; possible slight frost some valleys at dawn.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 27th March 2025
Last updated
Mon 24th Mar 25 at
3:40PM
How windy? (On the summits)
Southwesterly 25 to 35mph, gusty over higher tops and some elevated passes.
Effect of the wind on you?
Blustery, strenuous walking on higher exposed terrain. Marked wind chill.
How Wet?
Rain or drizzle much of the day
Rain fairly persistent for several hours at least, but patchy rain or drizzle likely on and off all day, generally damp where in cloud; may fade later.
Cloud on the hills?
Extensive
Blanket low cloud much of the day, shrouding hills to lower elevations in west coastal areas, widely 400-500m inland. Higher bases and local breaks possible north/east of Ogwen valley.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Sunshine unlikely. Misty, murky western areas; better visibility further east.
How Cold? (at 900m)
5C. Wind chill feeling like -5 to -8C.
Freezing Level
Above the summits
Planning Outlook
Westerly winds prevailing from midweek through to the weekend - often gale force over the mountains, particularly Scotland. Spells of rain, most persistent in western Scotland. Temperatures near or just above freezing on Scottish tops midweek, then widely chillier by Friday into the weekend - sub-zero on all hills above 800m, with showers of snow on hills and sometimes hail. An improving trend by Sunday into early next week high pressure starts to rebuild, bringing dry weather and lighter winds for most places.