Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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.
Dry and sunny
Extensive strong warm sunshine. The mountains free of cloud once any early mist patches disperse.
Clear
Excellent or superb visibility, no navigation issues.
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.
Bright sunshine
Beware of sunburn from bright spring sunshine, despite feeling cool in the breeze on higher terrain.
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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.
Dry and sunny
Extensive strong warm sunshine. The mountains free of cloud once any early mist patches disperse.
Clear
Excellent or superb visibility, no navigation issues.
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.
Bright sunshine
Beware of sunburn from bright spring sunshine, despite feeling cool in the breeze on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 7th May 2025
Last updated
Tue 6th May 25 at
4:00PM
Summary for all mountain areas
Fine with sunshine and patchy fair-weather cloud above the hills, may cover the sky for periods by the afternoon. Remote risk of an isolated shower forming. Mostly light winds, a freshening northeasterly for the Pennines later. Cool start, becoming pleasantly warm.
Headline for Eryri / Snowdonia National Park
Sunshine, patchy cloud; breeze increasing later.
How windy? (On the summits)
North to northeasterly 10-15mph, strongest toward Llyn, at times 20mph; more widely strengthening into evening, local gusts 25mph around high tops.
Effect of the wind on you?
Fairly small, but feeling chilly in the stronger breeze early and especially late in the day.
How Wet?
No rain
Cloud on the hills?
Not expected
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Sun and high cloud, some patchy fair-weather cloud building afternoon inland; sunniest near to west coasts. Visibility excellent.
How Cold? (at 900m)
4C at dawn, rising as high as 9C afternoon, but in the breeze feeling much cooler - just below freezing at first, around 3C later in day.
Freezing Level
Generally above the summits, but at dawn near freezing with slight frost both in the valleys and on sheltered higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 8th May 2025
Last updated
Tue 6th May 25 at
4:00PM
How windy? (On the summits)
Easterly 20mph, in places gusty 25mph some high tops, also some elevated passes in the morning.
Effect of the wind on you?
Fairly small, but feeling chilly on exposed high terrain, especially morning. May at times start to affect balance on ridges.
How Wet?
Rain not expected
Cloud on the hills?
Soon lifting and clearing
Patches of cloud may graze tops mainly Carneddau area early morning, soon all lifting above the summits.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Sunniest near west coast, some broken cloud for periods inland. Visibility excellent.
How Cold? (at 900m)
3C rising to 8C afternoon. Feeling like -3C in the wind in morning.
Freezing Level
Generally above the summits, but just at dawn slight frost some valleys and sheltered higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 9th May 2025
Last updated
Tue 6th May 25 at
4:00PM
How windy? (On the summits)
Variable or easterly 10-15mph or less.
Effect of the wind on you?
Small
How Wet?
No rain
Cloud on the hills?
Not expected
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Sunshine and patchy fair-weather cloud. Visibility excellent.
How Cold? (at 900m)
5C rising to 11C by afternoon.
Freezing Level
Above the summits
Planning Outlook
A quiet spell of weather as high pressure continues to dominate over the British Isles this week and likely into next week too. Generally dry conditions, low risk of an isolated afternoon shower. Sunshine and variable cloud, at times covering the sky, but generally above the mountain tops with excellent visibility. Winds mostly light, direction variable. Slight frosts at dawn in sheltered spots. Becoming pleasantly warm into afternoons, generally warmer by the weekend. Possibly local bursts of rain forming Sunday into early next week, mainly Wales. Very dry ground conditions, beware high risk of fire.