Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday's Forecast
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
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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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
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
Tuesday 6th May 2025
Last updated
Mon 5th May 25 at
4:00PM
Summary for all mountain areas
Fine with strong sunshine for most places, beware sunburn. A little fair-weather cloud into the afternoon. Warming up after a chilly start with frost. Cloud banks affect west coastal mountains north from Mull in the morning, tending to lift and thin with time. Light winds overall.
Headline for Eryri / Snowdonia National Park
Mostly sunny, light breezes.
How windy? (On the summits)
North to northeasterly 10mph, occasional 15mph.
Effect of the wind on you?
Negligible
How Wet?
No rain
Cloud on the hills?
Not expected
Chance of cloud free summits?
Practically certain
Sunshine and air clarity?
Extensive or unbroken sunshine. Excellent visibility, although slight haze, particularly morning.
How Cold? (at 900m)
4C at dawn; rising as high as 10C afternoon.
Freezing Level
Above the summits, but at dawn frost some upland and lowland valleys.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 7th May 2025
Last updated
Mon 5th May 25 at
4:00PM
How windy? (On the summits)
North to northeasterly 10-15mph, increasing later in day to 20mph, local gusts 25mph around high tops.
Effect of the wind on you?
Fairly small, but feeling increasingly chilly as the breeze freshens.
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. Visibility excellent.
How Cold? (at 900m)
4C at dawn, rising as high as 10C afternoon, but later in the breeze feeling much cooler, nearer 3C toward evening.
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
Mon 5th May 25 at
4:00PM
How windy? (On the summits)
Easterly 20mph, in places gusty 25-30mph 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.
Planning Outlook
A quiet spell of weather as high pressure continues to dominate over the British Isles this week and very possibly well into next week too. Generally dry conditions, low risk of an isolated afternoon shower. Winds mostly light, direction variable. Chilly nights with frost in valleys and sheltered higher terrain. Becoming pleasantly warm into the afternoons. Sunshine and variable cloud, at times covering the sky, but generally above the mountain tops with excellent visibility. Very dry ground conditions, beware high risk of fire.