Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday'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.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Warm
Comfortable temperatures on the hills, rising above 10C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
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.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Warm
Comfortable temperatures on the hills, rising above 10C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
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
Thursday 1st May 2025
Last updated
Wed 30th Apr 25 at
4:29PM
Summary for all mountain areas
Showery bursts and breezy in Scotland, notably west and northwest; risk of gales in the far north. Fells of northern England largely cloud-free with an odd spot of rain. Mostly sunny with gentler winds central and south Pennines. High cloud over clear mountains building in Wales with risk of thundery downpours evening into night.
Headline for Eryri / Snowdonia National Park
Morning sun clouding over; risk thundery showers after dusk
How windy? (On the summits)
South or southwesterly 10mph or less, at times little wind. Possible sudden gusts during or just before rain locally.
Effect of the wind on you?
Mostly small
How Wet?
Risk local thunderstorms later; substantially dry during daylight
An odd spot of rain after noon as high cloud builds. Isolated thundery downpours into evening and night in southernmost areas, greatest risk mid-Wales.
Cloud on the hills?
Hills clear; cloud banks forming from the north around dusk
Hills largely clear during daylight. Where thundery showers occur later, bases may reach high terrain. Around dusk and after, cloud banks will intermittently form above 1000m.
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Extensive sunshine in the morning. Patchy cloud building after noon. Good visibility, but some haze.
How Cold? (at 900m)
12 or 13C, rising slightly during daylight.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 2nd May 2025
Last updated
Wed 30th Apr 25 at
4:29PM
How windy? (On the summits)
Mostly northerly, 15mph, occasional 20-25mph mainly northern areas.
Effect of the wind on you?
Fairly small, but feeling chilly in exposure on high tops.
How Wet?
Possible early light rain
Risk of patchy rain from overnight into early morning, most likely toward mid-Wales. Fading out to leave a dry day.
Cloud on the hills?
Lifting and clearing
Possible varied cloud banks over hills from dawn into early morning, lifting toward then above most tops by middle of day, may largely disperse.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Some sun breaking through as high cloud thins and disperses through the afternoon. Visibility becoming excellent, but may be hazy for several hours.
How Cold? (at 900m)
6 to 9C, coolest north; only small rise. Wind chill feeling like -2C around northern high tops.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 3rd May 2025
Last updated
Wed 30th Apr 25 at
4:29PM
How windy? (On the summits)
Northerly 15mph at dawn. Rising towards 25-30mph with a slight northeasterly shift. Notable gusts.
Effect of the wind on you?
Notable buffeting and balance challenges on exposed ridges. Feeling chilly.
How Wet?
Little if any
Small chance of isolated showery rain
Cloud on the hills?
Soon clearing mountains
Banks of cloud over highest tops at dawn, some bases covering more high terrain from Glyder Fawr northward. Bases lift through the morning, clearing all terrain
Chance of cloud free summits?
Soon above 90%
Sunshine and air clarity?
Mostly sunny, some fair weather cloud developing through the day. Visibility excellent.
How Cold? (at 900m)
7 or 8C. Feeling near or just above freezing in the wind.
Freezing Level
Above the summits
Planning Outlook
Northerly winds will facilitate cold temperatures over the weekend; freezing levels will drop to mid-slopes for much of the Highlands by Sunday, further extending into England and Wales into the early week. Bursts of showers will accompany this transition, mainly in the north, then fading into only light showers here and there, falling as snow flurries on high terrain. Further into next week, risk spells of chilly and strong west-northwesterly winds particularly for the Highlands, some showery days; freezing level will vary. Very dry ground in places with fire risk.