Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
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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.
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.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 4th September 2026
Last updated
Thu 3rd Sep 26 at
4:30PM
Summary for all mountain areas
Gales over high terrain in all areas, severe on higher mountains making progress very challenging and feeling cold. Showery rain, most frequent in western Scotland, scattered heavy bursts passing eastward. Remnants of overnight rain soon clears from Wales to be more often dry, less windy southwards.
Headline for Eryri / Snowdonia National Park
Windy, gales on tops. A little rain, then often dry.
How windy? (On the summits)
Westerly 30 to 45mph, speeds fluctuating during day, strongest more often over northern tops, where gusts over 50mph at times.
Effect of the wind on you?
Strenuous-to-arduous walking conditions, frequent buffeting knocking you off balance on exposed tops and ridges. Considerable wind chill.
How Wet?
Patchy rain at first clearing
Overnight prolonged heavy rain clears around dawn, leaving it very wet underfoot and fast-flowing streams. Some residual patches of light rain over western hills, becoming more often dry from mid-late morning.
Cloud on the hills?
Often capping higher western tops
Cloud banks at varied heights from dawn, tending to lift and break early morning toward upper slopes, but patches then come and go on tops all day, most often in west above 800m. Better breaks eastward.
Chance of cloud free summits?
Rising to 50%, or 70% east tops.
Sunshine and air clarity?
Fairly cloudy, occasional sun mostly east more frequent into afternoon as high cloud tends to thin. Visibility good, some coastal haze.
How Cold? (at 900m)
7 or 8C, little change all day. Directly in wind feeling like -3C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 5th September 2026
Last updated
Thu 3rd Sep 26 at
4:30PM
How windy? (On the summits)
Westerly 25-30mph at dawn, easing during morning to 15mph, turning SW'ly; tending to rise again, risk 40mph+ into night.
Effect of the wind on you?
Breezy and cool start, lessening to be soon small. Becoming blustery again later in day.
How Wet?
Possibly a little rain west
Odd drizzly showers over west coastal hills early in day, soon fading. During afternoon, chance of some rain extending in from southwest.
Cloud on the hills?
Mostly clearing
Patchy cloud over some slopes above 700m early morning in western areas, well broken inland. Tending to lift and break, some patches may return if rain occurs.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Glimpses of sun, best in east in morning; high cloud thickening to cover the sky. Visibility very good.
How Cold? (at 900m)
7C rising to 10C afternoon, little change or rising a degree or so higher evening/night. Feeling near 0C in wind early morning.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 6th September 2026
Last updated
Thu 3rd Sep 26 at
4:30PM
How windy? (On the summits)
South to southwesterly 35 to 50mph, very gusty in places, including downslope north of major summits.
Effect of the wind on you?
Frequent buffeting across the hills, walking and balance challenging in places. Feeling cool in exposure despite warm air.
How Wet?
A little rain west
Drizzle and some light rain for periods mainly coastal hills.
Cloud on the hills?
Often covering coastal slopes
Varied low cloud, but may cover areas near Irish Sea all day, but bases higher inland north and eastward with breaks.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Glimpses of weak sun mainly north/east. Hazy.
How Cold? (at 900m)
12C, humid all day, rising to 14 or 15C, locally warmer northeast. Feeling like 5C directly in the wind.
Freezing Level
Above the summits.
Planning Outlook
Generally unsettled through the next week with spells of rain and showers moving in from the Atlantic, accompanied by frequently strong to gale force mountain winds. A window of better weather and less wind on Saturday, but further rain moves into Scotland from the southwest by Saturday night into Sunday, heaviest northwest Highlands; gales also return to many mountains by Sunday. Temperatures will vary, mildest toward the south, but cooler air moves in from the north at times next week bringing higher Scottish tops occasionally close to freezing point. Indications favour improving weather patterns during mid-month.