Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
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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.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 7th September 2026
Last updated
Sun 6th Sep 26 at
4:18PM
Summary for all mountain areas
Showers in west Scotland from dawn, spreading east. Gales across the highlands, severe northwest, feeling cold. Early rain in England and Wales breaks for sun through high cloud, windy in the north. Prolonged rain arrives into south Scotland from midday, spreading into north England with time, and later Wales.
Headline for Eryri / Snowdonia National Park
Early rain clears for weak sun, later returning; breezy
How windy? (On the summits)
Westerly 25 to 30mph, gusty over the high tops. Later, beginning to rise, shifting southwesterly, sustained 40mph as evening approaches and further rising for several hours after dusk.
Effect of the wind on you?
Ease of walking impacted all day in exposure, buffeting gusts affecting stability, becoming more strenuous later in the day with notable wind chill.
How Wet?
Early and late showery rain, otherwise dry
Rain from overnight may continue through dawn, but soon breaking up to leave only spotty showers, fading for a largely dry window. Patchy rain will return through afternoon, mostly western areas, and setting in more persistently into evening, heavy falls forming.
Cloud on the hills?
Lifting to tops, some afternoon breaks
Early varied cloud over the hills, fairly extensive towards Cardigan Bay, but soon lifting during morning to mostly patches over higher tops, breaks best Carneddau to Bala. May be more extensively clear for a few afternoon hours, but patches begin reforming on high tops to the north, filling in more widely into night.
Chance of cloud free summits?
Rising to 60% for a few afternoon hours
Sunshine and air clarity?
Glimpses of sun mainly northeast areas, increasing sun but through high cloud. A slight haze, particularly western hills, but visibility often good.
How Cold? (at 900m)
7 or 8C, rising a degree. Feeling like 0 to -3C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 8th September 2026
Last updated
Sun 6th Sep 26 at
4:18PM
How windy? (On the summits)
Westerly 30-40mph, variable, near the higher end of the range for a time.
Effect of the wind on you?
Strenuous walking in exposure, strongest gusts will challenge stability with considerable wind chill.
How Wet?
Scattered showers
Showers come and go from the northwest through the day, generally on the lighter side, but a rising risk of more frequent showers with local heavy falls as afternoon goes.
Cloud on the hills?
Mostly just summits, varied broader banks
Cloud over high terrain early, lowest bases to the west including to mid-Wales as low as 500m. A lifting trend, bases return lower during showers, and later longer periods of lower cloud as bands of rain become more frequent.
Chance of cloud free summits?
40%
Sunshine and air clarity?
A patchwork of sunshine, best on low eastern slopes, cloudier later. Good visibility though some haze near coasts.
How Cold? (at 900m)
7C. Feeling just below freezing in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 9th September 2026
Last updated
Sun 6th Sep 26 at
4:18PM
How windy? (On the summits)
Northwesterly 25-35mph to start, easing and shifting westerly, 15-20mph afternoon and later less.
Effect of the wind on you?
Blustery on tops to start, a chilly feeling, easing to small effects with time.
How Wet?
A little rain, mostly early
Patchy rain drifts into Snowdonia NP and the Llyn Peninsula from before dawn, gradually breaking up and becoming substantially dry with time. Little or no rain reaches hills near Bala.
Cloud on the hills?
Rising to high Snowdon group summits
Fairly extensive above middle slopes to start, particularly Llyn Peninsula to Carneddau, but lifting and breaking up, hills southeast of Snowdon group substantially clearing. Banks roll over highest summits but breaks will for here too.
Chance of cloud free summits?
Rising to 50%
Sunshine and air clarity?
Sun increasingly frequent, particularly towards east Wales. Good visibility, a little early haze.
How Cold? (at 900m)
7C, rising a degree, or to 9C towards Berwyn group. Feeling just below freezing to start, wind chill effect easing.
Freezing Level
Above the summits.
Planning Outlook
Generally unsettled through next week with spells of rain and showers moving in from the Atlantic, accompanied by strong to gale force mountain winds. Temperatures will vary, mildest toward the south, but cooler air moves in from the north at times bringing higher Scottish tops occasionally close to freezing point, feeling cold in the wind chill. A few high pressure ridges bring settled windows, notably afternoons of Wednesday and Friday; northwestern areas, particularly in Scotland, will tend to hold onto some hill cloud despite high pressure. An unsettled weekend is indicated, followed by a rising chance of longer settled windows from mid-month, particularly England and Wales. Temperatures will be generally near or above average, best sunny windows east hill groups.