Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday'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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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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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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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
Tuesday 1st September 2026
Last updated
Mon 31st Aug 26 at
4:27PM
Summary for all mountain areas
A swathe of rain and gales sweeps across the Scottish Highlands, moving over the Southern Uplands with time; bright sun breaks and scattered showers follow from the northwest. Patchy rain for western hills of England and Wales, sunny breaks east. Blustery with rain increasing later in north England.
Headline for Eryri / Snowdonia National Park
Drizzle and some patchy rain comes and goes; breezy
How windy? (On the summits)
West to southwesterly 20 to 25mph, stronger gusts forming at times, and sustained winds may reach up to 30mph for a few later hours.
Effect of the wind on you?
Fairly small much of the day, but becoming blustery in exposure later in the day, gusts affecting stability and ease of walking.
How Wet?
Generally damp in west
A mix of drizzle and some showery rain rain much of the day over western hills. Smaller amounts further east.
Cloud on the hills?
Fairly extensive, lowest west
Banks of cloud often cap higher slopes above 700 to 800m, lowest near Cardigan Bay and variably lowering, sometimes towards 500m. Some breaks at times, best further east where only patchy on tops.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Patchy sunshine, best in eastern areas with some extended sunny windows, but high cloud will thicken and some cloudier moments too. Visibility reduced in rain, better if drier, more often east.
How Cold? (at 900m)
9C rising a degree, locally reaching 11C. Feeling just above freezing in exposure in strongest wind later.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 2nd September 2026
Last updated
Mon 31st Aug 26 at
4:27PM
How windy? (On the summits)
Southwesterly 30-40mph, gusty over the tops, and briefly strengthening with gusts approaching 50mph over tops.
Effect of the wind on you?
Strenuous walking in exposure much of the day, more arduous moments with considerable buffeting and wind chill.
How Wet?
Rain into drizzle
Several hours of morning rain, briefly heavy. Rain will ease into patches and gradually fade to just drizzle, mostly affecting summits and high west slopes.
Cloud on the hills?
Extensive
Cloud soon fills in extensively from 600m upward, often lower around rain, widely to 400m and lower towards Cardigan Bay. As rain eases, bases rise, some breaks approach 800m, best east, but also lowering again, any summit breaks unlikely.
Chance of cloud free summits?
20%
Sunshine and air clarity?
A few bright glimpses in the morning, but soon overcast and dull with poor visibility.
How Cold? (at 900m)
10C rising to 12 or 13C, staying elevated overnight. Feeling like 2 to 5C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 3rd September 2026
Last updated
Mon 31st Aug 26 at
4:27PM
How windy? (On the summits)
Southwesterly 20-35mph, trending towards lower speeds for a time but then a swathe of strong wind arrives late, above 50mph.
Effect of the wind on you?
Walking impeded in exposure, feeling chilly, effecting easing somewhat but significantly deteriorating into night.
How Wet?
Some patchy rain, most later
Some drizzle on high tops early, this fading, with patchy rain coming and going much of the day, some dry windows as well. A rising risk of more frequent rain through afternoon, and may set in persistently into night.
Cloud on the hills?
Fairly extensive, improving trend
Hills extensively shrouded to low slopes to start, a gradual lifting trend, mostly east Snowdonia/Carneddau areas but bases may only approach 900-1000m, and remaining more extensive on west slopes. Will later fill in again more widely.
Chance of cloud free summits?
Rising to 40%
Sunshine and air clarity?
A few bright glimpses but more often overcast. Locally good visibility where cloud lifts, more often poor on high tops and western hills.
How Cold? (at 900m)
12C, little change until later when approaching 14C for a few overnight hours. Feeling like 3 to 5C in direct wind.
Freezing Level
Above the summits.
Planning Outlook
Strong wind (often gale force on high mountains), patchy rain, and some broader swathes of rain and wind will affect the country from mid-week into the weekend; most notable areas of rain on Wednesday and late Thursday overnight into Friday. A few bright glimpses here and there, but many high summits stay shrouded, particularly western hill groups where cloud will often reach lower slopes. A brief bright window for some on Saturday, but staying windy with scattered showers in northwest areas, rain returning later and into Sunday. The next week remains generally unsettled, and may well bring a deep low pressure systems with widespread gales and swathes of heavy rain. Beyond next week, indications of a more settled regime for a time.