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.
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.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
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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.
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.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 14th September 2026
Last updated
Sun 13th Sep 26 at
4:18PM
Summary for all mountain areas
Humid southwesterly air brings extensive low cloud and drizzle to many mountains. Locally drier with some cloud breaks toward northeast of major mountain groups. Around Skye generally wet all day, whilst more prolonged heavier rain likely moves into southwest Scotland afternoon-evening. Strong and gusty winds.
Headline for Eryri / Snowdonia National Park
Blustery, gusty; low cloud, drizzle, especially west.
How windy? (On the summits)
Southwesterly 30 to 40mph, speeds generally rising in afternoon to 50mph on high tops, some notable strong gusts high passes and some downslopes.
Effect of the wind on you?
Some variations, but often affecting comfortable walking, likely frequent buffeting over high mountains, very gusty in places affecting stability, not just highest terrain. Marked chill factor despite mild air.
How Wet?
Drizzly much of day west, some rain
Drizzle and light rain in the west from dawn, periods of steady light rain over western hills, occasional heavier falls. Patchier small amounts further east, locally often dry. Onward into night, periods of more sustained heavy rain.
Cloud on the hills?
Extensive very low cloud
Blanket cloud shrouding the hills, from lower slopes upward toward Cardigan Bay, extensive above 400-500m even well inland, but some higher breaks locally north Carneddau to Bala/Berwyn groups, occasionally to upper slopes.
Chance of cloud free summits?
Below 10% west, local 30% north/east.
Sunshine and air clarity?
Overcast and dull, misty or murky to lower slopes in west, local brighter areas north and easternmost areas.
How Cold? (at 900m)
14C, humid, little change all day, then starting to lower slightly into night. Feeling like 0 to 3C directly in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 15th September 2026
Last updated
Sun 13th Sep 26 at
4:18PM
How windy? (On the summits)
Westerly 25 to 30mph, possibly 35-40mph just at first.
Effect of the wind on you?
Blustery across the mountains, affecting comfortable walking with some buffeting in exposure and marked wind chill.
How Wet?
Intermittent rain
Overnight rain likely clears eastward around dawn. Then occasional showery rain, most common on western hills in the morning, brief heavier showers passing eastward during the day, may become more frequent.
Cloud on the hills?
Varying on higher tops
Ragged cloud banks above 600-800m at first, soon mostly confined to 800-900m, but here may come and go for a few hours, some breaks forming at times
Chance of cloud free summits?
40%
Sunshine and air clarity?
Occasional sun mostly toward east. Visibility often very good, briefly reduced in showers.
How Cold? (at 900m)
8 to 11C, mildest early in day, trending cooler during daytime. Feeling close to 0C in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 16th September 2026
Last updated
Sun 13th Sep 26 at
4:18PM
How windy? (On the summits)
A gusty northwesterly 25-35mph, lessening somewhat and shifting westerly, later southwesterly 20-25mph.
Effect of the wind on you?
A blustery start, buffeting affecting stability in exposure and feeling chilly. Easing to fairly small effects.
How Wet?
Drizzle, some patchy rain
Drizzly from the Llyn Peninsula towards Carneddau, to lower areas in the early morning, lifting to high terrain afternoon and increasingly breaking up. Some patchy rain too, this also breaking up. Little rain reaches Berwyn group.
Cloud on the hills?
Extensive to start, improving
Blanket cloud to at least most middle slopes to start, to lower slopes nearest Anglesey. Cloud more broken east of high tops but also misty on some low terrain too. Cloud lifts, to largely 800m and breaking up somewhat, though clinging to high tops.
Chance of cloud free summits?
Rising to 40%
Sunshine and air clarity?
Patchy sun breaks out, most notably on lower slopes, high cloud from the west later. Good visibility.
How Cold? (at 900m)
7 or 8C. Feeling near or below freezing in direct wind early.
Freezing Level
Above the summits.
Planning Outlook
Staying unsettled during the next week to 10 days as westerlies prevail - areas of low pressure passing north of Scotland with frontal systems bringing frequent rain, wettest over western mountains in Scotland. Often windy, sustained periods of gale-force westerly winds over higher terrain. Fairly cool by Tuesday onward, close to freezing on highest Scottish summits on Wednesday morning, possibly again for a time next weekend; often considerable wind chill on the mountains. Higher pressure and better weather tends to expand further north later in month.