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Eryri / Snowdonia National Park Forecast

Eryri / Snowdonia National Park

Includes all summits in the the northern half of Wales from Pumlumon northwards.

Today's Forecast

Light wind, negligible impact
Dry, Inversion
Hazy, some fog banks
Cool to mild

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Click here to download the latest PDF Last Updated Tue 14th Oct 25 at 4:10PM Last Updated Tue 14th Oct 25 at 4:10PM
View our low-graphics version Last Updated Tue 14th Oct 25 at 4:10PM Last Updated Tue 14th Oct 25 at 4:10PM

Viewing Forecast For

Eryri / Snowdonia National Park
Wednesday 15th October 2025
Last updated Tue 14th Oct 25 at 4:10PM

Summary for all mountain areas

High Scottish Highland tops remain above an inversion except in the far north; cloud becoming well broken in many areas. Variable morning cloud in England and Wales lifts to or off higher slopes with sun breaks. Highest Lakeland and Snowdonia tops at or above cloud tops. Feeling mild for most, an easterly breeze in Wales.

Headline for Eryri / Snowdonia National Park

High tops above cloud, most extensive east

How windy? (On the summits)

East-northeasterly 10-15mph. Gusty on higher hills, reaching up to 20mph or higher towards mid-Wales.

Effect of the wind on you?

Fairly small, though strongest gusts on southernmost hills starting to affect comfort of walking.

How Wet?

No rain expected

Cloud on the hills?

Highest tops above cloud, the layer most extensive east

From dawn, cloud banks at various heights, mostly below 700-800m and more extensive across Berwyn group - Snowdon likely above the cloud layer. Bases will lift to around 600-800m, well broken west of Snowdonia high terrain, only somewhat breaking east.

Chance of cloud free summits?

80% (highest summits above cloud)

Sunshine and air clarity?

Mostly sunny on high tops and western mountains of Snowdonia NP; some glimpses breaking out later in the east. Very hazy in the morning below the cloud layer, excellent visibility above.

How Cold? (at 900m)

8 or 9C, cooler in the valleys at dawn. May rise to 10C on highest tops above the inversion layer.

Freezing Level

Above the summits

Viewing Forecast For

Eryri / Snowdonia National Park
Thursday 16th October 2025
Last updated Tue 14th Oct 25 at 4:10PM

How windy? (On the summits)

Direction variable through trending east-southeasterly 10mph or less. Some odd stronger gusts may blow.

Effect of the wind on you?

Small

How Wet?

No rain expected

Cloud on the hills?

Patchy cloud on east slopes

Patchy cloud at various low and middle heights towards east Wales, very little cloud on Snowdonia. Some cloud tending to form at upper elevations in the east as the day goes, though many slopes and highest tops often clear.

Chance of cloud free summits?

70%

Sunshine and air clarity?

Often sunny west of high tops. Highest terrain possibly above cloud in very clear air, hazy lower down but improving.

How Cold? (at 900m)

6 to 8C. Starting cooler in the valleys, particularly west of high tops.

Freezing Level

Above the summits

Viewing Forecast For

Eryri / Snowdonia National Park
Friday 17th October 2025
Last updated Tue 14th Oct 25 at 4:10PM

How windy? (On the summits)

Generally southeasterly though variable, around 10mph. Rising towards 15mph around nightfall.

Effect of the wind on you?

Mostly small

How Wet?

No rain expected

Cloud on the hills?

Lifting to high terrain, some breaks

Banks of cloud on mid and upper slopes with patches lower down at dawn, some local valley mist possible. Cloud lifts to high terrain, breaking occasionally for clear summits.

Chance of cloud free summits?

50%

Sunshine and air clarity?

Intermittent sunshine, some high cloud around. Good visibility though some haze.

How Cold? (at 900m)

6C

Freezing Level

Above the summits

Planning Outlook

High pressure weakens as the weekend approaches: varied low cloud and valley fog remain likely in the mornings, causing damp surfaces and slippery rock-faces. Cloud lifts higher during the day, starting to shroud mountain peaks more often, cooler temperatures returning to the high tops. Local cloud breaks, best of breaks in west Wales, though a haze will linger on low slopes of southern Scotland, England, and Wales - clearer air likely below the cloud in the Scottish Highlands. Light winds overall, an easterly breeze for Wales. The weekend sees a transition to low pressure. Winds will rise and more high cloud will reduce sunshine, rain then arriving late weekend and coming and going into the next week. Timing and location of rain uncertain for now.