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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.

Friday's Forecast

Light wind, negligible impact
Patchwork of cloud and sun
Hazy, some fog banks
Cool to mild

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Click here to download the latest PDF Last Updated Thu 16th Oct 25 at 4:25PM Last Updated Thu 16th Oct 25 at 4:25PM
View our low-graphics version Last Updated Thu 16th Oct 25 at 4:25PM Last Updated Thu 16th Oct 25 at 4:25PM

Viewing Forecast For

Eryri / Snowdonia National Park
Friday 17th October 2025
Last updated Thu 16th Oct 25 at 4:25PM

Summary for all mountain areas

Varied areas of low cloud / fog in morning, some highest tops just poking above an inversion, mainly southwest-central Highlands, possibly Snowdon group and Lakeland high tops. Cloud tending to rise, some breaks locally. A thicker cloud layer north-east Highlands, local drizzle. SE'ly breeze starting to increase.

Headline for Eryri / Snowdonia National Park

Patchy low cloud / early fog banks, some sun. Light wind til late.

How windy? (On the summits)

South to southeasterly, though variable early in day, around 10mph. Rising towards 15mph toward dusk, 20-25mph into night, local stronger gusts developing.

Effect of the wind on you?

Mostly small; feeling breezier later in day.

How Wet?

No rain expected

Cloud on the hills?

Varied low cloud and fog, rising to high terrain, some breaks

Banks of cloud on some mid and upper slopes from dawn, some local valley mist possible. Local clearer areas. Highest summits may start near or just above the cloud, but this lifts onto high terrain, then breaking occasionally for clear hills afternoon.

Chance of cloud free summits?

50%

Sunshine and air clarity?

Intermittent sunshine, possibly above early fog; some wispy cloud high in sky. Good visibility though some haze especially morning.

How Cold? (at 900m)

6C, feeling nearer freezing where breeze increases.

Freezing Level

Above the summits

Viewing Forecast For

Eryri / Snowdonia National Park
Saturday 18th October 2025
Last updated Thu 16th Oct 25 at 4:25PM

How windy? (On the summits)

Southeasterly, tending to increase 25 to 40mph, very gusty in places, especially later.

Effect of the wind on you?

Blustery, challenging conditions in places higher mountains, affecting comfortable walking and balance on ridges.

How Wet?

Rain unlikely until late

Some patchy rain may encroach from west later in day, then more persistent into the night.

Cloud on the hills?

Good breaks north

Patchy cloud on some slopes in morning, highest tops may start near or just above these patches. Cloud lifting to the tops locally for a time, but breaking from most hills, clearest most often in north Eryri.

Chance of cloud free summits?

60%

Sunshine and air clarity?

Glimpses of sun, best in north. An increasing veil of high cloud. Visibility good, but some haze.

How Cold? (at 900m)

6C, but feeling nearer -5C in the wind.

Freezing Level

Above the summits

Viewing Forecast For

Eryri / Snowdonia National Park
Sunday 19th October 2025
Last updated Thu 16th Oct 25 at 4:25PM

How windy? (On the summits)

South to southeasterly, 35 to 50mph, speed may vary during day, gusty for periods around high tops.

Effect of the wind on you?

Expect challenging conditions over the mountains, frequent buffeting gusts affecting balance. Marked wind chill.

How Wet?

Persistent rain, heavy for a time

Risk of rain much of the day, in the morning may be patchier and lighter, less toward the north coast. Several hours of heavier rain setting in from the southwest. May ease from west later.

Cloud on the hills?

Extensive, higher north

Shrouding higher mountains likely all day, forming to mid-slopes many western areas, highest breaks north of the A5.

Chance of cloud free summits?

20%

Sunshine and air clarity?

Sun unlikely, overcast, murky in rain. Local better visibility toward north for a time.

How Cold? (at 900m)

8C, small change with height on hills. Feeling near -5C directly in the wind.

Freezing Level

Above the summits

Planning Outlook

Southeasterly winds increase into the weekend, becoming gale force on many hills into Sunday. A dry day on Saturday with variable cloud - some highest tops may start near or above the cloud mainly in Scotland, but the inversion largely gone by this time as cloud rises higher - best breaks during the day toward the northwest of major hill groups. Fronts moving in from the Atlantic by Sunday bring rain, which is likely to become heavy, especially Wales, then northern England, but uncertainty how fast this spreads into Scotland. A more unsettled outlook into next week with areas of rain and showers, which will vary locally day-to-day. Likely colder later in the week, may drop to freezing on highest mountains.