Eryri / Snowdonia National Park

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

Today's Forecast

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Click here to download the latest PDF Last Updated Sat 14th Sep 24 at 4:05PM
View our detailed version Last Updated Sat 14th Sep 24 at 4:05PM

Viewing Forecast For

Eryri / Snowdonia National Park
Sunday 15th September 2024
Last updated Sat 14th Sep 24 at 4:05PM

Summary for all mountain areas

Often strong winds across most hills, feeling chilly especially Scottish tops. A zone of frequent rain and heavy showery bursts passes eastwards across the Highlands, particularly northern areas. A front moves slowly south over England and Wales bringing rain, drizzle and low cloud, gradually clearing northern England later.

Headline for Eryri / Snowdonia National Park

Windy, rain, drizzle and low cloud, much of the day west.

How windy? (On the summits)

West to southwesterly 30 to at times 40mph, strongest over Snowdon range until later afternoon.

Effect of the wind on you?

Walking often impeded by the wind, and sometimes arduous with considerable wind chill.

How Wet?

Rain and drizzle, manly western hills

A mix of periods of drizzly rain - mostly western hills and one or two bursts of heavier rain. Little rain mid Wales, particularly Berwyn mountains.

Cloud on the hills?

Mountains mostly covered; highest cloud base east Wales

Cloud will often shroud mountains from lower slopes upward toward west coast (lowest Lleyn peninsula to Snowdon). Highest cloud bases will be east Wales and perhaps mid Wales where cloud rarely below 500m, and breaks to 750m.

Chance of cloud free summits?

10%, to 30% east Wales

Sunshine and air clarity?

Little if any sunshine - occasional sun here and there lower slopes east Wales. Hazy and visibility often poor in drizzle.

How Cold? (at 900m)

9C, but where exposed to the wind, will feel near or below freezing point on highest tops.

Freezing Level

Above the summits.

Viewing Forecast For

Eryri / Snowdonia National Park
Monday 16th September 2024
Last updated Sat 14th Sep 24 at 4:05PM

How windy? (On the summits)

Varied direction; 10mph or less, locally southerly 10-15mph on/nearest Llyn peninsula.

Effect of the wind on you?

Negligible

How Wet?

Rain very unlikely

Cloud on the hills?

Very little if any

Chance of cloud free summits?

90%

Sunshine and air clarity?

Bright sunshine and superb visibility although ribbons of fog some valleys will disperse through morning.

How Cold? (at 900m)

9 rising to 14C

Freezing Level

Above the summits.

Viewing Forecast For

Eryri / Snowdonia National Park
Tuesday 17th September 2024
Last updated Sat 14th Sep 24 at 4:05PM

How windy? (On the summits)

Variable and little wind at first, becoming easterly, tending to increase 10 to 20mph, gustier later in day.

Effect of the wind on you?

Small, but starting to feel breezier over the hills.

How Wet?

Rain not expected

Cloud on the hills?

Hills clear

Possible brief patches of misty cloud drifting onto slopes in eastern mid-Wales early in day, soon all dispersing.

Chance of cloud free summits?

Above 90%

Sunshine and air clarity?

Extensive sunshine. Some mist or haze in valleys early in day, otherwise visibility excellent.

How Cold? (at 900m)

13C, locally slightly warmer western areas into afternoon. (Tops warmer than valleys early morning).

Freezing Level

Above the summits.

Planning Outlook

High pressure becomes established over Britain at the start of the new week, drifting toward Scandinavia by midweek. A weak front grazing past northwest Scotland on Tuesday brings low cloud and some possible dampness for a time here. Otherwise, very warm and particularly on western mountains often sunny. However, particularly in the mornings low cloud coming in off the North Sea will often envelop more eastern mountains from midweek. Fresh easterly breezes affecting England and Wales in the second half of the week, locally becoming very gusty. Lighter winds generally in Scotland.