Mountain Weather
Information Service
Snowdonia National Park Forecast

Snowdonia National Park

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

Click here to download the latest PDF Last Updated Tue 16th Aug 22 at 4:50PM Last Updated Tue 16th Aug 22 at 4:50PM
View our low-graphics version Last Updated Tue 16th Aug 22 at 4:50PM Last Updated Tue 16th Aug 22 at 4:50PM

Viewing Forecast For

Snowdonia National Park
Wednesday 17th August 2022
Last updated Tue 16th Aug 22 at 4:50PM

Summary for all mountain areas

A ridge of high pressure will bring an improving day with low cloud breaking to reveal occasional sunshine. However, the legacy of a front across Wales and S Pennines will give low cloud and patchy drizzle in the morning, but brighter conditions will arrive into the afternoon, and the gusty northeast wind will ease.

Headline for Snowdonia National Park

Gusty winds, later easing. Patchy rain and low cloud, drier afternoon some breaks.

How windy? (On the summits)

Northeasterly 20 to 30mph in the morning, risk 35mph some tops. Will ease in the afternoon to become 10-15mph or less.

Effect of the wind on you?

Blustery conditions in morning, will impede walking at times across the hills. Strongest winds not necessarily on highest slopes. Easing in afternoon.

How Wet?

Patchy rain tending to fizzle out.

Patches of rain and drizzle, mainly in the south and east, will linger for a few hours after dawn, before tending to clear. A dry afternoon will follow.

Cloud on the hills?

Extensive, lifting and breaking up afternoon.

Areas of low cloud will shroud the hills extensively through the morning, although bases will gradually rise. Likely to lift further and break up from north in the afternoon with clearances, but patches may linger some tops.

Chance of cloud free summits?

20% lifting to 70% in afternoon.

Sunshine and air clarity?

Dull start, but cloud tending to break up to allow some occasional sun to develop. Murky start, then visibility improving to become very good.

How Cold? (at 900m)

9 to 11C

Freezing Level

Above the summits

Viewing Forecast For

Snowdonia National Park
Thursday 18th August 2022
Last updated Tue 16th Aug 22 at 4:50PM

How windy? (On the summits)

Southwesterly 10mph at dawn, increasing to 15 to 25mph through day, risk 30mph tops.

Effect of the wind on you?

May increasingly impede walking across higher slopes through the day.

How Wet?

Dry start, then heavy bursts of rain.

After a dry start to the day, thickening cloud will bring and increasing risk of heavy bursts of showery rain towards and more especially into the afternoon.

Cloud on the hills?

Increasingly covering the hills.

Some good breaks at first with many hills clear, bar a few patches. However, increasingly low cloud will form over higher slopes as showery rain moves in.

Chance of cloud free summits?

70% at first, lowering from west to 20%

Sunshine and air clarity?

Becoming increasingly cloudy with early patches of sun soon giving way. Visibility sometimes poor due to rain.

How Cold? (at 900m)

11 lifting to 13C

Freezing Level

Above the summits

Viewing Forecast For

Snowdonia National Park
Friday 19th August 2022
Last updated Tue 16th Aug 22 at 4:50PM

How windy? (On the summits)

West to southwesterly 15 to 25mph

Effect of the wind on you?

Mostly small

How Wet?

Occasional showers

Occasional passing showers through the day. These showers fairly brief, and many hills may well escape them and stay dry; especially in east Wales.

Cloud on the hills?

Covering tops for periods

Cloud will cover the fell tops for periods. Mostly early in the morning, when there may be banks to 600-700m, and again in showers. Breaks to tops otherwise.

Chance of cloud free summits?

60%

Sunshine and air clarity?

Patches of sun breaking through the cloud at times. Visibility good, but lowering in showers.

How Cold? (at 900m)

9 or 10C

Freezing Level

Above the summits

Planning Outlook

A more unsettled period of weather ahead over the coming week, as low pressure will be often anchored to the northwest of the British Isles. This will result in west to southwesterly winds prevailing, with periods of strong winds or even gales at times, with frequent rainfall across western mountains, and rainfall more occasional further east where the best of the dry and bright weather will occur. Generally cooler, but warm sectors will move in at times over England and Wales bringing an increase in humidity levels once again.