Snowdonia National Park Forecast

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

Viewing Weather Forecast for Monday 24th June 2019
Forecast last updated on Sunday 23rd June 2019 at 3:09pm

Today | Tuesday | Wednesday

Summary for all mountain areas

A warm and humid day with extensive low cloud affecting many hills and pulses of thundery rain moving north through the morning followed by further clusters of showers or thunderstorms. Becoming largely dry through the afternoon across Wales as winds veer southwesterly. Best of the cloud breaks will be towards the west coast.

Headline for Snowdonia National Park

Very humid. Risk isolated thunderstorms. Hill fog lifting PM.

How windy? (On the summits)

Southerly later southwesterly 10-20mph.

Effect of wind on you?


How Wet? (Precipitation and its impact)

Risk isolated thunderstorms.

Dry much of the day, but risk of isolated heavy showers/thunderstorms developing during the day.

Cloud on the hills?

Lifting to higher slopes PM.

Fog fairly extensive across the hills from dawn, in places to lower slopes. Bases will lift and break into the afternoon with cloud becoming confined to higher slopes with substantial clearances in the east.

Chance of cloud free summits?

20% morning, 70% afternoon.

Air clarity (below cloud)

Patches of sunshine developing. Murky, visibility reduced considerably by rain, and a general haze at best.

How Cold? (at 900m)

13C, very humid.

Freezing Level

Above the summits.

Planning Outlook

All mountain areas of Britain from Tuesday 25th June 2019

A very warm and humid week ahead, will become hot and exceptionally humid for a few days from around the middle of the week with the risk of isolated bursts of rain/thunderstorms; although many areas will miss these and stay dry. Some periods of low cloud across the hills; especially focused across eastern hills. Winds from an east or southeasterly direction and blustery at times. Increasing risk of a thundery breakdown over the weekend with fresher conditions arriving from the west.

Sponsored by
In association with
Mountaineering Council of Scotland Association of Mountaineering Instructions