Snowdonia National Park Forecast

Viewing Weather Forecast for Wednesday 15th August 2018

Also includes higher summits south to Plynlimon.

Today | Thursday | Friday

Forecast last updated on Tuesday 14th August 2018 at 1:43pm

Summary for all mountain areas

Strong southwesterly winds, reaching near gale force on some tops, will result in low cloud shrouding the hills, extensively and to lower slopes in the west where rain and drizzle will be frequent. Highest cloud bases likely over the Cairngorms.

Headline for Snowdonia National Park

Windy with extensive fog and patchy drizzle. Heavier rain later.

How windy? (On the summits)

Southwesterly 35mph to on higher western mountains (particularly Snowdon range) 45mph.

Effect of wind on you?

Walking increasingly arduous across the hills, and on higher areas progress often difficult.

How Wet? (Precipitation and its impact)

Drizzly, rain turning heavier later

Drizzly rain occasionally westernmost mountains, mainly Lleyn peninsula to western slopes of Snowdon. Then, most likely afternoon, a band of rain will slowly extend southeastwards across region.

Cloud on the hills?

Extensive: covering lower summits

Extensive fog across the mountains, widely forming below 300m Lleyn peninsula to Snowdon and 300 to 500m most western mountains. Cloud base rising toward 750m easternmost Wales, and may well sometimes clear higher tops.

Chance of cloud free summits?


Air clarity (below cloud)

Dull with frequent poor visibility, although good visibility and a little sunshine east Wales.

How Cold? (at 900m)


Freezing Level

Above the summits.

Planning Outlook

All mountain areas of Britain from Thursday 16th August 2018

Rain (a mix of showery days and those when rain sets in for a few hours) at some stage most days over the coming week or so. The heaviest and most persistent rain will be on western mountains, where fog will frequently shroud higher areas. Bands of upland gales or near gales will come through; the windy conditions most prolonged on the Scottish Highlands.