Snowdonia National Park Forecast

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

Viewing Weather Forecast for Monday 23rd September 2019
Forecast last updated on Sunday 22nd September 2019 at 4:01pm

Today | Tuesday | Wednesday

Summary for all mountain areas

The remnants of several fronts will give extensive fog and patches of rain and drizzle after dawn. Conditions will slowly improve: most rain will die out and generally cloud base progressively rise. Wales, after a lull to some sun will deteriorate quickly from SW afternoon.

Headline for Snowdonia National Park

Deteriorating toward dusk: strong upland winds, rain and low cloud.

How windy? (On the summits)

Southwesterly 20mph morning. Will then back southerly and strengthen quickly to 40mph.

Effect of wind on you?

Mostly small - but increasingly difficult walking conditions late in the day.

How Wet? (Precipitation and its impact)

Threat rain by dusk

Rain setting in from west late afternoon.

Cloud on the hills?

Extensive at first, but summits extensively free of cloud afternoon

Higher tops may well be covered for a few hours after dawn, but should clear by late morning. However, anticipate cloud base to drop again quickly late in day in rain.

Chance of cloud free summits?

80% for several hours middle of day; post dawn and by dusk 20%

Air clarity (below cloud)

Patchwork of sun before high level cloud thickens in afternoon. Visibility excellent - but late on poor in rain.

How Cold? (at 900m)


Freezing Level

Above the summits.

Planning Outlook

All mountain areas of Britain from Tuesday 24th September 2019

Low pressure will dominate the weather all week, bringing frequent rain and low cloud, and intermittently strong upland winds. As several areas of low pressure track across the country, the weather pattern will often be complicated, making day to day local detail difficult to forecast. However, there remains strong evidence that the driest area will be areas near and north of the Great Glen.

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