Snowdonia National Park Forecast

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

Viewing Weather Forecast for Wednesday 20th November 2019
Forecast last updated on Tuesday 19th November 2019 at 3:14pm

Tomorrow | Thursday | Friday

How windy? (On the summits)

South or southeasterly 30 to 40mph, locally gusts 45-50mph around major western summits, particularly morning.

Effect of wind on you?

Walking arduous where exposed across the hills. Significant wind chill. Sudden strong gusts running downslope.

How Wet? (Precipitation and its impact)

Often dry; a little rain or drizzle

Occasional patches of drizzle around low cloud, snow flurries highest summits. Small amounts of rain may come and go on hills nearest west coast over several hours, mostly Lleyn Peninsula. Many areas seeing very little precipitation all day.

Cloud on the hills?

Fog many areas morning; breaks north

Risk of fog covering hills from valleys or lower slopes up in morning, particularly east & mid-Wales. Gradually into middle of day, this will lift into cloud mostly confined above 600m, most persistent east, and perhaps locally Lleyn Peninsula. Higher breaks mostly near/north of A5, some uncertainty, but may often clear above 700-800m.

Chance of cloud free summits?

10% morning many areas; 60% northern tops.

Air clarity (below cloud)

Sunshine rare, weak at best through high cloud north Wales. Hazy, or foggy to low levels some areas in morning.

How Cold? (at 900m)

1C. In exposure to strongest wind, feeling close to -15C.

Freezing Level

Just above highest summits.

Planning Outlook

All mountain areas of Britain from Thursday 21st November 2019

Areas of low pressure lying to the west & southwest of Britain will make gradual progress across the country later this week. A slow lift of temperature, although winter conditions will prevail across higher Scottish mountains through the weekend. Even next week in the Highlands, periods of thaw are expected to be short-lived. Occasional snowfalls. Least precipitation again in the far north/northwest. Tops in England & Wales more commonly above freezing point. Periods of rain or showers coming in from the south/southwest. Winds varied through weekend, but risk bouts of gales next week.

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