Snowdonia National Park Forecast

Viewing Weather Forecast for Thursday 23rd November 2017

Also includes higher summits south to Plynlimon.

Today | Friday | Saturday

Forecast last updated on Thursday 23rd November 2017 at 7:24am

Summary for all mountain areas

Cold air advances back southwards. A complex area of low pressure NE of Scotland brings areas of frequent or constant snow to the Highlands, although should tend to fade in central areas. Clusters of snow and hail showers for England & Wales, where upland winds up to storm force.

Headline for Snowdonia National Park

Severe upland gales. Showery; locally frequent snow/hail.

How windy? (On the summits)

Southwest later westerly; 40 to often 50mph. Will start to ease only into the afternoon.

Effect of wind on you?

Difficult conditions across the hills all day. Severe wind chill where exposed.

How Wet?

Snow and hail showers, locally setting in for an hour or more

Clusters of heavy showers spreading erratically from the west, which locally may result in constant snow and hail for several hours (rain below 600m). Some areas may escape often dry by afternoon. Very wet underfoot many rivers in spate, some flooding of rivers and paths.

Cloud on the hills?

Most persistent west

Cloud bases around 600-800m western hills, occasional patches below 500m around precipitation. Breaks to higher tops mostly frequent in east Wales by afternoon.

Chance of cloud free summits?

30% west; 60% east.

Sunshine and air clarity?

Rare glimpses of sun in the afternoon, mainly east Wales. Visibility often very good by afternoon, but very poor in rain and cloud.

How Cold? (at 900m)

-1 to -3C; generally falling through day. Where exposed, will feel as cold as -14C.

Freezing Level

700 to 800m, but by late afternoon, may be nearer 600m.

Planning Outlook

All mountain areas of Britain from Friday 24th November 2017

Frequently cold due to predominance of northerly winds until the end of the month, and perhaps into December. Snow will accumulate extensively in N and NE Scotland, less so elsewhere in Scotland. Nevertheless, only lowest slopes will see mostly rain, and periods of thaw up to highest summits will be rare. Over England and Wales, intermittent precipitation, often of snow on highest tops.