Snowdonia National Park Forecast

Viewing Weather Forecast for Wednesday 23rd January 2019

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

Today | Thursday | Friday

Forecast last updated on Tuesday 22nd January 2019 at 2:20pm

Summary for all mountain areas

A cold but generally dry and sunny day for many areas. Terrain widely frozen from valleys upward following some very low night temperatures. Local snow showers or flurries, focused around western coastal hills. Fragments of cloud on some higher slopes. The air very clear.

Headline for Snowdonia National Park

Snow showers or flurries. Terrain frozen. Chilly breeze.

How windy? (On the summits)

North backing northwesterly, 20-25mph early morning, easing to 15mph by afternoon.

Effect of wind on you?

Fairly small, but noticeable chill where exposed on high tops in morning.

How Wet? (Precipitation and its impact)

Snow showers; locally may be very frequent.

Generally just occasional snow showers or flurries focused on Snowdon range and hills north of the A5. Locally near or just east of the Snowdon range, showers coming in from the Irish Sea may form a band of almost persistent snow for an hour or more, giving a risk of whiteout.

Cloud on the hills?

Extensive, particularly Snowdon range

Typically cloud base 850m, dropping to 500m near showers. But over or east of Snowdon range, there may well be areas where cloud persists above 500m for several hours. Elsewhere, the summits often clearing.

Chance of cloud free summits?

40%, or 70% mid-Wales.

Sunshine?
Air clarity (below cloud)

Bursts of sunshine Snowdon range; patchwork of sun elsewhere. The air very clear, but visibility reduced significantly in snow.

How Cold? (at 900m)

-4C. Where exposed to wind, feeling close to -12C.

Freezing Level

350-500m, highest near west coast, but most inland terrain frozen from valleys up. Partial thawing lowest coastal areas and elsewhere on lower sunlit slopes.

Planning Outlook

All mountain areas of Britain from Thursday 24th January 2019

Cold conditions are expected to prevail across the mountains over the next week or fortnight - perhaps longer. Mountain temperatures will frequently be sub-freezing, often to lower slopes in Scotland. Wind speeds very varied day-to-day, at times up to gale force with severe chill factor. Over the next 5 days or so, winds will be mostly from the west or northwest, allowing briefly less cold air to affect England & Wales in particular. Whilst there is some uncertainty, indications into next week favour a cyclonic situation, with areas of precipitation circling around a broad area of low pressure, with scope for locally substantial snowfalls on the mountains. A northeasterly flow may well emerge for a few days.