Snowdonia National Park Forecast

The Snowdonia National Park.

Viewing Weather Forecast for Tuesday 23rd September 2014

Forecast last updated on Monday 22nd September 2014 at 4:16pm

Summary for all mountain areas

A weak front will bring low cloud and a little rain slowly southwards to areas near the Irish Sea. Dry weather will follow, although the NW and later W highlands will deteriorate in the afternoon as the wind strengthens, and further low cloud and rain comes in.

Headline for Snowdonia National Park

Dull with drizzly rain and low cloud spreading slowly SE.

How windy? (On the summits)

Southwesterly, 15 to 20mph; strongest Snowdon range, where gusts locally 30mph.

Effect of wind on you?

Mostly fairly small.

How Wet?

Rain slowly edging southwards

Substantially or completely dry morning, and perhaps most of afternoon south of Bala to Barmouth. But patchy rain and drizzle, mainly westernmost mountains likely to extend slowly southwards through the day.

Cloud on the hills?

Increasingly developing from northwest

The hills widely cloud free at first, perhaps most of all day toward south. But from north gradually deteriorating, with cloud forming at 300 or 400m coastal hills and 500-700m well inland.

Chance of cloud free summits?

Dropping to less than 10% Snowdon range. 80% later 30% elsewhere

Sunshine and air clarity?

A little sunshine, mainly south of Bala to Barmouth morning before cloud fills in and thickens. Visibility excellent, but from north fog becoming widespread on particularly western hills.

How Cold? (at 900m)

8 or 9C

Freezing Level

Above the summits

Planning Outlook

All mountain areas of Britain from Wednesday 24th September 2014

A change to westerly winds across all mountain areas will bring a series of fronts, bringing bands of low cloud and rain, in from the west, particularly mid-week. Nevertheless, away from the W & NW Highlands of Scotland, total rainfall will be small. Blustery, with upland gales on Thursday and Friday across Highland Scotland. Next weekend and early next week is likely to become substantially dry again, particularly England and Wales. Many mountain areas are now, and will remain very dry underfoot.

In association with
Mountaineering Council of Scotland sportscotland Association of Mountaineering Instructions