Snowdonia National Park Forecast

The Snowdonia National Park.

Viewing Weather Forecast for Saturday 20th September 2014

Today | Sunday | Monday

Forecast last updated on Friday 19th September 2014 at 4:13pm

Summary for all mountain areas

Substantially dry for the Scottish Highlands; a few showers far north-west. Small amounts of showery rain from the Southern Uplands southwards. Low cloud shrouds many hills in the morning, but many summits across Scotland clearing. Much clearer air spreading from the north. Winds mostly light.

Headline for Snowdonia National Park

A little rain; persistent cloud on the hills.

How windy? (On the summits)

Northerly, 10 to 20mph, strongest Snowdon range in the afternoon.

Effect of wind on you?

Fairly small

How Wet?

Patchy rain

Patches of rain here and there; a few showery bursts possible, very remote chance of a thunderstorm.

Cloud on the hills?

Extensive, may persist north

Cloud extensive on higher areas in morning, locally forming from lower slopes upward. South from Porthmadog to Bala, cloud may slowly lift, but patches of cloud likely to persist Snowdon range and north of the A5 most or all day.

Chance of cloud free summits?

20% north; 40% by afternoon toward south.

Sunshine and air clarity?

Very little if any sun. Hazy, and widely foggy higher areas.

How Cold? (at 900m)

12C, tending to fall toward 9C during the day.

Freezing Level

Above the summits.

Planning Outlook

All mountain areas of Britain from Sunday 21st September 2014

Much clearer and cooler air will have spread across all mountain areas by Sunday. High pressure then brings a couple of dry and bright days on Sunday and Monday, with much improved visibility and most summits cloud free. A weak front approaches the far north-west late on Monday, then from Tuesday onwards, high pressure sinks southwards, allowing westerly winds to bring fronts in off the Atlantic. By Wednesday and Thursday, periods of rain become more frequent, and the risk of occasional upland gales.

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