Snowdonia National Park Forecast

The Snowdonia National Park.

Viewing Weather Forecast for Wednesday 27th May 2015
Forecast last updated on Tuesday 26th May 2015 at 4:15pm

Today | Thursday | Friday

Summary for all mountain areas

Continuing chilly for late May. Generally deteriorating from the west as drizzly showers merge into almost constant rain for some areas, and cloud, covering many higher areas most or all day, lowers further. Windy northern Scotland and in the evening near the Irish Sea.

Headline for Snowdonia National Park

Deteriorating: Increasingly windy and wet; lowering cloud.

How windy? (On the summits)

Southwesterly, 20mph, strengthening to 35 perhaps 40mph higher tops from west during afternoon or early evening.

Effect of wind on you?

Will in afternoon increasingly make walking difficult on higher areas. Wind chill becoming significant.

How Wet?

Increasingly wet from about midday

Substantially dry until midday or perhaps into the afternoon well inland; when bursts of rain will increasingly develop, especially western hills.

Cloud on the hills?

Becoming very extensive

Widespread cloud; bases 550m although may lift to 850m or above the summits, for a few hours,. As rain develops in afternoon, so cloud base will slowly drop, gradually forming on lower slopes western hills, and by evening 500m east.

Chance of cloud free summits?

20% dropping to less than 10%

Sunshine and air clarity?

Glimpses of sun, mostly eastern hills in morning. Slight haze; fog often on higher tops; extensive later in day.

How Cold? (at 900m)

2C rising to 4 or 5C well inland.

Freezing Level

Above the summits

Planning Outlook

All mountain areas of Britain from Thursday 28th May 2015

Frequently cold over the next week, with precipitation at some stage on most mountain areas more or less daily. Often this will be as heavy showers, with hail and mainly on the Scottish Highlands, snow on higher areas. There will also be thunder. As the cold weather continues, mainly on the Scottish Highlands, there remains considerable snow cover, this blocking access to some routes. There are strong indications of a reversal in weather pattern around the middle of next week, with pressure building in the vicinity of Britain, to bring fine, and later in the week warm weather.

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