Snowdonia National Park

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

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Viewing Forecast For

Snowdonia National Park
Saturday 19th June 2021
Last updated Fri 18th Jun 21 at 7:13PM

Summary for all mountain areas

After a chilly start, a fine day will follow with a patchwork of sunshine. Chance of a few bursts of rain here and there, mainly inland in the afternoon. High cloud bases with hills extensively clear, although some banks of hill fog at first; particularly SE Highlands.

Headline for Snowdonia National Park

Early cloud banks clearing. Then fine with hazy sun. Increasingly blustery.

How windy? (On the summits)

Southerly typically 15mph at first, although will increase during day to 20 to 25mph, particularly western summits where perhaps 30mph by evening

Effect of the wind on you?

Mostly small, but there may be some buffeting western mountains later in day - affecting both higher & lower slopes.

How Wet?

Little or no rain

Chance of a few bursts of rain; likely to amount to very little.

Cloud on the hills?

Very little

Summits extensively or completely cloud free. However some early banks possible for a few hours after dawn, mainly across the eastern areas.

Chance of cloud free summits?

80%

Sunshine and air clarity?

Extensive sunshine overall, although areas of high, mostly thin cloud. Hazy although overall good visibility.

How Cold? (at 900m)

11C.

Freezing Level

Above the summits.

Viewing Forecast For

Snowdonia National Park
Sunday 20th June 2021
Last updated Fri 18th Jun 21 at 7:13PM

How windy? (On the summits)

Low confidence in forecast: Easterly 25-40mph, risk 50mph for a few hours early in the day.

Effect of the wind on you?

Walking arduous, or on higher tops difficult, at times through the day.

How Wet?

Pulses of rain, perhaps much of day.

Areas of rain will edge across the area to give frequent rainfall through day. Some heavy and perhaps thundery pulses and becoming more widely showery later.

Cloud on the hills?

Extensive

Very likely cloud shrouding the hills in fog extensive for much of the day. Bases generally around 500-800m, perhaps briefly as high as 900m in the west.

Chance of cloud free summits?

20%

Sunshine and air clarity?

Little or no sun. Visibility often poor due to rain, and otherwise fairly hazy.

How Cold? (at 900m)

7 to 9C

Freezing Level

Above the summits.

Viewing Forecast For

Snowdonia National Park
Monday 21st June 2021
Last updated Fri 18th Jun 21 at 7:13PM

How windy? (On the summits)

Low confidence in detail: Northeasterly 15 to 25mph, risk 30mph tops for a time.

Effect of the wind on you?

Blustery, will impede walking at times across higher tops with marked chill.

How Wet?

Scattered showers

A scattering of showers developing from mid morning onwards. Perhaps some locally heavy ones by afternoon.

Cloud on the hills?

Early banks higher tops, clearing.

Early banks of cloud covering higher tops, may persist much of morning Snowdon Range. However, by afternoon, hills mostly clear, bar some ragged patches tops.

Chance of cloud free summits?

70%

Sunshine and air clarity?

Fairly cloudy start, but patchy sun soon breaking through. Visibility mostly very good.

How Cold? (at 900m)

5C lifting to 7C

Freezing Level

Above the summits.

Planning Outlook

Fairly chilly pattern early next week, but mostly fine with hills often clear as a ridge of high pressure dominates. However from midweek onwards, whilst turning warmer, it will become more changeable with the risk of pulses of showery rain from time to time as pressure gradually lowers from the west. However, there will still be some dry and fine periods; these conditions perhaps predominating still across eastern areas where broadly any rainfall amounts will be small.