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
Thursday 24th June 2021
Last updated Wed 23rd Jun 21 at 4:35PM

Summary for all mountain areas

A damp atmosphere shrouds most west coastal hills in fog to lower slopes in morning. Some breaks forming for England, Wales & eastern Scotland. Rain heavier in middle of the day in western Scotland, spreading later to NW England and N Wales.

Headline for Snowdonia National Park

A little rain or drizzle; coastal hills may stay shrouded.

How windy? (On the summits)

North turning northwest later westerly, 10 to 20mph, sometimes less in morning, bu tending to strengthen in afternoon to 20-25mph, perhaps 30mph higher mountains into the evening.

Effect of the wind on you?

Fairly small morning, but increasing amounts of buffeting on higher summits as the day progresses.

How Wet?

A little rain or drizzle, wet by dusk

Pockets of drizzle mainly coastal hills in the morning. The odd shower possible elsewhere. By evening, increasing risk of steadier rain moving in from west.

Cloud on the hills?

Lowest and most persistent near coast

Toward the coast, hills from lower slopes up foggy most or all day. Progressively inland, the cloud base will rise and some breaks toward higher slopes.

Chance of cloud free summits?

30%

Sunshine and air clarity?

Occasional sun, although Snowdon range dull and misty most of the day. Hills furthest east may see very good visibility.

How Cold? (at 900m)

12C, rising marginally middle of day; dropping a degree or so into evening, then overnight falling toward 5C.

Freezing Level

Above the summits.

Viewing Forecast For

Snowdonia National Park
Friday 25th June 2021
Last updated Wed 23rd Jun 21 at 4:35PM

How windy? (On the summits)

Southwesterly 15 to 25mph, becoming variable, speeds may fall light later in day.

Effect of the wind on you?

Some buffeting on exposed higher terrain, may tend to ease.

How Wet?

Rain or thundery showers

Some uncertainty: Rain arriving in the early hours likely to persist well into the daytime, risk of steady heavy falls for many hours. May gradually break up, only to be replaced by slow-moving heavy showers, risk thunder.

Cloud on the hills?

Extensive

Blanket low cloud likely to shroud the mountains throughout the day, to lowest slopes near Irish Sea. Some breaks may occur above 500-600m in east Wales if rain fades away for sustained periods.

Chance of cloud free summits?

10%

Sunshine and air clarity?

Generally cloudy, very murky around rain. Occasional improvements.

How Cold? (at 900m)

7 to 10C, coolest toward evening.

Freezing Level

Above the summits.

Viewing Forecast For

Snowdonia National Park
Saturday 26th June 2021
Last updated Wed 23rd Jun 21 at 4:35PM

How windy? (On the summits)

Easterly 15 to 25mph.

Effect of the wind on you?

Fairly small, but locally blustery and gusty through passes to some lower slopes.

How Wet?

Drizzly rain may linger

Areas of drizzle or light rain may come and go through the day, particularly east and mid-Wales. Hills toward the west may see very little.

Cloud on the hills?

May persist higher slopes

Risk of extensive low cloud across the hills in the morning, to some lower slopes. Gradually cloud bases will lift away from rain, with breaks forming to 600-800m, best near west coast, but higher tops may struggle to clear.

Chance of cloud free summits?

40%

Sunshine and air clarity?

Mostly cloudy, dull for periods, but visibility very good away from rain.

How Cold? (at 900m)

9C rising to 12C.

Freezing Level

Above the summits

Planning Outlook

Low pressure drifts slowly southwards across Britain through Friday into the weekend, followed by improving conditions from the north as pressure builds. Residual areas of rain, drizzle and low cloud may affect Wales, the Pennines and perhaps eastern Scotland through the weekend, whilst west & northwest Scotland become fine and increasingly warm. Most indications favour high pressure influencing Britain into next week, bringing mainly dry and warm weather. Despite some rain this week, most mountain areas will remain very dry underfoot: beware of the risk of fire.