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Updated: 1521 on Wed 18 Jun 2014
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Zoom map SW Scotland, Lothian Borders North West England North East England Yorkshire & Humber Wales East Midlands West Midlands East of England London & South East England South West England Northern Ireland Central, Tayside & Fife Grampian Highlands & Eilean Siar Orkney & Shetland Strathclyde

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Snowdonia: latest pressure

Friday, 22 August 2014: dawn to dusk

Printable view Forecast issued: 1436 on Friday, 22 August 2014

Overview for Saturday

Sunshine and isolated showers throughout the day.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds No Risk  
Gales No Risk  
Severe chill effect No Risk  
Persistent and extensive hill fog No Risk  
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight High Long sunny spells with moderate to high UV levels.

key to hazards and forecast content

Weather summary and probability of precipitation for Saturday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
rain
rain
rain
rain
Sunny intervals
Sunny intervals
Sunny intervals
Sunny intervals
20% 20% 10% 10%

Detailed mountain weather forecast: Snowdonia

Saturday

Weather

Isolated showers for coastal areas and clear spells through the early hours will lead to a chilly start to the day. It will then be a mainly dry day with plenty of sunny spells and the odd isolated shower, mainly for northern coastal slopes. It will feel pleasant when walking on southern sheltered slopes in the sun. There will be a fresh northwesterly breeze.

Visibility

Generally excellent, moderate in showers.

Hill fog

Cloud bases remaining above the summits.

Maximum winds above 500m

Northwesterly 20-25mph.

Temperature

Valleys Plus 6 Celsius becoming plus 16 Celsius.
900 m Plus 5 Celsius becoming plus 8 Celsius.
Freezing level Above the summits, though frost possible in valleys at first.

Sunday

Weather

A dry, bright and cold start but cloud will increase from the west through the morning and winds will become southwestery and increase. Rain, possibly heavy at times, will reach the range by the evening bringing cloud bases as low as 400m into the evening.

Visibility

Excellent at first, moderate in rain, poor in heavy rain, very poor in hill fog.

Hill fog

Nil for most of the day, becoming extensive at 400m over southern and western slopes through the evening.

Maximum winds above 500m

Northwesterly 15-20mph, backing southwesterly 20-25mph later.

Temperature

Valleys Plus 5 Celsius becoming plus 15 Celsius.
900 m Plus 5 Celsius becoming plus 8 Celsius.
Freezing level Above the summits, though frost possible in valleys at first.

Outlook

Monday

A wet and windy Bank Holiday Monday over the range. Rain will be heavy at times with winds fresh to strong throughout. Rain will tend to ease later in the day.

Tuesday

Rain will clear to the south through the day, but timings are unclear at this stage. Mainly dry conditions with isolated showers will follow and winds tending to ease.

Wednesday

A generally dry and bright start to the day, but cloud will build through the day with rain arriving later. Again timings for the arrival of the rain are unclear at this stage.

Observations

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Weather warnings for Wales

Weather forecast for Wales

The Enhanced Mountain forecast for Snowdonia has been discontinued. All forecast information for these locations can be found in the standard Mountain forecast above.

North East England West Midlands Grampian South West England Central, Tayside & Fife Northern Ireland North West England East of England Highlands & Eilean Siar Strathclyde Wales East Midlands SW Scotland, Lothian Borders London & South East England Yorkshire & Humber

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