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Updated: 1005 on Tue 19 Mar 2013
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Snowdonia: latest visual satellite

Thursday, 21 August 2014: dawn to dusk

Printable view Forecast issued: 1438 on Thursday, 21 August 2014

Overview for Friday

Cloud will lift and break in the morning to leave a mainly dry day with sunny spells and isolated showers.

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 High Extensive towards the north and west at first, as low as 500m. Lifting through the morning.
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight Medium Moderate to high UV levels in sunny spells.

key to hazards and forecast content

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

Detailed mountain weather forecast: Snowdonia

Friday

Weather

Cloudy, particularly for northern and western slopes, at first, but the cloud will lift and break through the morning to leave a mainly dry day with sunny spells and isolated showers. The showers will possibly he heavy at times, but will become less frequent through the afternoon. It will be cool in a northwesterly breeze, but will still be pleasant when walking on sheltered southern slopes in the sun.

Visibility

Generally excellent, moderate in showers, very poor in early hill fog.

Hill fog

Extensive as low as 500m at first, but lifting and breaking above the peaks through the morning.

Maximum winds above 500m

North to northwesterly 20-25mph.

Temperature

Valleys Plus 8 Celsius becoming plus 16 Celsius.
900 m Plus 5 Celsius becoming plus 7 Celsius.
Freezing level Above the summits.

Saturday

Weather

A generally dry and bright day with plenty of sunny spells and isolated showers. Showers will mainly affect north facing slopes and could be heavy at times. Winds will remain fresh north to northwesterly and it will be cool in the breeze.

Visibility

Generally excellent, moderate in showers.

Hill fog

Cloud remaining above the peaks.

Maximum winds above 500m

Northwesterly 15-20mph.

Temperature

Valleys Plus 7 Celsius becoming plus 16 Celsius.
900 m Plus 5 Celsius becoming plus 8 Celsius.
Freezing level Above the summits.

Outlook

Sunday

A generally dry and bright day with plenty of long sunny spells. An isolated shower could not be ruled out, but most places will remain dry. It will be cool in a northwesterly breeze, but be pleasant when walking in the sheltered sun. Cloud will build form the west later.

Monday

Rain, heavy at times, and low cloud/hill fog will affect the range for most of the day. It will gradually clear later with scattered showers following.

Tuesday

Mainly dry with some bright spells, but showers at times too. Temperatures retuning to near normal for the time of year as winds become southwesterly.

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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