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Updated: 1857 on Tue 2 Sep 2014
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Snowdonia: forecast weather

Tuesday, 2 September 2014: dawn to dusk

Printable view Forecast issued: 1715 on Tuesday, 2 September 2014

Overview for Wednesday

Another largely dry and fine day, once any early mist and hill fog clears, though cloudier than Tuesday. However, there will be some sunny spells.

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 Medium Occasional hill fog across eastern hills tonight, patchier in the west. Lifting during morning.
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight Medium Given the time of year, there will be a risk of sunburn in the sunny spells that develop.

key to hazards and forecast content

Weather summary and probability of precipitation for Wednesday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
rain
rain
Cloudy
Cloudy
Sunny intervals
Sunny intervals
Sunny intervals
Sunny intervals
10% 20% 10% 0%

Detailed mountain weather forecast: Snowdonia

Wednesday

Weather

Areas of low cloud will spread across the park overnight bringing occasional hill fog, mainly in the east. The low cloud may be thick enough for the odd drizzly outbreak. However, western hills may remain clearer. This low cloud and any mist patches through the valley floors will lift and break up through the morning with sunny spells developing, the best of sunshine will be in the west during the afternoon. It will feel warm in the sunshine with light winds.

Visibility

Generally good or very good below the cloud bases, and perhaps becoming excellent by afternoon. However, the visibility will be less than 100m where shrouded in the cloud.

Hill fog

Areas of low cloud will develop overnight, bringing occasional hill fog across eastern hills with bases down to 300m. In the west, the hill fog will be patchier. Through the morning, the low cloud will lift and break up with all summits becoming clear of cloud by the afternoon. Patchy hill of may reform across eastern upslopes by late evening.

Maximum winds above 500m

Southeast 15-20mph

Temperature

Valleys Plus 10 becoming 22 Celsius during the afternoon.
900 m Plus 11 Celsius
Freezing level Above the summits.

Thursday

Weather

Any mist and fog patches will soon clear through the morning to leave a bright day across the park with some sunshine, perhaps prolonged. With lights winds, it will feel warm in the sunshine, especially through sheltered valley floors. Thicker cloud may spread in from the east later in the evening.

Visibility

Generally very good or excellent with distant hills clearly discernible. However, the visibilities will be very poor in any early fog/hill fog.

Hill fog

Areas of low cloud and mist patches through the valley floors with develop overnight bringing occasional hill fog, mainly in the east. However, this will clear through the morning to leave all summits clear of cloud by afternoon.

Maximum winds above 500m

Southeasterly 10-15mph.

Temperature

Valleys Plus 10 becoming 22 Celsius
900 m Plus 11 Celsius
Freezing level Above the summits.

Outlook

Friday

A fairly cloudy start to the day. The cloud perhaps thick enough for the odd spot of light rain or drizzle. However, sunny spells are likely to develop through the day with hill fog clearing. A gentle easterly breeze. Freezing level well above the summits.

Saturday

Often large amounts of cloud on Saturday, chance of a little drizzle, but there will be some sunnier breaks at times. Moderate easterly winds. Freezing level well above the summits.

Sunday

Cloud and hill fog may well be more extensive on Sunday, especially in the morning, with some patchy rain and drizzle possible. The best of any bright or sunny breaks will be during the afternoon. Showery rain may spread up from the southwest later in the day. Moderate to occasionally fresh easterly winds.

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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