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Updated: 1005 on Tue 19 Mar 2013
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Snowdonia: latest infra-red satellite

Monday, 1 September 2014: dawn to dusk

Printable view Forecast issued: 0444 on Monday, 1 September 2014

Overview for Monday

Cloudy through much of the morning with outbreaks of rain and hill fog. Clearer conditions spreading in later on.

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 down to 400 metres through the morning.
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight Low With moderate UV levels there is a risk of sunburn in sunny spells later in the afternoon

key to hazards and forecast content

Weather summary and probability of precipitation for Monday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Cloudy
Cloudy
Cloudy
Cloudy
Sunny intervals
Sunny intervals
Sunny intervals
Sunny intervals
40% 20% 10% 0%

Detailed mountain weather forecast: Snowdonia

Monday

Weather

It will be cloudy through much of the morning, with outbreaks of rain or drizzle and extensive hill fog. Late in the morning and into the afternoon, conditions will gradually improve from the northwest, with rain easing and cloud lifting, allowing some bright or sunny spells to develop during the afternoon.

Visibility

Moderate or poor at first in the rain, and very poor in the hill fog, becoming generally good during the afternoon.

Hill fog

Extensive down to 400 metres through the morning, locally down to 100 metres on western facing upslopes through the early hours. Cloud will gradually lift and break through the morning, with isolated patches over the summits through the afternoon.

Maximum winds above 500m

Southwesterly 35mph

Temperature

Valleys Plus 11 Celsius rising Plus 19 Celsius
900 m Plus 9 Celsius
Freezing level Above the summits

Tuesday

Weather

Dry with clear spells overnight. It is likely to remain dry throughout the day, although perhaps rather cloudy at times. The best of any breaks in the cloud and the best of the sunshine is likely to be in the west of the park.

Visibility

Generally very good, but very poor in any hill fog.

Hill fog

Isolated patches over the summits.

Maximum winds above 500m

Northeasterly 15mph

Temperature

Valleys Plus 9 Celsius rising Plus 21 Celsius
900 m Plus 8 Celsius
Freezing level Above the summits.

Outlook

Wednesday

Any early mist or fog patches should quickly clear to leave a dry and fine day with a good deal of sunshine, particularly first thing. During the day, the cloud may well build, however this should stay largely above the summits. Winds are likely to be light and variable.

Thursday

It will be another mainly dry day, with variable amount of cloud and bright or sunny spells developing after any early mist or fog patches lift. Winds will remain light and variable.

Friday

The settled weather looks set to continue initially on Friday, with bright or sunny spells and variable amounts of cloud. Through the day, cloud may thicken from the west, perhaps with some rain later. Winds will be light and variable.

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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