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Updated: 0857 on Sun 31 Aug 2014
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Snowdonia: forecast weather

Sunday, 31 August 2014: dawn to dusk

Printable view Forecast issued: 0359 on Sunday, 31 August 2014

Overview for Sunday

Rather cloudy through the early hours with outbreaks of rain possible, then a dry day with some sunny spells developing. Some rain possible later.

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 Persistent down to 400m through the early hours, and again through the evening.
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight Medium With moderate UV levels there is a risk of sunburn in sunny spells.

key to hazards and forecast content

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

Detailed mountain weather forecast: Snowdonia

Sunday

Weather

Rain will quickly ease, and through the morning the cloud will lift and break to leave a dry day with some warm sunny spells. Through the afternoon cloud will gradually lower and thicken from the west, with patchy rain and drizzle along with extensive hill fog moving in later in the evening and overnight.

Visibility

Generally good, but moderate to poor in outbreaks of rain and very poor in hill fog.

Hill fog

Becoming less extensive with bases rising to perhaps 700-800m during the morning, but soon lowering and becoming widespread across the park. By evening, most hills above 300-400m will be shrouded in persistent hill fog making navigation difficult.

Maximum winds above 500m

Northwesterly 30mph, backing Southwesterly 30-35 gusts 45pmh later

Temperature

Valleys Plus 11 Celsius rising Plus 18 Celsius
900 m Plus 9 Celsius
Freezing level Above the summits

Monday

Weather

It will be cloudy through much of the morning with outbreaks of rain and extensive hill fog. Late in the morning, rain will gradually ease and cloud will lift and breaks, to leave a mainly dry afternoon with some bright or sunny spells.

Visibility

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

Hill fog

Extensive down to 400 metres through the morning, locally down to 100 metres on western facing slopes, severely affecting navigation. Through the morning, cloud will gradually lift and break, with just isolated patches down to 800 metres through the afternoon.

Maximum winds above 500m

Northwesterly 30mph

Temperature

Valleys Plus 9 Celsius rising Plus 18 Celsius
900 m Plus 9 Celsius
Freezing level Above the summits.

Outlook

Tuesday

Probably dry on Tuesday, but with large uncertainties regarding cloud amounts. Some bright or sunny periods are likely and these may well be most prolonged in western areas of the park. Light to moderate easterly or southeasterly winds developing.

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.

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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