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Updated: 1132 on Wed 20 Aug 2014
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Brecon Beacons: latest temperature

Wednesday, 20 August 2014: dawn to dusk

Printable view Forecast issued: 0359 on Wednesday, 20 August 2014

Overview for Wednesday

After a showery start to the day with patchy hill fog, conditions will brighten up with sunny spells developing and showers becoming few and far between later in the afternoon. Feeling cold at height.

Hazards Risk Explanation
Blizzards No Risk  
Heavy snow No Risk  
Storm force winds No Risk  
Gales No Risk  
Severe chill effect Medium Unseasonably cold for August with temperatures feeling closer 1 or 2C over the summits.
Persistent and extensive hill fog Medium Occasional hill fog above 500-700m overnight, mainly west, breaking up through the morning.
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight Medium Medium risk of high UV levels at times during 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
Light rain showers
Light rain showers
Light rain showers
Light rain showers
Sunny intervals
Sunny intervals
Sunny intervals
Sunny intervals
50% 40% 30% 20%

Detailed mountain weather forecast: Brecon Beacons

Wednesday

Weather

A chilly start but sunny spells and a few showers are likely through the morning. However, the showers will become even more isolated, and eventually clear, through the afternoon with sunshine developing more widely. A dry evening will follow with temperatures falling markedly after dusk.

Visibility

Very good or excellent outside the showers will distant hills clearing discernible. However, visibilities will be moderate to poor in the showers, especially early in the morning, and very poor where shrouded in the cloud.

Hill fog

Occasional hill fog above 500-700m overnight and through the early morning period, mainly in the west. These patches will lift and break up through the morning with only occasional ragged fragments left on the highest peaks around showers during the afternoon.

Maximum winds above 400m

Northwesterly 15-20mph.

Temperature

Valleys Plus 4 becoming 18 Celsius
800 m Plus 5 becoming 7 Celsius
Freezing level Above the highest summits.

Thursday

Weather

After a chilly dawn, there will be sunny spells through the morning and into the early part of the afternoon. However, thicker cloud will gradually push down from the northwest during the afternoon perhaps bringing some showery rain to the park, this may be heavy at times. Feeling chilly in the wind.

Visibility

Generally very good, but deteriorating to moderate to poor in the showery rain later and very poor where shrouded in the cloud.

Hill fog

Occasional above 500-700m overnight, lifting through the morning with many summits likely to clear for a time. However, later in the afternoon and into the evening, areas of cloud are likely to form across the hills; especially in the west .

Maximum winds above 400m

Northwesterly 10-15mph, becoming westerly 20-30mph by midday.

Temperature

Valleys Plus 4 becoming 18 Celsius
800 m Plus 6 Celsius
Freezing level Above the summits.

Outlook

Friday

After a rather cloudy morning with extensive hill fog and showery rain, conditions will improve from the north with sunny spells developing and cloud bases rising off the summits into the afternoon. However, a few showers will likely develop, perhaps heavy with a risk of thunder. Feeling cold at height with a marked wind chill making it feel closer to zero over the summits.

Saturday

After a cold start to the day with grass frost likely in the valleys, a largely fine day will follow with some lengthy sunny periods. Isolated showers are possible, particularly at first, though many places should stay dry. Feeling chilly at height in the moderate to fresh northwesterly breeze.

Sunday

After a cold and fairly clear start to the day, conditions will deteriorate from the southwest through the day with cloud and rain spreading across the park. This rain will be persistent and often heavy and accompanied by near upland southerly gales.

Neuadd Rain (near Pontsticill)

Altitude 353 metres

Rainfall measured at 03:00 Wednesday, 20 August 2014

  • Last 24 hours 0.0 mm
  • Last 48 hours 0.6 mm
  • Last 72 hours 3.2 mm

Rainfall data provided by the Environment Agency. The Met Office is not responsible for content provided by third parties and may remove this data without warning.

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Weather warnings for Wales

Weather forecast for Wales

The Enhanced Mountain forecast for Brecon Beacons 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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