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RainfallPressureCloud amount forecastWarnings
Weather mapWindTemperatureUV
Forecast
 Fri   Sat   Sun   Mon   Tue 
Daytime Fri 29 Aug 2014 Daytime Sat 30 Aug 2014 Daytime Sun 31 Aug 2014 Daytime Mon  1 Sep 2014 Daytime Tue  2 Sep 2014
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Updated: 0523 on Fri 29 Aug 2014
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Brecon Beacons: forecast uv

Friday, 29 August 2014: dawn to dusk

Printable view Forecast issued: 1752 on Friday, 29 August 2014

Overview for Saturday

Cloudy with extensive hill fog overnight and a few spots of rain or drizzle. Becoming mostly dry and bright through the morning with sunny spells developing and just the odd isolated shower.

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 Hill fog may well be fairly widespread and quite persistent above 600-700m during the morning.
Thunderstorms No Risk  
Heavy persistent rain No Risk  
Strong Sunlight Medium Sunny periods may become quite prolonged during the afternoon giving a risk of sunburn.

key to hazards and forecast content

Weather summary and probability of precipitation for Saturday
Dawn to 0900 0900 to 1200 1200 to 1500 1500 to dusk
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Cloudy
Sunny intervals
Sunny intervals
30-50% 30-50% 30% 30%

Detailed mountain weather forecast: Brecon Beacons

Saturday

Weather

It will be generally cloudy through the early hours with the odd spot of rain or drizzle and increasing amounts of hill fog. Staying largely cloudy at first on Saturday morning, but brightening up with sunny periods during the afternoon with just the odd isolated shower. Largely dry through the evening with clear periods. Winds easing but remaining breezy over exposed ridges and summits.

Visibility

Generally good, but poor in any drizzle, especially during the morning. Very poor in hill fog.

Hill fog

Occasional hill fog developing above 600-700m through the early hours and this becoming more extensive by dawn. During the morning the hill fog should become largely patchy in nature and mostly over the highest summits.

Maximum winds above 400m

35-40mph gusting 45-50mph over the highest summits during the early hours. Easing by dawn to 25-30mph gusting 35-40mph and remaining similar throughout Saturday.

Temperature

Valleys 13 degrees Celsius, rising to 19 degrees Celsius.
800 m Plus 10 Celsius
Freezing level Well above the summits.

Sunday

Weather

Mostly dry and cloudy during the overnight period, although the cloud may be thick enough to give the odd showery outbreak. Mainly dry conditions continuing through the morning with some bright periods. Thickening cloud developing later in the day with an increasing risk of patchy rain and drizzle during the evening along with widespread and persistent hill fog.

Visibility

Generally good but poor in rain and drizzle during the evening. Very poor in hill fog.

Hill fog

Occasional patches above 700m mostly around the middle of the day. By late-afternoon/evening, most hills above 500-600m will be shrouded in persistent hill fog making navigation difficult.

Maximum winds above 400m

15-20mph with occasional gusts 25-30mph for most of the day, but increasing to 25mph gusting 30-35mph later in the day.

Temperature

Valleys 11 degrees Celsius, rising to 18 degrees Celsius.
800 m Plus 9 Celsius
Freezing level Well above the summits.

Outlook

Monday

It will probably be a cloudy morning with a risk of some occasional rain and drizzle. Through the day, it is likely to become generally dry with some sunshine developing during the afternoon. Light to moderate westerly or northwesterly winds.

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.

Neuadd Rain (near Pontsticill)

Altitude 353 metres

Rainfall measured at 15:00 Friday, 29 August 2014

  • Last 24 hours 8.6 mm
  • Last 48 hours 13.6 mm
  • Last 72 hours 14.0 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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