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Brecon Beacons - Mountain weather forecast

Weather warnings

Warnings affecting Brecon Beacons over the next 5 days


High for changeable/showery conditions. Lower for timing and extent of rain on Friday and Saturday evening.

  • This evening
  • Friday
  • Saturday
  • Further outlook

Thursday 27 July 2017

Sunset: 21:12
Moon phase: Waxing crescent

Bright spells before dusk with showers tending to ease.

Friday 28 July 2017

Weather hazards

Heavy persistent rain Medium likelihood Hide detail

Prolonged exposure to heavy rain can result in drenched clothing and a risk of hypothermia if not wearing good quality waterproofs. Terrain may turn increasingly boggy underfoot, while mountain streams will rapidly rise into spate and may become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.

Learn more about heavy persistent rain

Severe chill effect Low likelihood Show detail

Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.

Learn more about severe chill effect

Poor visibility Low likelihood Show detail

Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.

Learn more about poor visibility

Strong sunlight Low likelihood Show detail

Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.

Learn more about strong sunlight


Breezy with sunny spells to start but clouding over with rain later.


00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 600m Cloudy Partly cloudy night Partly cloudy night Sunny intervals Cloudy Heavy rain Heavy rain Heavy rain
Chance of precipitation at 600m 30% 10% 10% 10% 30% 60% 90% 80%

Wind speed and direction

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m SW 24 33 SW 25 34 W 26 35 SW 25 35 SW 25 35 SW 27 38 SW 29 40 SW 26 36
300m SW 13 29 SW 14 31 SW 14 30 SW 15 32 SW 15 31 SW 15 33 SW 16 35 SW 15 31
Valley SW 13 29 SW 13 29 W 13 29 SW 14 30 SW 13 29 SW 13 30 SW 15 34 SW 14 30


00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m 10 ° 10 ° 10 ° 12 ° 13 ° 12 ° 12 ° 13 °
300m 12 ° 12 ° 12 ° 14 ° 15 ° 14 ° 14 ° 15 °
Valley 13 ° 13 ° 13 ° 15 ° 16 ° 15 ° 15 ° 15 °

Feels like temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m 6 ° 5 ° 6 ° 8 ° 9 ° 8 ° 8 ° 9 °
300m 10 ° 9 ° 10 ° 12 ° 12 ° 12 ° 12 ° 12 °
Valley 11 ° 10 ° 11 ° 13 ° 13 ° 13 ° 12 ° 13 °

Freezing level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 2,000 m 1,900 m 1,900 m 2,300 m 2,800 m 3,100 m 3,000 m 2,900 m
Sunrise: 05:29
Sunset: 21:10
Moon phase: Waxing crescent


Clear spells overnight with just the odd passing shower. The best of any sunshine will be through the morning with cloud amounts increasing through the afternoon bringing outbreaks of rain. Rain could be heavy at times during the late afternoon and evening before clearing before midnight.

Chance of cloud-free mountain/hill tops at 600m

80-90% during the morning, falling to 20% as rain sets in.


Good or very good falling to moderate in rain.

Meteorologist's view

Gusty winds will make it feel cool over the summits.

Recent rainfall

  • Location: Neuadd Rain (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 15:00 on Thu 27 Jul 2017
  • Last 24 hours: 5.8mm
  • Last 48 hours: 16.2mm
  • Last 72 hours: 16.4mm

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.

Saturday 29 July 2017

Sunrise: 05:31
Sunset: 21:09
Moon phase: Waxing crescent


Fine and dry overnight. Sunny spells through the day with just a few mainly light showers developing. Cloud amounts increasing later but rain is expected to remain east of the Brecons.


  • At 600m 13C
  • Valley 9C rising to 17C
  • Freezing level Above the summits.


Generally good or very good.

Chance of cloud-free mountain/hill tops at 600m

80-90% for most of the day.

Maximum wind speed expected

Southwest 15mph gusting 25mph.

Sunday 30 July 2017

Sunrise: 05:32
Sunset: 21:07
Moon phase: First quarter

Rather cloudy and windy with the best of any sunny intervals during the morning. Scattered showers are expected for much of the day and could be heavy and thundery during the afternoon. Feeling cool with fresh to strong southwesterly winds.

Monday 31 July 2017

Sunrise: 05:34
Sunset: 21:06
Moon phase: First quarter

Another day of sunny spells and showers although these should tend to be lighter and less frequent than on Sunday. Moderate to fresh southwesterly winds.

Tuesday 1 August 2017

Sunrise: 05:35
Sunset: 21:04
Moon phase: First quarter

Mainly dry with sunny spells and just a chance of the odd shower at times. Light to moderate southwesterly winds. Feeling a little warmer than previous days.

Issued at:

The Brecon Beacons is a mountain range in South Wales comprising six main peaks, with the highest peak, Pen y Fan, standing at 886 metres.

The summits of each peak form a long ridge with four of the peaks forming a horseshoe shape around the head of the Taf Fechan River which flows away to the south-east. The Brecon Beacons is said to be named after the ancient practice of lighting signal fires (beacons) on mountains to warn of attacks by invaders, or more recently to commemorate public and national events such as coronations or the Millennium.

For ardent mountain climbers, the Brecon Beacons National Park is among the best that Britain has to offer. While it doesn't have some of the headline-grabbing peaks of Snowdonia or the Scottish Highlands, it fits scores of slightly smaller mountains into its relatively compact 519 square mile area. These include the area's highest peak, Pen y Fan, as well as the marginally smaller Corn Du (873 metres). Both offer rather hospitable, anvil-shaped summits to those who reach the top, with plenty of space for rest and photographs, before tackling the descent.