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Brecon Beacons - Mountain weather forecast

Weather warnings

Warnings affecting Brecon Beacons over the next 5 days


High confidence at first for warm, bright and rather muggy conditions and also for a breakdown to more showery conditions through Tuesday, but Medium for shower distribution and then Low confidence for developments from Thursday.

  • Sunday
  • Monday
  • Further outlook

Sunday 22 July 2018

Weather hazards

Strong sunlight High likelihood Hide 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

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


Patchy mist and fog clearing in the morning then dry and bright with sunshine, and very warm.


06:00 09:00 12:00 15:00 18:00 21:00
Weather at 600m Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny day Clear night
Chance of precipitation at 600m 00% 00% 00% 00% 00% 00%

Wind speed and direction

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m NW 7 11 NW 7 9 NW 7 10 NW 8 12 W 8 12 W 5 9
300m W 4 8 W 4 6 W 5 9 NW 6 10 W 7 13 SW 4 9
Valley W 5 9 W 4 6 W 5 10 W 5 11 W 7 13 W 4 10


06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m 13 ° 15 ° 18 ° 19 ° 18 ° 17 °
300m 14 ° 18 ° 21 ° 23 ° 21 ° 18 °
Valley 15 ° 19 ° 22 ° 23 ° 22 ° 19 °

Feels like temperature

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m 12 ° 14 ° 17 ° 19 ° 18 ° 17 °
300m 14 ° 18 ° 21 ° 23 ° 21 ° 19 °
Valley 14 ° 19 ° 22 ° 24 ° 22 ° 19 °

Freezing level

06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 3,900 m 3,600 m 3,600 m 3,600 m 3,600 m 3,500 m
Sunrise: 05:21
Sunset: 21:19
Moon phase: First quarter


Variable amounts of high cloud at first with patchy mist and fog. This will quickly clear, then a mainly dry, bright or sunny day, but rather hazy. Some sunny spells are expected particularly late morning and in the early afternoon, and very warm too.

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

80% overnight with mainly high cloud, but 40% in the morning with hill fog over the peaks but also at lower levels for a time as fog lifts. Chance improving to around 80% by lunchtime with generally patchy cloud over the summits.


Moderate to good with distant hills not easy to make out, although poor or very poor for a time in places for a few hours after dawn

Meteorologist's view

Feeling very warm on the slopes, while some valleys reaching 27 Celsius. Also feeling rather moist and muggy and difficult to stay cool, so risk of heat exhaustion with strenuous walking in very warm conditions.

Recent rainfall

  • Location: Neuadd (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 03:00 on Sun 22 Jul 2018
  • Last 24 hours: 0.4mm
  • Last 48 hours: 2.6mm
  • Last 72 hours: 2.6mm

Rainfall data provided by Natural Resources Wales. The Met Office is not responsible for content provided by third parties and may remove this data without warning.

Monday 23 July 2018

Sunrise: 05:22
Sunset: 21:18
Moon phase: Waxing gibbous


Mist and fog re-forming overnight and rather slow to clear in the morning, but sunny intervals will gradually develop. Some showers will break out in the afternoon, butt fading away in the evening as low cloud develops to bring some patchy drizzle to western slopes later..

Maximum wind speed expected

Southwesterly 10mph, possibly 15 to 20 mph on higher slopes

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

Around 20% at first, though higher slopes likely to be cloud/fog free. Improving to 60% through the morning as fog and low cloud lifts with occasionally broken cloud over the higher tops, but lower at times in afternoon showers. Chance decreasing again through the evening as low cloud develops.


  • At 600m Plus 12 Celsius rising to plus 17 Celsius by day
  • Valley Plus 13 Celsius rising to plus 23 Celsius
  • Freezing level Well above the tops


Poor or very poor quite widely at first, but improving to becoming mostly good by the afternoon, though some reductions with showers and falling moderate to poor in places in the evening.

Tuesday 24 July 2018

Sunrise: 05:24
Sunset: 21:16
Moon phase: Waxing gibbous

Rather a lot of low cloud around at first with patchy drizzle, but this will gradually lift in the morning, then a band of showery rain is expected to cross in the afternoon, followed by sunny intervals and a fresher feel, though staying fairly cloudy.

Wednesday 25 July 2018

Sunrise: 05:25
Sunset: 21:15
Moon phase: Waxing gibbous

Rather cloudy but some sunny spells, though also a few showers. Light and variable winds.

Thursday 26 July 2018

Sunrise: 05:26
Sunset: 21:13
Moon phase: Waxing gibbous

A bright start with some hazy sunshine, though possibly some early mist or fog. Cloud increasing through the afternoon to bring some rain by evening along with fresher southerly winds

Issued at:
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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.

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