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Brecon Beacons - Mountain weather forecast

Weather warnings

Warnings affecting Brecon Beacons over the next 5 days

Confidence

High becoming Medium from Tuesday

  • This evening
  • Sunday
  • Monday
  • Further outlook

Saturday 15 December 2018

Sunset: 16:03
Moon phase: First quarter

Rain clearing showers. Severe gale or storm force winds at first

Sunday 16 December 2018

Weather hazards

Heavy persistent rain Medium likelihood Hide detail

Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and 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

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

Headline

A bright morning, but outbreaks of heavy rain in the afternoon and evening.

Weather

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 600m Light shower night Light shower night Partly cloudy night Sunny intervals Cloudy Heavy rain Heavy rain Partly cloudy night
Chance of precipitation at 600m 70% 50% 30% 20% 30% 70% 70% 30%

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 W 25 34 SW 21 29 SW 18 26 S 17 23 S 20 26 S 21 28 SW 16 22 W 19 27
300m SW 13 30 SW 12 27 SW 10 24 S 8 20 S 9 20 S 9 22 SW 8 18 W 10 21
Valley SW 12 29 SW 11 27 SW 10 24 SW 7 19 S 8 18 S 8 20 SW 7 17 W 9 20

Temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m 3 ° 3 ° 3 ° 3 ° 4 ° 4 ° 3 ° 3 °
300m 5 ° 5 ° 4 ° 5 ° 6 ° 6 ° 5 ° 4 °
Valley 6 ° 5 ° 5 ° 5 ° 7 ° 6 ° 5 ° 5 °

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 -3 ° -3 ° -3 ° -2 ° -2 ° -2 ° -2 ° -3 °
300m 1 ° 1 ° 1 ° 2 ° 3 ° 3 ° 2 ° 1 °
Valley 2 ° 2 ° 1 ° 3 ° 4 ° 4 ° 3 ° 2 °

Freezing level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 900 m 1,000 m 1,000 m 1,000 m 1,100 m 1,200 m 1,100 m 1,000 m
Sunrise: 08:15
Sunset: 16:03
Moon phase: First quarter

Weather

Patchy cloud as scattered showers overnight, these wintry over the highest tops. Some drier and brighter spells during the morning, but it will be mostly cloudy with outbreaks of rain, heavy and persistent through the afternoon and early evening. It will turn drier again with a scattering of showers later in the evening.

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

70% early in the day, occasional cloud with base 600 to 900m. Nil to 30% later in the afternoon and early evening, extensive cloud with base around 600m, occasionally lowering to 300m.

Visibility

Good or very good, falling moderate in rain. Poor or very poor at times over the tops.

Meteorologist's view

Nothing to add.

Recent rainfall

  • Location: Neuadd (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 15:00 on Sat 15 Dec 2018
  • Last 24 hours: 9mm
  • Last 48 hours: 9.2mm
  • Last 72 hours: 9.2mm

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 17 December 2018

Sunrise: 08:16
Sunset: 16:03
Moon phase: First quarter

Weather

Some patchy low cloud and mist overnight, tending to lift during the day. Otherwise some dry and bright spells during the morning. Cloud thickening and lowering again in the afternoon with occasional rain, the odd heavier burst in the evening.

Maximum wind speed expected

Southwest 20 to 30 gusts 40mph, later 50 gusting 70mph

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

60% around the middle of the day, occasional cloud around 600m, but 30% early or later in the day.

Temperature

  • At 600m Plus 5 Celsius
  • Valley Plus 3 Celsius rising to 8 Celsius
  • Freezing level Above the summits

Visibility

Good or very good, but moderate at times in rain and poor in any mist. Occasionally poor or very poor over the tops.

Tuesday 18 December 2018

Sunrise: 08:17
Sunset: 16:03
Moon phase: Waxing gibbous

Outbreaks of heavy rain and severe gale or storm force southerly winds.

Wednesday 19 December 2018

Sunrise: 08:18
Sunset: 16:04
Moon phase: Waxing gibbous

Occasional bright or clear spells and heavy, blustery showers. Strong or gale force south or southwest winds over the tops.

Thursday 20 December 2018

Sunrise: 08:18
Sunset: 16:04
Moon phase: Waxing gibbous

Occasional bright or clear spells and heavy showers. The showers occasionally wintry over the tops. Strong or gale force west or northwesterly winds at height.

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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