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Brecon Beacons - Mountain weather forecast

Weather warnings

Warnings affecting Brecon Beacons over the next 5 days

Confidence

High for general trend. Low for detail of low cloud and poor visibility from Tuesday to Friday.

  • Monday
  • Tuesday
  • Further outlook

Monday 25 September 2017

Weather hazards

Poor visibility Medium likelihood Hide 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

Forecast

Cloudy with widespread mist and fog

Weather

06:00 09:00 12:00 15:00 18:00 21:00
Weather at 600m Fog Fog Light rain Light rain Cloudy Cloudy
Chance of precipitation at 600m 20% 30% 60% 60% 40% 30%

Wind speed and direction

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m N 6 9 N 7 9 N 6 10 N 7 12 N 6 9 NE 5 8
300m W 3 6 NW 3 7 NE 4 9 NE 5 12 N 4 9 NE 3 6
Valley W 4 6 NW 3 7 NE 4 9 NE 4 11 NE 4 9 NE 3 6

Temperature

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m 11 ° 11 ° 13 ° 13 ° 12 ° 11 °
300m 12 ° 13 ° 16 ° 16 ° 14 ° 13 °
Valley 13 ° 14 ° 17 ° 17 ° 15 ° 13 °

Feels like temperature

06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m 10 ° 10 ° 12 ° 12 ° 11 ° 11 °
300m 12 ° 13 ° 16 ° 16 ° 14 ° 13 °
Valley 12 ° 14 ° 17 ° 17 ° 15 ° 13 °

Freezing level

06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 2,400 m 2,300 m 2,300 m 2,400 m 2,300 m 2,400 m
Sunrise: 07:04
Sunset: 19:06
Moon phase: Waxing crescent

Weather

Cloudy with extensive mist and fog and occasional light rain. During the morning the cloud base may lift a little improving conditions at lower levels but higher peaks are expected to remain shrouded in cloud all day. Most of the park will become dry during the morning, though further showery bursts of rain are possible.

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

10% becoming 20%.

Visibility

Generally poor but improving to moderate at times during the morning at lower elevations.

Meteorologist's view

Nothing to add.

Recent rainfall

  • Location: Neuadd Rain (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 03:00 on Mon 25 Sep 2017
  • Last 24 hours: 10mm
  • Last 48 hours: 11mm
  • Last 72 hours: 18.8mm

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.

Tuesday 26 September 2017

Sunrise: 07:06
Sunset: 19:04
Moon phase: Waxing crescent

Weather

After a dull start with areas of mist and fog conditions will steadily improve during the morning with some bright or sunny spells likely in the afternoon. Although the odd light shower couldn't be ruled out, a generally dry day with light winds across the park.

Temperature

  • At 600m Plus 8 becoming Plus 11 Celsius.
  • Valley Plus 5 becoming Plus 15 Celsius.
  • Freezing level Above summits.

Visibility

Poor during the morning improving to moderate, perhaps good in places, during the afternoon.

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

20% becoming 70% during the afternoon.

Maximum wind speed expected

Southerly 10 mph

Wednesday 27 September 2017

Sunrise: 07:07
Sunset: 19:01
Moon phase: Waxing crescent

Starting dry and largely fine on Wednesday with a moderate south easterly breeze. Winds will slowly increase through the day as a band of rain and associated hill fog moves in from the west during the afternoon. The rain may turn heavy and persistent going towards midnight with winds possibly reaching gale force.

Thursday 28 September 2017

Sunrise: 07:09
Sunset: 18:59
Moon phase: First quarter

A cloudy start with a little rain or drizzle but soon becoming drier and brighter from the west with winds much lighter.

Friday 29 September 2017

Sunrise: 07:11
Sunset: 18:57
Moon phase: First quarter

Cloudy with heavy rain and strong winds spreading in during the early hours. However, during the morning the rain will clear eastwards and cloud will break allowing some drier brighter spells to develop. Further showers are also possible.

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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