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Brecon Beacons - Mountain weather forecast

Weather warnings

Warnings affecting Brecon Beacons over the next 5 days

Confidence

High for Wednesday then low for details on Thursday and Friday. High for cold conditions to become established by the weekend.

  • This evening
  • Wednesday
  • Thursday
  • Further outlook

Tuesday 21 November 2017

Sunset: 16:16
Moon phase: New

Outbreaks of rain and extensive low cloud. Strong or gale force southwesterly winds.

Wednesday 22 November 2017

Weather hazards

Gales High likelihood Hide detail

Progress will be impeded by very strong winds. Walking will be difficult and strenuous at times with a potential for one to be blown over in gusts. There can be a marked increase in winds through cols or on exposed ridges and summits. Distances often take longer to cover with compass bearings becoming more difficult to follow accurately.

Learn more about gales

Poor visibility High 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

Heavy persistent rain High likelihood Show 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

Storm force winds Low likelihood Show detail

Walking will be very strenuous with any mobility virtually impossible over exposed ground. There is a high likelihood of being blown over or taken off one’s feet, while even standing up may be impossible at times. Basic tasks such as using a map, eating, putting on extra clothing or communication become extremely difficult away from any shelter.

Learn more about storm force winds

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

Headline

Rain and very windy conditions.

Weather

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 600m Heavy rain Heavy rain Cloudy Overcast Heavy rain Heavy rain Heavy rain Heavy rain
Chance of precipitation at 600m 80% 80% 30% 30% 70% >95% >95% 70%

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 28 39 SW 29 41 SW 30 42 SW 34 47 S 40 56 S 39 56 S 33 48 S 30 44
300m SW 18 37 SW 18 38 SW 18 38 SW 21 44 SW 25 52 SW 24 51 S 21 44 SW 20 42
Valley SW 15 35 SW 17 37 SW 16 36 SW 18 41 S 21 50 SW 21 53 S 18 42 S 17 39

Temperature

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

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 ° 4 ° 5 ° 5 ° 5 ° 5 ° 4 °
300m 9 ° 8 ° 8 ° 8 ° 8 ° 8 ° 8 ° 8 °
Valley 9 ° 9 ° 9 ° 9 ° 9 ° 9 ° 9 ° 8 °

Freezing level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 2,500 m 2,100 m 2,100 m 2,300 m 2,400 m 2,300 m 2,200 m 2,000 m
Sunrise: 07:44
Sunset: 16:15
Moon phase: Waxing crescent

Weather

Outbreaks of rain overnight clearing by dawn then mainly dry at first with the odd spot of rain. However, by around midday the rain will turn heavy and persistent and remain so for the rest of the day and evening. Severe gale or storm force winds will give very difficult walking conditions. Drenching conditions and high watercourses expected.

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

Almost nil. Cloud will be persistent and extensive above 500 or 600m, occasionally down to lower slopes.

Visibility

Good at times through the morning at low levels. Otherwise, mainly poor due to cloud or heavy rain.

Meteorologist's view

Wind speeds above 600m will pick up to storm force with gusts over 70mph in the afternoon on summits and where it funnels over ridges.

Recent rainfall

  • Location: Neuadd (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 15:00 on Tue 21 Nov 2017
  • Last 24 hours: 9.6mm
  • Last 48 hours: 20.8mm
  • Last 72 hours: 21.8mm

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.

Thursday 23 November 2017

Sunrise: 07:46
Sunset: 16:14
Moon phase: Waxing crescent

Weather

Rain clears overnight then dry and bright for a while, perhaps for most of the day. Turning colder with a significant wind-chill on the summits. A spell of rain, sleet or summit snow are possible for a while in the afternoon or evening but low confidence.

Maximum wind speed expected

Southwesterly 30-40mph with gusts 60mph, easing to 15-20mph later.

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

Almost nil overnight with cloud down to 300 or 400m. Becoming 80% by dawn as cloud lifts and breaks up from the summits. Cloud may become extensive for a time late in the day.

Temperature

  • At 600m Plus 9 falling to Plus 3 around dawn.
  • Valley Plus 12 overnight, falling Plus 8 in the morning.
  • Freezing level Above summits overnight falling to 800m around dawn.

Visibility

Under the cloud, generally good with clear views during the day, perhaps poor for a while later in rain, sleet or snow.

Friday 24 November 2017

Sunrise: 07:48
Sunset: 16:13
Moon phase: Waxing crescent

Mainly dry at first then persistent rain, sleet or snow pushes up from the south, but low confidence for the extent of this. Freezing level 800m falling to 500m later. Light winds.

Saturday 25 November 2017

Sunrise: 07:49
Sunset: 16:12
Moon phase: First quarter

Turning brighter and colder with strong northwesterly winds and a severe wind chill. Occasional wintry showers with freezing level 500 or 600m.

Sunday 26 November 2017

Sunrise: 07:51
Sunset: 16:11
Moon phase: First quarter

Remaining cold with bright spells and wintry showers. Fresh westerly 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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