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Brecon Beacons - Mountain weather forecast

Weather warnings

Warnings affecting Brecon Beacons over the next 5 days

Confidence

Medium on details due to the rather changeable conditions.

  • This evening
  • Friday
  • Saturday
  • Further outlook

Thursday 26 April 2018

Sunset: 20:29
Moon phase: Waxing gibbous

Showers dying out. Clear spells developing.

Friday 27 April 2018

Weather hazards

Poor visibility High 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

Heavy persistent rain Medium likelihood Show 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

Blizzards Low likelihood Show detail

Blizzards and whiteouts present challenging and serious conditions due to a combination of falling or blowing snow, strong winds and cold temperatures. They can be highly disorientating, often resulting in near-zero visibility with limited or no visual references and no distinction between ground and sky. Cliff edges and cornices may not be apparent, even close up. These conditions require very good navigational skills.

Learn more about blizzards

Heavy snow Low likelihood Show detail

Heavy snow can lead to rapid changes in underfoot conditions and paths may become treacherous or hidden. It also brings very poor visibility and often makes navigation much more challenging. When deep snow accumulates progress is often time consuming and strenuous, significantly affecting the distance one can travel on foot. Deep drifts can develop if snow is combined with strong winds. A heightened avalanche risk is possible and avalanche reports should be consulted where available.

Learn more about heavy snow

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

Cloudy with outbreaks of rain, sleet and snow.

Weather

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 600m Cloudy Sleet shower Sleet shower Sleet shower Sleet shower Heavy rain Light rain Overcast
Chance of precipitation at 600m 20% 30% 50% 80% 90% 80% 50% 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 S 9 11 SE 10 13 SE 13 16 E 17 22 E 15 20 NE 15 21 NE 18 23 N 17 22
300m SW 3 9 SE 3 7 E 6 12 E 8 16 E 9 17 NE 9 19 NE 9 19 N 8 17
Valley E 2 4 E 4 8 E 6 13 E 8 17 NE 9 18 NE 9 19 NE 8 19 N 7 17

Temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
600m 4 ° 3 ° 3 ° 2 ° 3 ° 4 ° 4 ° 3 °
300m 6 ° 5 ° 5 ° 5 ° 5 ° 6 ° 6 ° 5 °
Valley 6 ° 6 ° 5 ° 5 ° 6 ° 7 ° 6 ° 6 °

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 0 ° -1 ° -2 ° -3 ° -2 ° -1 ° -2 ° -2 °
300m 5 ° 4 ° 2 ° 2 ° 2 ° 3 ° 3 ° 2 °
Valley 6 ° 5 ° 3 ° 2 ° 3 ° 4 ° 4 ° 3 °

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 900 m 1,100 m 1,200 m 1,300 m 1,100 m
Sunrise: 05:53
Sunset: 20:31
Moon phase: Waxing gibbous

Weather

Cloud thickening overnight with outbreaks of rain, sleet and snow, the snow mainly above 700m. Overcast with further rain, sleet and snow during daylight hours, heavy and persistent at times. The snow level will remain around 700m. The cloud beginning to lift and break during the evening with drier spells.

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

Nil to 20%, extensive cloud, bases 300 to 600m, although only patches near or above the summits overnight.

Visibility

Moderate or good, occasionally poor, but very poor over the tops.

Meteorologist's view

A cold day with sleet and snow at height. Extensive cloud. Some wind chill expected.

Recent rainfall

  • Location: Neuadd (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 15:00 on Thu 26 Apr 2018
  • Last 24 hours: 0.6mm
  • Last 48 hours: 11.4mm
  • Last 72 hours: 20.4mm

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.

Saturday 28 April 2018

Sunrise: 05:51
Sunset: 20:33
Moon phase: Waxing gibbous

Weather

Rather cloud overnight, the best of any clearer spells will be in the west. The cloud will lift and break during the morning with bright spells. However, the odd shower is expected to develop through the afternoon and early evening. The showers could be heavy and will be wintry over the tops.

Maximum wind speed expected

Northeast 10 to 20mph

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

60 to 80%, mainly patchy cloud, bases near or above the summits, although it will be lower overnight, early morning and in any showers.

Temperature

  • At 600m Plus 3 to 5 Celsius
  • Valley Plus 4 Celsius rising to Plus 11 Celsius.
  • Freezing level 800 to 1100m

Visibility

Mostly very good, but moderate or poor in showers.

Sunday 29 April 2018

Sunrise: 05:49
Sunset: 20:34
Moon phase: Full

Mainly dry with clear spells overnight. Bright or sunny spells with isolated showers developing during the day, any showers wintry over the tops. Cold with fresh or strong northeast winds over the tops.

Monday 30 April 2018

Sunrise: 05:47
Sunset: 20:36
Moon phase: Full

Mainly cloudy with some bright spells and wintry showers. Cold or very cold over the tops with strong to gale force northerly winds. Freezing around summit level.

Tuesday 1 May 2018

Sunrise: 05:45
Sunset: 20:38
Moon phase: Full

Mainly dry and bright with sunny spells. However, rain and strengthening southwest winds expected later.

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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