Mountain weather

Brecon Beacons

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Brecon Beacons Mountain weather forecast table


High for rather cold conditions at first a little now over high ground, then turning milder on Thursday. Medium for details from Wednesday.

Mountain hazards

Mountain weather hazards

Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.

hazard Severe chill effect
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.

hazard Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
hazard Poor visibility
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.
hazard Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.

Mountain weather forecast

Mainly dry and bright. Cold and windy over the tops.

Wind direction and speed (mph)
Altitude above mean sea level
Wind gust (mph)
Altitude above mean sea level

Altitude above mean sea level

Altitude above mean sea level

Additional weather information


Cold and windy at first, with sleet or snow over the highest tops. Cloud lifting and breaking during daylight hours, becoming mainly dry with some hazy sunny spells and just isolated showers. Probably on the cloudy side during the evening, with lighter winds allowing some valley fog to develop.

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

80% during daylight hours, patchy or occasional cloud, bases near or above the summits. Valley fog likely to develop during the evening.


Mostly very good, but moderate in rain and poor at times at height.

Meteorologist's view

Nothing further to add.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
Measurement date:

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.


Mountain weather information


Mainly dry and bright with occasional clear spells. A widespread frost expected early and later in the day with patchy mist and freezing fog possible in the valleys.

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

80%, occasional or extensive cloud with base 1000m, occasionally lowering onto the tops.

Maximum wind speed expected

West or Southwest 15mph


  • At 600m Around 2 Celsius
  • Valley Minus 2 Celsius rising to 4 Celsius
  • Freezing level Around 800m, but lower early and later in the day.


Mostly very good. Poor or very poor in any mist and fog.

Mountain weather information

Wednesday 18 December


A frost expected at first with patchy mist and freezing fog possible in the valleys. Otherwise a dry and bright start, but thickening and lowering cloud during the afternoon with outbreaks of heavy rain in the evening. Strengthening south or southeast winds, gales or severe gales over the tops later in the day. Freezing level rising above the summits.

Thursday 19 December


Rather cloudy with occasional rain or showers. However, it could be mainly dry and bright around the middle of the day. Fresh or strong south or southeast winds over the tops. Freezing level well above the summits.

Friday 20 December


Mostly cloudy with occasional rain or drizzle. Fresh south or southeast winds over the tops. Freezing level well above the summits.

Updated at:

Summit specific forecast

Mountain summit forecast map

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.