Mountain weather

Brecon Beacons

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Brecon Beacons Mountain weather forecast table

Confidence

High confidence for a mixture of sunny spells and scattered showers on most days. Also for winds to be easing. Moderate confidence for intensity and frequency of showers on most days.

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Mountain hazards

Mountain weather hazards

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

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.
hazard Strong sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.

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.

Mountain weather forecast

A mixture of sunny spells and occasional showers. Breezy.

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

Weather

It will be a cloudy start to the day, with occasional showers, which are likely to be heavy and possibly thundery, mainly during the early morning, with an additional hazard from the risk of lightning. Sunday afternoon will see a mixture of sunny spells and occasional showers, although they will be more widely scattered. Mainly dry through the evening, though still with a low risk of some heavy and thundery showers.

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

60% with cloud bases down to 400-500m through the morning, increasing to 80% during the afternoon, but occasionally lowering onto the summits in any showers.

Visibility

Good views of distant hills between the showers, up to 30km away, but falling to just a few kilometres in heavy showers, especially during the morning.

Meteorologist's view

A brisk southwesterly wind, which could gust up to 45mph on peaks and ridges during the afternoon, making it feel on the cool side across the summits. Therefore, it is advisable to take an extra layer if you're spending any length of time walking or hiking in the hills. It may be slippery underfoot after any passing showers, so suitable footwear is also advisable.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
1.4mm30.6mm32.6mm
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.

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Mountain weather information

Weather

Further heavy and possibly thundery showers overnight. Monday will generally be another day of sunny spells and scattered showers, locally heavy and possibly thundery at times again. The showers will tend to ease during the evening.

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

60% with cloud bases down to 400m during the morning, increasing to 80% during the afternoon, but occasionally lowering onto summits in heavy showers.

Maximum wind speed expected

West south-westerly 20-25mph, gusting 30-35mph.

Temperature

  • At 600m Plus 6 Celsius, becoming Plus 10 Celsius.
  • Valley Plus 8 Celsius, becoming Plus 19 Celsius.
  • Freezing level Above the summits.

Visibility

Good views of distant hills between the showers, up to 30km away, but falling to just a few kilometres in any heavier showers.

Mountain weather information

Tuesday 20 August

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After a cool start, It will be another day of sunny spells and scattered showers, possibly heavy and thundery at times. Winds will be lighter compared to recent days.

Wednesday 21 August

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A cool and bright start, with perhaps some mist and fog patches in the valleys first thing. Otherwise, it will be another day of sunny spells and scattered showers.

Thursday 22 August

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A band of showery rain will move quickly eastwards overnight. After a wet start on Thursday it should become largely dry with bright or sunny spells developing. It will be on the cool and breezy side.

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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.