Mountain weather

Brecon Beacons Mountain weather forecast table

Confidence

High for largely settled conditions over the weekend but moderate regarding cloud/fog details. High for a marked change to much more changeable conditions early next week as a cold front introduces cooler more showery conditions from Monday, but also improved air clarity.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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

Low cloud and mist at first. Mostly cloudy with a few bright spells in places.

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

Meteorologist's view

Often very poor visibilities above 400-500m, making navigation challenging across the Brecon Beacons.

Weather

A cloudy and in places murky start to the day with widespread low cloud giving poor visibility on the higher tops. A chance of some light drizzle at times first thing. Tending to slowly improve with a chance of some brief bright spells, especially across the north and east by midday and then this afternoon. This evening cloudy with cloud bases lowering onto hill tops.

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

20%, increasing to 50% from midday, mainly across eastern areas.

Visibility

Extensive and persistent cloud above 400-500m this morning, with periods as low as 300m across the south. This will give widely very poor visibilities and make navigation challenging, particularly on any high featureless terrain. Some temporary breaks are possible across northern and eastern areas. Cloud tending to slowly lift to around 550-600m by noon with an increasing chance of breaks developing more widely this afternoon, especially across the north and east. Good visibilities below the cloud.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
0.4mm1.4mm1.6mm
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.

Sunrise:
Sunset:

Mountain weather information

Weather

Low cloud and a chance of some drizzle first thing, but brightening up by midday with some sunny spells likely through the afternoon, especially across northern and eastern areas. Cloud thickening during the evening, with rain possibly reaching the far west by midnight. Becoming windy after dark.

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

30% increasing to 70% during the afternoon. Falling to 40% after dark.

Maximum wind speed expected

Southerly 20mph gusting 30mph. Steadily increasing through the afternoon to reach southerly 25mph gusting 40mph by late evening.

Temperature

  • At 600m Plus 13 Celsius.
  • Valley Plus 11 Celsius rising to plus 20 Celsius.
  • Freezing level Well above the summits.

Visibility

Generally poor or very poor in periods of cloud above 400-500m during the morning. Cloud becoming patchy above 600m during the afternoon with generally good visibilities below this level. Periods of cloud developing above 350-500m by late evening.

Mountain weather information

Monday 27 September

Sunrise:
Sunset:

Heavy overnight rain clearing soon after dawn to leave a blustery day with sunshine and showers. Some of the showers are likely to be heavy with a risk of small hail and thunder. Strong south-westerly winds with a chance of these touching gale force on the highest summits. Feeling much colder.

Tuesday 28 September

Sunrise:
Sunset:

Remaining unsettled with showers or longer periods of rain, often heavy, but details at this stage are uncertain. Windy with a chance of gales for a time and feeling cold on the summits.

Wednesday 29 September

Sunrise:
Sunset:

Staying changeable with a mixture of bright/sunny spells and showers, these possibly heavy at times. Moderate to strong westerly winds and feeling cold on the summits.

Updated at:

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.