Mountain weather

Brecon Beacons Mountain weather forecast table

Confidence

High confidence for dry bright skies on Tuesday evening and of grey skies, low cloud, hill fog and a brisk breeze on Wednesday and Thursday. Low confidence of timings of cloud and rain on Wednesday and Thursday. Conditions on Thursday are particularly uncertain and it may be that there isn't much rain at all. Given the lead time there is fairly high confidence of dry bright weather on Friday, Saturday and Sunday.

Sunrise:
Sunset:

This evening forecast

Tuesday evening will be dry, with light winds, good visibility and plenty of late sunshine.

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.

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.

Mountain weather forecast

Low cloud, rain and strong winds in the morning. Brightening up later.

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Cloudy Light rain Heavy rain Heavy rain Light rain Light shower (day) Sunny day Partly cloudy (night)
Chance of precipitation
(at 600m)
20% 60% >95% >95% >95% 30% 10% <05%

Wind direction and speed (mph)
Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m SW
16
SW
18
SW
21
SW
22
W
22
W
21
W
18
W
16
300m SW
10
SW
10
SW
13
SW
15
W
16
W
14
W
13
W
10
Valley SW
8
SW
8
SW
11
SW
13
W
15
W
13
W
12
W
9
Wind gust (mph)
Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m 22 25 28 30 31 31 26 25
300m 21 21 26 29 30 27 25 22
Valley 21 19 24 27 30 28 25 21

Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
10°
11°
11°
300m
10°
10°
11°
13°
14°
14°
11°
Valley
10°
10°
10°
11°
13°
14°
14°
12°
Freezing Level
1,600m
1,500m
2,000m
2,400m
2,000m
1,900m
1,800m
2,300m

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

Additional weather information

Meteorologist's view

Wind speeds and temperatures in these tables look realistic. Heavy showers on Tuesday and added rain on Wednesday mean that it may be quite wet underfoot, with large puddles and bogs, and fast moving streams.

Weather

Low cloud and strong winds will move over the Brecons soon after midnight, with accompanying hill fog and drizzle. Rain will arrive from around 05:00 with some heavy spells over the next three or four hours. The rain will then gradually ease, becoming light and drizzly, but low cloud, strong winds and hill fog are likely to persist until around 14:00. The weather will be much improved after that, but it will stay breezy and the odd light shower remains possible. The evening will be dry and bright with much less cloud.

Chance of cloud-free hill tops

Between 00:00 and 14:00. 10% with thick low cloud covering the hills down to 200m above sea level. Between 14:00 and midnight. 80% with the odd shower cloud obscuring the highest peaks.

Low cloud and visibility

Between midnight and 14:00: Thick hill fog is likely on any hills above 200m above sea level. Although patchy, visibility is likely to be below 50m at times. In the valleys, it will be misty with rain and drizzle so visibility is likely to drop to 4000m at times. After 14:00 Good visibility is expected at all levels, with fine views of surrounding hills.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
3.6mm3.8mm4.2mm
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 strong winds will again move over the Brecons soon after midnight, with accompanying hill fog and drizzle. These may well persist all through the day, not clearing until late evening. Light and patchy rain is likely at times during the day.

Chance of cloud-free hill tops

Between 00:00 and 21:00. 10% with thick low cloud covering the hills down to 200m above sea level. Between 21:00 and midnight. 80% ... but it will be dark.

Maximum wind speed expected

Mean wind speeds of 30 mph and gusts of up to 45mph on the summits any time during the day.

Temperature

  • At 600m 5C at dawn, rising to 9C in the afternoon.
  • Valley 10 C at dawn, rising to 15 C in the afternoon.
  • Freezing level Well above summits.

Low cloud and visibility

Between midnight and 21:00: Thick hill fog is likely on any hills above 200m above sea level. Although fog will be patchy, visibility is likely to be below 50m at times. In the valleys, it will be misty with rain and drizzle so visibility is likely to drop to 4000m at times.

Mountain weather information

Fri 27 May

Sunrise:
Sunset:

Dry and clear with warm sunshine and light winds. Maximum temperatures around 18 C in the valleys.

Sat 28 May

Sunrise:
Sunset:

Dry and clear with warm sunshine and light winds. Maximum temperatures around 19 C in the valleys.

Sun 29 May

Sunrise:
Sunset:

Probably dry and bright, but more cloudy and breezy than Saturday. Max temperatures 17C.

Updated at:

Summit specific forecast

Mountain summit forecast map

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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.