Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High for the general evolution in the week ahead but moderate for the timing of the rain on Wednesday night or Thursday.

Sunrise:
Sunset:

This evening forecast

Some late sunny spells this evening then thickening cloud after dark.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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 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

Damp at first with some morning showers, then warm sunny spells developing.

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Drizzle Drizzle Drizzle Light shower (day) Sunny intervals Sunny intervals Sunny intervals Cloudy
Chance of precipitation
(at 600m)
60% 80% 90% 80% 40% 20% 20% 30%

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 S
23
SW
21
SW
22
SW
21
SW
21
SW
19
SW
16
SW
13
300m S
13
SW
12
SW
13
SW
14
SW
14
SW
14
SW
12
SW
8
Valley SW
9
SW
11
SW
10
SW
13
W
13
SW
13
SW
11
SW
8
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 29 27 29 29 28 27 23 19
300m 27 24 26 27 26 26 22 17
Valley 23 24 23 26 26 26 21 18

Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
12°
13°
13°
13°
14°
14°
13°
13°
300m
14°
14°
15°
16°
17°
18°
16°
14°
Valley
14°
14°
15°
16°
18°
18°
16°
15°
Freezing Level
2,900m
2,700m
2,600m
2,500m
2,500m
2,600m
2,600m
2,600m

Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
10°
11°
10°
10°
300m
11°
12°
13°
13°
15°
15°
14°
14°
Valley
13°
13°
14°
14°
16°
16°
15°
14°

Additional weather information

Meteorologist's view

A day of two halves with poor visibility at first and navigational challenges, but then bright, warm and humid with sunny spells during the afternoon. Periods of strong sunshine developing with high UV levels to plenty of sun protection is advised as well as keeping well hydrated.

Weather

Damp and drizzly through the early hours with some more persistent rain possible, especially in the west. A few showers through the morning and turning brighter albeit with rather cloudy skies. Increasingly frequent sunny spells developing through the afternoon and staying dry into the evening.

Chance of cloud-free hill tops

20% becoming 90%, reducing to 30% after dark.

Low cloud and visibility

Widespread and persistent cloud above 400-500m through the early hours and during the first part of the morning with patches down to 300m at times. Breaks soon developing in the east by mid-morning, with most cloud lifting clear of the summits by early afternoon. Patchy cloud possible above 700m until mid-afternoon and then becoming persistent above 450-500m after dusk. Generally good visibility but often poor first thing at all levels during spells of drizzle and very poor in cloud.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
2.6mm3.6mm3.6mm
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

Cloudy with showery rain or drizzle first thing, though gradually brightening up with broken cloud and sunny intervals during the afternoon. Isolated showers but these tending to fade away to leave a dry end to the day.

Chance of cloud-free hill tops

30% becoming 95%.

Maximum wind speed expected

Northwesterly 15-20 mph.

Temperature

  • At 600m Plus 12 Celsius, becoming 17 Celsius.
  • Valley Plus 13 Celsius becoming plus 22 Celsius.
  • Freezing level Well above the summits.

Low cloud and visibility

Periods of cloud above 400-600m through the morning, this breaking up to become increasingly patchy by mid-afternoon and lifting clear of the summits by the end of the day.

Mountain weather information

Wed 24 Jul

Sunrise:
Sunset:

Remaining dry and settled with plenty of sunny spells and feeling warm with high UV levels. Moderate southwesterly winds.

Thu 25 Jul

Sunrise:
Sunset:

Turning more unsettled but with uncertainty in the detail. Generally cloudy with showery rain, possibly heavy and persistent at times. Moderate southwesterly winds.

Fri 26 Jul

Sunrise:
Sunset:

A drier day is most likely with bright or sunny spells but the risk of the odd shower remains. Light to moderate westerly winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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