Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High for unsettled, but lowering for detail of intensity and timing of worst of the weather.

Sunrise:
Sunset:

This evening forecast

Area of rain extending from the west, occasionally turning heavy late evening. Strong to gale south to southwest summit winds. Freezing level above all peaks.

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 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.

Mountain weather forecast

Rather cloudy with showers and longer periods of rain. Strong to gale winds gradually easing. Freezing level above summits.

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Heavy rain Light rain Light rain Light rain Cloudy Sunny intervals Cloudy Light rain
Chance of precipitation
(at 600m)
90% 60% 30% 30% 20% 20% 20% 60%

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
27
SW
25
SW
23
SW
17
SW
14
SW
11
SW
7
S
5
300m SW
16
SW
15
SW
13
SW
11
SW
9
SW
8
SW
4
S
2
Valley SW
14
SW
13
SW
12
SW
10
SW
9
SW
7
SW
3
S
1
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 35 34 31 23 19 15 10 7
300m 33 30 27 22 18 15 9 5
Valley 32 29 27 20 17 15 8 5

Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
300m
10°
12°
12°
10°
Valley
10°
11°
12°
12°
10°
Freezing Level
2,100m
1,800m
1,700m
1,600m
1,500m
1,600m
1,400m
1,800m

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

Additional weather information

Meteorologist's view

Nothing to add.

Weather

A rather cloudy day with showers occasionally merging to longer periods of rain. Outbreaks most persistent and heavy overnight and again during the evening with best chance of limited brighter spells across the east of the Park.

Chance of cloud-free hill tops

30-40%

Low cloud and visibility

Good becoming moderate or poor in rain, very poor within cloud with bases quite extensive from 600m, probably more broken in the east and during the morning.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
3.2mm23mm24.2mm
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

Overcast with periods of rain turning heavy at times, perhaps some drier, brighter conditions developing late afternoon.

Chance of cloud-free hill tops

10-20%

Maximum wind speed expected

Southwest 20mph easing variable 15mph or less by late morning.

Temperature

  • At 600m Plus 7 Celsius
  • Valley Plus 7 Celsius increasing 17 Celsius for the afternoon
  • Freezing level Above all peaks

Low cloud and visibility

Good becoming moderate or poor in rain, very poor within cloud with bases quite extensive from 600m, perhaps lifting and breaking late in the day.

Mountain weather information

Thu 21 Mar

Sunrise:
Sunset:

Mainly dry, occasionally bright start, then rain developing for the afternoon. Southwest summit winds strong. Freezing level above all peaks.

Fri 22 Mar

Sunrise:
Sunset:

Fresh to strong showery westerly flow. Outbreaks occasional, with some heavy and perhaps wintry across highest tops as the freezing level lowers to 800m.

Sat 23 Mar

Sunrise:
Sunset:

Showery west to northwest flow strong initially, easing a little later in the day. Outbreaks occasional with some heavy and occasionally wintry across highest tops with freezing level around 800m.

Updated at:

Summit specific forecast

Mountain summit forecast map

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