Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High for the mobile nature of the westerly weather patterns, but lowering for the transitional timing detail.

Sunrise:
Sunset:

This evening forecast

Mainly dry with occasional clear spells. Moderate to strong summit winds. Freezing level above summits.

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 Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.

Mountain weather forecast

Rather cloudy with some patchy rain by day. Summit gales developing from late morning.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Cloudy Cloudy Light rain Light rain Light rain Light rain Light rain Heavy rain
Chance of precipitation
(at 600m)
10% 20% 40% 40% 30% 60% 90% >95%

Wind direction and speed (mph)
Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m SW
16
SW
13
SW
16
SW
21
SW
27
SW
25
S
26
SW
29
300m W
8
SW
7
SW
8
SW
12
SW
16
SW
16
S
14
SW
17
Valley W
6
SW
5
SW
6
SW
9
SW
13
SW
13
S
11
SW
13
Wind gust (mph)
Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m 21 18 23 27 35 33 34 39
300m 18 16 19 24 31 30 29 35
Valley 17 15 17 21 28 27 27 31

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
300m
Valley
10°
Freezing Level
1,100m
900m
1,000m
1,100m
1,200m
1,400m
1,800m
1,800m

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
-1°
-2°
-2°
-2°
-1°
300m
Valley

Additional weather information

Meteorologist's view

Quite extensive hill fog bringing significant navigational challenges. Severe wind chill confined to highest routes.

Weather

A cloudy day with patchy light rain developing, with outbreaks most persistent across the western areas of the park and during the afternoon. Band of occasionally heavy rain reaching from the west during the evening.

Chance of cloud-free hill tops

30-40%

Low cloud and visibility

Good or very good becoming moderate or poor in rain, very poor within cloud, which will be quite extensive from 600m.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
3mm3.4mm3.4mm
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

Most staying dry with only a few well scattered showers crossing the Park, most of these expected during the afternoon. Strong west to southwest summit winds bringing a severe wind chill at height. Freezing level above summits.

Chance of cloud-free hill tops

80%

Maximum wind speed expected

West to southwest mean 30-35mph, with gusts reaching 45mph across more exposed ridges and summits.

Temperature

  • At 600m Plus 4 Celsius increasing 7 Celsius for the afternoon
  • Valley Plus 6 Celsius increasing 12 Celsius for the afternoon
  • Freezing level Above summits

Low cloud and visibility

Good or very good becoming moderate or poor in showers, very poor within cloud, which will occasionally lower to 600m.

Mountain weather information

Thu 12 Mar

Sunrise:
Sunset:

Rather cloudy with frequent showers or longer periods of rain, and later summit snow, that turns heavy at times. Strong to gale force summit winds.

Fri 13 Mar

Sunrise:
Sunset:

Occasional showers, heavy at times, with snow level lowering to around 600m. Strong summit winds bringing severe wind chill at height. Freezing level 700m.

Sat 14 Mar

Sunrise:
Sunset:

Rather cloudy with some patchy light rain. Fresh summit winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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