Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

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

Sunrise:
Sunset:

This evening forecast

Overcast with some patchy light rain. Moderate 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.

Mountain weather forecast

Rain for much of the day, clearing to showers around late afternoon. Moderate winds. Freezing level lowering later in the day.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Light rain Light rain Light rain Heavy rain Light rain Light rain Sunny intervals Sleet shower (night)
Chance of precipitation
(at 600m)
70% 70% 90% 90% 90% 40% 20% 30%

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
14
SW
15
SW
17
SW
21
SW
18
NW
16
NW
12
NW
12
300m SW
9
SW
9
SW
10
SW
13
SW
13
W
11
W
7
W
6
Valley SW
8
SW
8
SW
8
SW
10
SW
12
W
10
W
6
W
6
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 20 22 23 27 24 22 17 17
300m 20 20 21 26 24 21 15 14
Valley 19 19 20 24 24 20 15 14

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
300m
10°
Valley
10°
Freezing Level
1,600m
1,700m
1,600m
1,900m
2,000m
1,800m
1,000m
800m

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

Additional weather information

Meteorologist's view

Navigation very difficult for much of the day in rain and extensive hill fog.

Weather

Overcast through much of the day with periods of light to moderate rain. Rain clearing erratically to showers and brighter spells towards late afternoon. Showers continuing through the evening and turning to snow above 500m.

Chance of cloud-free hill tops

10% becoming 50% for late afternoon

Low cloud and visibility

Good or very good becoming moderate or poor in rain, very poor in snow and within cloud with bases extensive from 400m at first before lifting and breaking erratically during the late afternoon.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
10.4mm11.8mm11.8mm
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 start with showers or longer periods of rain, initially snow above 600m. Showers dwindling through the afternoon and evening. Strong summit winds.

Chance of cloud-free hill tops

30% becoming 75% for the afternoon

Maximum wind speed expected

West or northwest 20-30mph with gusts reaching 40-45mph across exposed ridges and summits.

Temperature

  • At 600m Zero to plus 1 Celsius increasing plus 4 Celsius for the afternoon
  • Valley Plus 2 Celsius increasing 10 Celsius for the afternoon
  • Freezing level 600-700m at dawn, lifting above summits by late morning

Low cloud and visibility

Good becoming moderate or poor in rain, very poor in snow and within cloud with bases quite extensive from 500m at first before lifting and breaking for the afternoon.

Mountain weather information

Sun 29 Mar

Sunrise:
Sunset:

Isolated showers merging to longer periods of rain and summit sleet either side of noon. Strong summit winds. Freezing level above summits.

Mon 30 Mar

Sunrise:
Sunset:

Cloudy to overcast with patchy light rain or drizzle. Fresh to strong winds. Freezing level above the summits.

Tue 31 Mar

Sunrise:
Sunset:

Overcast with patchy light rain. Fresh or strong winds. Freezing level above the summits.

Updated at:

Summit specific forecast

Mountain summit forecast map

Loading map…