Mountain weather

Bannau Brycheiniog / Brecon Beacons

Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table

Confidence

High of turning milder but remaining occasionally unsettled. Lowering for the confidence in timing detail of worst of conditions.

Sunrise:
Sunset:

This evening forecast

Mainly dry with best of the clear spells in the east. Fresh northerly summit winds, bringing severe wind chill effect in the very low freezing level.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

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

Dry and bright but cold. Winds strengthening later in day.

Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 600m)
Clear night Clear night Clear night Sunny day Sunny day Sunny intervals Cloudy Cloudy
Chance of precipitation
(at 600m)
00% 00% <05% <05% <05% <05% <05% 20%

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 N
14
N
12
N
10
N
7
NW
4
SW
6
S
12
S
15
300m N
3
NE
3
NE
2
SW
1
W
2
SW
3
SW
7
S
8
Valley W
3
E
2
W
2
NW
1
NW
2
SW
2
SW
5
S
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 19 16 14 10 5 8 15 20
300m 12 9 6 4 3 6 14 18
Valley 10 6 4 2 4 5 13 16

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
-2°
-2°
-2°
-1°
300m
-2°
-2°
-3°
-1°
Valley
-1°
-2°
-3°
-1°
Freezing Level
100m
100m
100m
100m
400m
500m
400m
500m

Altitude above mean sea level
Time 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m
-8°
-8°
-7°
-5°
-2°
-2°
-5°
-6°
300m
-4°
-4°
-5°
-2°
-3°
-2°
Valley
-3°
-4°
-5°
-2°
-1°

Additional weather information

Meteorologist's view

Nothing to add

Weather

Largely dry by day with only a few light isolated showers appearing. Feeling cold despite the good spells of weak late autumn sunshine. Cloud increasing for the evening, bringing some patchy light sleet and snow late evening.

Chance of cloud-free hill tops

90% by day

Low cloud and visibility

Visibility very good becoming moderate or poor in sleet, very poor in snow and within cloud with bases infrequently developing to this level.

Recent rainfall

Location: Neuadd (Near Pontsticill)
Altitude: 353m
Last 24 hoursLast 48 hoursLast 72 hours
0mm4.2mm5mm
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

Rain preceded by summit snow, reaching from the west overnight, which clears to showers and brighter spells from mid-morning. Cloud increasing for the afternoon to bring periods of rain for the evening. Summit winds strong at first.

Chance of cloud-free hill tops

10% becoming 75% by noon, 30% late afternoon, then 10% late evening

Maximum wind speed expected

South to southwest initially mean 30mph with gusts reaching 40-45mph across most exposed ridges and summits. Winds easing slowly from mid-morning.

Temperature

  • At 600m Plus 2 Celsius rising 6 Celsius for the afternoon
  • Valley Plus 1 Celsius rising 11 Celsius for the afternoon
  • Freezing level 900m rising above summits

Low cloud and visibility

Visibility good or very good becoming moderate or poor in rain or sleet, very poor in snow and within cloud with bases initially extensive from 600m, lifting and breaking late morning, before thickening and lowering again later in the day.

Mountain weather information

Sun 23 Nov

Sunrise:
Sunset:

Showers or longer periods of rain, occasionally heavy and across higher peaks wintry. Winds fresh to strong, bringing severe wind chill effect at height. Freezing level around 800-900m.

Mon 24 Nov

Sunrise:
Sunset:

Rather cloudy with showers, these wintry across higher routes and dwindling later in the day. Winds strong, bringing severe wind chill effect at height.

Tue 25 Nov

Sunrise:
Sunset:

Mainly dry with some brighter spells. Freezing level around highest peaks. Relatively light winds.

Updated at:

Summit specific forecast

Mountain summit forecast map

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