Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High
This evening forecast
Heavy rain and southerly gales.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
Mountain weather forecast
Bright spells and occasional showers. Windy and chilly.
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 600m) |
70% | 20% | 30% | 30% | 40% | 30% | 20% | 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 |
W
27
|
W
25
|
W
23
|
W
23
|
W
22
|
W
20
|
W
19
|
SW
23
|
| 300m |
W
15
|
W
14
|
W
13
|
W
14
|
W
14
|
W
14
|
W
13
|
SW
14
|
| Valley |
W
14
|
W
13
|
W
12
|
W
13
|
W
14
|
W
13
|
W
11
|
SW
12
|
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 | 36 | 34 | 31 | 30 | 29 | 28 | 27 | 31 |
| 300m | 34 | 32 | 27 | 27 | 27 | 26 | 27 | 30 |
| Valley | 33 | 30 | 27 | 27 | 27 | 26 | 25 | 29 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
6°
|
4°
|
3°
|
3°
|
4°
|
5°
|
4°
|
3°
|
| 300m |
9°
|
6°
|
5°
|
6°
|
8°
|
8°
|
6°
|
6°
|
| Valley |
10°
|
7°
|
6°
|
7°
|
8°
|
9°
|
7°
|
7°
|
| Freezing Level |
1,400m
|
1,000m
|
900m
|
900m
|
800m
|
900m
|
900m
|
1,000m
|
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°
|
-3°
|
-3°
|
-2°
|
0°
|
-2°
|
-3°
|
| 300m |
6°
|
2°
|
1°
|
2°
|
4°
|
5°
|
3°
|
2°
|
| Valley |
7°
|
4°
|
3°
|
4°
|
5°
|
6°
|
4°
|
3°
|
Additional weather information
Meteorologist's view
Nothing further to add.
Weather
Heavy overnight rain soon clearing. Generally bright with occasional showers and a few sunny breaks. Strong winds at height with a severe wind chill. Mainly dry with some clear spells in the evening.
Chance of cloud-free hill tops
80%, but lowering significantly in any showers.
Low cloud and visibility
Cloud mainly above the summits, lowering significantly in showers. Visibility mostly very good or excellent, but moderate to very poor in showers and cloud.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.2mm | 3.2mm | 3.6mm |
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.
Mountain weather information
Weather
Mainly dry and cloudy overnight. A mainly dry start, but outbreaks of heavy and persistent rain developing during the morning, perhaps thundery at times later. Becoming stormy at height with severe wind chill and buffeting.
Chance of cloud-free hill tops
40%
Maximum wind speed expected
Southwest 40 to 50mph gusting 70mph, severe wind chilly and buffeting.
Temperature
- At 600m Plus 3 to 6
- Valley Plus 5 to 11 Celsius
- Freezing level Above the summits.
Low cloud and visibility
Extensive low cloud, base 400 to 700m. Visibility often moderate to very poor in cloud and rain.
Mountain weather information
Fri 13 Mar
Sunrise:
Sunset:
Overnight rain soon clearing. Bright spells and occasional wintry showers. Fresh to strong west or southwest winds at height with a severe wind chill. Freezing level typically 600m, but could be lower at times, particularly late in the day.
Sat 14 Mar
Sunrise:
Sunset:
The wintry showers well scattered overnight and during the morning with bright or clear spells. The wintry showers then becoming more widespread through the afternoon and evening. Moderate to fresh westerly winds at height with a significant wind chill. Feeling level typically 600 to 800m.
Sun 15 Mar
Sunrise:
Sunset:
Occasional rain then wintry showers. Strong to gale force west or southwest winds with a significant wind chill. Freezing level mainly above the summits, falling 500m later.
Updated at:
Summit specific forecast
Mountain summit forecast map
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Key
Mountain summits
Other points of interest
Cluster of multiple stations
The Bannau Brycheiniog / Brecon Beacons is a mountain range in South Wales comprising six main peaks, with the highest peak, Pen y Fan, standing at 886 metres.