Mountain weather
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.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
40% | 40% | 30% | 60% | 90% | >95% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
SW
17
|
SW
24
|
SW
28
|
S
25
|
S
26
|
S
28
|
| 300m |
SW
8
|
SW
13
|
SW
16
|
SW
15
|
S
14
|
SW
16
|
| Valley |
SW
6
|
SW
11
|
SW
14
|
SW
12
|
S
10
|
SW
12
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 24 | 30 | 36 | 32 | 34 | 37 |
| 300m | 20 | 27 | 32 | 29 | 29 | 34 |
| Valley | 19 | 25 | 29 | 26 | 26 | 30 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
3°
|
4°
|
5°
|
6°
|
5°
|
6°
|
| 300m |
6°
|
7°
|
8°
|
9°
|
8°
|
8°
|
| Valley |
6°
|
8°
|
9°
|
10°
|
8°
|
9°
|
| Freezing Level |
1,000m
|
1,100m
|
1,200m
|
1,400m
|
1,800m
|
2,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-2°
|
-2°
|
-1°
|
0°
|
0°
|
1°
|
| 300m |
3°
|
3°
|
5°
|
5°
|
4°
|
5°
|
| Valley |
4°
|
5°
|
6°
|
7°
|
6°
|
6°
|
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. A band of rain, locally heavy, will arrive from the west by late-afternoon and move eastward 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 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 2.8mm | 3.4mm | 3.4mm |
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.
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
Loading map…
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.