Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High, but Medium for rainfall details on Monday.
This evening forecast
Strengthening SW winds, lowering cloud and outbreaks of rain.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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
Cloudy and windy. Occasional rain.
| 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) |
30% | 50% | 50% | 50% | 40% | 30% | 40% | 50% |
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
34
|
SW
31
|
SW
32
|
S
35
|
S
33
|
S
34
|
S
33
|
S
30
|
| 300m |
SW
19
|
SW
18
|
SW
17
|
SW
19
|
S
20
|
SW
19
|
S
21
|
S
18
|
| Valley |
SW
15
|
SW
16
|
SW
15
|
SW
14
|
SW
17
|
SW
15
|
SW
18
|
S
17
|
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 | 44 | 41 | 41 | 45 | 41 | 43 | 44 | 40 |
| 300m | 39 | 37 | 35 | 39 | 40 | 38 | 42 | 38 |
| Valley | 35 | 35 | 33 | 33 | 37 | 34 | 39 | 37 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
5°
|
5°
|
5°
|
5°
|
6°
|
6°
|
6°
|
6°
|
| 300m |
7°
|
8°
|
8°
|
8°
|
9°
|
9°
|
9°
|
9°
|
| Valley |
8°
|
8°
|
8°
|
8°
|
10°
|
10°
|
10°
|
10°
|
| Freezing Level |
2,200m
|
2,400m
|
2,800m
|
2,800m
|
2,400m
|
1,300m
|
1,500m
|
1,900m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-2°
|
-1°
|
-1°
|
-1°
|
0°
|
1°
|
1°
|
1°
|
| 300m |
3°
|
3°
|
4°
|
3°
|
5°
|
5°
|
5°
|
5°
|
| Valley |
5°
|
4°
|
5°
|
5°
|
6°
|
7°
|
6°
|
6°
|
Additional weather information
Meteorologist's view
Nothing further to add.
Weather
Rather cloudy with patchy rain at times. Some drier spells, the best of these in the afternoon with the cloud lifting.
Chance of cloud-free hill tops
30% becoming 60% in the afternoon.
Low cloud and visibility
Extensive low cloud base 400 to 600m, lifting above the summits at times in the afternoon. Visibility moderate to very poor in rain and cloud, but good at times in the afternoon.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.2mm | 4.8mm | 5mm |
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
Outbreaks of heavy and persistent rain overnight and through daylight hours with a flooding risk. The rain should turn lighter and patchy during the evening.
Chance of cloud-free hill tops
10% becoming 40% in the evening.
Maximum wind speed expected
South or Southwest 20 to 30mph gusting 40mph.
Temperature
- At 600m Plus 4 to 7 Celsius
- Valley Plus 7 to 11 Celsius
- Freezing level Above the summits
Low cloud and visibility
Extensive low cloud base 300 to 500m, tending to lift and break late in the day. Visibility moderate to very poor, improving late in the day.
Mountain weather information
Tue 16 Dec
Sunrise:
Sunset:
Dry and bright with some sunny or clear spells. Frost and valley fog or freezing fog possible. Light or moderate west or northwest winds at height. Freezing level well down early and late, but rising towards the summits by day.
Wed 17 Dec
Sunrise:
Sunset:
Lowering cloud with outbreaks of rain, heavy at times. South or southwest winds becoming strong to gale force at height.
Thu 18 Dec
Sunrise:
Sunset:
Further heavy and persistent rain possible, but confidence low. Strong to gale force summit winds also possible.
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.