Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for cold west to northwest flow being replaced by a mild and wet southwesterly from Saturday, but lowering for the detail of transition also for the further change to showers then gradually colder conditions through the week to come.
This evening forecast
Clear spells and scattered wintry showers. Brisk westerly summit winds and sub-zero temperatures bringing a severe wind chill.
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.
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
Cold. Scattered showers occasional brighter spells. Severe wind chill despite the easing summit winds.
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 600m) |
40% | 30% | 30% | 40% | 30% | 30% | 30% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
W
22
|
W
23
|
W
22
|
W
20
|
W
19
|
W
14
|
W
11
|
S
8
|
| 300m |
W
12
|
W
12
|
W
12
|
W
11
|
W
12
|
W
8
|
SW
6
|
S
5
|
| Valley |
W
10
|
W
12
|
W
11
|
W
10
|
W
11
|
W
8
|
W
5
|
S
3
|
Wind gust (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m | 30 | 32 | 32 | 29 | 26 | 20 | 16 | 10 |
| 300m | 26 | 27 | 27 | 23 | 23 | 17 | 13 | 8 |
| Valley | 24 | 28 | 27 | 24 | 24 | 17 | 12 | 6 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
-2°
|
-2°
|
-1°
|
-1°
|
1°
|
1°
|
-1°
|
-1°
|
| 300m |
0°
|
0°
|
0°
|
1°
|
3°
|
3°
|
1°
|
1°
|
| Valley |
0°
|
1°
|
1°
|
2°
|
4°
|
4°
|
1°
|
1°
|
| Freezing Level |
200m
|
200m
|
200m
|
300m
|
500m
|
600m
|
500m
|
500m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
-10°
|
-9°
|
-9°
|
-8°
|
-6°
|
-4°
|
-6°
|
-5°
|
| 300m |
-5°
|
-5°
|
-4°
|
-3°
|
-1°
|
0°
|
-2°
|
-2°
|
| Valley |
-4°
|
-4°
|
-4°
|
-3°
|
0°
|
1°
|
-1°
|
-1°
|
Additional weather information
Meteorologist's view
Cold with temperatures minus 3C at first around the foothills and a significant wind chill throughout.
Weather
Occasional brighter spells mixed with scattered showers, with snow level at sea level initially lifting 300-400m from noon.
Chance of cloud-free hill tops
70%
Low cloud and visibility
Very good visibility becoming moderate in rain showers, poor in snow, very poor within cloud with bases occasionally lowering 600m.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 2mm | 5.2mm | 28.6mm |
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
An overcast start to the day with periods of occasionally heavy snow that turns to rain before mid-morning. Rain becoming patchy for the afternoon. Conditions hazardous at first in snow, hill fog and strong summit winds.
Chance of cloud-free hill tops
10%
Maximum wind speed expected
South to southwest mean 40-45mph with gusts reaching 60mph across more exposed ridges and summits
Temperature
- At 600m Zero Celsius increasing plus 8 Celsius by mid-afternoon
- Valley Minus 2 Celsius increasing 13 Celsius by afternoon
- Freezing level 500m increasing above all summits from mid-afternoon
Low cloud and visibility
Good visibility becoming moderate in rain, poor in snow, very poor within cloud with bases extensive from 500m with patches lower down for southern and western aspects
Mountain weather information
Sun 24 Nov
Sunrise:
Sunset:
Cloudy with periods of rain early in the day, clearing to leave brighter spells and only a few isolated light showers for the afternoon. Freezing level above all peaks. Fresh to strong summit winds.
Mon 25 Nov
Sunrise:
Sunset:
Showers brought on west to southwest breezes. Freezing level remaining above all peaks.
Tue 26 Nov
Sunrise:
Sunset:
Moderate northwest summit winds bringing scattered showers that turn wintry across higher peaks late in the day.
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.