Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for generally mild and occasionally unsettled weather. Lowering confidence for the timing detail of the worst of the conditions.
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
A mainly dry, occasionally bright day. Moderate winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
40% | 10% | <05% | <05% | <05% | <05% |
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
12
|
NW
12
|
W
12
|
SW
11
|
SW
14
|
SW
14
|
| 300m |
SW
8
|
W
7
|
W
6
|
SW
6
|
SW
8
|
SW
8
|
| Valley |
SW
7
|
W
6
|
W
6
|
SW
5
|
SW
6
|
SW
6
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 17 | 15 | 15 | 16 | 20 | 21 |
| 300m | 15 | 15 | 13 | 15 | 18 | 18 |
| Valley | 16 | 15 | 12 | 14 | 16 | 17 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
6°
|
5°
|
5°
|
5°
|
5°
|
5°
|
| 300m |
8°
|
6°
|
7°
|
7°
|
6°
|
6°
|
| Valley |
8°
|
7°
|
8°
|
8°
|
6°
|
6°
|
| Freezing Level |
1,700m
|
1,100m
|
1,000m
|
1,100m
|
1,100m
|
1,100m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
3°
|
1°
|
1°
|
2°
|
1°
|
0°
|
| 300m |
6°
|
4°
|
6°
|
5°
|
3°
|
3°
|
| Valley |
7°
|
5°
|
6°
|
7°
|
4°
|
4°
|
Additional weather information
Meteorologist's view
Severe wind chill effect confined to highest routes.
Weather
Rain clearing early morning to leave a largely fine and dry day, with bright or sunny spells. Staying dry with clear skies into the evening.
Chance of cloud-free hill tops
30% at dawn, 90% from late morning
Low cloud and visibility
Good or very good becoming moderate or poor in early rain, very poor within cloud, which will be quite extensive at 600m around dawn, then lifted and well broken from mid-morning.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 2mm | 7.4mm | 50.2mm |
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
Fair conditions by day with the vast majority dry with occasional brighter spells. Cloud reaching from the northwest from late afternoon and through the evening, but staying dry. Summit winds increasing strong to gale during the afternoon.
Chance of cloud-free hill tops
80-90% by day
Maximum wind speed expected
Southwest increasing mean 35-40mph by late afternoon with gusts reaching 50-55mph across more exposed ridges and summits.
Temperature
- At 600m Plus 3 Celsius increasing 6 Celsius
- Valley Plus 3 Celsius increasing 11 Celsius for the afternoon
- Freezing level Above summits
Low cloud and visibility
Good or very good becoming very poor within cloud with bases infrequently lowering 600m.
Mountain weather information
Sun 14 Dec
Sunrise:
Sunset:
Mainly dry start, rain developing later in the day, perhaps turning heavy in west. Summit gales. Freezing level above all summits.
Mon 15 Dec
Sunrise:
Sunset:
Further occasionally heavy rain. Strong summit winds. Freezing level above all summits.
Tue 16 Dec
Sunrise:
Sunset:
Showers and limited brighter spells. Strong summit winds. Freezing level above all summits.
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.