Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for the mobile nature of the westerly weather patterns, but lowering for the transitional timing detail.
This evening forecast
Cloudy to overcast with occasional rain, most of this focused west of Pen Y Fan. Relatively light winds.
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
Cloudy with occasional rain. Moderate summit winds.
| 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) |
80% | 80% | 90% | 40% | 30% | 40% | 20% | 10% |
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 |
NW
9
|
NW
12
|
N
11
|
N
9
|
N
10
|
N
9
|
N
8
|
NE
9
|
| 300m |
W
7
|
NW
7
|
NW
6
|
NW
5
|
NW
7
|
N
6
|
N
4
|
NE
5
|
| Valley |
W
8
|
NW
6
|
NW
6
|
NW
5
|
NW
6
|
N
5
|
N
4
|
NE
4
|
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 | 12 | 16 | 15 | 13 | 14 | 13 | 12 | 14 |
| 300m | 12 | 12 | 11 | 9 | 11 | 10 | 9 | 10 |
| Valley | 14 | 12 | 12 | 10 | 11 | 10 | 10 | 8 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
4°
|
3°
|
2°
|
2°
|
3°
|
5°
|
4°
|
3°
|
| 300m |
6°
|
5°
|
4°
|
4°
|
7°
|
8°
|
6°
|
5°
|
| Valley |
7°
|
6°
|
5°
|
5°
|
8°
|
9°
|
7°
|
6°
|
| Freezing Level |
1,900m
|
1,700m
|
1,200m
|
1,400m
|
1,400m
|
1,500m
|
1,400m
|
1,600m
|
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°
|
-2°
|
0°
|
2°
|
1°
|
0°
|
| 300m |
3°
|
2°
|
2°
|
2°
|
4°
|
6°
|
5°
|
4°
|
| Valley |
4°
|
4°
|
2°
|
3°
|
6°
|
8°
|
6°
|
5°
|
Additional weather information
Meteorologist's view
Severe wind chill effect confined to higher routes.
Weather
Overcast overnight with periods of generally light rain. Rain persistent during the early morning, patchy from mid-morning and early evening, then largely dry through the rest of the evening.
Chance of cloud-free hill tops
20% becoming 50% from late morning
Low cloud and visibility
Good or very good becoming moderate or poor in rain, very poor within cloud, which will be extensive from 500m early morning, occasionally so thereafter.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.2mm | 0.2mm | 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
Cloudy to overcast with patchy light rain, which turns more persistent late afternoon and through the evening. Light or moderate winds.
Chance of cloud-free hill tops
25%
Maximum wind speed expected
South or southeast 15-20mph
Temperature
- At 600m Zero Celsius increasing 4 Celsius for the afternoon
- Valley Plus 3 Celsius increasing 12 Celsius for the afternoon
- Freezing level 800m at dawn, soon lifting above summits during the morning
Low cloud and visibility
Good or very good becoming moderate or poor in rain, very poor within cloud, which will be quite extensive from 500m.
Mountain weather information
Sun 8 Mar
Sunrise:
Sunset:
Rather cloudy with some patchy light rain. Moderate winds. Freezing level above summits.
Mon 9 Mar
Sunrise:
Sunset:
Cloudy with occasional rain, though most of this should be light and a chance of some brighter spells later in the day. Light winds. Freezing level above summits.
Tue 10 Mar
Sunrise:
Sunset:
Cloudy with occasional rain, turning heavier later in the day. Fresh summit winds. Freezing level above 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.