Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for generally southerly flow also for unsettled weather, but lowering for timing detail of worst of conditions.
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
Showers or longer periods of rain, turning heavy at times. Widespread hill fog.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
80% | 60% | 80% | 70% | 40% | 60% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
SE
18
|
S
18
|
S
20
|
S
19
|
SW
16
|
SW
18
|
| 300m |
SE
6
|
S
8
|
S
9
|
S
11
|
SW
10
|
SW
10
|
| Valley |
E
4
|
SE
7
|
S
7
|
S
9
|
SW
8
|
SW
8
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 24 | 23 | 28 | 25 | 23 | 25 |
| 300m | 17 | 20 | 21 | 22 | 21 | 21 |
| Valley | 14 | 18 | 18 | 20 | 20 | 19 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
4°
|
5°
|
6°
|
6°
|
5°
|
5°
|
| 300m |
6°
|
7°
|
8°
|
8°
|
7°
|
7°
|
| Valley |
6°
|
8°
|
9°
|
9°
|
8°
|
8°
|
| Freezing Level |
1,300m
|
1,300m
|
1,400m
|
1,400m
|
1,400m
|
1,300m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-1°
|
0°
|
1°
|
1°
|
1°
|
0°
|
| 300m |
4°
|
4°
|
6°
|
5°
|
4°
|
4°
|
| Valley |
5°
|
6°
|
7°
|
7°
|
6°
|
5°
|
Additional weather information
Meteorologist's view
Difficult conditions in rain, widespread hill fog and across higher routes a severe wind chill.
Weather
A cloudy to overcast day with frequent showers or longer periods of rain that turn heavy at times. This evening the rain eases leaving a few showers, and hill fog becoming widespread again.
Chance of cloud-free hill tops
20-30% improving 40-50% temporarily from late morning to late afternoon.
Low cloud and visibility
Good becoming hazy or poor in rain with nearby hills visible, very poor within cloud with bases quite extensive from 400-500m at first.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 9.2mm | 31.6mm | 32.2mm |
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
Rather cloudy with scattered showers, these especially through the afternoon when some may become heavy. Some brighter spells, mainly appearing through the afternoon and evening.
Chance of cloud-free hill tops
20%, temporarily becoming 60% for the afternoon.
Maximum wind speed expected
South or southeast 15-20mph
Temperature
- At 600m Plus 4-5 Celsius
- Valley Plus 6 Celsius rising to 11 Celsius for the afternoon
- Freezing level Above summits
Low cloud and visibility
Good becoming hazy or poor in rain with nearby hills visible, very poor within cloud with bases quite extensive from 400-500m at first, before lifting and breaking somewhat during the afternoon.
Mountain weather information
Mon 9 Feb
Sunrise:
Sunset:
Rather cloudy with periods of rain, sometimes heavy, and widespread hill fog. Moderate or fresh southeast summit winds developing later. Freezing level above summits.
Tue 10 Feb
Sunrise:
Sunset:
Periods of rain, heavy at times. Widespread hill fog. Moderate southeast summit winds. Freezing level above summits.
Wed 11 Feb
Sunrise:
Sunset:
Periods of rain, heavy at times. Widespread hill fog. Light to moderate 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.