Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for Tuesday, and high for a change to colder weather for the rest of the working week.
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 with afternoon and evening showers, wintry on the higher tops
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
20% | 30% | 50% | 70% | 80% | 80% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
W
13
|
SW
11
|
W
17
|
W
19
|
W
18
|
W
17
|
| 300m |
SW
8
|
SW
6
|
W
10
|
W
10
|
W
10
|
W
10
|
| Valley |
W
5
|
W
5
|
W
9
|
W
10
|
W
9
|
W
8
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 20 | 16 | 22 | 25 | 26 | 25 |
| 300m | 18 | 15 | 19 | 21 | 22 | 22 |
| Valley | 16 | 13 | 19 | 22 | 21 | 20 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
2°
|
2°
|
3°
|
3°
|
3°
|
2°
|
| 300m |
3°
|
4°
|
6°
|
5°
|
5°
|
4°
|
| Valley |
3°
|
4°
|
7°
|
6°
|
5°
|
5°
|
| Freezing Level |
800m
|
800m
|
900m
|
1,000m
|
1,000m
|
1,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-3°
|
-2°
|
-2°
|
-2°
|
-2°
|
-3°
|
| 300m |
0°
|
1°
|
3°
|
2°
|
1°
|
1°
|
| Valley |
1°
|
2°
|
4°
|
3°
|
2°
|
2°
|
Additional weather information
Meteorologist's view
Nothing to add
Weather
Mainly dry with variable amounts of cloud in the morning. Showers will become increasing frequent during the afternoon and evening, with some sleet or wet snow mixed in the on the highest tops.
Chance of cloud-free hill tops
70%, best chance in the morning.
Low cloud and visibility
Good visibility with a little patchy cloud around 800 metres in the morning. Cloud becoming more extensive down to 700 metres in showers in the afternoon and evening, otherwise some capping cloud around 900 metres at times.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0mm | 0.4mm |
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
Much of the morning will be cloudy with some rain. Snow falling above 600-700 metres and potentially to lower elevations for a short time later in the morning. The afternoon and evening will be dry and clear. Strong northerly winds leading to a significant wind chill.
Chance of cloud-free hill tops
20% initially, becoming 90% into the afternoon.
Maximum wind speed expected
Northerly 30 mph.
Temperature
- At 600m Plus 2 falling to minus 1 Celsius
- Valley Plus 2 rising to 4 Celsius
- Freezing level 900 metres in the early hours, gradually falling to 300 metres by mid-afternoon
Low cloud and visibility
Poor on the higher summits in the morning with widespread cloud down to 600 to 900 metres. Excellent visibility with little in the way of summit cloud in the afternoon.
Mountain weather information
Thu 20 Nov
Sunrise:
Sunset:
Dry and sunny. Cold northerly wind.
Fri 21 Nov
Sunrise:
Sunset:
Much of the day will be cold and dry. Rain, preceded by sleet and snow at higher elevations, will spread east in the evening.
Sat 22 Nov
Sunrise:
Sunset:
Cloudy with rain. Drier weather with showers spreading from the west through 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.