Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
A cold period of weather, wintery on the hills at times. Strong winds will enhance the wind chill for the midweek period, becoming slightly milder towards the weekend. Low confidence in details of the milder air arriving by the weekend. Keep an eye on the most up to date forecasts.
This evening forecast
Showers continuing through the evening, rain at first but turning increasing wintery as freezing level lowers to 600m later in the evening. Strong northerly winds will make it feel bitterly cold on the hills with a significant and severe windchill expected.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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
Dry, bright and sunny conditions expected in daylight hours, strong northerly winds continuing, enhancing the very cold feel. Visibility generally very good in the wintry conditions.
| 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) |
40% | 50% | 50% | 20% | 20% | 10% | 00% | 00% |
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
21
|
N
25
|
N
26
|
N
23
|
N
24
|
N
21
|
NW
18
|
NW
15
|
| 300m |
NW
9
|
NW
13
|
N
14
|
N
9
|
N
13
|
N
11
|
NW
7
|
NW
5
|
| Valley |
NW
8
|
NW
12
|
N
13
|
N
8
|
N
12
|
N
10
|
NW
7
|
W
5
|
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 | 27 | 32 | 34 | 30 | 31 | 27 | 26 | 21 |
| 300m | 21 | 28 | 30 | 21 | 26 | 22 | 19 | 13 |
| Valley | 21 | 27 | 30 | 22 | 26 | 22 | 19 | 13 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
2°
|
0°
|
-1°
|
-2°
|
0°
|
0°
|
-2°
|
-2°
|
| 300m |
4°
|
2°
|
1°
|
1°
|
3°
|
2°
|
0°
|
-1°
|
| Valley |
4°
|
3°
|
1°
|
2°
|
4°
|
3°
|
0°
|
0°
|
| Freezing Level |
800m
|
500m
|
300m
|
300m
|
300m
|
200m
|
0m
|
0m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-4°
|
-7°
|
-9°
|
-9°
|
-8°
|
-7°
|
-9°
|
-9°
|
| 300m |
0°
|
-2°
|
-5°
|
-3°
|
-2°
|
-2°
|
-4°
|
-4°
|
| Valley |
2°
|
-1°
|
-3°
|
-2°
|
-1°
|
-1°
|
-3°
|
-3°
|
Additional weather information
Meteorologist's view
Bitterly cold overnight and for the start to the day, with a significant windchill factor. Freezing level will fall to surface level with any snow accumulations likely to stay.
Weather
Snowfall in the early hours will lead to some accumulations, however precipitation will clear and winds will begin to ease during the early hours. Skies will clear towards dawn. During daylight hours dry, bright conditions with a few sunny spells can be expected, winds will continue to be strong with a very cold feel to the day. Skies remaining clear into the evening with a severe frost expected.
Chance of cloud-free hill tops
90%, early patchy cloud will lift and clear.
Low cloud and visibility
Patchy cloud around 600m initially, this will lift and clear during the morning with very little cloud cover during daylight hours. Visibility will be good and become excellent at times.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.8mm | 0.8mm | 1mm |
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
A hard frost overnight and in the morning and fresh north or northwesterly winds continuing. Otherwise becoming a bright and sunny day but some cloudy at times.
Chance of cloud-free hill tops
95%, patchy cloud around summits in the afternoon.
Maximum wind speed expected
Northerly 15-20 mph gusts 25mph.
Temperature
- At 600m Minus 4 rising to Minus 1.
- Valley Minus 3 rising to Plus 3 Celsius.
- Freezing level 200m.
Low cloud and visibility
Perhaps some patchy cloud around 600m at times. Very good or excellent visibility expected.
Mountain weather information
Fri 21 Nov
Sunrise:
Sunset:
Remaining cold in the northerly airflow, otherwise dry, bright and sunny, light northwesterly winds backing southwesterly later in the day. Freezing level 200m rising to 500m.
Sat 22 Nov
Sunrise:
Sunset:
Southerly winds will introduce milder air and some precipitation, the mix of snow/sleet and rain is uncertain at this time. Freezing rising above all summits.
Sun 23 Nov
Sunrise:
Sunset:
Expected to remain chilly with cloudier conditions and westerly winds, low confidence in the detail for later in the weekend.
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.