Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Generally high confidence for Wednesday and the start of Thursday. Confidence lowers on Thursday afternoon regarding the extent of snowfall due to uncertainties on the track of Storm Goretti.
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 and bright day. Turning cloudier in the evening with rain.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
30% | 30% | 20% | 20% | 20% | 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 |
NW
21
|
NW
20
|
NW
21
|
W
20
|
W
14
|
SW
10
|
| 300m |
W
11
|
W
9
|
W
12
|
W
11
|
SW
7
|
S
3
|
| Valley |
W
9
|
W
7
|
W
10
|
W
10
|
W
7
|
SE
2
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 28 | 27 | 27 | 26 | 18 | 13 |
| 300m | 25 | 22 | 23 | 23 | 14 | 8 |
| Valley | 24 | 21 | 23 | 23 | 16 | 4 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-1°
|
-1°
|
0°
|
0°
|
0°
|
1°
|
| 300m |
1°
|
1°
|
3°
|
3°
|
2°
|
2°
|
| Valley |
2°
|
2°
|
4°
|
4°
|
3°
|
3°
|
| Freezing Level |
400m
|
400m
|
500m
|
500m
|
600m
|
1,200m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-8°
|
-7°
|
-6°
|
-6°
|
-5°
|
-3°
|
| 300m |
-4°
|
-3°
|
-1°
|
-1°
|
-1°
|
1°
|
| Valley |
-2°
|
-1°
|
0°
|
0°
|
0°
|
1°
|
Additional weather information
Meteorologist's view
A cold day with a bitter wind-chill, especially in the morning.
Weather
Mainly cloudy at first with a few snow showers then brightening up but remaining very cold. Turning overcast in the evening with some rain. Fresh to strong northwesterly winds and a bitter wind chill.
Chance of cloud-free hill tops
20% at first and in the evening, 60% during the day.
Low cloud and visibility
Areas of cloud above 500 or 600m, becoming patchy in the morning. Otherwise good visibility, locally poor in any wintry showers. Lower cloud becoming extensive in the evening.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 2.2mm | 2.4mm | 3.2mm |
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
Becoming overcast through the morning with a few spots of light rain or hill snow above 500m, turning more persistent in the afternoon and perhaps falling as snow down to lower levels later, this heavy for a time and with some drifting accumulations possible.
Chance of cloud-free hill tops
40% at first decreasing to less than 10%.
Maximum wind speed expected
Increasing to gusting 40-50mph on summits in the evening
Temperature
- At 600m Zero Celsius decreasing minus 2 Celsius.
- Valley Plus 3 Celsius decreasing 1 Celsius.
- Freezing level 600m decreasing to 300m later.
Low cloud and visibility
Patchy low cloud bases around 500-600m will become extensive and lower down to 300-400m during the afternoon. Visibility becoming a few kilometres below cloud bases but very poor in snow later.
Mountain weather information
Fri 9 Jan
Sunrise:
Sunset:
A cold and bright day after any early sleet and snow clears. Fresh to strong winds.
Sat 10 Jan
Sunrise:
Sunset:
A settled day with some sunny spells. Light to moderate winds.
Sun 11 Jan
Sunrise:
Sunset:
Turning unsettled and very windy with rain spreading in from the west.
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.