Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for unsettled and changeable conditions during this period with potential for stormy conditions on Tuesday. Low confidence for wind and rain details from Tuesday.
This evening forecast
Clear spells and a few passing showers. Strong westerly winds on the tops. Freezing level above summits.
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.
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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.
Mountain weather forecast
Wet and windy with low cloud during the day.
| 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) |
20% | 20% | 70% | 90% | >95% | 70% | 20% | 20% |
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 |
SW
19
|
S
17
|
SE
19
|
S
21
|
SW
28
|
SW
32
|
W
28
|
SW
23
|
| 300m |
SW
10
|
S
6
|
SE
8
|
S
10
|
SW
17
|
SW
19
|
W
16
|
SW
13
|
| Valley |
SW
9
|
S
4
|
E
3
|
SE
4
|
SW
13
|
SW
16
|
W
14
|
SW
11
|
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 | 25 | 21 | 26 | 27 | 36 | 43 | 38 | 31 |
| 300m | 24 | 15 | 20 | 23 | 34 | 39 | 34 | 28 |
| Valley | 24 | 13 | 9 | 15 | 32 | 38 | 32 | 26 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
6°
|
7°
|
8°
|
8°
|
10°
|
9°
|
7°
|
7°
|
| 300m |
8°
|
8°
|
9°
|
10°
|
12°
|
11°
|
9°
|
9°
|
| Valley |
8°
|
9°
|
9°
|
10°
|
12°
|
12°
|
10°
|
9°
|
| Freezing Level |
1,600m
|
2,400m
|
2,300m
|
2,800m
|
2,900m
|
2,300m
|
1,700m
|
1,400m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
1°
|
3°
|
3°
|
4°
|
6°
|
4°
|
2°
|
2°
|
| 300m |
5°
|
7°
|
7°
|
8°
|
9°
|
8°
|
6°
|
6°
|
| Valley |
6°
|
8°
|
8°
|
9°
|
10°
|
9°
|
7°
|
7°
|
Additional weather information
Meteorologist's view
Gusts of 40 to 50mph above 600m in the afternoon. Arduous and difficult conditions with a chance of being blown off balance. Streams crossings may be impassable.
Weather
Clear spells at midnight then outbreaks of light rain arriving by dawn. A wet day with spells of rain or drizzle, turning heavy at times but lighter during the afternoon. Rain clearing soon after dark then dry with clear spells in the evening. Strong winds developing with summit gales in the afternoon.
Chance of cloud-free hill tops
Nil chance for much of the day, then becoming 70% in the evening.
Low cloud and visibility
Patchy low cloud on the tops becoming extensive and lowering overnight. Cloud and fog extensive above 300m for most of the day bringing difficult navigation conditions. Cloud slowly lifting and breaking up after dark.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 7.8mm | 21.6mm | 24.4mm |
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
Clear or sunny spells with occasional bands of showers moving east, some heavy with a small chance of hail and thunder. More persistent rain spreading north during the evening.
Chance of cloud-free hill tops
70%.
Maximum wind speed expected
South or Southwest 20 to 30mph with gusts 40mph.
Temperature
- At 600m Plus 5 or 6C.
- Valley Plus 8C rising to 11C.
- Freezing level Above summits.
Low cloud and visibility
Patchy cloud above 500 or 600m, mainly as bands of showers move through. Mostly good visibility between showers.
Mountain weather information
Tue 9 Dec
Sunrise:
Sunset:
Very windy conditions with severe gale force winds likely for a time. A period of heavy rain in the morning followed by bright spells and showers. Freezing level above summits.
Wed 10 Dec
Sunrise:
Sunset:
Bright spells and showers. Very strong and gusty westerly winds with severe gales at height. Freezing level above summits.
Thu 11 Dec
Sunrise:
Sunset:
A window of drier and brighter weather with lighter winds is possible. Low confidence.
Updated at:
Summit specific forecast
Mountain summit forecast map
Loading map…
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.