Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High overall.
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.
Mountain weather forecast
Rain clearing during the morning leaving a dry afternoon with some sunny spells, with fresh easterly winds. Perhaps some further light rain or drizzle in the evening.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
70% | 20% | <05% | <05% | 20% | 40% |
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
20
|
SE
19
|
SE
18
|
E
13
|
E
15
|
E
15
|
| 300m |
E
10
|
SE
7
|
E
7
|
E
6
|
E
7
|
E
7
|
| Valley |
E
9
|
SE
6
|
E
6
|
E
6
|
E
6
|
E
6
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 26 | 25 | 23 | 18 | 22 | 21 |
| 300m | 21 | 16 | 14 | 13 | 16 | 16 |
| Valley | 21 | 14 | 14 | 14 | 15 | 15 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
7°
|
6°
|
5°
|
5°
|
5°
|
5°
|
| 300m |
8°
|
7°
|
8°
|
7°
|
6°
|
7°
|
| Valley |
9°
|
8°
|
8°
|
8°
|
7°
|
7°
|
| Freezing Level |
1,700m
|
1,400m
|
1,200m
|
1,200m
|
1,200m
|
1,500m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
2°
|
1°
|
0°
|
1°
|
0°
|
1°
|
| 300m |
6°
|
5°
|
6°
|
5°
|
4°
|
5°
|
| Valley |
7°
|
7°
|
7°
|
6°
|
5°
|
6°
|
Additional weather information
Meteorologist's view
After a cloudy morning with poor visibility in the hills, conditions will improve for a few hours of daylight in the afternoon, soggy underfoot with watercourses already full.
Weather
Rain will continue for a time through the morning, cloud will slowly lift and break. During the afternoon brighter spells will develop towards western hills, remaining cloudier in the east, cloud is likely to thicken in the evening enough in the evening for some further rain or drizzle.
Chance of cloud-free hill tops
40% rising to 80%, 60% during the evening.
Low cloud and visibility
Layers of broken low cloud above 300m in the early morning will slowly lift during the morning but is unlikely to clear the summits until early afternoon. The best chance of clear summits will be in the west where cloud will become patchy. Areas of broken low cloud above 400m returning during the evening. Visibility will be moderate under the cloud and in any drizzle but will become good at times during the afternoon.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 8.2mm | 13.2mm | 17.2mm |
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
A cloudy day with a lot of mist and fog and low cloud around, the best conditions will be towards western hills. Intermittent drizzle in the morning but mostly dry in the afternoon. Feeling very chilly by the end of the day in strong northeasterly winds.
Chance of cloud-free hill tops
20% improving to 60% at times in the afternoon, best chance in the west.
Maximum wind speed expected
Northeasterly 20 gust 25-30 mph.
Temperature
- At 600m Plus 3 falling to zero Celsius.
- Valley Plus 8 Celsius.
- Freezing level Above all summits but lowering in the evening to 600m
Low cloud and visibility
Layers of broken cloud above 200m in the east, cloud more scattered above 300m in the west, cloud will lift a little in the afternoon but unlikely to clear summits during the day. Visibility will be moderate or poor in drizzle at times during the day but mainly good in the west.
Mountain weather information
Wed 24 Dec
Sunrise:
Sunset:
Cloudy at first but becoming brighter with strong easterly winds, sunny spells developing in the west, feeling very cold on the hills with a significant windchill expected.
Thu 25 Dec
Sunrise:
Sunset:
A bitterly cold day with fresh or strong easterly winds but a lot of bright and dry weather for Christmas walks.
Fri 26 Dec
Sunrise:
Sunset:
The cold east or northeasterly conditions continuing with some bright spells and fresh winds.
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.