Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence in the unsettled conditions continuing the rest of this week, but considerable uncertainty on the extent of rainfall expected this weekend.
This evening forecast
Low cloud and showery outbreaks of rain this evening will gradually clear away. Strong winds at height.
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.
Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
Mountain weather forecast
Bright but windy day with gales at height and occasional showers.
| 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% | 30% | 40% | 40% | 30% | 30% | 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
21
|
SW
25
|
SW
25
|
SW
23
|
SW
23
|
SW
18
|
SW
17
|
SW
17
|
| 300m |
SW
12
|
SW
14
|
SW
15
|
SW
14
|
SW
14
|
SW
12
|
SW
10
|
SW
9
|
| Valley |
SW
10
|
SW
11
|
SW
12
|
SW
12
|
SW
11
|
SW
10
|
SW
8
|
SW
7
|
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 | 31 | 35 | 34 | 32 | 31 | 25 | 24 | 24 |
| 300m | 27 | 31 | 31 | 30 | 28 | 24 | 22 | 20 |
| Valley | 26 | 27 | 29 | 28 | 25 | 23 | 21 | 19 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
3°
|
4°
|
4°
|
4°
|
5°
|
5°
|
4°
|
4°
|
| 300m |
5°
|
5°
|
6°
|
6°
|
8°
|
7°
|
6°
|
6°
|
| Valley |
5°
|
6°
|
6°
|
7°
|
8°
|
7°
|
6°
|
6°
|
| Freezing Level |
900m
|
1,000m
|
1,100m
|
1,100m
|
1,200m
|
1,200m
|
1,200m
|
1,200m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-3°
|
-3°
|
-2°
|
-2°
|
0°
|
0°
|
-1°
|
-1°
|
| 300m |
1°
|
1°
|
2°
|
2°
|
4°
|
4°
|
3°
|
3°
|
| Valley |
2°
|
3°
|
3°
|
3°
|
5°
|
5°
|
4°
|
4°
|
Additional weather information
Meteorologist's view
Windy conditions will make for fairly arduous walking on exposed terrain with buffeting of clothing and significant wind chill. Recent rainfall will make for very wet underfoot conditions and swollen watercourses.
Weather
A blusterly day with a few showers, possibly heavy with hail and the odd rumble of thunder in the morning. Best of the sunnier spells in the afternoon.
Chance of cloud-free hill tops
80%
Low cloud and visibility
Visibility will be generally good, but occasionally deteriorating to a few kilometres or worse in showers.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 2mm | 4.6mm | 27.8mm |
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 mainly dry day with some sunshine but also a few patches of hill fog which may linger. Cloud will tend to increase later and bring the risk of showery rain late afternoon or evening. Remaining windy with gales at height.
Chance of cloud-free hill tops
60%
Maximum wind speed expected
Gusting 35-40mph on summits and ridges.
Temperature
- At 600m Plus 5 Celsius.
- Valley Plus 6 rising 9 Celsius.
- Freezing level Above summits.
Low cloud and visibility
A few patches of low cloud with bases around summit level lingering, but some clear breaks too. Good visibility otherwise.
Mountain weather information
Sun 21 Dec
Sunrise:
Sunset:
Cloudy with outbreaks of rain, possibly heavy at times. Strong summit winds. Freezing level above summits.
Mon 22 Dec
Sunrise:
Sunset:
Another rather cloudy day with spells of rain, but some drier, brighter conditions developing. Moderate to fresh summit winds and freezing level above summits.
Tue 23 Dec
Sunrise:
Sunset:
Variable amounts of cloud and generally dry. Moderate to fresh summit winds and freezing level above summits.
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.