Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for general developments. Medium for cloud and temperature inversion
This evening forecast
Low cloud. Temperature inversion with clear 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.
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
Low cloud. Temperature inversion. Bright or sunny spells.
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 600m) |
00% | <05% | <05% | <05% | <05% | <05% | 00% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
S
16
|
S
14
|
S
14
|
S
12
|
S
12
|
S
6
|
SE
9
|
SE
9
|
| 300m |
S
5
|
S
4
|
S
4
|
SE
3
|
SE
3
|
N
3
|
SE
2
|
W
3
|
| Valley |
SE
2
|
SE
2
|
SE
2
|
E
3
|
NE
2
|
N
2
|
NE
3
|
N
3
|
Wind gust (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m | 23 | 20 | 18 | 17 | 15 | 7 | 11 | 11 |
| 300m | 12 | 11 | 10 | 8 | 7 | 5 | 4 | 4 |
| Valley | 4 | 4 | 3 | 5 | 5 | 5 | 4 | 5 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
1°
|
0°
|
0°
|
0°
|
2°
|
4°
|
2°
|
1°
|
| 300m |
1°
|
1°
|
0°
|
0°
|
2°
|
4°
|
0°
|
-1°
|
| Valley |
2°
|
1°
|
0°
|
0°
|
3°
|
4°
|
0°
|
0°
|
| Freezing Level |
1,200m
|
400m
|
300m
|
300m
|
1,000m
|
1,100m
|
1,000m
|
300m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
-5°
|
-6°
|
-5°
|
-5°
|
-2°
|
2°
|
-2°
|
-2°
|
| 300m |
-2°
|
-1°
|
-2°
|
-2°
|
0°
|
2°
|
-2°
|
-2°
|
| Valley |
0°
|
-1°
|
-1°
|
-1°
|
1°
|
3°
|
-2°
|
-2°
|
Additional weather information
Meteorologist's view
Some uncertainty around the temperature inversion, but potential for stunning views over the summits. Caution around summit temperatures and overall freezing level due to inversion.
Weather
Low cloud rather extensive overnight and through the morning, perhaps a little drizzle on windward slopes. However, a marked temperature inversion is possible around 600m, although some uncertainty around this. This will could lead to the higher summits being mostly sunny or clear. The cloud also tending to lift and break more widely during the afternoon and evening.
Chance of cloud-free hill tops
70%
Low cloud and visibility
Occasional or extensive low cloud, base 300m or less, but capped around 600m due to temperature inversion, perhaps patches or clear later. Visibility moderate to very poor in cloud, otherwise very good.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0mm | 0.6mm |
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
Similar conditions to Saturday with variable low cloud and some sunny or clear conditions. A temperature inversion is again possible, particularly early in the day.
Chance of cloud-free hill tops
70%
Maximum wind speed expected
South or Southwest 10mph.
Temperature
- At 600m Minus 2 Celsius to Plus 2 Celsius
- Valley Minus 1 Celsius rising to 6 Celsius
- Freezing level Well down at first, but mainly towards the summits although complicated by a temperature inversion.
Low cloud and visibility
Occasional or extensive low cloud, base around 300m but possibly capped below the summits due to temperature inversion. Visibility moderate to very poor in cloud, otherwise very good.
Mountain weather information
Mon 20 Jan
Sunrise:
Sunset:
Patchy low cloud, but mainly bright. Some sunny or clear spells. Light winds at height.
Tue 21 Jan
Sunrise:
Sunset:
Occasional low cloud, mist and valley fog. Bright, sunny or clear spells. Moderate southeast winds at height. Freezing level around the summits, perhaps lowering overnight.
Wed 22 Jan
Sunrise:
Sunset:
Cloudy or bright. Rain possible later, perhaps wintry over the summits. Fresh to strong east or southeast winds at height with a significant wind chill. Freezing level near or above the 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.