Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Medium confidence in details of the forecast however timing of clearance of mist and fog on Wednesday morning is more uncertain. Stormy conditions expected on Friday so keep a close eye on the forecast to keep up to date with the latest information.
This evening forecast
Outbreaks of drizzle in the west, further east remaining dry with mist and fog patches forming during the evening, light southerly winds.
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
Morning mist and fog clearing, sunny spells and light winds for the rest of the day.
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 600m) |
10% | 10% | 10% | 10% | 10% | 10% | 10% | 10% |
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
6
|
NW
2
|
NE
4
|
NW
4
|
NW
7
|
NW
7
|
W
9
|
W
9
|
| 300m |
SW
1
|
SE
1
|
W
1
|
SW
2
|
NW
3
|
W
4
|
W
4
|
W
5
|
| Valley |
N
1
|
NE
1
|
W
1
|
W
2
|
W
3
|
W
4
|
W
5
|
W
5
|
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 | 7 | 4 | 5 | 6 | 9 | 10 | 12 | 13 |
| 300m | 3 | 2 | 2 | 5 | 6 | 8 | 10 | 10 |
| Valley | 2 | 2 | 2 | 6 | 7 | 8 | 11 | 10 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
2°
|
1°
|
1°
|
1°
|
2°
|
2°
|
1°
|
1°
|
| 300m |
3°
|
2°
|
3°
|
3°
|
4°
|
5°
|
3°
|
2°
|
| Valley |
3°
|
3°
|
3°
|
3°
|
5°
|
6°
|
3°
|
2°
|
| Freezing Level |
900m
|
900m
|
900m
|
900m
|
800m
|
800m
|
800m
|
800m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
-1°
|
0°
|
-1°
|
-1°
|
-1°
|
-1°
|
-3°
|
-3°
|
| 300m |
2°
|
1°
|
1°
|
2°
|
3°
|
3°
|
1°
|
-1°
|
| Valley |
2°
|
2°
|
2°
|
2°
|
4°
|
4°
|
1°
|
0°
|
Additional weather information
Meteorologist's view
Light winds, feeling cold at height.
Weather
Mist and fog will form overnight and may take some time to clear in the morning, otherwise a bright day with some sunny intervals. Mist likely to form again in the evening period.
Chance of cloud-free hill tops
60% improving to 80% later, low cloud may be slow to clear around western hills.
Low cloud and visibility
Scattered or broken low cloud above 300m at the start of the day in the west, this will slowly lift and clear but patches or periods of low cloud can be expected for much of the day around 600m around western hills. Clear summits and views are more likely for the eastern areas. Visibility will be poor or very poor initially in mist and fog but becoming very good for the main part of the day.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0.2mm | 0.2mm |
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 dry but cloudy start but precipitation soon spreading east over the Brecon Beacons on Thursday morning, perhaps a touch of sleet on the highest hills by late morning, precipitation clearing during the afternoon with some clear spells developing later.
Chance of cloud-free hill tops
20%, low cloud in association with precipitation spreading east.
Maximum wind speed expected
South 25 mph with gusts 35mph.
Temperature
- At 600m Plus 1 Celsius
- Valley Plus 2 Celsius rising to 6 Celsius.
- Freezing level 800m
Low cloud and visibility
Layers of broken cloud soon forming above 300m and thickening during the morning, especially around western hills, perhaps more cloud breaks around the eastern hills. Moderate visibility in the morning with some morning mist likely, visibility will be poor at times in rainfall.
Mountain weather information
Fri 24 Jan
Sunrise:
Sunset:
Strom Eowyn is forecast to affect parts of the country with rain spreading east and gales or severe gales expected to affect the Brecon Beacons. A few brighter spells in the afternoon but gales likely to continue. Freezing level rising above all summits.
Sat 25 Jan
Sunrise:
Sunset:
Feeling very cold but a bright day with some sunny spells. Fresh southwesterly winds continuing.
Sun 26 Jan
Sunrise:
Sunset:
A bright start but some outbreaks of rain expected and light winds initially but chance of further strong winds or gales later.
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.