Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
A dry and settled day on Tuesday before a return to unsettled, wet conditions on Wednesday and Thursday, with strong southwesterly winds and some localised flooding possible. Uncertainty towards the end of the week but strong winds and further rain likely.
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
A dry and bright day with sunny spells and mainly light winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
40% | 20% | 10% | 10% | 10% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
N
12
|
N
12
|
NW
9
|
NW
8
|
W
5
|
SW
7
|
| 300m |
N
5
|
NW
3
|
NW
5
|
W
4
|
SW
3
|
SW
5
|
| Valley |
N
3
|
NW
2
|
W
5
|
W
4
|
W
3
|
S
4
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 15 | 15 | 12 | 11 | 8 | 9 |
| 300m | 10 | 9 | 9 | 9 | 5 | 8 |
| Valley | 10 | 7 | 9 | 9 | 5 | 7 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
4°
|
3°
|
4°
|
3°
|
2°
|
2°
|
| 300m |
6°
|
5°
|
6°
|
6°
|
2°
|
2°
|
| Valley |
6°
|
6°
|
7°
|
6°
|
3°
|
3°
|
| Freezing Level |
1,300m
|
1,000m
|
1,000m
|
900m
|
900m
|
800m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
0°
|
-1°
|
0°
|
0°
|
0°
|
-1°
|
| 300m |
4°
|
4°
|
5°
|
4°
|
1°
|
0°
|
| Valley |
5°
|
5°
|
6°
|
5°
|
1°
|
1°
|
Additional weather information
Meteorologist's view
Nothing to add.
Weather
Cloudy initially on Tuesday morning with some light rain or drizzle affecting eastern areas including the Black Mountains. Turning dry with cloud and any early morning mist clearing to allow plenty of winter sunshine. Still feeling cool out on the hills.
Chance of cloud-free hill tops
50% at first becoming 80% or more by mid-morning
Low cloud and visibility
Scattered to broken bases 700m at first across eastern areas at first before lifting and breaking during the morning. Good or very good visibility expected, but poor in any early mist.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 19.2mm | 25.2mm | 25.4mm |
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
Dry and frosty overnight but low cloud gathering as a band of rain spreads across the Brecon Beacons during the morning, becoming persistent and heavy at times during the afternoon. The rain will be accompanied by strong southerly winds, with summit gales likely. Rain easing during the late evening, towards midnight.
Chance of cloud-free hill tops
80% falling to 20% or less associated with rain.
Maximum wind speed expected
Southerly 30-40mph with gusts 50mph in early afternoon.
Temperature
- At 600m Plus 1 rising to 7 degrees Celsius.
- Valley Plus 6 Celsius rising to 11 degrees Celsius.
- Freezing level Near summits at first rising well above by early afternoon.
Low cloud and visibility
Scattered or broken bases around 600m during the morning will lower during the day, particularly around western hills. Cloud becoming overcast around 300m by the afternoon. Visibility will be good around dawn but becoming moderate or poor in rain.
Mountain weather information
Thu 18 Dec
Sunrise:
Sunset:
Rain expected to continue overnight and into Thursday with extensive low cloud. Rain will be persistent and heavy at times with some flooding of small watercourses and access roads possible. Strong southerly or south-westerly winds expected. Rain clearing later with a cold night expected.
Fri 19 Dec
Sunrise:
Sunset:
A cold start and a drier day with sunny spells, strong southwesterly winds. Freezing level just above summits.
Sat 20 Dec
Sunrise:
Sunset:
Strong southwesterly winds, risk of gales, bands of rain likely, low risk of wintry precipitation.
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.