Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for the mobile nature of the westerly weather pattern, but lowering for the transitional timing detail.
This evening forecast
Overcast with some patchy light rain. Moderate summit winds. Freezing level above 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.
Mountain weather forecast
Rain for much of the day, clearing to showers around late afternoon. Moderate winds. Freezing level lowering later in the day.
| 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) |
70% | 70% | 90% | 90% | 90% | 40% | 20% | 30% |
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
14
|
SW
15
|
SW
17
|
SW
21
|
SW
18
|
NW
16
|
NW
12
|
NW
12
|
| 300m |
SW
9
|
SW
9
|
SW
10
|
SW
13
|
SW
13
|
W
11
|
W
7
|
W
6
|
| Valley |
SW
8
|
SW
8
|
SW
8
|
SW
10
|
SW
12
|
W
10
|
W
6
|
W
6
|
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 | 20 | 22 | 23 | 27 | 24 | 22 | 17 | 17 |
| 300m | 20 | 20 | 21 | 26 | 24 | 21 | 15 | 14 |
| Valley | 19 | 19 | 20 | 24 | 24 | 20 | 15 | 14 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
4°
|
5°
|
6°
|
7°
|
7°
|
6°
|
4°
|
2°
|
| 300m |
6°
|
7°
|
7°
|
9°
|
10°
|
8°
|
7°
|
5°
|
| Valley |
6°
|
7°
|
8°
|
9°
|
10°
|
9°
|
7°
|
6°
|
| Freezing Level |
1,600m
|
1,700m
|
1,600m
|
1,900m
|
2,000m
|
1,800m
|
1,000m
|
800m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
0°
|
1°
|
2°
|
2°
|
3°
|
2°
|
0°
|
-2°
|
| 300m |
3°
|
4°
|
4°
|
6°
|
7°
|
5°
|
4°
|
2°
|
| Valley |
4°
|
5°
|
6°
|
7°
|
8°
|
6°
|
5°
|
3°
|
Additional weather information
Meteorologist's view
Navigation very difficult for much of the day in rain and extensive hill fog.
Weather
Overcast through much of the day with periods of light to moderate rain. Rain clearing erratically to showers and brighter spells towards late afternoon. Showers continuing through the evening and turning to snow above 500m.
Chance of cloud-free hill tops
10% becoming 50% for late afternoon
Low cloud and visibility
Good or very good becoming moderate or poor in rain, very poor in snow and within cloud with bases extensive from 400m at first before lifting and breaking erratically during the late afternoon.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 10.4mm | 11.8mm | 11.8mm |
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
Cloudy start with showers or longer periods of rain, initially snow above 600m. Showers dwindling through the afternoon and evening. Strong summit winds.
Chance of cloud-free hill tops
30% becoming 75% for the afternoon
Maximum wind speed expected
West or northwest 20-30mph with gusts reaching 40-45mph across exposed ridges and summits.
Temperature
- At 600m Zero to plus 1 Celsius increasing plus 4 Celsius for the afternoon
- Valley Plus 2 Celsius increasing 10 Celsius for the afternoon
- Freezing level 600-700m at dawn, lifting above summits by late morning
Low cloud and visibility
Good becoming moderate or poor in rain, very poor in snow and within cloud with bases quite extensive from 500m at first before lifting and breaking for the afternoon.
Mountain weather information
Sun 29 Mar
Sunrise:
Sunset:
Isolated showers merging to longer periods of rain and summit sleet either side of noon. Strong summit winds. Freezing level above summits.
Mon 30 Mar
Sunrise:
Sunset:
Cloudy to overcast with patchy light rain or drizzle. Fresh to strong winds. Freezing level above the summits.
Tue 31 Mar
Sunrise:
Sunset:
Overcast with patchy light rain. Fresh or strong winds. Freezing level above the summits.
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.