Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for the mobile nature of the westerly weather patterns through Tuesday then for high pressure extending from the northeast thereafter, but lowering for the transitional timing detail.
This evening forecast
Scattered showers, wintry above 600m, mixed with clear spells. Strong summit winds. Freezing level 600-700m.
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
Isolated showers merging to longer periods of rain from early afternoon. Strong winds.
| 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) |
10% | 10% | 10% | 20% | 40% | 80% | 60% | 70% |
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 |
W
23
|
W
22
|
W
20
|
W
22
|
SW
23
|
SW
25
|
SW
26
|
SW
24
|
| 300m |
W
14
|
W
13
|
SW
11
|
SW
13
|
SW
14
|
SW
16
|
SW
16
|
SW
15
|
| Valley |
W
12
|
W
11
|
W
8
|
W
12
|
SW
13
|
SW
14
|
SW
15
|
SW
12
|
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 | 32 | 31 | 29 | 29 | 31 | 35 | 36 | 34 |
| 300m | 29 | 29 | 25 | 26 | 27 | 31 | 32 | 30 |
| Valley | 28 | 27 | 22 | 26 | 27 | 29 | 31 | 27 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
2°
|
2°
|
2°
|
4°
|
5°
|
5°
|
5°
|
5°
|
| 300m |
4°
|
4°
|
4°
|
6°
|
8°
|
8°
|
8°
|
8°
|
| Valley |
5°
|
5°
|
5°
|
7°
|
8°
|
8°
|
8°
|
8°
|
| Freezing Level |
700m
|
800m
|
800m
|
1,000m
|
1,200m
|
2,200m
|
2,200m
|
2,100m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-5°
|
-4°
|
-4°
|
-2°
|
-1°
|
0°
|
0°
|
0°
|
| 300m |
0°
|
0°
|
0°
|
3°
|
4°
|
4°
|
4°
|
4°
|
| Valley |
1°
|
1°
|
2°
|
4°
|
5°
|
5°
|
5°
|
5°
|
Additional weather information
Meteorologist's view
Potentially hazardous conditions in extensive hill fog, driving rain and a severe wind chill at height through to afternoon.
Weather
Beginning with brighter spells and a few isolated showers, these wintry above around 600-700m. Cloud thickening from the west to bring periods of rain from early afternoon, perhaps turning heavier mid-afternoon, before becoming patchy and light for the evening.
Chance of cloud-free hill tops
75% at dawn becoming 10% for the afternoon
Low cloud and visibility
Good or very good becoming moderate or poor in rain and showers, very poor in early snow showers and within cloud, which becomes extensive from 500m for the afternoon
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 1.4mm | 4.8mm | 39mm |
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
Mainly cloudy with some patchy light rain, this mainly focused across the west of the Park area. Strong summit winds.
Chance of cloud-free hill tops
25% in west 50% in east
Maximum wind speed expected
South or southwest mean 20-30mph, with gusts reaching 45mph across more exposed ridges and summits.
Temperature
- At 600m Plus 5 Celsius increasing 9 Celsius for the afternoon
- Valley Plus 8 Celsius increasing 14 Celsius for the afternoon
- Freezing level Above summits
Low cloud and visibility
Good or very good becoming moderate or poor in rain, very poor within cloud, which will be quite extensive from 500m in west, less so in east..
Mountain weather information
Wed 18 Mar
Sunrise:
Sunset:
Dry with good sunny spells. Light to moderate winds. Freezing level above summits.
Thu 19 Mar
Sunrise:
Sunset:
Dry with good sunny spells. Light to moderate winds. Freezing level above summits.
Fri 20 Mar
Sunrise:
Sunset:
Mainly cloudy with some chance of patchy light rain in the east. Light to moderate winds. Freezing level above 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.