Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence for unsettled start, medium to low confidence for the detail from Wednesday.
This evening forecast
Occasional showers with snow level 700m. Severe wind chill at height in fresh to strong summit 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
Showers. Rather cloudy. Strong summit 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) |
40% | 40% | 40% | 70% | 60% | 40% | 40% | 40% |
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
24
|
W
25
|
W
25
|
W
26
|
W
22
|
NW
18
|
| 300m |
W
13
|
W
12
|
W
14
|
W
15
|
W
15
|
W
17
|
W
12
|
W
9
|
| Valley |
W
11
|
W
11
|
W
13
|
W
13
|
W
15
|
W
15
|
W
10
|
W
8
|
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 | 31 | 30 | 33 | 34 | 34 | 34 | 31 | 25 |
| 300m | 29 | 27 | 29 | 30 | 30 | 32 | 26 | 20 |
| Valley | 28 | 27 | 28 | 29 | 31 | 32 | 24 | 19 |
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°
|
1°
|
1°
|
2°
|
3°
|
3°
|
2°
|
| 300m |
5°
|
4°
|
4°
|
4°
|
5°
|
6°
|
5°
|
4°
|
| Valley |
5°
|
5°
|
4°
|
5°
|
6°
|
7°
|
6°
|
5°
|
| Freezing Level |
900m
|
800m
|
700m
|
700m
|
800m
|
900m
|
900m
|
800m
|
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°
|
-6°
|
-4°
|
-4°
|
-4°
|
-4°
|
| 300m |
1°
|
0°
|
-1°
|
-1°
|
1°
|
1°
|
1°
|
1°
|
| Valley |
2°
|
1°
|
0°
|
1°
|
2°
|
3°
|
2°
|
2°
|
Additional weather information
Meteorologist's view
Winds 10-15mph stronger than the speeds above across most exposed ridges and summits. Difficult conditions during the late morning at height in quite extensive hill fog, driving snow and a severe wind chill.
Weather
A rather cloudy day with showers with a snow level around 600-700m. Showers frequent and occasionally heavy for the late morning, before easing mid-afternoon as a few brighter spells develop.
Chance of cloud-free hill tops
30% becoming 60% late afternoon
Low cloud and visibility
Visibility becoming moderate or poor in rain showers, very poor in snow showers and within cloud with bases quite extensive from 500m at first, before lifting and breaking later in the day.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 13.6mm | 14.4mm | 22.4mm |
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 with occasional brighter spells breaking through the veil of higher cloud. Moderate to fresh summit winds easing for the afternoon.
Chance of cloud-free hill tops
90% plus
Maximum wind speed expected
North or northwest beginning 15-20mph with gusts reaching 30mph across more exposed ridges and summits, gradually easing from late morning.
Temperature
- At 600m Zero to Minus 1 Celsius
- Valley Plus 1 Celsius increasing 7 Celsius during the afternoon
- Freezing level 400-600m
Low cloud and visibility
Visibility very good or excellent.
Mountain weather information
Wed 18 Feb
Sunrise:
Sunset:
Cloudy with occasional snow and low level rain. East to southeast summit winds strong.
Thu 19 Feb
Sunrise:
Sunset:
Early patchy snow and rain, then dry with bright and sunny spells increasing for the afternoon. Freezing level lifting to around 600m. Fresh summit winds.
Fri 20 Feb
Sunrise:
Sunset:
Showers or longer periods of rain and initially summit snow. Strong summit winds.
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.