Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for unsettled, but lowering for the confidence in the timing detail of worst of the weather.
This evening forecast
Rather cloudy with showers, perhaps wintry across highest tops. Strong southeast summit winds. Freezing level 1000-1100m.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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
Overcast with rain and summit snow at first. Improving to scattered showers and brighter spells mid-morning. Winds initially strong to gale. Freezing level lowering later.
| 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) |
60% | 90% | 90% | 20% | 20% | 20% | 20% | 10% |
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 |
S
26
|
S
30
|
W
20
|
W
15
|
SW
14
|
SW
11
|
SW
11
|
SW
13
|
| 300m |
SE
13
|
S
16
|
SW
11
|
SW
8
|
SW
9
|
W
7
|
SW
7
|
SW
8
|
| Valley |
SE
10
|
S
12
|
W
10
|
W
7
|
W
8
|
W
6
|
SW
6
|
SW
7
|
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 | 34 | 40 | 25 | 21 | 19 | 16 | 16 | 18 |
| 300m | 29 | 34 | 23 | 18 | 17 | 14 | 15 | 18 |
| Valley | 25 | 30 | 23 | 19 | 16 | 13 | 14 | 17 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
4°
|
4°
|
2°
|
2°
|
2°
|
2°
|
1°
|
1°
|
| 300m |
6°
|
6°
|
4°
|
4°
|
5°
|
4°
|
2°
|
2°
|
| Valley |
6°
|
7°
|
5°
|
4°
|
6°
|
5°
|
3°
|
3°
|
| Freezing Level |
1,200m
|
1,300m
|
900m
|
800m
|
800m
|
800m
|
700m
|
700m
|
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°
|
-3°
|
-4°
|
-3°
|
-3°
|
-4°
|
-4°
|
| 300m |
2°
|
2°
|
0°
|
1°
|
2°
|
1°
|
0°
|
-1°
|
| Valley |
3°
|
4°
|
2°
|
2°
|
3°
|
2°
|
0°
|
0°
|
Additional weather information
Meteorologist's view
Difficult conditions in the extensive early morning hill fog, driving rain and later summit snow, coupled with a severe wind chill at height.
Weather
A band of rain and summit snow reaching from the west overnight. A cloudy start to the morning with occasional rain and summit snow. Snow level lowering 700m by mid-morning. Rain and summit snow clearing to a mix of brighter spells and isolated showers from mid-morning, leaving a mainly dry afternoon.
Chance of cloud-free hill tops
10% increasing 75% by late afternoon
Low cloud and visibility
Good becoming moderate or poor in rain, very poor in snow and within cloud with bases extensive at 600m at first, before lifting and breaking mid-morning.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 2.8mm | 24.4mm | 50.4mm |
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
Brighter spells and showers through the morning, then an area of occasionally heavy rain extends from the west from noon. Outbreaks perhaps wintry across higher summits at first. Gale to severe gale summit winds developing later in the day.
Chance of cloud-free hill tops
60% for the morning becoming less than 10% for the afternoon
Maximum wind speed expected
Southeast increasing 50mph with gusts reaching 65mph across most exposed ridges and summits.
Temperature
- At 600m Plus 1 Celsius increasing 4 Celsius later
- Valley Plus 1 Celsius increasing to 10 Celsius for the afternoon
- Freezing level 800-900m lifting above summits by afternoon
Low cloud and visibility
Good becoming moderate or poor in rain, very poor in snow and within cloud with bases becoming extensive at 600m for the afternoon.
Mountain weather information
Sat 6 Dec
Sunrise:
Sunset:
A showery day with outbreaks frequent and heavy at times bringing the risk of hail and thunder. Fresh to strong summit winds. Freezing level above summits.
Sun 7 Dec
Sunrise:
Sunset:
Cloudy with occasional heavy rain at first, clearing to showers and brighter spells during the morning. Winds veering to the southwest and strengthening. Freezing level above summits.
Mon 8 Dec
Sunrise:
Sunset:
Mainly dry and occasionally bright, but risk rain at times early and late in the day. Fresh southwest winds. Freezing level above summits.
Updated at:
Summit specific forecast
Mountain summit forecast map
Loading map…
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.