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.
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 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
80% | 50% | 30% | 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 |
SW
18
|
W
17
|
W
17
|
W
13
|
SW
12
|
SW
13
|
| 300m |
SW
11
|
W
9
|
W
10
|
W
7
|
SW
7
|
SW
8
|
| Valley |
SW
9
|
W
8
|
W
9
|
W
7
|
SW
6
|
SW
7
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 24 | 23 | 22 | 17 | 18 | 19 |
| 300m | 23 | 19 | 19 | 16 | 16 | 18 |
| Valley | 22 | 19 | 19 | 16 | 15 | 16 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
3°
|
2°
|
2°
|
2°
|
1°
|
1°
|
| 300m |
5°
|
4°
|
5°
|
4°
|
3°
|
3°
|
| Valley |
6°
|
5°
|
6°
|
5°
|
4°
|
3°
|
| Freezing Level |
1,100m
|
800m
|
800m
|
700m
|
700m
|
700m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-2°
|
-4°
|
-4°
|
-3°
|
-4°
|
-4°
|
| 300m |
2°
|
1°
|
1°
|
1°
|
0°
|
-1°
|
| Valley |
3°
|
2°
|
2°
|
2°
|
1°
|
0°
|
Additional weather information
Meteorologist's view
Difficult conditions in the extensive early morning hill fog, wet conditions with possible flooded waterways and paths, coupled with a significant wind chill at height.
Weather
Cloudy with outbreaks of rain and summit sleet this morning, these perhaps heavy at times. Early afternoon mostly dry conditions, with broken cloud, arrive from the south, with just a small chance of an isolated shower.
Chance of cloud-free hill tops
30% increasing 95% by late afternoon
Low cloud and visibility
Good becoming moderate or poor in rain and sleet, very poor 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 |
|---|---|---|
| 3.8mm | 11mm | 48.6mm |
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 some clear spells overnight, but overall cloud is likely to increase leading to a cloud morning. Rain will soon arrive from the west in the afternoon, becoming heavy for much of the time before clearing to broken cloud and heavy showers in the evening, with a chance of hail and thunder.
Chance of cloud-free hill tops
60% for the morning becoming less than 10% for the afternoon. Then 70% for the evening.
Maximum wind speed expected
Southeast increasing 50mph with gusts reaching 65mph across most exposed ridges and summits.
Temperature
- At 600m Plus 2 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 and showers, very poor within cloud with bases becoming extensive at 600m for the afternoon. The cloud becomes broken through the evening, with bases around 600m still.
Mountain weather information
Sat 6 Dec
Sunrise:
Sunset:
Frequent and heavy showers with a chance of hail and thunder, the showers easing through the afternoon. Fresh to strong summit winds gradually easing. Freezing level above summits.
Sun 7 Dec
Sunrise:
Sunset:
Rain, occasionally heavy rain, soon arriving then clearing to isolated showers and brighter spells during the afternoon. 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
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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.