Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for east to southeast flow persisting also for occasionally unsettled, but lowering for timing detail of worst of conditions.
This evening forecast
Cloudy with occasional light rain and summit snow. Cold in strong easterly summit winds. Freezing level 800-900m
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
Overcast with periods of snow and rain. Severe wind chill. Summit winds strong at first.
| 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) |
90% | 80% | 80% | 80% | 80% | 80% | 80% | 80% |
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 |
E
25
|
E
22
|
E
22
|
E
21
|
E
18
|
E
15
|
E
12
|
E
10
|
| 300m |
E
14
|
E
12
|
E
12
|
E
12
|
E
12
|
E
10
|
E
8
|
E
6
|
| Valley |
E
13
|
E
10
|
E
11
|
E
11
|
E
11
|
E
9
|
E
7
|
E
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 | 35 | 32 | 31 | 29 | 25 | 23 | 18 | 15 |
| 300m | 30 | 25 | 24 | 23 | 21 | 18 | 15 | 13 |
| Valley | 29 | 22 | 23 | 24 | 21 | 17 | 13 | 12 |
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°
|
1°
|
1°
|
1°
|
1°
|
1°
|
| 300m |
5°
|
4°
|
4°
|
3°
|
3°
|
3°
|
2°
|
2°
|
| Valley |
6°
|
5°
|
5°
|
4°
|
4°
|
4°
|
3°
|
2°
|
| Freezing Level |
900m
|
1,000m
|
1,000m
|
700m
|
600m
|
600m
|
600m
|
700m
|
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°
|
-6°
|
-5°
|
-5°
|
-4°
|
-4°
|
| 300m |
0°
|
0°
|
0°
|
-1°
|
-1°
|
-1°
|
-2°
|
-2°
|
| Valley |
2°
|
2°
|
1°
|
0°
|
0°
|
0°
|
0°
|
-1°
|
Additional weather information
Meteorologist's view
Be prepared for winter conditions at height with snow and severe wind chill. Low cloud will bring navigational difficulties.
Weather
A cloudy to overcast day with periods of snow and rain, focused across eastern areas of the Park. Snow level 800m at dawn, lowering 400m from mid-day.
Chance of cloud-free hill tops
10-20%
Low cloud and visibility
Moderate or poor in rain, very poor in snow and within cloud with bases extensive from around 500m
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.6mm | 8mm | 27.8mm |
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
A few light showers appearing. Cloudy start, then brighter spells developing for the afternoon. Continuing cold in the fresh to strong summit winds.
Chance of cloud-free hill tops
20% becoming 60% for the afternoon
Maximum wind speed expected
Easterly increasing 20-30mph by late afternoon with gusts reaching 40mph across more exposed ridges and summits.
Temperature
- At 600m Plus 2 Celsius increasing plus 5 Celsius by late afternoon
- Valley Plus 3 rising to 9 Celsius for the afternoon
- Freezing level 800m lifting above summits for the afternoon
Low cloud and visibility
Moderate or poor in rain, very poor in snow and within cloud with bases extensive from around 500m at first, before lifting and breaking for the afternoon.
Mountain weather information
Thu 5 Feb
Sunrise:
Sunset:
Periods of rain and summit snow. Strong easterly summit winds.
Fri 6 Feb
Sunrise:
Sunset:
Patchy rain and summit snow. Fresh or strong summit winds.
Sat 7 Feb
Sunrise:
Sunset:
Occasional rain and summit snow, most persistent in the east. Moderate easterly 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.