Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for the generally settled and dry conditions, but lower confidence in the cloud detail in the next few days.
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
Dry, with plenty of cloud, and the odd brighter spell.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
<05% | <05% | <05% | <05% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
E
25
|
E
22
|
E
18
|
E
16
|
E
17
|
E
18
|
| 300m |
E
12
|
E
10
|
E
11
|
E
10
|
E
9
|
NE
9
|
| Valley |
E
8
|
E
9
|
E
10
|
E
10
|
E
9
|
E
9
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 37 | 31 | 26 | 23 | 25 | 25 |
| 300m | 24 | 20 | 20 | 18 | 18 | 18 |
| Valley | 17 | 19 | 19 | 19 | 18 | 19 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
1°
|
0°
|
1°
|
1°
|
1°
|
0°
|
| 300m |
3°
|
3°
|
4°
|
4°
|
3°
|
3°
|
| Valley |
4°
|
4°
|
5°
|
4°
|
4°
|
3°
|
| Freezing Level |
700m
|
600m
|
600m
|
600m
|
600m
|
600m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-6°
|
-7°
|
-5°
|
-5°
|
-6°
|
-6°
|
| 300m |
-1°
|
-1°
|
0°
|
0°
|
-1°
|
-1°
|
| Valley |
1°
|
0°
|
1°
|
1°
|
0°
|
0°
|
Additional weather information
Meteorologist's view
Feeling chilly on the summits, with stronger winds through the morning and colder temperatures making wind chill a possibility. There may be some bright spells at times, and with the winds easing in afternoon, conditions for walking may be best then.
Weather
Most staying dry and cloudy by day, with brighter spells appearing most readily in the west. Moderate easterly winds expected, through strong gusts possible across the summits for the morning. The winds easing through the afternoon.
Chance of cloud-free hill tops
80% in west, 60% in east
Low cloud and visibility
Generally good or very good. This may become poor within cloud, with bases 500 and 900m possible at times, most frequently so in the east.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.2mm | 0.2mm | 0.2mm |
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
Staying generally dry with variable cloud and some good sunny spells likely in the morning. Cloud thickening in the afternoon, with a little light rain or drizzle possible overnight.
Chance of cloud-free hill tops
70% increasing 90% for the afternoon
Maximum wind speed expected
East or northeast 15mph, with gusts reaching 30-35mph across the summits in the morning.
Temperature
- At 600m Plus 1 to minus 1 Celsius
- Valley Plus 2 Celsius increasing 6 Celsius for the afternoon
- Freezing level 500-700m
Low cloud and visibility
Good or very good becoming very low within cloud which will be occasional between 500m and 900m by day.
Mountain weather information
Tue 30 Dec
Sunrise:
Sunset:
Dry with brighter spells. Light summit winds. Freezing level 500-700m.
Wed 31 Dec
Sunrise:
Sunset:
Bright and dry by day. Turning rather cloudy during the evening. Light summit winds. Freezing level 500-600m.
Thu 1 Jan
Sunrise:
Sunset:
Cloudy with some patchy light rain, wintry across highest peaks. Fresh to strong summit winds. Freezing level 300-500m, lifting to 800-1000m later in the day.
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.