Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for general developments. Medium for cloud details.
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
Cloudy. Windy. Rain and drizzle developing.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
20% | 30% | 40% | 70% | 70% | 30% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
S
28
|
S
28
|
S
24
|
SW
16
|
W
8
|
W
8
|
| 300m |
S
12
|
S
13
|
S
12
|
SW
8
|
W
4
|
SW
5
|
| Valley |
S
7
|
S
8
|
S
9
|
SW
6
|
W
4
|
W
3
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 35 | 36 | 31 | 20 | 11 | 12 |
| 300m | 29 | 31 | 26 | 16 | 9 | 11 |
| Valley | 22 | 24 | 22 | 14 | 8 | 10 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
6°
|
6°
|
7°
|
7°
|
5°
|
4°
|
| 300m |
8°
|
9°
|
10°
|
9°
|
7°
|
7°
|
| Valley |
9°
|
10°
|
11°
|
10°
|
8°
|
7°
|
| Freezing Level |
1,800m
|
1,700m
|
1,800m
|
1,900m
|
1,700m
|
1,200m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
0°
|
0°
|
3°
|
3°
|
2°
|
2°
|
| 300m |
5°
|
6°
|
8°
|
7°
|
6°
|
5°
|
| Valley |
7°
|
8°
|
9°
|
9°
|
7°
|
6°
|
Additional weather information
Meteorologist's view
Uncertainty on timing of any rain and drizzle.
Weather
Patchy light rain and drizzle dying out overnight. Mainly dry and cloudy through the morning, then rain and drizzle developing through the afternoon. Becoming dry again with occasional clear spells developing through the evening.
Chance of cloud-free hill tops
60% falling 30% in the afternoon.
Low cloud and visibility
Extensive low cloud, base 600 to 900m, lowering 300 to 500m in the afternoon, but lifting and breaking again later in the evening. Visibility good or very good, falling moderate to very poor in cloud, rain and drizzle.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 3mm | 4.8mm | 11.6mm |
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
Patchy low cloud with occasional showers possible overnight. Dry with any low cloud soon clearing to leave a bright day with sunny spells. Clear skies in the evening with mist and freezing fog patches possibly forming in the valleys.
Chance of cloud-free hill tops
40% overnight becoming 90% daylight hours.
Maximum wind speed expected
East or Southeast 5 to 10mph.
Temperature
- At 600m Zero to Plus 3 Celsius
- Valley Plus 2 to 8 Celsius
- Freezing level Around the summits, rising above the summit during the day.
Low cloud and visibility
Moderate to very poor in low cloud and rain, but mostly very good.
Mountain weather information
Wed 4 Mar
Sunrise:
Sunset:
Low cloud, mist and freezing fog possible overnight and through the morning, otherwise dry with sunny or clear spells. Moderate south or southeast winds at height. Freezing level could be well down at first, but mainly near or above the summits.
Thu 5 Mar
Sunrise:
Sunset:
Occasional low cloud and bright spells. Rain, heavy at times, later with snow possible over the summits. Fresh to strong south or southwest becoming westerly winds. Freezing level near or above the summits.
Fri 6 Mar
Sunrise:
Sunset:
Mainly dry and bright with sunny or clear spells. Moderate or fresh northwesterly winds at height. Freezing level near or above the 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.