Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Medium for overall weather evolution and timings.
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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.
Mountain weather forecast
Cloudy with hill fog and outbreaks of rain.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
30% | 60% | 80% | 30% | 10% | <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 |
S
16
|
S
14
|
SW
15
|
NW
10
|
NW
12
|
N
9
|
| 300m |
SW
7
|
SW
6
|
SW
9
|
NW
6
|
NW
4
|
NW
4
|
| Valley |
SW
6
|
SW
5
|
SW
8
|
NW
5
|
NW
4
|
NW
4
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 21 | 18 | 19 | 13 | 15 | 15 |
| 300m | 18 | 17 | 17 | 11 | 10 | 10 |
| Valley | 17 | 16 | 17 | 11 | 10 | 10 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
6°
|
6°
|
6°
|
5°
|
3°
|
1°
|
| 300m |
7°
|
8°
|
8°
|
6°
|
5°
|
2°
|
| Valley |
8°
|
8°
|
9°
|
7°
|
6°
|
3°
|
| Freezing Level |
1,300m
|
1,500m
|
1,500m
|
1,400m
|
1,000m
|
700m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
1°
|
2°
|
2°
|
1°
|
-2°
|
-3°
|
| 300m |
5°
|
6°
|
6°
|
5°
|
3°
|
0°
|
| Valley |
6°
|
6°
|
7°
|
6°
|
4°
|
1°
|
Additional weather information
Meteorologist's view
The heavy rain could lead to some small streams and river levels rising, with runoff before reducing during the Wednesday evening.
Weather
Overcast with rain, turning heavier and more persistent at times during the day, before becoming dry in the evening with the cloud lifting and breaking, some clear spells possible.
Chance of cloud-free hill tops
20%, but 70% late in period.
Low cloud and visibility
Extensive low cloud, base 300 to 600m, lifting and breaking near or above the summits through the evening, some clear spells by midnight. Visibility moderate to very poor in rain and cloud, becoming mostly very good in the evening.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 8.8mm | 20.4mm | 20.8mm |
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
Mainly dry with bright or clear spells and a frost at first. However, lowering cloud and outbreaks of rain and snow later in the evening
Chance of cloud-free hill tops
80% falling 30% during the evening.
Maximum wind speed expected
West or Southwest 10 to 15mph increasing South or Southwest 20 to 25mph in the evening.
Temperature
- At 600m Minus 2 to Plus 1 Celsius
- Valley Minus 1 rising to Plus 4 Celsius
- Freezing level Most levels at first rising to around 600m.
Low cloud and visibility
Mostly very good, but becoming moderate to very poor during the evening.
Mountain weather information
Thu 15 Jan
Sunrise:
Sunset:
Rain and sleet clearing overnight. Cloudy or bright start, then heavy rain, turning to snow at height later. Moderate south or southwest winds, strengthening from the north or northeast. Blizzards and severe wind chill possible. Freezing level starting above the summits then lowering 600m.
Fri 16 Jan
Sunrise:
Sunset:
Rain and snow clearing overnight. Mainly dry and bright daylight hours. Fresh or strong west or northwest winds at height gradually easing. Freezing level 600m or less at times.
Sat 17 Jan
Sunrise:
Sunset:
Cloudy or bright with showers, perhaps wintry over the tops. Light winds. Freezing level could be well down at first, but rising towards the summits by 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.