Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for unsettled, rather mild often windy conditions through the coming week, but lower for timings of arrival and clearance of more persistent rain.
This evening forecast
Clear spells and a few showers. Occasionally strong westerly or southwesterly winds easing.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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.
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
Sunny spells with showers dying out. Heavy evening rain. Occasionally strong winds.
| 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) |
10% | 20% | 50% | 10% | 10% | 10% | 20% | 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 |
SW
25
|
SW
31
|
SW
26
|
SW
22
|
SW
24
|
SW
20
|
S
19
|
S
20
|
| 300m |
SW
13
|
SW
16
|
SW
15
|
SW
12
|
SW
14
|
SW
12
|
S
10
|
S
12
|
| Valley |
SW
9
|
SW
12
|
SW
12
|
SW
10
|
SW
12
|
SW
10
|
S
8
|
S
9
|
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 | 34 | 41 | 36 | 30 | 32 | 28 | 25 | 28 |
| 300m | 28 | 34 | 32 | 27 | 28 | 26 | 22 | 24 |
| Valley | 24 | 30 | 30 | 25 | 27 | 24 | 21 | 23 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
7°
|
7°
|
7°
|
7°
|
8°
|
8°
|
8°
|
8°
|
| 300m |
9°
|
9°
|
9°
|
9°
|
10°
|
9°
|
10°
|
10°
|
| Valley |
9°
|
10°
|
10°
|
10°
|
11°
|
10°
|
10°
|
10°
|
| Freezing Level |
1,600m
|
1,500m
|
1,500m
|
1,400m
|
1,500m
|
1,600m
|
1,900m
|
2,200m
|
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°
|
2°
|
3°
|
3°
|
4°
|
4°
|
| 300m |
6°
|
6°
|
6°
|
6°
|
7°
|
7°
|
8°
|
7°
|
| Valley |
7°
|
7°
|
7°
|
7°
|
8°
|
8°
|
8°
|
8°
|
Additional weather information
Meteorologist's view
Feeling rather cold at height. Gusts around 50mph over ridges and summits through the early hours.
Weather
Clear spells and showers, the showers becoming more frequent and heavier towards the end of the night, perhaps merging to give a longer spells of rain. The showers, or any longer spells of rain, clear soon after dawn and cloud breaks to leave sunny spells and a few showers. Cloud increases again through the late afternoon and early evening, with persistent heavy rain spreading northeast from mid-evening.
Chance of cloud-free hill tops
Around 40% at first soon becoming 75%, chance fall considerably in the evening.
Low cloud and visibility
Occasional or, at first and again later, periods of cloud above 600-750m, with patches below. Away from cloud, visibility very good or excellent, but several kilometres in rain and showers.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 12.6mm | 66.8mm | 74.6mm |
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
Cloudy with heavy rain, the rain becoming lighter and patchier towards dawn. The rain clears through the first half of the morning to leave sunny spells and a few showers, with conditions underfoot likely to be very wet, with swollen water courses.
Chance of cloud-free hill tops
Close to zero at first gradually becoming 75% through the late morning and early afternoon.
Maximum wind speed expected
Southerly or southeasterly 20-25mph, gusts around 40mph over ridges and summits, veering southwesterly 30-40mph soon after dawn, with gusts around 60mph over ridges and summits.
Temperature
- At 600m Around plus 8 or 9 Celsius, rising to plus 11 or 12 Celsius for a time in the morning
- Valley Around plus 8 or 9 Celsius rising to 14 or 15 Celsius by early afternoon
- Freezing level Above the summits.
Low cloud and visibility
Periods or persistent cloud 450-600m, with patches below, at first gradually becoming more occasional above 600-750m through the late morning and early afternoon. Away from cloud, visibility very good or excellent, falling to several kilometres in rain and showers.
Mountain weather information
Wed 10 Dec
Sunrise:
Sunset:
Some sunny spells but generally rather a lot of cloud with occasional showers. Occasionally strong southwesterly winds. Freezing level above the summits.
Thu 11 Dec
Sunrise:
Sunset:
Bright morning but cloud and outbreaks of occasionally heavy rain spreading east through the morning. Occasionally strong southwesterly winds turning more southerly and easing. Freezing levels above summits
Fri 12 Dec
Sunrise:
Sunset:
Cloudy with outbreaks of occasionally heavy rain. Fresh southerly winds. Freezing level above summits.
Updated at:
Summit specific forecast
Mountain summit forecast map
Loading map…
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.