Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Moderate confidence regarding rain clearance time on Sunday morning but high for a mostly dry and sunny afternoon. Lower confidence for details of rain on Monday and cloud details on Tuesday and Wednesday.
This evening forecast
Wet and windy this evening.
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.
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.
Strong Sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.
Mountain weather forecast
Rain and cloud clearing to leave a mild and largely sunny afternoon.
| 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) |
>95% | 90% | 80% | 30% | <05% | 10% | 30% | 60% |
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
27
|
SW
24
|
W
21
|
W
21
|
W
22
|
W
25
|
SW
24
|
W
24
|
| 300m |
SW
15
|
SW
14
|
W
12
|
W
12
|
W
14
|
SW
16
|
SW
13
|
SW
15
|
| Valley |
SW
13
|
SW
12
|
W
10
|
W
10
|
W
13
|
W
15
|
SW
12
|
W
13
|
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 | 36 | 33 | 29 | 28 | 29 | 33 | 32 | 34 |
| 300m | 34 | 30 | 25 | 25 | 26 | 30 | 28 | 31 |
| Valley | 32 | 28 | 24 | 23 | 26 | 30 | 27 | 29 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
8°
|
8°
|
7°
|
6°
|
7°
|
7°
|
6°
|
6°
|
| 300m |
10°
|
10°
|
9°
|
9°
|
10°
|
10°
|
8°
|
8°
|
| Valley |
10°
|
10°
|
10°
|
9°
|
11°
|
11°
|
9°
|
9°
|
| Freezing Level |
2,300m
|
2,200m
|
1,800m
|
1,300m
|
1,300m
|
1,300m
|
1,300m
|
1,300m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
3°
|
3°
|
3°
|
1°
|
2°
|
2°
|
0°
|
0°
|
| 300m |
7°
|
6°
|
6°
|
6°
|
7°
|
7°
|
5°
|
4°
|
| Valley |
8°
|
8°
|
7°
|
7°
|
8°
|
8°
|
6°
|
6°
|
Additional weather information
Meteorologist's view
A little uncertainty regarding the clearance time of the rain in the morning but a fine, albeit blustery, afternoon is expected.
Weather
A wet and windy night with some heavy rain around dawn but this clearing quickly through the morning. Brighter skies developing with sunny periods and just the small chance of a passing shower by the evening. Blustery with some strong gusts at times.
Chance of cloud-free hill tops
Less than 20% through the overnight hours, becoming 90% through the morning.
Low cloud and visibility
Widespread cloud above 200-400m during the early hours but clearing to periods above 500-600m through the morning with only occasional patches above 700m through the afternoon. Often very good visibility at lower levels with excellent air clarity but poor in rain first thing and very poor in cloud.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 9.2mm | 17.4mm | 24.4mm |
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
Occasional showers through the early hours, these merging into more general rain through the morning. Very wet and windy through the afternoon with persistent and heavy rain developing. Perhaps turning drier after dark.
Chance of cloud-free hill tops
40% through the morning (70% in the northeast) becoming less than 10% by mid-afternoon.
Maximum wind speed expected
Westerly or southwesterly 40-50 mph.
Temperature
- At 600m Plus 6 Celsius, becoming plus 8 Celsius.
- Valley Plus 8 Celsius rising to plus 12 Celsius.
- Freezing level Well above the summits.
Low cloud and visibility
Periods of cloud above 400-500m during the morning, becoming extensive fog above 300-400m through the afternoon. Good visibility for many first thing but becoming widely poor through the afternoon and very poor in cloud/fog and remaining similar for the rest of daylight hours.
Mountain weather information
Tue 24 Feb
Sunrise:
Sunset:
A much drier day is expected. Probably largely cloudy with the odd spot of drizzle. Fresh to strong southerly winds. Mild with freezing levels well above the summits.
Wed 25 Feb
Sunrise:
Sunset:
Often cloudy but a better chance of some breaks and sunny intervals. Moderate to fresh southerly winds. Mild with freezing levels well above the summits.
Thu 26 Feb
Sunrise:
Sunset:
Fresh to strong southerly or southwesterly winds. Rain or drizzle at times, this possibly turning persistent and heavy later. Mild with freezing levels well above the 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.