Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence in the generally settled weather, but low confidence in the extent and timing of any low cloud, mist and hill fog in the early hours of Friday. Lower confidence into the weekend with the chance of thunderstorms.
This evening forecast
A fine evening with cloud melting away. Turning chilly.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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
Early cloud clearing with plenty of May sunshine and some fair weather cloud.
| 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) |
<05% | <05% | <05% | <05% | <05% | <05% | <05% | <05% |
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 |
E
9
|
E
7
|
NE
9
|
E
10
|
E
10
|
E
9
|
NE
8
|
E
13
|
| 300m |
E
2
|
E
3
|
E
5
|
E
8
|
E
8
|
E
7
|
N
7
|
SE
7
|
| Valley |
NE
2
|
E
3
|
E
4
|
E
6
|
E
7
|
E
5
|
N
6
|
SE
5
|
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 | 14 | 9 | 12 | 14 | 15 | 14 | 12 | 21 |
| 300m | 5 | 7 | 10 | 12 | 14 | 12 | 13 | 16 |
| Valley | 5 | 9 | 9 | 11 | 13 | 11 | 12 | 12 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
6°
|
4°
|
4°
|
7°
|
11°
|
14°
|
13°
|
10°
|
| 300m |
6°
|
5°
|
5°
|
10°
|
15°
|
17°
|
15°
|
10°
|
| Valley |
6°
|
6°
|
6°
|
11°
|
16°
|
18°
|
16°
|
11°
|
| Freezing Level |
1,500m
|
1,300m
|
1,300m
|
1,400m
|
1,500m
|
1,700m
|
1,700m
|
1,500m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
4°
|
2°
|
0°
|
4°
|
9°
|
12°
|
11°
|
8°
|
| 300m |
5°
|
4°
|
3°
|
9°
|
13°
|
15°
|
14°
|
9°
|
| Valley |
5°
|
4°
|
5°
|
10°
|
14°
|
16°
|
15°
|
10°
|
Additional weather information
Meteorologist's view
Generally very good conditions for walking, though the strong sunshine and warm temperatures mean that appropriate sun protection should be used.
Weather
In the early hours some low cloud may develop, leading to some local mist and fog. This will quickly clear away after dawn to leave another dry day with long spells of sunshine and light winds. Remaining dry into the night with clear skies.
Chance of cloud-free hill tops
40% in the east, quickly rising to 90%
Low cloud and visibility
In the early hours some low cloud may develop to the east of the park, with bases possibly getting down to 300m - 400m around dawn. Visibility will be poor to very poor in this low cloud. However, this will quickly clear in the morning, to leave very little cloud near the summits, and generally very good to excellent visibility.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0mm | 0mm |
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
A chilly start with a frost in places, thereafter dry with lengthy sunshine to start. Fair weather cloud bubbling up through the afternoon to leave sunnier spells. Feeling warm with high UV levels.
Chance of cloud-free hill tops
95%
Maximum wind speed expected
Easterly to southeasterly 10-15 mph gusting 20-25 mph
Temperature
- At 600m Plus 9 Celsius rising to plus 16 Celsius.
- Valley Plus 5 Celsius rising to plus 21 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Limited cloud with any fair weather cloud well above summits.
Mountain weather information
Sun 11 May
Sunrise:
Sunset:
Starting out dry with plenty of sunshine at first. Cloud building through the morning to give a risk of isolated showers. These may be locally heavy with a risk of lightning. Light to moderate winds expected with freezing level well above summits.
Mon 12 May
Sunrise:
Sunset:
Generally cloudy with scattered showers, which may turn heavy and thundery at times. Warm with winds staying light with freezing level well above summits.
Tue 13 May
Sunrise:
Sunset:
Largely dry with sunny intervals but the risk of the odd shower. Winds light to moderate with freezing level above 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.