Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for generally fine conditions for Wednesday, and then for heavy, possibly thundery showers overnight into Thursday and Friday, although lower confidence in the details and timings of showers, as well as cloud details on Thursday.
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
Fine and settled with sunshine. Showers later in the evening.
| Time | 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% | 20% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
SE
13
|
S
18
|
SE
18
|
SE
17
|
SE
18
|
SE
22
|
| 300m |
E
3
|
SE
8
|
SE
10
|
SE
10
|
SE
8
|
E
8
|
| Valley |
E
2
|
SE
6
|
SE
9
|
SE
9
|
SE
8
|
E
7
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 18 | 23 | 23 | 23 | 25 | 33 |
| 300m | 6 | 15 | 18 | 18 | 16 | 19 |
| Valley | 6 | 13 | 17 | 18 | 17 | 18 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
11°
|
14°
|
16°
|
17°
|
17°
|
15°
|
| 300m |
11°
|
17°
|
20°
|
21°
|
20°
|
16°
|
| Valley |
11°
|
18°
|
21°
|
22°
|
20°
|
16°
|
| Freezing Level |
3,100m
|
3,100m
|
2,800m
|
3,300m
|
3,300m
|
3,400m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
9°
|
10°
|
13°
|
14°
|
14°
|
11°
|
| 300m |
10°
|
16°
|
19°
|
19°
|
19°
|
15°
|
| Valley |
10°
|
17°
|
20°
|
20°
|
20°
|
16°
|
Additional weather information
Meteorologist's view
A fine day in the mountains with high UV levels and turning warm and humid. Sun protection advised.
Weather
Fine and dry for much of Wednesday. Feeling very warm with lengthy periods of strong sunlight interspersed with wispy cloud. Chance of heavy showers or thunderstorms in the far west during the final few hours of the day.
Chance of cloud-free hill tops
Nearly 100%.
Low cloud and visibility
Largely clear skies to start the day with some shallow mist or fog patches. Any cloud arriving later remaining above the summits. Very good visibility for most of Wednesday, dropping to poor in any heavy showers at the very end.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 5.8mm | 10.8mm | 12.2mm |
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 and muggy start with outbreaks of rain, locally heavy and possibly thundery. Sunnier spells emerging in the afternoon, though a scattering of further showers may also develop. Fresh southerly winds, but feeling warm and humid, especially in any sunnier breaks.
Chance of cloud-free hill tops
40% rising to 80%
Maximum wind speed expected
Southerly 25 mph gusting 35 mph.
Temperature
- At 600m Plus 12 Celsius rising to plus 17 Celsius.
- Valley Plus 17 Celsius rising to plus 22 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Broken low cloud around 400-500 m during the morning, dropping in heavier downpours. Rising above summits through the afternoon.
Mountain weather information
Fri 13 Jun
Sunrise:
Sunset:
Sunny spells by day, perhaps with a few showers. More coherent band of heavy and potentially thundery rain arriving later in the evening. Moderate southerly winds on the hills, but again feeling warm, if not very warm, in the sun.
Sat 14 Jun
Sunrise:
Sunset:
A mixed day with showers and longer periods of rain, potentially heavy, interspersed by brief drier and brighter periods. Feeling fresher and cooler than the proceeding days as winds switch to a southwesterly. Freezing level above the summit throughout.
Sun 15 Jun
Sunrise:
Sunset:
Patchy low cloud first thing, then a good deal of fine and dry weather with sunny spells. 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.