Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for the dry and settled theme to continue into the Bank Holiday weekend. Moderate for cloud and sunshine amounts.
This evening forecast
Dry this evening with clear spells into the night.
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
A chilly start, with sunnier intervals through the 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) |
00% | 00% | 00% | 00% | 00% | 00% | 00% | 00% |
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 |
NE
9
|
NE
11
|
NE
11
|
NE
12
|
NE
11
|
NE
8
|
N
8
|
NE
8
|
| 300m |
NE
3
|
NE
3
|
NE
4
|
NE
7
|
NE
7
|
NE
6
|
N
5
|
NE
3
|
| Valley |
E
2
|
NE
2
|
NE
2
|
NE
6
|
NE
6
|
NE
5
|
N
5
|
NE
2
|
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 | 14 | 15 | 17 | 15 | 12 | 12 | 12 |
| 300m | 10 | 9 | 10 | 12 | 13 | 10 | 11 | 7 |
| Valley | 9 | 8 | 8 | 11 | 12 | 10 | 10 | 7 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
10°
|
8°
|
7°
|
10°
|
13°
|
15°
|
15°
|
12°
|
| 300m |
10°
|
8°
|
8°
|
13°
|
17°
|
19°
|
18°
|
11°
|
| Valley |
10°
|
8°
|
8°
|
14°
|
18°
|
19°
|
18°
|
12°
|
| Freezing Level |
2,200m
|
2,000m
|
2,000m
|
1,900m
|
2,200m
|
2,400m
|
2,400m
|
2,400m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
8°
|
6°
|
4°
|
7°
|
11°
|
14°
|
14°
|
10°
|
| 300m |
9°
|
7°
|
7°
|
12°
|
15°
|
17°
|
16°
|
11°
|
| Valley |
10°
|
7°
|
8°
|
13°
|
16°
|
18°
|
17°
|
11°
|
Additional weather information
Meteorologist's view
Whilst it won't feel particularly hot, sun protection is strongly advised with high or very high UV levels expected during the midday hours.
Weather
A chilly start in the valleys with some mist or shallow fog possible. This quickly clearing after dawn in the strong August sunshine. Staying fine throughout the day with prolonged periods of sunshine. A little high cloud is possible later. Lighter winds and feeling warmer.
Chance of cloud-free hill tops
Greater than 90%
Low cloud and visibility
Any cloud is expected to be above the summits. Locally very poor visibility in valley fog and/or cloud, but otherwise very good visibility with excellent air clarity, allowing for far-reaching views of distant hills and landmarks.
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 similar day to Thursday with any mist of fog quickly clearing in the morning with the best of the sunshine early on. Cloud building through the afternoon with occasional brighter spells, but remaining dry with lighter winds.
Chance of cloud-free hill tops
90%
Maximum wind speed expected
Northwesterly 10-20 mph.
Temperature
- At 600m Plus 8 Celsius rising t plus 16 Celsius.
- Valley Plus 10 Celsius rising to plus 21 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Some early mist and fog patches otherwise cloud bases above summits. Otherwise, very good visibility.
Mountain weather information
Sat 23 Aug
Sunrise:
Sunset:
Largely fine with a mixture of cloudy periods and occasional bright or sunny spells with the low risk of a shower. Light westerly winds.
Sun 24 Aug
Sunrise:
Sunset:
Staying mainly dry albeit perhaps somewhat cloudier than preceding days. Occasional sunny intervals and a warmer feel with light southerly winds.
Mon 25 Aug
Sunrise:
Sunset:
Lower confidence for Monday, but largely fine and dry with sunny spells. Feeling pleasant in any sunny spells.
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.