Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High overall for bright but showery theme, though lower for location and intensity of heavy and thundery showers and extent of overnight low cloud.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Thunderstorms
Strong Sunlight
Heavy Persistent Rain
Mountain weather forecast
Brightening up, but heavy, thundery showers possible by the afternoon.
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
Weather (at 600m) |
||||||
Chance of precipitation (at 600m) |
10% | 20% | 60% | 60% | 40% | 30% |
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
600m |
NE
8
|
NE
9
|
NE
10
|
NE
9
|
NE
8
|
NE
9
|
300m |
E
1
|
NE
4
|
NE
6
|
NE
5
|
NE
4
|
NE
4
|
Valley |
W
1
|
E
3
|
E
4
|
NE
4
|
N
4
|
NE
4
|
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
600m | 11 | 12 | 15 | 14 | 11 | 13 |
300m | 6 | 8 | 11 | 11 | 10 | 10 |
Valley | 4 | 6 | 9 | 10 | 11 | 10 |
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
600m |
11°
|
12°
|
14°
|
15°
|
14°
|
12°
|
300m |
12°
|
15°
|
17°
|
18°
|
16°
|
13°
|
Valley |
12°
|
16°
|
18°
|
18°
|
17°
|
14°
|
Freezing Level |
2,300m
|
2,300m
|
2,400m
|
2,500m
|
2,600m
|
2,500m
|
06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
---|---|---|---|---|---|---|
600m |
9°
|
11°
|
13°
|
14°
|
13°
|
11°
|
300m |
12°
|
15°
|
16°
|
17°
|
16°
|
13°
|
Valley |
12°
|
16°
|
18°
|
18°
|
17°
|
14°
|
Additional weather information
Meteorologist's view
Sudden deteriorations in heavy, thundery showers leading to surface runoff. Strong sunshine at this time of the year so ensure you have sun protection with high UV levels expected.
Weather
Early low cloud clearing to leave a day of sunny spells and showers. Perhaps fewer sunny intervals than on Friday with a higher risk of heavy showers. These could be slow-moving and locally thundery with hail possible before gradually easing through the evening.
Chance of cloud-free hill tops
60% becoming 90% by mid-morning. Falling to 60% during showers.
Low cloud and visibility
Areas of low cloud above 500m at first, mainly in the east, and some mist or fog also possible in the valleys. Cloud and fog lifting and clearing most summits by mid-morning. Generally good visibility thereafter but deteriorating to poor or very poor in any afternoon heavy showers or thunderstorms.
Recent rainfall
Last 24 hours | Last 48 hours | Last 72 hours |
---|---|---|
0mm | 5mm | 5mm |
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
Dry start with low cloud affecting the east of the park, lifting and breaking to leave plenty of warm sunshine. The chance of an isolated heavy shower during the afternoon but mostly dry.
Chance of cloud-free hill tops
60% in the east at first, otherwise 95%
Maximum wind speed expected
Northeasterly 20 mph.
Temperature
- At 600m Plus 08 Celsius rising to plus 15 Celsius.
- Valley Plus 13 Celsius rising to plus 20 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Areas of low cloud around 400-500 m at first in the east with some mist or fog also possible in the valleys. Cloud and fog lifting and breaking most summits by mid-morning. Generally very good visibility with clear views of distant hills.
Mountain weather information
Mon 20 May
Morning mist and fog quickly clearing, then dry with sunny spells. Light northeasterly winds. High UV levels.
Tue 21 May
Turning more changeable but some uncertainty in the details. Showers developing with a chance of longer spells of rain later. Winds remaining light from variable directions.
Wed 22 May
Largely dry with bright or sunny spells and the chance of showers though detail remains uncertain. Light to moderate northwesterly.
Summit specific forecast
Mountain summit forecast map
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.