Mountain weather
Bannau Brycheiniog / Brecon Beacons
Confidence
High confidence in the overall weather but precise shower detail and timing remains lower confidence.
-
Wed 13 MaySunrise:Sunset:
-
Thu 14 MaySunrise:Sunset:
-
Further outlook
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Heavy Persistent Rain
Strong Sunlight
Severe Chill Effect
Poor Visibility
Thunderstorms
Mountain weather forecast
Heavy, blustery showers and some brighter spells.
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
Weather
(at 800m)
|
Weather symbols | ||||||
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
80%
|
90%
|
90%
|
90%
|
90%
|
90%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | W 22mph knots
W
22mph |
W 23mph knots
W
23mph |
NW 25mph knots
NW
25mph |
NW 24mph knots
NW
24mph |
NW 20mph knots
NW
20mph |
NW 18mph knots
NW
18mph |
|
300m
|
300m | W 13mph knots
W
13mph |
W 15mph knots
W
15mph |
NW 17mph knots
NW
17mph |
NW 16mph knots
NW
16mph |
NW 12mph knots
NW
12mph |
W 9mph knots
W
9mph |
|
Valley
|
Valley | W 11mph knots
W
11mph |
W 15mph knots
W
15mph |
NW 15mph knots
NW
15mph |
NW 14mph knots
NW
14mph |
NW 11mph knots
NW
11mph |
W 8mph knots
W
8mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | 28mph | 31mph | 33mph | 32mph | 27mph | 25mph |
|
300m
|
300m | 27mph | 30mph | 32mph | 31mph | 24mph | 19mph |
|
Valley
|
Valley | 26mph | 30mph | 32mph | 30mph | 24mph | 19mph |
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 6 degrees Celsius 6°C | 4 degrees Celsius 4°C |
|
300m
|
300m | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 6 degrees Celsius 6°C |
|
Valley
|
Valley | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 7 degrees Celsius 7°C |
| Freezing Level | Freezing Level |
1000m
|
1000m
|
1100m
|
1100m
|
1100m
|
1100m
|
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | -2 degrees Celsius -2°C | -1 degrees Celsius -1°C | 0 degrees Celsius 0°C | 1 degrees Celsius 1°C | 1 degrees Celsius 1°C | -1 degrees Celsius -1°C |
|
300m
|
300m | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C | 3 degrees Celsius 3°C |
|
Valley
|
Valley | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C | 4 degrees Celsius 4°C |
| Freezing Level | Freezing Level |
1000m
|
1000m
|
1100m
|
1100m
|
1100m
|
1100m
|
Additional weather information
Meteorologist's view
Frequent and locally heavy showers will bring a very changeable day. Care needed if heading into the hills with temperatures feeling cold at height, some gusty winds and a risk of thunder. UV levels also remaining high in any brighter spells.
Weather
Blustery showers on Wednesday with some heavy downpours. Showers could fall as hail at times with a small risk of thunder. Some clear or sunny spells likely, but skies often quickly cloud. There is also a small risk of thunderstorms, particularly during the afternoon.
Chance of cloud-free hill tops
70% becoming 90% into the morning.
Low cloud and visibility
There may be a little cloud with bases 500-600m to start, quickly rising above all summits into the morning. Visibility will generally be very good, although falling rapidly within any heavy showers to become moderate to poor.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Scattered showers continuing on Thursday with heavy downpours at times, and perhaps hail. A small chance of thunderstorms during the afternoon and a few brighter spells. Feeling cold with brisk winds continuing.
Chance of cloud-free hill tops
80%.
Maximum wind speed expected
North-westerly 15-20mph gusting 25-30mph.
Temperature
- At 600m Plus 2 rising to plus 8
- Valley Plus 1 rising to plus 12
- Freezing level Above summits.
Low cloud and visibility
Cloud bases around 600-800m at times, enough to shield summits. Visibility will generally be very good, although falling rapidly within any heavy showers to become moderate to poor.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Fri 15 May
A chilly start, but mostly fine and dry, turning cloudier into the afternoon. Light winds, but still widely cool.
Sat 16 May
A largely dry day with sunny spells. Cloud perhaps thickening at times, and light winds.
Sun 17 May
Skies clouding over from the west on Sunday with showery outbreaks of rain. Rain likely clearing to the east later but remaining largely cloudy.
Mountain weather information
Fri 15 May
A chilly start, but mostly fine and dry, turning cloudier into the afternoon. Light winds, but still widely cool.
Sat 16 May
A largely dry day with sunny spells. Cloud perhaps thickening at times, and light winds.
Sun 17 May
Skies clouding over from the west on Sunday with showery outbreaks of rain. Rain likely clearing to the east later but remaining largely cloudy.
Summit specific forecast
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.