Mountain weather
Bannau Brycheiniog / Brecon Beacons
Confidence
High for the overall theme. Lower confidence for any heavy downpours on Friday.
-
Fri 8 MaySunrise:Sunset:
-
Sat 9 MaySunrise:Sunset:
-
Further outlook
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Thunderstorms
Strong Sunlight
Mountain weather forecast
Often cloudy with showers by the afternoon.
|
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 |
30%
|
20%
|
20%
|
60%
|
60%
|
30%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | SE 7mph knots
SE
7mph |
SE 11mph knots
SE
11mph |
SE 9mph knots
SE
9mph |
S 9mph knots
S
9mph |
S 4mph knots
S
4mph |
E 8mph knots
E
8mph |
|
300m
|
300m | E 2mph knots
E
2mph |
E 5mph knots
E
5mph |
SE 6mph knots
SE
6mph |
SE 4mph knots
SE
4mph |
SE 5mph knots
SE
5mph |
E 4mph knots
E
4mph |
|
Valley
|
Valley | E 2mph knots
E
2mph |
E 6mph knots
E
6mph |
SE 7mph knots
SE
7mph |
SE 4mph knots
SE
4mph |
SE 5mph knots
SE
5mph |
E 3mph knots
E
3mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | 9mph | 14mph | 13mph | 12mph | 8mph | 10mph |
|
300m
|
300m | 6mph | 10mph | 12mph | 8mph | 8mph | 9mph |
|
Valley
|
Valley | 7mph | 11mph | 14mph | 8mph | 8mph | 9mph |
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 9 degrees Celsius 9°C |
|
300m
|
300m | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 9 degrees Celsius 9°C |
|
Valley
|
Valley | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 13 degrees Celsius 13°C | 15 degrees Celsius 15°C | 13 degrees Celsius 13°C | 10 degrees Celsius 10°C |
| Freezing Level | Freezing Level |
1400m
|
1700m
|
1600m
|
1800m
|
1900m
|
1800m
|
|
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 | 7 degrees Celsius 7°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 7 degrees Celsius 7°C |
|
300m
|
300m | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 11 degrees Celsius 11°C | 14 degrees Celsius 14°C | 11 degrees Celsius 11°C | 8 degrees Celsius 8°C |
|
Valley
|
Valley | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C |
| Freezing Level | Freezing Level |
1400m
|
1700m
|
1600m
|
1800m
|
1900m
|
1800m
|
Additional weather information
Meteorologist's view
Poor conditions to start with good navigational skills required. UV still strong despite cloud cover so sun protection advised as well as a waterproof if caught in a heavy downpour.
Weather
Cloudy through the early hours with outbreaks of rain. Drier thereafter with warm sunny spells developing in the afternoon, but always with the risk of a shower, heaviest to the east of the park though mostly dry. These fading by the evening with clearer skies into the night.
Chance of cloud-free hill tops
60% rising to 90% by midday.
Low cloud and visibility
Patchy cloud around 400-500 m initially, then gradually lifting above summits by midday. Poor visibility first thing in rain then very good by the afternoon. Dropping in any sharp showers.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Early mist and shallow fog clearing then a bright day with hazy sunshine or sunny spells. Mostly dry but the risk of a shower possible in the north of the National Park during the afternoon. Cloudier with outbreaks of rain by the evening. Another warm day.
Chance of cloud-free hill tops
90% lowering to 60% by the end of the day.
Maximum wind speed expected
Northeasterly 15-20mph.
Temperature
- At 600m Plus 6 Celsius rising to plus 13 Celsius.
- Valley Plus 9 Celsius rising to plus 18 Celsius.
- Freezing level Above freezing.
Low cloud and visibility
Shallow fog first thing otherwise any cloud above summits before lowering by late evening down to 500m or lower. Very good visibility but dropping to very poor in low cloud later.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Sun 10 May
Murky with hill fog to start. Cloud lifting and breaking to leave a dry afternoon with sunny spells. Feeling cooler with brisk northeasterly winds.
Mon 11 May
A cold start with showers or longer spells of rain arriving by the afternoon from the north. Chilly with moderate northerly winds.
Tue 12 May
Dry with sunny intervals and light to moderate northwesterly winds.
Mountain weather information
Sun 10 May
Murky with hill fog to start. Cloud lifting and breaking to leave a dry afternoon with sunny spells. Feeling cooler with brisk northeasterly winds.
Mon 11 May
A cold start with showers or longer spells of rain arriving by the afternoon from the north. Chilly with moderate northerly winds.
Tue 12 May
Dry with sunny intervals and light to moderate northwesterly winds.
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.