Mountain weather
Bannau Brycheiniog / Brecon Beacons
Confidence
High confidence overall, however lower confidence in the location and detail of showers, particularly later in the period.
-
This eveningSunrise:Sunset:
-
Tue 12 MaySunrise:Sunset:
-
Wed 13 MaySunrise:Sunset:
-
Further outlook
This evening forecast
Dry with clearing skies, feeling cold with a frost in places.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Strong Sunlight
Severe Chill Effect
Thunderstorms
Mountain weather forecast
Turning cloudy, perhaps with some light rain for a time.
|
Time
|
Time |
00:00
|
03:00
|
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 |
10%
|
10%
|
20%
|
30%
|
40%
|
20%
|
20%
|
20%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | NW 4mph knots
NW
4mph |
W 6mph knots
W
6mph |
W 10mph knots
W
10mph |
W 15mph knots
W
15mph |
NW 18mph knots
NW
18mph |
NW 20mph knots
NW
20mph |
NW 17mph knots
NW
17mph |
W 15mph knots
W
15mph |
|
300m
|
300m | W 3mph knots
W
3mph |
SW 4mph knots
SW
4mph |
W 6mph knots
W
6mph |
W 10mph knots
W
10mph |
NW 13mph knots
NW
13mph |
NW 14mph knots
NW
14mph |
NW 10mph knots
NW
10mph |
SW 8mph knots
SW
8mph |
|
Valley
|
Valley | W 4mph knots
W
4mph |
W 4mph knots
W
4mph |
W 5mph knots
W
5mph |
W 9mph knots
W
9mph |
NW 12mph knots
NW
12mph |
NW 12mph knots
NW
12mph |
NW 9mph knots
NW
9mph |
W 7mph knots
W
7mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 6mph | 9mph | 15mph | 20mph | 24mph | 28mph | 23mph | 22mph |
|
300m
|
300m | 4mph | 7mph | 13mph | 19mph | 23mph | 25mph | 19mph | 18mph |
|
Valley
|
Valley | 6mph | 7mph | 12mph | 18mph | 23mph | 24mph | 19mph | 17mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 6 degrees Celsius 6°C |
|
300m
|
300m | 3 degrees Celsius 3°C | 2 degrees Celsius 2°C | 6 degrees Celsius 6°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C |
|
Valley
|
Valley | 4 degrees Celsius 4°C | 3 degrees Celsius 3°C | 6 degrees Celsius 6°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 9 degrees Celsius 9°C |
| Freezing Level | Freezing Level |
900m
|
800m
|
1200m
|
1300m
|
1400m
|
1200m
|
1200m
|
1300m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 1 degrees Celsius 1°C | 1 degrees Celsius 1°C | 0 degrees Celsius 0°C | 2 degrees Celsius 2°C | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 3 degrees Celsius 3°C |
|
300m
|
300m | 2 degrees Celsius 2°C | 1 degrees Celsius 1°C | 4 degrees Celsius 4°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 6 degrees Celsius 6°C |
|
Valley
|
Valley | 2 degrees Celsius 2°C | 1 degrees Celsius 1°C | 4 degrees Celsius 4°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 7 degrees Celsius 7°C |
| Freezing Level | Freezing Level |
900m
|
800m
|
1200m
|
1300m
|
1400m
|
1200m
|
1200m
|
1300m
|
Additional weather information
Meteorologist's view
Surprising chilly for the time of year, however UV levels will remain moderate to high throughout, so sun protection is advised. Conditions will deteriorate for a time from late morning making navigation more challenging.
Weather
A cloudy but bright start on Tuesday, a few sunny spells will give way to increasing amounts of cloud, with some patchy light rain and drizzle possible from late morning. Turning brighter into the afternoon but feeling cold for the time of year.
Chance of cloud-free hill tops
80% reducing to 60% for a time from late morning.
Low cloud and visibility
Cloud bases mostly above the level of summits throughout, however temporary deteriorations are possible from late morning until early afternoon with cloud bases dropping low enough to shield summits for a time. Visibility generally high, however reducing to moderate in any rain or drizzle.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Mostly clear during the early hours, however it will turn increasingly cloudy during the morning with frequent showers spreading across the park from mid-morning. These locally heavy and carrying a risk of hail and thunder. Becoming increasingly blustery and feeling cold.
Chance of cloud-free hill tops
70% throughout.
Maximum wind speed expected
Northwesterly means of 15-20 mph, gusting to 30-35 mph
Temperature
- At 600m Plus 1 Celsius rising to plus 8 Celsius.
- Valley Plus 3 Celsius rising to plus 13 Celsius.
- Freezing level Above level of summits.
Low cloud and visibility
Cloud bases mostly above the level of summits throughout, however levels likely to drop with temporary deteriorations as cloud bases drop low enough to shield summits for a time. Visibility generally high, however reducing to moderate in any rain or drizzle.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Thu 14 May
Changeable with a mixture of sunny spells and blustery showers, these locally heavy and perhaps thundery. Feeling cold for mid-May. Still rather breezy but with lighter winds than Wednesday.
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 dry and bright start likely, but clouding over from the west with rain and drizzle during the afternoon. Feeling less cold than recent days as temperatures start to recover.
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.