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.
-
Mon 11 MaySunrise:Sunset:
-
Tue 12 MaySunrise:Sunset:
-
Further outlook
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Strong Sunlight
Severe Chill Effect
Poor Visibility
Mountain weather forecast
Showers or outbreaks of rain clearing to sunny spells later.
|
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 |
20%
|
50%
|
50%
|
10%
|
10%
|
10%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | NW 12mph knots
NW
12mph |
NW 16mph knots
NW
16mph |
N 14mph knots
N
14mph |
N 10mph knots
N
10mph |
N 9mph knots
N
9mph |
NW 6mph knots
NW
6mph |
|
300m
|
300m | W 6mph knots
W
6mph |
NW 9mph knots
NW
9mph |
N 8mph knots
N
8mph |
N 6mph knots
N
6mph |
N 7mph knots
N
7mph |
W 5mph knots
W
5mph |
|
Valley
|
Valley | W 6mph knots
W
6mph |
NW 8mph knots
NW
8mph |
N 8mph knots
N
8mph |
N 6mph knots
N
6mph |
N 6mph knots
N
6mph |
W 5mph knots
W
5mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | 16mph | 21mph | 18mph | 14mph | 12mph | 9mph |
|
300m
|
300m | 13mph | 18mph | 14mph | 12mph | 13mph | 10mph |
|
Valley
|
Valley | 14mph | 17mph | 17mph | 13mph | 12mph | 10mph |
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | 4 degrees Celsius 4°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 4 degrees Celsius 4°C |
|
300m
|
300m | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 10 degrees Celsius 10°C | 5 degrees Celsius 5°C |
|
Valley
|
Valley | 8 degrees Celsius 8°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 6 degrees Celsius 6°C |
| Freezing Level | Freezing Level |
1300m
|
1400m
|
1300m
|
1200m
|
1100m
|
1000m
|
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | 0 degrees Celsius 0°C | 2 degrees Celsius 2°C | 4 degrees Celsius 4°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C | 2 degrees Celsius 2°C |
|
300m
|
300m | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 3 degrees Celsius 3°C |
|
Valley
|
Valley | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 4 degrees Celsius 4°C |
| Freezing Level | Freezing Level |
1300m
|
1400m
|
1300m
|
1200m
|
1100m
|
1000m
|
Additional weather information
Meteorologist's view
Surprisingly chilly for the time of year, especially early and late, however UV levels will remain moderate to high throughout, so sun protection is advised. Conditions will deteriorate for a time during the morning making navigation more challenging.
Weather
A cold but bright start with a frost in places. Showers or longer spells of rain then arriving through the morning from the north. These clearing by mid-afternoon, with sunny spells then developing ahead of another cold night.
Chance of cloud-free hill tops
90% reducing to 50% for a time during the morning.
Low cloud and visibility
Cloud bases mostly above summits but lowering in any heavier bursts of rain or showers to shroud summits. Very good visibility dropping to moderate or poor in any rain.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
A cloudy but bright start on Tuesday, a few sunny spells giving way to increasing amounts of cloud, with some patchy light rain and drizzle possible from late morning. Turning bright and sunny again into the afternoon but feeling cold for the time of year.
Chance of cloud-free hill tops
90%.
Maximum wind speed expected
Northwesterly gusting between 20 and 25 mph.
Temperature
- At 600m Plus 1 Celsius rising to plus 9 Celsius.
- Valley Plus 4 Celsius rising to plus 14 Celsius.
- Freezing level Above level of summits.
Low cloud and visibility
Cloud bases mostly above the level of summit throughout, however temporary deteriorations are possible from late morning until early afternoon with cloud bases dropping low enough to briefly shield summits. Visibility generally high, however reducing to moderate or poor in any rain or drizzle.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Wed 13 May
Changeable with a mixture of sunny spells and blustery showers, these locally heavy and perhaps thundery. Widely windy and feeling cold for mid-May.
Thu 14 May
Similar to Wednesday with sunshine and scattered heavy showers, some with hail and thunder. Showers tending to ease later in the day. Moderate northerly winds.
Fri 15 May
A chilly start, but mostly fine and dry, turning cloudier into the afternoon. Light winds, but still widely cool.
Mountain weather information
Wed 13 May
Changeable with a mixture of sunny spells and blustery showers, these locally heavy and perhaps thundery. Widely windy and feeling cold for mid-May.
Thu 14 May
Similar to Wednesday with sunshine and scattered heavy showers, some with hail and thunder. Showers tending to ease later in the day. Moderate northerly winds.
Fri 15 May
A chilly start, but mostly fine and dry, turning cloudier into the afternoon. Light winds, but still widely cool.
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.