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:
-
Mon 11 MaySunrise:Sunset:
-
Tue 12 MaySunrise:Sunset:
-
Further outlook
This evening forecast
Cloudy initially with lengthy clear spells developing. Winds easing allowing for a cold night with a chance of a frost.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Strong Sunlight
Thunderstorms
Mountain weather forecast
Showers or outbreaks of rain clearing to sunny spells later.
|
Time
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Time |
00:00
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03:00
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06:00
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09:00
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12:00
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15:00
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18:00
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21:00
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|---|---|---|---|---|---|---|---|---|---|
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Weather
(at 800m)
|
Weather symbols | ||||||||
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Chance of
precipitation (at 800m)
|
Chance of precipitation |
10%
|
10%
|
20%
|
50%
|
50%
|
20%
|
10%
|
10%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | NE 7mph knots
NE
7mph |
NW 9mph knots
NW
9mph |
NW 13mph knots
NW
13mph |
NW 15mph knots
NW
15mph |
NW 16mph knots
NW
16mph |
N 12mph knots
N
12mph |
N 10mph knots
N
10mph |
NW 6mph knots
NW
6mph |
|
300m
|
300m | SE 2mph knots
SE
2mph |
W 5mph knots
W
5mph |
W 6mph knots
W
6mph |
NW 9mph knots
NW
9mph |
NW 11mph knots
NW
11mph |
NW 8mph knots
NW
8mph |
N 7mph knots
N
7mph |
W 4mph knots
W
4mph |
|
Valley
|
Valley | S 3mph knots
S
3mph |
W 5mph knots
W
5mph |
W 6mph knots
W
6mph |
NW 8mph knots
NW
8mph |
NW 11mph knots
NW
11mph |
N 8mph knots
N
8mph |
N 7mph knots
N
7mph |
W 5mph knots
W
5mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 11mph | 14mph | 18mph | 20mph | 22mph | 17mph | 15mph | 10mph |
|
300m
|
300m | 6mph | 12mph | 13mph | 17mph | 20mph | 15mph | 14mph | 9mph |
|
Valley
|
Valley | 6mph | 13mph | 13mph | 17mph | 20mph | 16mph | 13mph | 10mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 4 degrees Celsius 4°C | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 4 degrees Celsius 4°C |
|
300m
|
300m | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C | 6 degrees Celsius 6°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 | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 11 degrees Celsius 11°C | 6 degrees Celsius 6°C |
| Freezing Level | Freezing Level |
1000m
|
1100m
|
1200m
|
1300m
|
1300m
|
1200m
|
1100m
|
900m
|
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 0 degrees Celsius 0°C | -1 degrees Celsius -1°C | -1 degrees Celsius -1°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 | 2 degrees Celsius 2°C | 1 degrees Celsius 1°C | 4 degrees Celsius 4°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 | 3 degrees Celsius 3°C | 2 degrees Celsius 2°C | 5 degrees Celsius 5°C | 7 degrees Celsius 7°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 |
1000m
|
1100m
|
1200m
|
1300m
|
1300m
|
1200m
|
1100m
|
900m
|
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 cold start with a frost. Showers or longer spells of rain arriving from mid-morning from the north. These clearing most places from mid-afternoon then another cold night.
Chance of cloud-free hill tops
80% reducing to 50% for a time early afternoon.
Low cloud and visibility
Cloud bases mostly above summits but lowering in any heavy showers to shroud summits. Very good visibility dropping to moderate 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 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
70%
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 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
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.