Mountain weather
Bannau Brycheiniog / Brecon Beacons
Confidence
Generally high confidence, although moderate for the extent of showers through Monday daytime.
-
This eveningSunrise:Sunset:
-
Mon 18 MaySunrise:Sunset:
-
Tue 19 MaySunrise:Sunset:
-
Further outlook
This evening forecast
Scattered showers continuing this evening with some heavy downpours at times and a small risk of a thunderstorm. Drier, clearer spells in between.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Heavy Persistent Rain
Thunderstorms
Strong Sunlight
Mountain weather forecast
Rain moving through overnight, followed by heavy scattered showers.
|
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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|---|---|---|---|---|---|---|---|---|---|
|
Weather
(at 800m)
|
Weather symbols | ||||||||
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
80%
|
80%
|
80%
|
60%
|
60%
|
60%
|
80%
|
80%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | SW 15mph knots
SW
15mph |
SW 17mph knots
SW
17mph |
SW 13mph knots
SW
13mph |
SW 11mph knots
SW
11mph |
SW 14mph knots
SW
14mph |
SW 16mph knots
SW
16mph |
S 15mph knots
S
15mph |
S 20mph knots
S
20mph |
|
300m
|
300m | SW 7mph knots
SW
7mph |
SW 9mph knots
SW
9mph |
SW 8mph knots
SW
8mph |
SW 7mph knots
SW
7mph |
SW 9mph knots
SW
9mph |
SW 11mph knots
SW
11mph |
S 8mph knots
S
8mph |
S 9mph knots
S
9mph |
|
Valley
|
Valley | SW 6mph knots
SW
6mph |
SW 7mph knots
SW
7mph |
SW 6mph knots
SW
6mph |
W 5mph knots
W
5mph |
SW 8mph knots
SW
8mph |
SW 9mph knots
SW
9mph |
S 6mph knots
S
6mph |
SE 7mph knots
SE
7mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 20mph | 23mph | 17mph | 15mph | 19mph | 22mph | 20mph | 28mph |
|
300m
|
300m | 18mph | 19mph | 16mph | 13mph | 17mph | 21mph | 16mph | 20mph |
|
Valley
|
Valley | 16mph | 18mph | 15mph | 11mph | 16mph | 19mph | 13mph | 18mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C |
|
300m
|
300m | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C |
|
Valley
|
Valley | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C | 8 degrees Celsius 8°C | 10 degrees Celsius 10°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C |
| Freezing Level | Freezing Level |
1200m
|
1300m
|
1300m
|
1300m
|
1400m
|
1600m
|
1700m
|
1900m
|
|
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 | 0 degrees Celsius 0°C | 1 degrees Celsius 1°C | 2 degrees Celsius 2°C | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C |
|
300m
|
300m | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C | 5 degrees Celsius 5°C | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C |
|
Valley
|
Valley | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C |
| Freezing Level | Freezing Level |
1200m
|
1300m
|
1300m
|
1300m
|
1400m
|
1600m
|
1700m
|
1900m
|
Additional weather information
Meteorologist's view
Appropriate footwear for damp ground necessary due to recent rain, waterproofs necessary during spells of heavy rain. UV levels moderate during the day between showers, sun protection advised.
Weather
A band of heavy, organised showers clearing eastwards during the early hours. Drier thereafter with a few showers into the afternoon and a small risk of a thunderstorm. More persistent rain edging in by the evening and moving across the park into the night, heavy in the west. Winds increasing.
Chance of cloud-free hill tops
60% dropping to 40% by end of day.
Low cloud and visibility
Broken cloud around 400-500 m at first, lifting mostly above summits, then lowering further by the evening down to 400m and becoming more widespread across the park. Good visibility outside showers, dropping to very poor by the evening in more persistent rain.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Rain clearing in the early hours followed by scattered heavy and blustery showers. Rather windy compared to recent days. Small risk of a thunderstorm.
Chance of cloud-free hill tops
40% at first, increasing to 60% during the day.
Maximum wind speed expected
Southwesterly 15-20mph gusting up to 40 mph at times.
Temperature
- At 600m Plus 7 Celsius rising to plus 10 Celsius.
- Valley Plus 6 Celsius rising to plus 15 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Around 400m at first, but lifting during the day. Cloud bases lowering in heavy showers to 400-500m.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Wed 20 May
Further showers possible but detail uncertain. Temperatures rising. Strong southwesterly winds.
Thu 21 May
Early fog clearing then a fine day with plenty of sunshine. Warmer with moderate southerly winds.
Fri 22 May
A dry and rather warm day with strong sunshine, hazy at times. Wind easing.
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.