Mountain weather
Bannau Brycheiniog / Brecon Beacons
Confidence
High for overall story, moderate on position of showers through Wednesday and low into shower regime Friday into Saturday.
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This eveningSunrise:Sunset:
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Wed 20 MaySunrise:Sunset:
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Thu 21 MaySunrise:Sunset:
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Further outlook
This evening forecast
Showers persisting this evening, often merging into longer spells of rain, gradually easing through the second part of the night. Remaining breezy and mild.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Severe Chill Effect
Heavy Persistent Rain
Strong Sunlight
Mountain weather forecast
Isolated light showers with patchy low level cloud around.
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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 | ||||||||
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
60%
|
40%
|
30%
|
20%
|
10%
|
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 | SW 23mph knots
SW
23mph |
SW 22mph knots
SW
22mph |
W 20mph knots
W
20mph |
SW 22mph knots
SW
22mph |
SW 23mph knots
SW
23mph |
SW 22mph knots
SW
22mph |
SW 18mph knots
SW
18mph |
SW 17mph knots
SW
17mph |
|
300m
|
300m | SW 14mph knots
SW
14mph |
W 13mph knots
W
13mph |
W 13mph knots
W
13mph |
SW 15mph knots
SW
15mph |
SW 17mph knots
SW
17mph |
SW 16mph knots
SW
16mph |
SW 13mph knots
SW
13mph |
SW 10mph knots
SW
10mph |
|
Valley
|
Valley | SW 12mph knots
SW
12mph |
W 10mph knots
W
10mph |
W 11mph knots
W
11mph |
W 13mph knots
W
13mph |
SW 15mph knots
SW
15mph |
SW 14mph knots
SW
14mph |
SW 11mph knots
SW
11mph |
SW 8mph knots
SW
8mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 32mph | 30mph | 28mph | 30mph | 32mph | 30mph | 26mph | 25mph |
|
300m
|
300m | 29mph | 27mph | 24mph | 28mph | 30mph | 29mph | 24mph | 20mph |
|
Valley
|
Valley | 28mph | 24mph | 23mph | 27mph | 29mph | 27mph | 22mph | 18mph |
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C |
|
300m
|
300m | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 13 degrees Celsius 13°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C |
|
Valley
|
Valley | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 14 degrees Celsius 14°C | 14 degrees Celsius 14°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C |
| Freezing Level | Freezing Level |
1800m
|
1800m
|
1800m
|
1900m
|
2200m
|
2300m
|
1900m
|
2100m
|
|
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 | 5 degrees Celsius 5°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C |
|
300m
|
300m | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C |
|
Valley
|
Valley | 8 degrees Celsius 8°C | 8 degrees Celsius 8°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 |
1800m
|
1800m
|
1800m
|
1900m
|
2200m
|
2300m
|
1900m
|
2100m
|
Additional weather information
Meteorologist's view
Showery conditions will allow for surfaces to remain wet and slippery for much of the day meaning appropriate footwear is advised. Waterproof clothing is also advisable throughout the day.
Weather
Cloudy with isolated light to moderate showers at first, showers turning more isolated and lighter through the morning before cloud begins to thicken from the south through the afternoon, this may allow for the odd spot of light rain to develop. Brighter spells likely to develop near dusk with some clear spells likely overnight.
Chance of cloud-free hill tops
Widespread cloud initially above 600-700m, main cloud layer will then rise to 700-800m, and eventually well above highest peaks, with patchy cloud above 600m. Through the afternoon cloud likely to drop to 400-600m, before breaking up into the evening. Good to very good visibility outside any low cloud or within showers, visibility turning very poor or poor in any hill fog initially or from afternoon onward.
Low cloud and visibility
40% rising to 80% through the morning, dropping to 20% for a time from afternoon onwards.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
A cloudy and potentially drizzly start to the day as low cloud feeds in from the southwest. Cloud expected to gradually lift and break through the morning to leave a dry and brighter afternoon with sunny periods. Staying dry into the night with clear skies. Feeling much warmer.
Chance of cloud-free hill tops
20% initially, gradually rising to 40% by noon and then 90% soon after.
Maximum wind speed expected
Southwesterly 25-30 mph.
Temperature
- At 600m Plus 13 Celsius rising to Plus 20 Celsius.
- Valley Plus 8 Celsius rising to Plus 14 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Cloud initially above 300-500m gradually rising through the morning to 500-700m, before breaking up and rising above summits.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Fri 22 May
A dry and warm day with strong sunshine, hazy at times. Potentially for heavy and thundery showers through the evening. Wind easing. Freezing levels above summits.
Sat 23 May
Any lingering early morning cloud quickly clearing to leave a dry and bright day with plenty of sunny spells. Freezing levels above summits.
Sun 24 May
Another dry and bright day with plenty of sunshine and light winds. Freezing levels above summits.
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.