Mountain weather
Bannau Brycheiniog / Brecon Beacons
Confidence
High for overall story, moderate for shower detail through Wednesday and lower Friday into Saturday.
-
Wed 20 MaySunrise:Sunset:
-
Thu 21 MaySunrise:Sunset:
-
Further outlook
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
Mountain weather forecast
Isolated light showers with areas of low level cloud around.
|
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 |
30%
|
30%
|
10%
|
20%
|
20%
|
20%
|
Wind direction and speed
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | SW 21mph knots
SW
21mph |
SW 23mph knots
SW
23mph |
SW 25mph knots
SW
25mph |
SW 23mph knots
SW
23mph |
SW 19mph knots
SW
19mph |
SW 17mph knots
SW
17mph |
|
300m
|
300m | W 11mph knots
W
11mph |
SW 15mph knots
SW
15mph |
SW 16mph knots
SW
16mph |
SW 16mph knots
SW
16mph |
SW 12mph knots
SW
12mph |
SW 9mph knots
SW
9mph |
|
Valley
|
Valley | W 10mph knots
W
10mph |
SW 13mph knots
SW
13mph |
W 15mph knots
W
15mph |
W 14mph knots
W
14mph |
SW 10mph knots
SW
10mph |
SW 7mph knots
SW
7mph |
Wind gust
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | 26mph | 30mph | 32mph | 29mph | 25mph | 24mph |
|
300m
|
300m | 23mph | 28mph | 29mph | 29mph | 24mph | 19mph |
|
Valley
|
Valley | 23mph | 27mph | 29mph | 28mph | 22mph | 18mph |
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | 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 | 9 degrees Celsius 9°C |
|
300m
|
300m | 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 |
|
Valley
|
Valley | 11 degrees Celsius 11°C | 12 degrees Celsius 12°C | 15 degrees Celsius 15°C | 14 degrees Celsius 14°C | 13 degrees Celsius 13°C | 12 degrees Celsius 12°C |
| Freezing Level | Freezing Level |
1800m
|
1900m
|
1800m
|
2400m
|
2000m
|
1900m
|
|
Time
|
Time |
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|
|
600m
|
600m | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C | 5 degrees Celsius 5°C |
|
300m
|
300m | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 11 degrees Celsius 11°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C | 9 degrees Celsius 9°C |
|
Valley
|
Valley | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 12 degrees Celsius 12°C | 12 degrees Celsius 12°C | 11 degrees Celsius 11°C | 10 degrees Celsius 10°C |
| Freezing Level | Freezing Level |
1800m
|
1900m
|
1800m
|
2400m
|
2000m
|
1900m
|
Additional weather information
Meteorologist's view
Showers will give some wet and slippery conditions. Feeling chilly in the strong winds. Poor navigation conditions during the morning, although this is expected to improve briefly, conditions are likely to deteriorate again during the afternoon. Despite this, Moderate UV levels are possible in any brighter spells, so sun protection should be considered.
Weather
Cloudy with scattered light to moderate showers at first. Showers turning more isolated and lighter through the morning, perhaps with some brighter spells developing, before cloud begins to thicken from the south through the afternoon, this may allow for the odd spot of light rain to develop.
Chance of cloud-free hill tops
30% at first, rising to 60% from late morning, then dropping to 30% again into the afternoon.
Low cloud and visibility
Widespread cloud initially above 400-600m, main cloud layer will then briefly rise to 600-800m. Into the afternoon areas of cloud with base 400-500m. Good to very good visibility outside any low cloud or showers, visibility turning moderate to very poor in any showers or hill fog.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
A cloudy and 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 20-25 mph, gusting 30-35 mph, gradually easing.
Temperature
- At 600m Plus 10 Celsius rising to Plus 14 Celsius.
- Valley Plus 10 Celsius rising to Plus 20 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. Potential for heavy and thundery showers through the evening. Moderate to fresh southerly winds. 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. Moderate southwesterly winds. Freezing levels above summits.
Sun 24 May
Another dry and bright day with plenty of sunshine and light winds. Moderate westerly winds. Freezing levels above summits.
Mountain weather information
Fri 22 May
A dry and warm day with strong sunshine, hazy at times. Potential for heavy and thundery showers through the evening. Moderate to fresh southerly winds. 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. Moderate southwesterly winds. Freezing levels above summits.
Sun 24 May
Another dry and bright day with plenty of sunshine and light winds. Moderate westerly 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.