Mountain weather
Bannau Brycheiniog / Brecon Beacons
Confidence
High overall then uncertainty in frontal progression from Saturday night.
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This eveningSunrise:Sunset:
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Sat 16 MaySunrise:Sunset:
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Sun 17 MaySunrise:Sunset:
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Further outlook
This evening forecast
Dry this evening with skies clearing. Turning chilly with some patchy frost possible.
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
Thunderstorms
Heavy Persistent Rain
Mountain weather forecast
A dry and bright start but clouding over with rain 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 | ||||||||
|
Chance of
precipitation (at 800m)
|
Chance of precipitation |
20%
|
20%
|
20%
|
30%
|
40%
|
80%
|
80%
|
80%
|
Wind direction and speed
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
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21:00
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|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | W 7mph knots
W
7mph |
W 6mph knots
W
6mph |
W 6mph knots
W
6mph |
W 8mph knots
W
8mph |
SW 10mph knots
SW
10mph |
SW 13mph knots
SW
13mph |
SW 13mph knots
SW
13mph |
SW 11mph knots
SW
11mph |
|
300m
|
300m | W 4mph knots
W
4mph |
SW 4mph knots
SW
4mph |
SW 3mph knots
SW
3mph |
W 6mph knots
W
6mph |
W 8mph knots
W
8mph |
SW 10mph knots
SW
10mph |
SW 9mph knots
SW
9mph |
SW 6mph knots
SW
6mph |
|
Valley
|
Valley | W 4mph knots
W
4mph |
SW 3mph knots
SW
3mph |
W 1mph knots
W
1mph |
W 5mph knots
W
5mph |
SW 7mph knots
SW
7mph |
SW 9mph knots
SW
9mph |
SW 8mph knots
SW
8mph |
SW 6mph knots
SW
6mph |
Wind gust
|
Time
|
Time |
00:00
|
03:00
|
06:00
|
09:00
|
12:00
|
15:00
|
18:00
|
21:00
|
|---|---|---|---|---|---|---|---|---|---|
|
600m
|
600m | 12mph | 9mph | 9mph | 12mph | 15mph | 18mph | 19mph | 16mph |
|
300m
|
300m | 10mph | 7mph | 6mph | 11mph | 15mph | 17mph | 18mph | 13mph |
|
Valley
|
Valley | 10mph | 6mph | 5mph | 10mph | 14mph | 17mph | 16mph | 14mph |
|
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 | 2 degrees Celsius 2°C | 4 degrees Celsius 4°C | 6 degrees Celsius 6°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C | 6 degrees Celsius 6°C |
|
300m
|
300m | 4 degrees Celsius 4°C | 3 degrees Celsius 3°C | 6 degrees Celsius 6°C | 9 degrees Celsius 9°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 10 degrees Celsius 10°C | 8 degrees Celsius 8°C |
|
Valley
|
Valley | 5 degrees Celsius 5°C | 4 degrees Celsius 4°C | 6 degrees Celsius 6°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 |
| Freezing Level | Freezing Level |
1000m
|
1000m
|
1000m
|
1200m
|
1400m
|
1700m
|
1600m
|
1700m
|
|
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 | 3 degrees Celsius 3°C | 4 degrees Celsius 4°C | 4 degrees Celsius 4°C | 3 degrees Celsius 3°C | 3 degrees Celsius 3°C |
|
300m
|
300m | 3 degrees Celsius 3°C | 2 degrees Celsius 2°C | 4 degrees Celsius 4°C | 7 degrees Celsius 7°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 7 degrees Celsius 7°C | 7 degrees Celsius 7°C |
|
Valley
|
Valley | 4 degrees Celsius 4°C | 3 degrees Celsius 3°C | 5 degrees Celsius 5°C | 8 degrees Celsius 8°C | 9 degrees Celsius 9°C | 9 degrees Celsius 9°C | 8 degrees Celsius 8°C | 8 degrees Celsius 8°C |
| Freezing Level | Freezing Level |
1000m
|
1000m
|
1000m
|
1200m
|
1400m
|
1700m
|
1600m
|
1700m
|
Additional weather information
Meteorologist's view
Rainfall combined with low cloud are expected to reduce visibility on exposed terrain, with saturated surfaces increasing the risk of slips and difficult footing.
Weather
A chilly start but dry and largely cloud free through the early hours. Soon clouding over from the west during the morning. Gradually turning unsettled from the west from midday with light, patchy outbreaks of rain.
Chance of cloud-free hill tops
70% until midday, dropping to 20%
Low cloud and visibility
Cloud tops dropping from midday to around 400-500m alongside patchy rain. Good visibility to start but becoming moderate to poor in low cloud and rain.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Weather
Rain clearing overnight to a mostly dry morning. Clouding over during the afternoon with a risk of showers. These could turn heavy. Rain becoming more persistent into the evening.
Chance of cloud-free hill tops
80% lowering to 40%
Maximum wind speed expected
Westerly, 25 mph
Temperature
- At 600m Plus 3 Celsius rising to plus 6 Celsius.
- Valley Plus 2 Celsius rising to plus 14 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Cloud bases lowering through the afternoon as more persistent spells of rain push in from the west. Visibility generally good but dropping to poor in low cloud and spells of rain.
Ground conditions
No recent ground conditions report available.
Mountain weather information
Mon 18 May
Spells of rain and showers. This heavy at times. Moderate to strong southerly winds.
Tue 19 May
Another unsettled day with heavy rain and showers. Strong southwesterly winds.
Wed 20 May
Drier and brighter. Moderate southwesterly winds.
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.