Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for rain clearing north overnight and a fine day on Thursday. Confidence lower for arrival time of heavier rain and wind details on Friday but higher again for more settled conditions developing over the weekend.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Poor Visibility
Poor visibility presents challenging route finding conditions. Visibility could be significantly less than 50 metres in all directions with few or no visual references, especially on featureless moors or plateaux. Distances become hard to judge and cliff or cornice edges can be difficult to recognise. These conditions require good navigational skills. There is a risk of white-out conditions when mist or fog is combined with extensive snow cover.
Mountain weather forecast
Dry with bright or sunny spells. Strong southerly or southwesterly winds easing
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
20% | 10% | <05% | <05% | <05% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
SW
20
|
SW
17
|
SW
14
|
S
6
|
E
8
|
E
12
|
| 300m |
SW
10
|
SW
9
|
SW
9
|
SW
3
|
E
4
|
E
5
|
| Valley |
SW
9
|
SW
8
|
SW
6
|
SE
3
|
E
4
|
E
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 26 | 22 | 18 | 8 | 11 | 17 |
| 300m | 22 | 19 | 16 | 7 | 8 | 12 |
| Valley | 22 | 19 | 14 | 6 | 8 | 11 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
9°
|
9°
|
10°
|
10°
|
9°
|
9°
|
| 300m |
11°
|
11°
|
12°
|
12°
|
10°
|
10°
|
| Valley |
12°
|
12°
|
13°
|
13°
|
10°
|
10°
|
| Freezing Level |
1,700m
|
1,600m
|
1,600m
|
1,600m
|
1,700m
|
1,800m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
5°
|
6°
|
6°
|
8°
|
7°
|
6°
|
| 300m |
9°
|
9°
|
11°
|
12°
|
9°
|
9°
|
| Valley |
10°
|
10°
|
12°
|
13°
|
10°
|
10°
|
Additional weather information
Meteorologist's view
Make the most of a drier day before a very wet and windy day on Friday.
Weather
Cloud and outbreaks of rain clearing north soon after midnight to leave a dry night with clear spells developing. Then a bright and dry day start with some spells of sunshine developing, however the sunshine looks set to become increasingly hazy through the afternoon as cloud above the summit increases. Cloud thickens through the evening bringing outbreaks of rain north towards midnight.
Chance of cloud-free hill tops
Around 75% at first rising to 90% by mid-morning falling to 75% through the morning. Chances falling a little in the evening.
Low cloud and visibility
Occasional cloud above 450-600m at first lifting and breaking with only small amounts of cloud below the summits by late morning, however occasional or periods cloud above 600-750m develop in the evening. Away from cloud visibility very good or excellent, falling to several kilometres at times in rain.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 26.4mm | 51.8mm | 59.2mm |
Measurement date:
Rainfall data provided by Natural Resources Wales. The Met Office is not responsible for content provided by third parties and may remove this data without warning.
Mountain weather information
Weather
Outbreaks of heavy rain spread quickly north through the early hours to give a very wet and windy day with persistent and often heavy rain throughout. Conditions underfoot becoming very wet with water courses likely to become swollen and fast moving. A severe chill effect at higher elevations will develop.
Chance of cloud-free hill tops
Around 25% in the far west, otherwise little or no chance.
Maximum wind speed expected
Northeasterly 15-20mph increasing 30-35mph through the early hours, with gusts 40-55mph over ridges and summits, and perhaps at lower levels on downwind slopes.
Temperature
- At 600m Around plus 7 Celsius falling to plus 3 Celsius
- Valley Plus 8 or 9 Celsius rising to plus 12 Celsius
- Freezing level Above summits, but falling later
Low cloud and visibility
Periods or persistent cloud above about 450-600m, with patches below, but becoming more occasional above 750m at times in the far west.
Mountain weather information
Sat 15 Nov
Sunrise:
Sunset:
Heavy persistent rain dying out through the early hours but remaining cloudy with occasional, mainly light rain. Occasionally strong northeasterly winds. Freezing level above the summits.
Sun 16 Nov
Sunrise:
Sunset:
Any patchy overnight rain soon clearing then dry with some good spells of sunshine developing. Occasionally strong northeasterly winds easing. Freezing level just above the summits.
Mon 17 Nov
Sunrise:
Sunset:
Mainly dry with some good spells of sunshine. Occasionally fresh northerly or northeasterly winds. Freezing level above the summits.
Updated at:
Summit specific forecast
Mountain summit forecast map
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Key
Mountain summits
Other points of interest
Cluster of multiple stations
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.