Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for unsettled and changeable conditions but lower confidence for day to day timings of rain so please keep updated with the latest forecast.
This evening forecast
A dry start then outbreaks of rain, with extensive cloud above 600m, will develop late in the evening. Strong westerly or southwesterly winds on the tops. Freezing level above summits.
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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
Mountain weather forecast
Dry start then rain becoming heavy and persistent in the afternoon. Strong to gale force winds.
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 600m) |
80% | 60% | 30% | 30% | 60% | >95% | >95% | >95% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
W
26
|
W
24
|
W
22
|
SW
21
|
SW
21
|
SW
23
|
SW
25
|
SW
26
|
| 300m |
W
15
|
W
15
|
SW
12
|
SW
13
|
SW
13
|
SW
15
|
SW
16
|
SW
17
|
| Valley |
W
13
|
W
12
|
SW
11
|
SW
12
|
SW
11
|
SW
13
|
SW
14
|
SW
14
|
Wind gust (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m | 35 | 33 | 30 | 28 | 29 | 32 | 36 | 37 |
| 300m | 33 | 31 | 25 | 26 | 27 | 30 | 33 | 34 |
| Valley | 31 | 28 | 25 | 25 | 25 | 28 | 30 | 30 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
6°
|
6°
|
6°
|
6°
|
8°
|
8°
|
8°
|
8°
|
| 300m |
8°
|
8°
|
8°
|
8°
|
10°
|
10°
|
10°
|
10°
|
| Valley |
9°
|
9°
|
9°
|
9°
|
10°
|
11°
|
10°
|
10°
|
| Freezing Level |
1,800m
|
1,700m
|
1,400m
|
1,400m
|
2,300m
|
2,300m
|
2,100m
|
2,300m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
1°
|
1°
|
1°
|
1°
|
3°
|
4°
|
3°
|
3°
|
| 300m |
5°
|
5°
|
5°
|
5°
|
7°
|
7°
|
6°
|
6°
|
| Valley |
6°
|
6°
|
6°
|
6°
|
8°
|
8°
|
7°
|
7°
|
Additional weather information
Meteorologist's view
A windy day on higher slopes with gusts of 40 to 50mph above 600m making progress slow at times. Drenching conditions during the afternoon and evening in the wind and rain. Good navigation skills will also be required due to the low cloud.
Weather
Persistent rain clearing overnight then a dry start. Outbreaks of rain will develop from late morning, turning heavy at times and continuing for the rest of the afternoon and evening. Drenching conditions setting in through the afternoon due to the rain combined with strong to gale force winds.
Chance of cloud-free hill tops
60% in the morning becoming less than 10% in afternoon.
Low cloud and visibility
Patchy cloud and fog above 500 or 600m overnight and during the morning but good visibility at times below the cloud. Visibility becoming generally poor as cloud and fog become extensive above 300m in the afternoon with patches down to valley level.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 8.2mm | 15.2mm | 17.8mm |
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
Heavy rain clearing overnight. A drier day with bright or sunny spells and the odd passing shower. Mild in the valleys but feeling rather cold on the tops in the strong winds.
Chance of cloud-free hill tops
10% overnight, becoming 80% during morning.
Maximum wind speed expected
Southwest 20 to 30mph gusts 40 to 50mph.
Temperature
- At 600m Plus 6C.
- Valley Plus 10 to 12C.
- Freezing level Above summits.
Low cloud and visibility
Extensive low cloud clearing away overnight. Mainly good visibility during the day but patchy cloud above 600m with occasional deteriorations in any showers.
Mountain weather information
Mon 23 Feb
Sunrise:
Sunset:
Mainly cloudy with outbreaks of rain in the morning, turning heavy and persistent for a time in the afternoon. Strong to gale force southwest winds. Freezing level above summits.
Tue 24 Feb
Sunrise:
Sunset:
Mainly cloudy with patchy light rain or drizzle but some brightness at times. Windy on the tops but mild with freezing level above summits.
Wed 25 Feb
Sunrise:
Sunset:
Cloudy and mild with patchy rain. Wind easing. Freezing level above 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.