Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for changeable weather. Low for extent of rain on Friday night into Saturday.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
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.
Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
Mountain weather forecast
Windy with showers or occasionally longer spells of rain
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
10% | 40% | 80% | 40% | 10% | 90% |
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
24
|
SW
28
|
SW
30
|
W
26
|
SW
23
|
SW
20
|
| 300m |
SW
13
|
SW
15
|
SW
18
|
W
16
|
SW
13
|
SW
12
|
| Valley |
SW
11
|
SW
12
|
SW
15
|
W
14
|
SW
10
|
SW
11
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 32 | 37 | 40 | 35 | 32 | 27 |
| 300m | 29 | 34 | 36 | 33 | 28 | 26 |
| Valley | 28 | 30 | 35 | 31 | 26 | 25 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
6°
|
6°
|
6°
|
5°
|
4°
|
4°
|
| 300m |
8°
|
8°
|
8°
|
7°
|
6°
|
6°
|
| Valley |
8°
|
9°
|
9°
|
8°
|
7°
|
7°
|
| Freezing Level |
1,300m
|
1,300m
|
1,500m
|
1,200m
|
1,000m
|
1,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
0°
|
0°
|
0°
|
-1°
|
-2°
|
-1°
|
| 300m |
4°
|
5°
|
4°
|
3°
|
2°
|
2°
|
| Valley |
6°
|
6°
|
5°
|
4°
|
4°
|
4°
|
Additional weather information
Meteorologist's view
Strong winds will make for slow progress at height, and temporary drenching conditions in rain.
Weather
Often cloudy with occasional showers until late afternoon. These will be occasionally heavy and may merge into some longer spells of rain in the afternoon, with the low risk of a rumble of thunder. Drier and clearer weather briefly. Then a band of cloud and rain approaching from the south west during the late evening, with spells of heavy rain. Chance of rain turning wintry towards midnight on the highest summits.
Chance of cloud-free hill tops
70% becoming 50% during the evening.
Low cloud and visibility
Mostly good visibility with patchy cloud above 800 metres, occasionally lowering to 600 metres as showers pass by. During the evening, occasional cloud falling to 600 m with isolated areas to 400m in heavier spells of rain. Visibility in rain or sleet moderate to poor.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 5.2mm | 9.8mm | 9.8mm |
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
Cloudy with rain during the morning, rain briefly turning to sleet or wet snow during the early hours and during the afternoon as it clears. Drier and eventually clearer weather will spread from the west during the afternoon but isolated showers remain until late evening. Colder northwesterly winds setting in during the afternoon and evening with higher summit gales.
Chance of cloud-free hill tops
50%, becoming near-Nil during the afternoon, 90% later.
Maximum wind speed expected
Northwesterly 35 mph with gust 50 mph on the very highest tops in the afternoon
Temperature
- At 600m Plus 5 falling to plus 2 Celsius
- Valley Plus 6 rising to plus 8 Celsius.
- Freezing level Above summits falling to 800 metres
Low cloud and visibility
Poor in rain and widespread hill fog down to 400 to 600 metres, this lifting off the hills from the west as rain and snow clears from the west. Isolated cloud falling to 500 to 800 metres in showers later with moderate visibility.
Mountain weather information
Sun 30 Nov
Sunrise:
Sunset:
Variable amounts of cloud a few wintry showers, these dying out in the afternoon. Strengthening southwesterly winds will bring rain from the west later in the evening.
Mon 1 Dec
Sunrise:
Sunset:
Extensive hill fog along with persistent rain and strong southwesterly winds, this likely to clear from the west later in the day.
Tue 2 Dec
Sunrise:
Sunset:
Windy with clear spells and showers, occasionally heavy.
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.