Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for changeable weather to continue for the next few days. Low for precipitation detail on a daily basis.
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.
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.
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.
Mountain weather forecast
Wet and windy, with snow possible on the summits, and a drier spell for the afternoon.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
70% | 70% | 30% | 20% | 60% | 60% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
SE
23
|
SE
23
|
SE
24
|
SE
25
|
SE
27
|
SE
29
|
| 300m |
E
10
|
E
11
|
SE
13
|
SE
14
|
E
14
|
E
16
|
| Valley |
E
8
|
E
9
|
SE
12
|
E
13
|
E
13
|
E
15
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 31 | 30 | 32 | 34 | 37 | 40 |
| 300m | 23 | 25 | 28 | 29 | 30 | 34 |
| Valley | 22 | 23 | 26 | 29 | 30 | 34 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
3°
|
3°
|
3°
|
4°
|
3°
|
3°
|
| 300m |
5°
|
5°
|
6°
|
6°
|
5°
|
5°
|
| Valley |
5°
|
6°
|
7°
|
7°
|
6°
|
6°
|
| Freezing Level |
1,000m
|
1,000m
|
900m
|
900m
|
900m
|
1,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-4°
|
-4°
|
-3°
|
-3°
|
-4°
|
-4°
|
| 300m |
1°
|
1°
|
2°
|
2°
|
1°
|
1°
|
| Valley |
2°
|
2°
|
4°
|
4°
|
2°
|
2°
|
Additional weather information
Meteorologist's view
Strong winds on the summits, along with heavy rain and even snow at the highest altitudes will make for poor conditions and a risk of severe chill.
Weather
Widespread rain for the early morning, perhaps heavy at times, but clearing by late morning. Then drier in the afternoon with the odd shower. Further rain will spread north through the evening. Some sleet or wet snow can be expected above 900 metres.
Chance of cloud-free hill tops
60%, with the best chance in the afternoon.
Low cloud and visibility
Poor visibility in widespread rain, with cloud down to 300-400m in the morning. Visibility improving to good for the afternoon, with patchy cloud above 800m.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 6.8mm | 18.6mm | 36.8mm |
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
Overcast and windy with spells of rain, occasionally heavy.
Chance of cloud-free hill tops
50%
Maximum wind speed expected
Southeasterly average speeds 30 mph with gusts to 50 mph
Temperature
- At 600m Plus 4 Celsius
- Valley Plus 5 rising to 7 Celsius
- Freezing level Above the summits
Low cloud and visibility
Moderate to poor visibility in the precipitation, becoming good in dry spells. Cloud generally above 700m through the day, but could come down to 300-400m in any rain. Lowest bases across the east of the Park.
Mountain weather information
Sun 25 Jan
Sunrise:
Sunset:
Chance of some rain in the morning, followed by a few showers in the afternoon. Freezing level 700m.
Mon 26 Jan
Sunrise:
Sunset:
Starting off dry but rain is likely to spread northeast for a time late in the afternoon. Freezing level 500-600m.
Tue 27 Jan
Sunrise:
Sunset:
Little change, remaining unsettled with further spells of rain. This may turn to snow later on in the day. Freezing level 500-600m.
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.