Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for east to southeast flow persisting also for relatively unsettled, but lowering for timing detail of worst of conditions.
This evening forecast
Rain at first, above 800m snow, clearing towards midnight. Severe wind chill at height in strong southeast summit winds. Freezing level around 900m.
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.
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
Fair start, then periods of rain from late morning. Strong southeast summit 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) |
10% | 10% | 10% | 70% | 80% | 80% | 90% | 80% |
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 |
S
17
|
S
19
|
SE
23
|
SE
31
|
S
29
|
S
30
|
SE
28
|
SE
25
|
| 300m |
S
7
|
S
8
|
SE
10
|
SE
18
|
SE
16
|
SE
18
|
SE
16
|
SE
15
|
| Valley |
S
5
|
SE
5
|
SE
8
|
E
14
|
SE
13
|
SE
16
|
SE
14
|
SE
13
|
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 | 23 | 24 | 31 | 42 | 39 | 41 | 38 | 35 |
| 300m | 17 | 18 | 22 | 36 | 33 | 36 | 33 | 31 |
| Valley | 15 | 15 | 21 | 32 | 31 | 35 | 32 | 30 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
2°
|
1°
|
2°
|
3°
|
6°
|
7°
|
6°
|
6°
|
| 300m |
4°
|
3°
|
3°
|
4°
|
8°
|
8°
|
8°
|
8°
|
| Valley |
4°
|
3°
|
4°
|
4°
|
9°
|
9°
|
8°
|
8°
|
| Freezing Level |
900m
|
800m
|
800m
|
1,500m
|
1,700m
|
1,700m
|
1,700m
|
1,500m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-4°
|
-5°
|
-5°
|
-5°
|
1°
|
1°
|
0°
|
0°
|
| 300m |
1°
|
0°
|
0°
|
-1°
|
4°
|
4°
|
4°
|
4°
|
| Valley |
3°
|
1°
|
1°
|
0°
|
6°
|
6°
|
5°
|
5°
|
Additional weather information
Meteorologist's view
Severe wind chill effect receding as the freezing level lifts later in the day.
Weather
Patchy rain and above 700-800m snow, at first overnight, clearing before dawn as the cloud becomes more broken. Cloud soon thickening from the south, bringing patchy rain by mid-morning. Outbreaks turning more persistent and heavy for the afternoon, before weakening mid to late evening.
Chance of cloud-free hill tops
40% becoming 10-20% from late morning
Low cloud and visibility
Good or very good, becoming moderate or poor in rain, very poor in snow and within cloud with bases becoming quite extensive from 600m from late morning with patches lower down for the afternoon.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 8mm | 8.8mm | 11mm |
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 occasional rain, which turns heavier at times for the afternoon and evening. Strong southeast summit winds bringing a severe wind chill to higher peaks.
Chance of cloud-free hill tops
20%
Maximum wind speed expected
Southeast mean 20-30mph with gusts reaching 40mph across exposed ridges and summits.
Temperature
- At 600m Plus 5-6 Celsius
- Valley Plus 7 Celsius increasing 10 Celsius for the afternoon
- Freezing level Above summits
Low cloud and visibility
Good or very good, becoming moderate or poor in rain, very poor within cloud with bases quite extensive from 600m with patches lower down.
Mountain weather information
Fri 23 Jan
Sunrise:
Sunset:
Showers or longer periods of rain, with snow above 800m. Strong southeast summit winds bringing a severe wind chill at height. Freezing level around 900m.
Sat 24 Jan
Sunrise:
Sunset:
Mainly cloudy with some patchy light rain and summit snow. Fresh to strong easterly winds. Freezing level around 800m.
Sun 25 Jan
Sunrise:
Sunset:
Mainly cloudy with patchy light rain and summit snow. Fresh easterly winds. Freezing level around 700-800m.
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.