Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence for very cold conditions persisting for much of the time, then low confidence for a change to slightly milder and wetter conditions at the end of the outlook period.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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 Snow
Heavy snow can lead to rapid changes in underfoot conditions and paths may become treacherous or hidden. It also brings very poor visibility and often makes navigation much more challenging. When deep snow accumulates progress is often time consuming and strenuous, significantly affecting the distance one can travel on foot. Deep drifts can develop if snow is combined with strong winds. A heightened avalanche risk is possible and avalanche reports should be consulted where available.
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
Chance of occasional light snow at first today, then becoming mainly dry. Feeling very cold with a severe windchill.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
60% | 30% | 60% | 20% | 20% | 20% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
NW
21
|
N
17
|
NW
20
|
NW
19
|
NW
20
|
NW
18
|
| 300m |
NW
10
|
NW
5
|
NW
9
|
NW
8
|
NW
7
|
NW
7
|
| Valley |
NW
8
|
NW
4
|
NW
8
|
NW
7
|
W
6
|
NW
6
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 26 | 22 | 26 | 25 | 25 | 25 |
| 300m | 22 | 16 | 20 | 18 | 17 | 17 |
| Valley | 20 | 16 | 19 | 17 | 17 | 18 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
0°
|
-2°
|
-2°
|
-1°
|
-2°
|
-2°
|
| 300m |
1°
|
-1°
|
1°
|
1°
|
0°
|
0°
|
| Valley |
2°
|
0°
|
2°
|
2°
|
1°
|
0°
|
| Freezing Level |
500m
|
200m
|
200m
|
300m
|
200m
|
100m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-7°
|
-9°
|
-9°
|
-8°
|
-9°
|
-9°
|
| 300m |
-3°
|
-3°
|
-3°
|
-2°
|
-3°
|
-4°
|
| Valley |
-1°
|
-2°
|
-2°
|
-1°
|
-2°
|
-3°
|
Additional weather information
Meteorologist's view
Severe wind chill in strong northwesterly winds. Risk of ice and frost on paths and access roads and full winter conditions are to be expected on the mountains on Friday with snow accumulations on the mountains.
Weather
Chance of outbreaks of light snow at first today, with isolated light snow showers following. The Brecon Beacons will see a lot of bright and dry conditions outside of these showers and some weak winter sunshine but it will be extremely cold with air temperatures barely rising above freezing at low levels.
Chance of cloud-free hill tops
30% increasing 80% this morning.
Low cloud and visibility
Areas of cloud above 500m at first, these clearing by mid-morning then patchy cloud around 600m with any snow showers. Generally very good visibility with good clarity and far reaching views outside of showers. In any wintry showers visibility may drop poor or even very poor for a time.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 1.8mm | 2mm | 2.4mm |
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
Mainly dry and clear or sunny, with perhaps some isolated light snow showers, these most likely across western areas. Remaining very cold with a severe windchill.
Chance of cloud-free hill tops
90%, patchy cloud only.
Maximum wind speed expected
Northwesterly 20 gust 30mph.
Temperature
- At 600m Minus 4 Celsius.
- Valley Minus 3 Celsius rising to zero Celsius.
- Freezing level Surface Level
Low cloud and visibility
Some patchy cloud above 500m but most summits clear with excellent visibility.
Mountain weather information
Sun 4 Jan
Sunrise:
Sunset:
Clear, cold conditions overnight and a bright day with perhaps some isolated wintry showers, remaining very cold with light to moderate northwesterly winds. Freezing at all levels.
Mon 5 Jan
Sunrise:
Sunset:
Continuing with cold but settled conditions, mostly dry with light to moderate northwesterly winds,
Tue 6 Jan
Sunrise:
Sunset:
Cloud and hill fog may arrive, along with rain preceded by heavy snow. However, confidence is low regarding this as the cold conditions may persist.
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.