Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence in the generally settled weather and temperatures turning very cold over the next few days. Lower confidence in the details of any wintry precipitation on Thursday.
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.
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
A dry and cold day, mist and fog in places in the morning but some sunshine developing later in the morning. Feeling very cold higher on the mountains in light northeasterly winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
<05% | <05% | <05% | <05% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
NE
19
|
E
19
|
E
17
|
E
17
|
E
19
|
NE
18
|
| 300m |
E
13
|
E
9
|
E
10
|
E
10
|
E
11
|
NE
9
|
| Valley |
E
12
|
E
7
|
E
10
|
E
10
|
E
10
|
NE
8
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 28 | 29 | 24 | 23 | 27 | 26 |
| 300m | 24 | 19 | 19 | 19 | 22 | 21 |
| Valley | 24 | 16 | 19 | 20 | 21 | 21 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
0°
|
0°
|
0°
|
0°
|
0°
|
1°
|
| 300m |
2°
|
2°
|
3°
|
3°
|
3°
|
3°
|
| Valley |
3°
|
3°
|
4°
|
4°
|
4°
|
4°
|
| Freezing Level |
500m
|
500m
|
600m
|
600m
|
600m
|
700m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-7°
|
-7°
|
-6°
|
-6°
|
-6°
|
-5°
|
| 300m |
-3°
|
-2°
|
-1°
|
-1°
|
-1°
|
-1°
|
| Valley |
-2°
|
-1°
|
1°
|
1°
|
0°
|
0°
|
Additional weather information
Meteorologist's view
Wind-chill a possibility due to the cold northeasterly winds, making it feel very cold on the summits. Apart from this conditions will be good for walking, so if heading out layers would be advised.
Weather
Monday will start misty in some areas, with hill fog possible and frost. Any low cloud will clear during the morning with sunny spells then developing. Patchy cloud at times through the day, leading in to a dry evening with mist and fog forming again in places overnight. A risk of frost overnight.
Chance of cloud-free hill tops
80%, patchy or scattered amounts of cloud forming around the hills.
Low cloud and visibility
Generally all summits will be clear at times on Monday but patchy or scattered amounts of low cloud may affect the hill tops at times in the morning and overnight, most likely in the east. Visibility will be moderate or poor in mist and low cloud, but very poor in any fog patches. However, generally the visibility will be good for most of the day.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0.2mm | 0.2mm |
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
Another very cold day, with fresh northeasterly winds enhancing the cold feel. A dry and bright day with plenty of weak winter sunshine. Widespread frost overnight.
Chance of cloud-free hill tops
95%
Maximum wind speed expected
Northeasterly 10-15mph.
Temperature
- At 600m Minus 1 Celsius.
- Valley Zero rising to Plus 3 Celsius.
- Freezing level around 400-500m
Low cloud and visibility
Most cloud expected to be above the summits with very good visibility and good far-reaching views.
Mountain weather information
Wed 31 Dec
Sunrise:
Sunset:
Another cold but dry and sunny day to finish the year. Strong northerly winds will make it feel bitterly cold, perhaps more cloud later in the day. Freezing level 400-600m.
Thu 1 Jan
Sunrise:
Sunset:
Showers are a possibility for the new year, turning wintry at height, with more cloud than recent days and strong northwesterly winds expected leading to severe wind-chill. Poor visibility in wintry showers expected on the mountains. Freezing level 400-600m.
Fri 2 Jan
Sunrise:
Sunset:
A continuation of the cold conditions, with fresh or strong north or northwesterly winds. Some bright weather, but risk of some wintry showers. Freezing level 400-600m.
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.