Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for Friday. Low for extent of any showers over the weekend and early next week.
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.
Mountain weather forecast
Variable amounts of cloud and occasional showers.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
30% | 20% | 40% | 50% | 60% | 50% |
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
16
|
S
16
|
S
19
|
S
22
|
S
21
|
S
19
|
| 300m |
SW
8
|
S
9
|
S
10
|
S
10
|
SE
9
|
S
11
|
| Valley |
SW
7
|
S
6
|
S
8
|
SE
7
|
E
5
|
SE
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 20 | 20 | 25 | 29 | 28 | 26 |
| 300m | 18 | 19 | 20 | 22 | 22 | 23 |
| Valley | 19 | 18 | 19 | 18 | 12 | 17 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
2°
|
2°
|
3°
|
4°
|
3°
|
3°
|
| 300m |
4°
|
3°
|
6°
|
6°
|
4°
|
5°
|
| Valley |
4°
|
4°
|
7°
|
7°
|
5°
|
5°
|
| Freezing Level |
900m
|
900m
|
1,000m
|
1,000m
|
1,000m
|
1,100m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-3°
|
-4°
|
-3°
|
-2°
|
-3°
|
-2°
|
| 300m |
1°
|
0°
|
2°
|
3°
|
1°
|
1°
|
| Valley |
2°
|
1°
|
4°
|
5°
|
4°
|
3°
|
Additional weather information
Meteorologist's view
Strengthening summit winds developing from late afternoon onwards.
Weather
Misty with some valley fog during Friday morning. Variable amounts of cloud and passing showers, these most likely first thing and again later in the afternoon. Some sleet or wet snow on the highest summits. Some drier and brighter spells of weather expected too.
Chance of cloud-free hill tops
60%.
Low cloud and visibility
Scattered to broken bases around 400 metres as showers pass by, but this may be more extensive first thing in the morning and again later in the evening.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.4mm | 2.4mm | 5.4mm |
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
Misty and mostly cloudy with passing showers, these most likely in the morning with the chance of a heavy shower. More in the way of brighter skies and fewer showers in the afternoon.
Chance of cloud-free hill tops
50%, best chance in the afternoon.
Maximum wind speed expected
South or southeasterly 25mph across summits.
Temperature
- At 600m Plus 3 Celsius.
- Valley Plus 3 rising to 7 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Poor in broken cloud down to 400 metres as showers pass by, otherwise good visibility with patchy cloud above 800 metres.
Mountain weather information
Sun 18 Jan
Sunrise:
Sunset:
Variable amounts of cloud and the chance of showers, perhaps some longer spells of rain developing for a time. Showers wintry on the higher tops.
Mon 19 Jan
Sunrise:
Sunset:
Some drier spells of weather and a chance of showers, wintry on the higher tops.
Tue 20 Jan
Sunrise:
Sunset:
Little change, still a chance of showers but spells of dry weather too.
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.