Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for unsettled and increasingly windy conditions through this period. Lower confidence for cloud and rain details which become more uncertain as we go through the 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
Mainly dry with sunny spells. Low cloud and outbreaks of rain spreading north and west in afternoon.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
10% | 10% | 40% | 40% | 30% | 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 |
S
10
|
S
12
|
SE
14
|
S
17
|
S
22
|
S
22
|
| 300m |
SE
2
|
E
4
|
E
3
|
SE
6
|
SE
8
|
S
13
|
| Valley |
NW
1
|
E
2
|
E
3
|
SE
4
|
SE
4
|
S
8
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 13 | 15 | 17 | 21 | 28 | 28 |
| 300m | 6 | 6 | 9 | 13 | 20 | 26 |
| Valley | 2 | 6 | 8 | 12 | 13 | 22 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
4°
|
4°
|
4°
|
4°
|
4°
|
4°
|
| 300m |
2°
|
3°
|
5°
|
6°
|
5°
|
6°
|
| Valley |
4°
|
4°
|
6°
|
7°
|
6°
|
6°
|
| Freezing Level |
1,200m
|
1,400m
|
1,400m
|
1,200m
|
1,300m
|
1,200m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
0°
|
0°
|
0°
|
0°
|
-2°
|
-2°
|
| 300m |
1°
|
2°
|
4°
|
4°
|
3°
|
2°
|
| Valley |
3°
|
3°
|
5°
|
6°
|
4°
|
4°
|
Additional weather information
Meteorologist's view
Valley temperatures may be below freezing places in the morning. A chance of sunshine with good views of a cloud inversion in the morning but note the more extensive low cloud spreading north during the afternoon giving some difficult navigation conditions.
Weather
Early patchy fog will be slow to clear. A largely fine and dry day follows for much of Bannau Brycheiniog, but with the likelihood of low cloud, rain and drizzle moving across eastern hills through the afternoon. Further rain, perhaps heavy, likely moving into westernmost hills after dark.
Chance of cloud-free hill tops
80% in morning, becoming 60% in the west, 20% in the east after midday.
Low cloud and visibility
Some patchy low cloud and valley fog below 300m during the morning but higher slopes remaining clear, due to the low inversion. Cloud becoming rather extensive from the south across western hills, and perhaps some central hills obscuring hills above 500m at times, and down to 300m with any rain or drizzle. Away from low cloud, mainly good visibility but a few kilometres at times in rain later.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 2.8mm | 3mm | 5mm |
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
Any overnight rain soon clearing. Then largely dry with a few bright or clear intervals. The main feature will be the strengthening southerly winds with severe gales on the tops in the afternoon. Outbreaks of rain spread east during the evening.
Chance of cloud-free hill tops
60%.
Maximum wind speed expected
South 20mph gusting 30mph, increasing to 40mph with gusts 60mph in afternoon,
Temperature
- At 600m Plus 3 Celsius rising to Plus 5 Celsius.
- Valley Plus 8 Celsius.
- Freezing level Above summits/
Low cloud and visibility
Occasional cloud cover above 600m for much of the day, but some clearer intervals likely. Outside of cloud visibility will be good, but falling to moderate with any rain.
Mountain weather information
Wed 21 Jan
Sunrise:
Sunset:
Some early drier and brighter weather, before cloud increases with occasional rain moving in. Windy with summit gales. Freezing level above summits.
Thu 22 Jan
Sunrise:
Sunset:
Mainly cloudy with showers or longer spells of rain, occasionally heavy and slow moving. Strong winds and summit gales easing. Freezing level remaining above summits.
Fri 23 Jan
Sunrise:
Sunset:
Remaining unsettled with showers or longer spells of rain and summit sleet. Fresh southerly winds. Freezing level above summits.
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.