Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Cloudy conditions on Tuesday with some mist and fog will be slow to clear but uncertainty over the chance of cloud breaks developing. A stormy period of weather likely towards the end of the week, keep an eye on latest forecasts.
This evening forecast
A dull evening with a lot of cloud shrouding the hills, mist and fog forming quite widely, light southwesterly winds.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Blizzards
Blizzards and whiteouts present challenging and serious conditions due to a combination of falling or blowing snow, strong winds and cold temperatures. They can be highly disorientating, often resulting in near-zero visibility with limited or no visual references and no distinction between ground and sky. Cliff edges and cornices may not be apparent, even close up. These conditions require very good navigational skills.
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
A misty and foggy start and quite dull with some outbreaks drizzle possible, perhaps brighter in the east for a 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) |
40% | 40% | 40% | 30% | 30% | 30% | 30% | 30% |
Wind direction and speed (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
S
10
|
S
10
|
S
10
|
S
12
|
S
11
|
S
8
|
SE
6
|
SE
6
|
| 300m |
SW
7
|
SW
6
|
S
5
|
S
6
|
S
7
|
S
5
|
SE
3
|
SE
2
|
| Valley |
SW
6
|
SW
5
|
SE
2
|
SE
3
|
S
6
|
S
3
|
E
2
|
NE
2
|
Wind gust (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m | 15 | 14 | 14 | 17 | 15 | 11 | 8 | 8 |
| 300m | 14 | 13 | 13 | 14 | 13 | 9 | 5 | 5 |
| Valley | 14 | 13 | 7 | 7 | 11 | 7 | 4 | 4 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
3°
|
2°
|
1°
|
1°
|
1°
|
2°
|
1°
|
0°
|
| 300m |
4°
|
4°
|
3°
|
2°
|
4°
|
4°
|
3°
|
1°
|
| Valley |
5°
|
4°
|
3°
|
2°
|
5°
|
5°
|
3°
|
2°
|
| Freezing Level |
1,000m
|
1,000m
|
900m
|
800m
|
800m
|
800m
|
800m
|
800m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
-1°
|
-2°
|
-3°
|
-4°
|
-3°
|
-2°
|
-2°
|
-3°
|
| 300m |
1°
|
1°
|
0°
|
0°
|
2°
|
2°
|
1°
|
0°
|
| Valley |
2°
|
2°
|
2°
|
1°
|
3°
|
4°
|
2°
|
0°
|
Additional weather information
Meteorologist's view
Mostly light south or southwesterly winds. Freezing level lowering later in the day so feeling colder later.
Weather
Likely to be misty with fog in valleys for much of the morning, remaining cloudy but tending to brighten a little around further east where there could be a few brighter spells in the afternoon before mist and fog is likely to reform.
Chance of cloud-free hill tops
30% chance of higher summits being clear above mist and fog in the morning.
Low cloud and visibility
chance of the higher summits being out of the fog and cloud early in the morning but otherwise scattered or broken low cloud above 200m as fog breaks and lifts, further east cloud will be more scattered above 400m with some breaks possible further east in the afternoon. Prepare for cloudy conditions on the summits. Visibility below the cloud will be good but turning moderate in any drizzly rain.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.2mm | 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
Cloudy with mist and fog, possibly freezing fog widely to start the day but some bright or sunny spells developing, mainly dry, feeling chilly but light winds.
Chance of cloud-free hill tops
40% improving to 70% later.
Maximum wind speed expected
Variable 5-10 mph
Temperature
- At 600m Plus 1 Celsius
- Valley Zero Celsius rising to plus 6 Celsius.
- Freezing level 800m
Low cloud and visibility
Broken cloud layers above 300m will thin and lift during the day, especially around eastern hills, cloud patches lingering further west. Visibility will generally be good or very good especially around eastern areas in the afternoon.
Mountain weather information
Thu 23 Jan
Sunrise:
Sunset:
Feeling cold with freezing level around 800m but rising for a time during the day, cloudy with some showers during the afternoon but strong southwesterly winds in the afternoon.
Fri 24 Jan
Sunrise:
Sunset:
Wet conditions with strong south or southwesterly winds, possibly gales, some sunny spells possible later in the day, Freezing level lifting above all summits.
Sat 25 Jan
Sunrise:
Sunset:
Southwesterly wind remaining fresh or strong but a lot of brighter weather, turning colder again with a significant windchill likely.
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.