Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for the generally unsettled weather, but lower for the precipitation detail for Friday.
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
Mainly dry, with rain spreading in overnight.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
20% | 20% | 30% | 30% | 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 |
S
13
|
S
15
|
S
18
|
S
16
|
S
18
|
S
21
|
| 300m |
S
8
|
S
7
|
SW
10
|
S
9
|
S
9
|
S
11
|
| Valley |
S
6
|
S
4
|
SW
8
|
SW
7
|
S
6
|
SE
7
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 17 | 19 | 23 | 21 | 24 | 29 |
| 300m | 18 | 17 | 19 | 19 | 20 | 25 |
| Valley | 17 | 14 | 18 | 17 | 17 | 19 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
3°
|
3°
|
4°
|
4°
|
4°
|
4°
|
| 300m |
4°
|
4°
|
6°
|
6°
|
6°
|
6°
|
| Valley |
4°
|
5°
|
7°
|
7°
|
6°
|
6°
|
| Freezing Level |
1,000m
|
1,000m
|
1,100m
|
1,100m
|
1,100m
|
1,100m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-2°
|
-2°
|
-1°
|
-1°
|
-1°
|
-2°
|
| 300m |
1°
|
2°
|
4°
|
4°
|
3°
|
2°
|
| Valley |
2°
|
3°
|
5°
|
5°
|
4°
|
4°
|
Additional weather information
Meteorologist's view
The stronger winds over the summits, will make it feel much colder on the tops compared to down in the valleys, especially in any showers. Note rivers and streams will still be high following recent heavy rain.
Weather
Some low cloud and hill fog possible at first, with the cloud lifting through the morning to leave mainly dry conditions with a few showers possible. There may be some sunny spells through the morning, the best of these likely in the east. A band of rain, which may fall as snow above 800m, will spread in overnight.
Chance of cloud-free hill tops
60%, best chance in east.
Low cloud and visibility
Patchy cloud and fog above 600m, lifting off the summits in the late morning or early afternoon. Outside of cloud, mostly good visibility, decreasing moderate or poor at times in any showers.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 7.2mm | 44.8mm | 50.6mm |
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
A band of heavy rain, with snow above 800m, will clear to the east by dawn. A bright and cold day will follow with showers through the morning, possibly wintry above 600m. Some could be heavy with risk of thunder, though they are likely to easy through the afternoon.
Chance of cloud-free hill tops
20% overnight, becoming 70% by morning.
Maximum wind speed expected
Westerly 20-25mph with gusts 35mph, decreasing to westerly 15-20mph with gusts 25-30mph through the morning.
Temperature
- At 600m Plus 2C.
- Valley Plus 6C falling to Plus 3C.
- Freezing level Above summits, falling to 700m through the morning.
Low cloud and visibility
Extensive cloud above 500 or 600m overnight, clearing by dawn. Mainly good visibility between showers but becoming poor or very poor at times in any showers.
Mountain weather information
Fri 5 Dec
Sunrise:
Sunset:
A dry morning, but feeling cold. Rain and strong winds spreading in from the west during the afternoon with a spell of snow above 500m. Southerly gales later with blizzards for a brief time on the high summits. Freezing level 700m, rising above summits later.
Sat 6 Dec
Sunrise:
Sunset:
Unsettled with showers or longer spells of rain. A chance of strong westerly winds. Freezing level above summits.
Sun 7 Dec
Sunrise:
Sunset:
Remaining unsettled with further rain or showers and a chance of strong 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.