Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for a largely fine, cold but breezy day Saturday and for an easterly or southeasterly airstream becoming established across the United Kingdom, but lower for cloud amounts and rainfall details from Sunday.
This evening forecast
Clear spells and a few showers this evening. Cold with Occasionally strong southwesterly winds easing
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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
Dry with sunny spells, but cloudier later. Occasionally strong southeasterly winds
| 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) |
10% | 10% | 10% | <05% | <05% | <05% | 10% | 40% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
S
15
|
S
17
|
S
18
|
SE
21
|
SE
23
|
SE
22
|
SE
23
|
SE
24
|
| 300m |
S
8
|
S
8
|
S
10
|
SE
11
|
SE
14
|
SE
13
|
SE
14
|
SE
13
|
| Valley |
S
7
|
S
7
|
SE
8
|
SE
9
|
SE
12
|
SE
11
|
SE
11
|
SE
11
|
Wind gust (mph)
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m | 20 | 23 | 26 | 29 | 31 | 32 | 34 | 35 |
| 300m | 18 | 20 | 22 | 24 | 27 | 26 | 29 | 28 |
| Valley | 18 | 19 | 21 | 22 | 26 | 25 | 26 | 25 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
4°
|
3°
|
3°
|
3°
|
4°
|
4°
|
3°
|
4°
|
| 300m |
5°
|
5°
|
5°
|
5°
|
7°
|
6°
|
6°
|
6°
|
| Valley |
6°
|
5°
|
5°
|
6°
|
8°
|
7°
|
6°
|
6°
|
| Freezing Level |
1,100m
|
1,100m
|
1,100m
|
1,100m
|
1,100m
|
1,000m
|
1,000m
|
1,200m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-1°
|
-2°
|
-2°
|
-3°
|
-2°
|
-2°
|
-3°
|
-2°
|
| 300m |
2°
|
2°
|
2°
|
2°
|
3°
|
3°
|
2°
|
2°
|
| Valley |
3°
|
3°
|
2°
|
3°
|
4°
|
4°
|
3°
|
3°
|
Additional weather information
Meteorologist's view
Feeling cold in the strong southeasterly winds, gusts around 45mph over ridges and summits.
Weather
A few showers continue through the early hours but most places dry with some long clear spells. Then a bright day with sunny spells. Cloud increases through the late afternoon and evening with outbreaks of mainly light rain edging east.
Chance of cloud-free hill tops
Around 75%. Chances fall through the evening.
Low cloud and visibility
Occasional cloud above about 600m, cloud becoming more extensive through the late afternoon and evening. Away from cloud visibility very good, perhaps falling to several kilometres in evening rain and drizzle.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 3.6mm | 38.8mm | 40.8mm |
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
Mostly cloudy overnight with outbreaks of mainly light rain. The rain clears eastwards around dawn but it continues mostly cloudy with further outbreaks of mainly light rain through the day. Risk of more persistent, occasionally heavy, rain in evening
Chance of cloud-free hill tops
Around 25% in the east.
Maximum wind speed expected
Southeasterly 15-20mph, gradually backing easterly 20mph.
Temperature
- At 600m Around plus 5 Celsius
- Valley Around plus 5 or 6 Celsius at dawn rising to plus 9 or 10 Celsius by day
- Freezing level Above the summits
Low cloud and visibility
Periods or persistent cloud above about 450-600m. Away from cloud visibility very good falling to several kilometres in rain.
Mountain weather information
Mon 22 Dec
Sunrise:
Sunset:
A cloudy day with outbreaks of rain, occasionally heavy at first. Occasionally strong easterly winds. Freezing level above summits
Tue 23 Dec
Sunrise:
Sunset:
Mostly cloudy, some brighter spells in west, with patchy rain and drizzle. Occasionally strong easterly winds. Freezing level above the summits, but falling.
Wed 24 Dec
Sunrise:
Sunset:
Continuing cloud with patchy rain, drizzle and summit snow. Occasionally strong easterly winds. Freezing level just above the 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.