Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Confidence high for a fine day Tuesday and the transitions to somewhat milder, windier weather Wednesday onwards. Forecast confidence becoming low by the weekend however.
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.
Mountain weather forecast
Dry with long sunny spells. Winds easing but still cold
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
<05% | <05% | <05% | <05% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
N
13
|
NW
12
|
N
15
|
N
12
|
NW
9
|
N
8
|
| 300m |
NW
4
|
NW
5
|
NW
8
|
N
5
|
NW
4
|
NW
2
|
| Valley |
W
4
|
W
5
|
NW
7
|
NW
4
|
NW
4
|
NW
3
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 18 | 18 | 19 | 15 | 13 | 12 |
| 300m | 12 | 14 | 15 | 12 | 9 | 7 |
| Valley | 11 | 14 | 15 | 11 | 10 | 7 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
2°
|
1°
|
3°
|
3°
|
1°
|
0°
|
| 300m |
3°
|
3°
|
6°
|
5°
|
2°
|
0°
|
| Valley |
3°
|
3°
|
6°
|
6°
|
2°
|
1°
|
| Freezing Level |
800m
|
700m
|
800m
|
800m
|
800m
|
700m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-4°
|
-4°
|
-2°
|
-1°
|
-3°
|
-4°
|
| 300m |
1°
|
0°
|
3°
|
4°
|
0°
|
-1°
|
| Valley |
2°
|
1°
|
4°
|
5°
|
1°
|
-1°
|
Additional weather information
Meteorologist's view
Feeling cold at height despite the sunshine and easing winds.
Weather
A chilly start with patchy cloud and the risk of a light shower, perhaps wintry over the tops, clearing into the morning to leave a dry and sunny day with slowly easing winds. Remaining dry through the evening with long clear spells and a widespread frost developing.
Chance of cloud-free hill tops
Around 80% at first, but rising close to 100% by late morning.
Low cloud and visibility
Occasional cloud above 500-600m through the early hours and first half of the morning otherwise little or no cloud expected below the summits. Outside of any early cloud visibility excellent with good panoramic views of surrounding hills and mountains.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 3.2mm | 12.8mm | 21mm |
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
Largely clear with a widespread frost and a few mist and fog patches in the valleys. Cloud above the summits tending to increase towards the end of the night. Some early bright spells at first but generally an increasingly cloudy morning with outbreaks of rain, preceded briefly by sleet or wet snow, spreading east towards midday. The rain becoming more persistent and occasionally heavy for a time in the afternoon before turning lighter and patchier again for the evening.
Chance of cloud-free hill tops
Close to 100% at first falling close to zero by early afternoon.
Maximum wind speed expected
Variable less than 10mph becoming Southerly or southwesterly 10-15mph soon after dawn then increasing 20-25mph through the morning, gusts around 40mph over ridges and summits.
Temperature
- At 600m Around zero Celsius rising steadily to plus 6 or 7 Celsius by evening
- Valley Around minus 3 or 4 Celsius at dawn rising to plus 8 or 9 Celsius through the day
- Freezing level Initially falling to 300m or less by dawn then rising above the summits by midday.
Low cloud and visibility
Little or no cloud below the summits at first becoming periods or persistent above 450-600m by early afternoon, with patches below 300m later, especially in west. Away from cloud visibility excellent falling to several kilometres in rain and sleet, and perhaps briefly a kilometre in summit snow and less in low level mist or fog patches.
Mountain weather information
Thu 27 Nov
Sunrise:
Sunset:
Mild, cloudy day with outbreaks of rain, occasionally heavy for a time later before clearing east and cloud breaking in evening. Occasionally strong southwesterly winds. Freezing level well above summits.
Fri 28 Nov
Sunrise:
Sunset:
Clear or sunny spells and showers, turning increasingly wintry on higher summits. Occasionally strong southwesterly winds. Freezing level above the summits.
Sat 29 Nov
Sunrise:
Sunset:
Rather cloudy with showers or longer spells of occasionally heavy rain. Fresh southerly or southwesterly winds possible. Freezing level 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.