Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Generally high confidence for a mostly unsettled period, with Sunday giving more settled spell under a passing ridge of high pressure. Low confidence for chance of showers through Saturday.
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
Overnight rain clearing to a bright, largely dry day. Increasingly cold wind chill.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
80% | 40% | 20% | 20% | 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 |
W
10
|
W
12
|
W
15
|
W
16
|
W
15
|
NW
21
|
| 300m |
W
4
|
W
7
|
W
10
|
W
10
|
W
8
|
NW
10
|
| Valley |
SW
4
|
W
7
|
W
9
|
W
9
|
W
7
|
NW
9
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 14 | 14 | 20 | 21 | 20 | 27 |
| 300m | 9 | 14 | 18 | 20 | 18 | 22 |
| Valley | 9 | 14 | 18 | 19 | 17 | 22 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
6°
|
4°
|
3°
|
2°
|
2°
|
2°
|
| 300m |
7°
|
6°
|
5°
|
4°
|
4°
|
4°
|
| Valley |
8°
|
6°
|
6°
|
5°
|
4°
|
4°
|
| Freezing Level |
1,700m
|
1,200m
|
900m
|
800m
|
900m
|
800m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
2°
|
0°
|
-2°
|
-3°
|
-4°
|
-5°
|
| 300m |
6°
|
3°
|
2°
|
1°
|
1°
|
0°
|
| Valley |
7°
|
4°
|
3°
|
2°
|
2°
|
1°
|
Additional weather information
Meteorologist's view
Previous heavy rain may result in some flooded paths and heavy rivers. There will be an increasingly significant windchill.
Weather
Outbreaks of rain at first. Becoming dry after dawn with some bright then sunny spells developing, a few light showers possible. Cloud thickens at the end of the day with some showery rain possible, but turning dry again late evening.
Chance of cloud-free hill tops
60%, best chance middle of the day.
Low cloud and visibility
Very poor visibility to start with extensive cloud to lower slopes. Cloud lifting to give patchy cloud above 500-600m for much of this morning, then above the summits by early afternoon giving very good visibility. Cloud lowering to 600m again for a few hours this evening.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 11.8mm | 17mm | 21.6mm |
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
Dry with clear spells through the early hours. Then a dry and bright morning with sunny spells. Cloud increases through the afternoon with a few light showers arriving, ahead of strengthening winds and rain spreading east through the evening.
Chance of cloud-free hill tops
90% or more during the day, falling to nil late evening.
Maximum wind speed expected
Northwest 20-25 mph, becoming southwest in the afternoon, strengthening to 30 gusting 45 mph in the evening.
Temperature
- At 600m Plus 1 Celsius increasing to 3 Celsius late evening.
- Valley Zero Celsius rising to plus 5 Celsius.
- Freezing level 600-700m, rising above the summits in the afternoon.
Low cloud and visibility
Very good or excellent visibility through the day with no cloud expected on the hills. Visibility falling to poor in the evening in rain and extensive cloud lowering to 700m, then lower slopes by midnight.
Mountain weather information
Mon 1 Dec
Sunrise:
Sunset:
A wet and windy day with strong southwest winds giving a risk of summit gales and occasionally heavy rain. Likely to turn drier with lighter winds by evening. Freezing level above the summits.
Tue 2 Dec
Sunrise:
Sunset:
A largely bright day with sunny spells and scattered showers is expected with fresh southwest summit winds. Freezing level mostly above the summits. There will be a noticeable windchill.
Wed 3 Dec
Sunrise:
Sunset:
Most likely cloudier with scattered showers on moderate southerly winds. Showers may turn heavier later in the day. Freezing level above the summits. There will be a noticeable windchill.
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.