Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for cool, showery conditions with strong winds on Monday and Tuesday, then a transition to milder weather from midweek.
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
Rather cloudy with showers, briefly wintry across high summits. Strong northerly winds developing.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
80% | 40% | 10% | 10% | 20% | <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 |
W
17
|
N
20
|
N
23
|
N
25
|
N
21
|
N
18
|
| 300m |
W
9
|
N
8
|
N
12
|
N
11
|
N
6
|
N
6
|
| Valley |
W
8
|
N
6
|
N
10
|
N
9
|
NW
4
|
NW
5
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 22 | 24 | 29 | 32 | 28 | 24 |
| 300m | 20 | 18 | 23 | 24 | 18 | 18 |
| Valley | 20 | 17 | 22 | 23 | 16 | 16 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
3°
|
3°
|
3°
|
4°
|
3°
|
2°
|
| 300m |
4°
|
5°
|
5°
|
6°
|
5°
|
4°
|
| Valley |
5°
|
5°
|
6°
|
7°
|
5°
|
5°
|
| Freezing Level |
1,000m
|
1,000m
|
1,000m
|
1,000m
|
1,000m
|
900m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-3°
|
-3°
|
-3°
|
-2°
|
-3°
|
-3°
|
| 300m |
1°
|
2°
|
2°
|
3°
|
2°
|
2°
|
| Valley |
2°
|
3°
|
3°
|
4°
|
4°
|
3°
|
Additional weather information
Meteorologist's view
Conditions early morning worse in quite extensive hill fog, occasional rain and summit sleet and severe wind chill at height in strong winds.
Weather
Largely cloudy this morning with showers or a longer spell of rain, falling as sleet or snow above 800m or so. Showers lighter and isolated scattered from mid-morning, with some limited brighter spells possible through the rest of the day, but still cloudy overall. Clearer spells developing more widely this evening.
Chance of cloud-free hill tops
30% at first becoming 70% from early afternoon.
Low cloud and visibility
Extensive cloud around 400-600m in the morning, then occasionally bases 700-900m in the afternoon. Visibilities generally very good, but temporarily down to several kilometres rain or showers.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 9.6mm | 17.8mm | 17.8mm |
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
Some chance of a few early showers, wintry above 700m, on an otherwise dry day with bright spells gradually increasing. Fresh to strong winds easing later.
Chance of cloud-free hill tops
30-40% becoming 90% from late morning
Maximum wind speed expected
North mean 20mph at first with gusts reaching 30mph across most exposed ridges and summits, before gradually easing for the afternoon and evening.
Temperature
- At 600m Plus 1-3 Celsius
- Valley Plus 1 Celsius increasing 8 Celsius for the afternoon
- Freezing level Around 800-900m
Low cloud and visibility
Good becoming moderate or poor in showers, very poor in snow and within cloud with bases quite extensive at 800m at first, then lifting and breaking from mid-morning.
Mountain weather information
Wed 26 Nov
Sunrise:
Sunset:
Overcast with rain which turns heavy at times. Strong southerly summit winds developing. Freezing level soon lifting above summits.
Thu 27 Nov
Sunrise:
Sunset:
Occasional rain, heavy at times, clearing to showers during the afternoon. Fresh to strong southwest winds. Freezing level above summits.
Fri 28 Nov
Sunrise:
Sunset:
Showers or longer periods of rain, turning heavy at times. Strong southwest 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.