Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for the general weather story with cold conditions giving way to very unsettled and milder weather through the weekend. Lower confidence for extent of any snow on Thursday and for the details of the change on 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
Cold and mainly cloudy. Light snow at times.
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
20% | 20% | 10% | 10% | 30% | 30% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
E
16
|
E
16
|
NE
12
|
N
10
|
NW
13
|
W
16
|
| 300m |
E
7
|
E
6
|
NE
6
|
N
4
|
W
7
|
W
8
|
| Valley |
E
5
|
E
5
|
NE
6
|
N
3
|
W
6
|
W
8
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m | 24 | 23 | 15 | 13 | 19 | 23 |
| 300m | 16 | 13 | 12 | 9 | 15 | 18 |
| Valley | 14 | 13 | 12 | 8 | 14 | 18 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
-1°
|
-2°
|
-2°
|
-2°
|
-2°
|
-2°
|
| 300m |
-1°
|
-1°
|
0°
|
1°
|
-1°
|
0°
|
| Valley |
-1°
|
-1°
|
1°
|
2°
|
0°
|
0°
|
| Freezing Level |
0m
|
0m
|
100m
|
200m
|
100m
|
200m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
-7°
|
-8°
|
-7°
|
-6°
|
-8°
|
-9°
|
| 300m |
-5°
|
-5°
|
-3°
|
-1°
|
-4°
|
-4°
|
| Valley |
-4°
|
-4°
|
-2°
|
0°
|
-3°
|
-4°
|
Additional weather information
Meteorologist's view
Very cold conditions in the hills with a severe wind chill as winds strengthen in the evening.
Weather
A mainly dry day but rather cloudy with some light snow at times during the morning. Some sunny spells developing as snow moves away. Occasional snow showers are possible around dusk, but a few clear spells also developing, perhaps allowing some icy stretches to form.
Chance of cloud-free hill tops
70%
Low cloud and visibility
Generally good or excellent visibility. Occasionally poor or very poor in snow with occasional cloud above 400m.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 3mm | 11.8mm | 29.2mm |
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 overnight but also isolated snow showers. A widespread frost with icy stretches developing. Friday will be mainly dry and bright with long sunny spells. The odd light snow shower is possible in the morning. Still feeling very cold.
Chance of cloud-free hill tops
80%.
Maximum wind speed expected
West or northwest 20 gusts 30-35mph decreasing 10-15mph.
Temperature
- At 600m Zero C rising to Plus 2C.
- Valley Minus 2C rising to Plus 3C.
- Freezing level 200-300m, rising to 700m.
Low cloud and visibility
Mainly excellent visibility, locally very poor in any snow showers with patchy cloud base 400-500m.
Mountain weather information
Sat 23 Nov
Sunrise:
Sunset:
Very unsettled with spells of heavy rain, preceded by snow briefly on the tops early morning. Persistent rain may lead to some flooding issues. Severe gale force South or Southeasterly winds. Freezing level 700m rising above summits by morning.
Sun 24 Nov
Sunrise:
Sunset:
Heavy rain clearing by morning then bright spells and occasional rain showers. Windy with southwesterly gales on the tops. Freezing level above summits.
Mon 25 Nov
Sunrise:
Sunset:
Very unsettled with showers or longer spells of rain moving in from the west. Strong to gale force westerly winds. Freezing level falling near summits later.
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.