Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for dry weather during daytime on Wednesday then rain, sleet or summit snow later. Low confidence from Thursday for the development of low pressure areas and precipitation.
This evening forecast
Dry with long clear spells and a frost. Light northwest winds.
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
Dry and bright day but cold on the tops. Rain and summit snow in evening.
| 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) |
00% | 00% | 00% | 00% | 00% | 00% | 30% | 70% |
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 |
N
7
|
NW
6
|
W
6
|
S
9
|
S
14
|
S
17
|
S
20
|
S
23
|
| 300m |
W
2
|
W
4
|
SW
4
|
S
5
|
S
4
|
S
5
|
S
6
|
S
13
|
| Valley |
W
3
|
W
4
|
NW
3
|
NE
1
|
E
2
|
SE
3
|
SE
3
|
S
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 | 11 | 10 | 7 | 11 | 19 | 23 | 26 | 30 |
| 300m | 6 | 7 | 6 | 9 | 11 | 14 | 18 | 27 |
| Valley | 5 | 6 | 5 | 4 | 4 | 10 | 9 | 26 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
1°
|
0°
|
0°
|
0°
|
1°
|
1°
|
1°
|
2°
|
| 300m |
0°
|
0°
|
0°
|
0°
|
3°
|
3°
|
2°
|
4°
|
| Valley |
1°
|
0°
|
-1°
|
-1°
|
3°
|
4°
|
3°
|
4°
|
| Freezing Level |
600m
|
500m
|
400m
|
300m
|
500m
|
600m
|
800m
|
1,000m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-2°
|
-3°
|
-3°
|
-4°
|
-5°
|
-4°
|
-5°
|
-5°
|
| 300m |
-1°
|
-2°
|
-2°
|
-2°
|
1°
|
1°
|
0°
|
-1°
|
| Valley |
-1°
|
-2°
|
-3°
|
-2°
|
2°
|
2°
|
1°
|
1°
|
Additional weather information
Meteorologist's view
A dry and bright day but feeling cold on the tops. Rain, sleet and summit snow in the evening with strong winds bringing a severe wind chill.
Weather
Dry with mainly clear skies and a frost overnight. A dry day with long sunny spells in the morning then some high cloud in the afternoon. Outbreaks of rain, with snow for a time above 600m, will spread east during the evening.
Chance of cloud-free hill tops
100% becoming 10% during the evening as cloud lowers.
Low cloud and visibility
Good visibility through the day but a chance of some fog patches in the valleys at first. Deteriorating quickly after dark with cloud becoming extensive above 300 or 400m.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 3.4mm | 21.2mm | 23.4mm |
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
Rain will clear east overnight. A dry and bright start to Thursday then persistent rain, sleet and summit snow is expected to spread north, becoming heavy at times.
Chance of cloud-free hill tops
20%, becoming 70% for a time in the morning.
Maximum wind speed expected
South or SW 25mph gusts 35mph, perhaps gusts 50mph for a time.
Temperature
- At 600m Plus 2 or 3C.
- Valley Plus 6 or 7C.
- Freezing level Above summits, falling to 800m.
Low cloud and visibility
Rather extensive cloud above 400 or 500m overnight, lifting and breaking for a time in the morning then becoming extensive again in afternoon. Poor visibility setting in when rain, sleet or snow arrive.
Mountain weather information
Fri 16 Jan
Sunrise:
Sunset:
Rain, sleet or snow clearing overnight. A rather cold day with sunny spells and showers, falling as snow above 600m. A chance of hail and thunder. Winds expected to be mainly light. Freezing level 800m.
Sat 17 Jan
Sunrise:
Sunset:
Bright spells and scattered showers, wintry on the tops. Light southerly winds. Freezing level just above summits.
Sun 18 Jan
Sunrise:
Sunset:
A lot of dry weather with bright spells and a few showers, wintry on the tops. Light southerly winds becoming strong.
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.