Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for unsettled conditions with rain spreading in from the south and west at times. Confidence in the day-to-day detail decreasing through the period so please keep updated on the forecast.
This evening forecast
Mainly dry with clear spells but some areas of mist and fog developing. Fresh southerly winds on the tops. Freezing level above summits.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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
Low cloud and outbreaks of rain. Cold and windy on the tops.
| 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) |
<05% | <05% | 30% | 60% | 70% | 90% | 90% | 90% |
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 |
SE
12
|
E
9
|
E
10
|
E
10
|
E
8
|
E
7
|
SE
9
|
SE
8
|
| 300m |
E
3
|
E
3
|
E
4
|
E
4
|
E
4
|
E
3
|
E
1
|
E
2
|
| Valley |
E
2
|
E
2
|
E
3
|
E
4
|
E
4
|
E
3
|
NE
2
|
E
2
|
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 | 16 | 14 | 15 | 14 | 11 | 9 | 12 | 11 |
| 300m | 8 | 7 | 9 | 9 | 7 | 6 | 5 | 6 |
| Valley | 6 | 7 | 8 | 9 | 8 | 6 | 5 | 5 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
3°
|
3°
|
3°
|
3°
|
4°
|
4°
|
4°
|
4°
|
| 300m |
3°
|
4°
|
4°
|
4°
|
5°
|
5°
|
5°
|
5°
|
| Valley |
4°
|
4°
|
4°
|
5°
|
6°
|
6°
|
5°
|
5°
|
| Freezing Level |
1,000m
|
1,100m
|
1,100m
|
1,300m
|
1,500m
|
1,600m
|
1,500m
|
1,600m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-2°
|
-1°
|
-1°
|
-1°
|
0°
|
1°
|
1°
|
1°
|
| 300m |
2°
|
2°
|
2°
|
2°
|
4°
|
4°
|
4°
|
4°
|
| Valley |
2°
|
3°
|
3°
|
3°
|
4°
|
5°
|
4°
|
4°
|
Additional weather information
Meteorologist's view
Difficult navigation conditions due to extensive low cloud. A cold day on the tops with a significant wind chill, especially in rain and sleet.
Weather
Mainly dry overnight with areas of low cloud on the hills. Sunday will remain cloudy and misty with outbreaks of rain, becoming heavy at times. Some sleet above 800m in the morning.
Chance of cloud-free hill tops
10%.
Low cloud and visibility
Extensive cloud with bases 300-400m, occasionally down to valley level. Away from low cloud, visibility rather hazy and often dropping to a few kilometres in rain.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 1.8mm | 2.2mm | 4.6mm |
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
Low cloud with outbreaks of rain through the day and overnight. A significant wind chill on the tops.
Chance of cloud-free hill tops
Less than 10%.
Maximum wind speed expected
Southeast 20mph gusts 30mph.
Temperature
- At 600m Plus 2C.
- Valley Plus 6 or 7C.
- Freezing level Above summits.
Low cloud and visibility
Extensive cloud and fog above 300 or 400m, down to lower slopes at first. Hazy conditions below the cloud base.
Mountain weather information
Tue 20 Jan
Sunrise:
Sunset:
Low cloud with outbreaks of rain at first then becoming drier and brighter for a period. Further rain likely to arrive in the evening. Strong southerly winds with a severe wind chill on the tops. Freezing level above summits.
Wed 21 Jan
Sunrise:
Sunset:
Outbreaks of rain, heavy at times with sleet on high summits. Severe gale force southerly winds with severe wind chill on the tops. Freezing level above summits.
Thu 22 Jan
Sunrise:
Sunset:
It is expected to remain unsettled and very windy with further periods of rain. Severe gale force southerly 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.