Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Medium
This evening forecast
Heavy rain soon clearing to scattere3d showers. Summit gales, but winds also decreasing and turning into southwest.
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.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
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.
Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
Mountain weather forecast
Cloudy or bright with showers. Windy.
| 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) |
50% | 30% | 20% | 30% | 60% | 60% | 20% | 30% |
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 |
SW
36
|
SW
32
|
SW
29
|
SW
24
|
SW
27
|
SW
25
|
SW
23
|
SW
20
|
| 300m |
SW
19
|
SW
18
|
SW
16
|
SW
13
|
SW
14
|
SW
14
|
SW
12
|
SW
11
|
| Valley |
SW
15
|
SW
15
|
SW
13
|
SW
11
|
SW
12
|
SW
12
|
SW
10
|
SW
9
|
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 | 46 | 42 | 39 | 33 | 36 | 33 | 31 | 28 |
| 300m | 39 | 38 | 33 | 28 | 30 | 30 | 27 | 24 |
| Valley | 37 | 35 | 30 | 25 | 28 | 28 | 25 | 23 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
6°
|
6°
|
6°
|
6°
|
6°
|
6°
|
6°
|
6°
|
| 300m |
8°
|
8°
|
8°
|
8°
|
8°
|
8°
|
8°
|
7°
|
| Valley |
9°
|
9°
|
8°
|
8°
|
9°
|
9°
|
8°
|
8°
|
| Freezing Level |
1,400m
|
1,400m
|
1,400m
|
1,400m
|
1,500m
|
1,500m
|
1,400m
|
1,400m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
0°
|
0°
|
0°
|
0°
|
1°
|
1°
|
0°
|
1°
|
| 300m |
4°
|
4°
|
4°
|
4°
|
5°
|
4°
|
4°
|
4°
|
| Valley |
6°
|
5°
|
5°
|
6°
|
6°
|
6°
|
5°
|
5°
|
Additional weather information
Meteorologist's view
Nothing further to add.
Weather
Cloudy or bright with occasional showers, the showers perhaps merging in a longer spell of rain for a time in the afternoon which could be heavy. Windy at height with a significant wind chill.
Chance of cloud-free hill tops
70% falling 40% for a time in the afternoon.
Low cloud and visibility
Broken or extensive cloud, base 600 to 900m, occasionally 300 to 600m in the afternoon. Visibility good or very good falling moderate to very poor in cloud and rain.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 2.2mm | 3.6mm | 12.6mm |
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
Mostly cloudy with showers or the odd longer spell of rain, heavy at times and perhaps wintry over the highest summits towards evening. Becoming dry with the cloud lifting and breaking during the evening with clear spells developing, a touch of frost possible by midnight.
Chance of cloud-free hill tops
30% becoming 80% in the evening.
Maximum wind speed expected
Southwest 20 to 25mph with a significant wind chill.
Temperature
- At 600m Plus 3 Celsius falling Zero Celsius later
- Valley Plus 4 to 7 Celsius, falling 2 Celsius in the evening.
- Freezing level Above the summits falling 600m or less later
Low cloud and visibility
Occasional or extensive low cloud, base 300 to 600m, lifting and breaking near or above the summit through the evening. Visibility often moderate to very poor at height, becoming mostly very good later.
Mountain weather information
Wed 14 Jan
Sunrise:
Sunset:
Mainly dry and bright with a frost possible at first. Outbreaks of rain and summit snow in the evening. Strengthening southerly winds later. Freezing most or all levels at first, gradually rising towards the summits.
Thu 15 Jan
Sunrise:
Sunset:
Outbreaks of rain soon clearing to wintry showers. Freezing level typically around the summits, but 400 to 600m late in the period. Winds moderate to fresh from the southwest.
Fri 16 Jan
Sunrise:
Sunset:
A dry and bright or clear start. Wintry showers developing during the day. Freezing level below the summits. Light or moderate southeast becoming northeast winds.
Updated at:
Summit specific forecast
Mountain summit forecast map
Loading map…
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.