Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence for unsettled conditions at times during the week. Lower confidence for cloud and rain details and timings.
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.
Mountain weather forecast
Dry start, rain spreading in late morning. Fresh or strong winds.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
10% | 20% | 90% | 90% | 80% | 70% |
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
25
|
W
25
|
SW
23
|
SW
23
|
SW
22
|
SW
20
|
| 300m |
SW
13
|
W
14
|
SW
13
|
SW
13
|
SW
13
|
SW
12
|
| Valley |
SW
11
|
W
12
|
SW
11
|
SW
11
|
SW
10
|
SW
10
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 33 | 33 | 31 | 29 | 30 | 27 |
| 300m | 30 | 29 | 26 | 27 | 26 | 26 |
| Valley | 28 | 27 | 25 | 25 | 24 | 24 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
5°
|
6°
|
7°
|
7°
|
8°
|
8°
|
| 300m |
8°
|
8°
|
9°
|
9°
|
10°
|
9°
|
| Valley |
8°
|
9°
|
10°
|
10°
|
10°
|
10°
|
| Freezing Level |
1,300m
|
1,200m
|
1,600m
|
2,300m
|
2,300m
|
2,300m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-1°
|
0°
|
2°
|
3°
|
4°
|
3°
|
| 300m |
4°
|
5°
|
6°
|
6°
|
7°
|
6°
|
| Valley |
5°
|
6°
|
7°
|
7°
|
8°
|
7°
|
Additional weather information
Meteorologist's view
Note the deterioration in navigation conditions during the morning. Freezing level rising well above all summits. Low risk of gale force gusts first thing on the highest summits. Mild, but still feeling chilly in the wind.
Weather
Mostly dry and cloudy for the start of the day, a few brighter spells possible first thing. Cloud will increase from the west by mid-morning with some light rain and drizzle arriving by late morning. Rain continuing for much of the afternoon and evening with some heavier spells possible for western upslopes. Winds easing a little for the afternoon.
Chance of cloud-free hill tops
70% decreasing to 20% from late morning.
Low cloud and visibility
Areas of cloud with layers above 500m at first. Low cloud layers increasing late morning with more widespread cloud developing above 400m and lowering further during the afternoon, bases reducing to 200-300m in the southwest at times. Visibility will be occasionally good at first but turning moderate to very poor in rain and low cloud.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 5mm | 20.2mm | 33.4mm |
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
Quite cloudy for much of the day with periods of drizzle or light rain at times, especially around western slopes, perhaps some brightness around eastern hills. Cloud lifting in the afternoon with the chance of some brighter conditions or even some sunshine and clear summits, especially around more eastern hills.
Chance of cloud-free hill tops
30% improving to 80%.
Maximum wind speed expected
Southerly or southwesterly 25 mph with gusts 35-40mph.
Temperature
- At 600m Plus 7C
- Valley Plus 5C becoming 10C in the afternoon
- Freezing level Above all summits
Low cloud and visibility
Widespread cloud with bases above 300m at first turning to areas of cloud above 400-500m by dawn, then lifting above 600m for the afternoon, although a risk of lower cloud lingering in western parts. Visibility moderate to very poor at times in drizzle and low cloud at first, improving good or very good away from cloud.
Mountain weather information
Wed 25 Feb
Sunrise:
Sunset:
Cloudy with outbreaks of rain, becoming more persistent in the afternoon. Fresh southerly or southwesterly winds, feeling mild. Freezing level above summits.
Thu 26 Feb
Sunrise:
Sunset:
Strong southwesterly winds, remaining cloudy with outbreaks of rain. Freezing level above summits.
Fri 27 Feb
Sunrise:
Sunset:
Some uncertainty towards the end of the week with potential for strong winds and some rain or snow, turning colder again with freezing level lowering around 500m. Keep an eye on the latest forecast to keep up to date with the conditions for later in the week.
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.