Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High overall but low on regional detail for showers.
This evening forecast
Often cloudy with spells of patchy rain.
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.
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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.
Mountain weather forecast
Often cloudy but turning brighter in the afternoon. Showers possible.
| 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) |
60% | 70% | 60% | 50% | 50% | 40% | 50% | 40% |
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 |
NE
8
|
NE
6
|
NE
7
|
E
8
|
NE
8
|
NE
8
|
NE
7
|
NE
8
|
| 300m |
NE
5
|
E
4
|
NE
5
|
NE
7
|
NE
6
|
NE
6
|
NE
5
|
NE
5
|
| Valley |
NE
3
|
E
3
|
E
3
|
E
5
|
E
5
|
NE
5
|
NE
4
|
NE
3
|
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 | 10 | 10 | 11 | 12 | 11 | 12 | 11 | 13 |
| 300m | 11 | 9 | 10 | 12 | 11 | 11 | 10 | 10 |
| Valley | 9 | 7 | 8 | 9 | 10 | 9 | 9 | 8 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
8°
|
8°
|
8°
|
8°
|
10°
|
11°
|
11°
|
8°
|
| 300m |
10°
|
9°
|
9°
|
10°
|
12°
|
14°
|
13°
|
10°
|
| Valley |
10°
|
10°
|
10°
|
11°
|
13°
|
15°
|
14°
|
11°
|
| Freezing Level |
2,000m
|
2,000m
|
1,900m
|
1,900m
|
1,900m
|
1,900m
|
1,900m
|
1,900m
|
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°
|
8°
|
9°
|
9°
|
6°
|
| 300m |
9°
|
8°
|
8°
|
9°
|
11°
|
13°
|
12°
|
10°
|
| Valley |
10°
|
9°
|
9°
|
10°
|
12°
|
14°
|
14°
|
11°
|
Additional weather information
Meteorologist's view
Wet ground likely present which will make steeper slopes slippery underfoot.
Weather
Overnight low cloud and drizzle should lift and break during the morning, to leave a drier and brighter afternoon for much of the park. The small risk of a passing light shower.
Chance of cloud-free hill tops
20% during the early hours, rising to 60% during the morning and 80% for the afternoon.
Low cloud and visibility
Cloud bases of 300m during the early hours, occasionally down to 200m. Lifting to 500m through the morning, but then should be above the summits in the afternoon. Poor to very poor visibility in the hill fog, but conditions improving into the afternoon with good visibility likely.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 1mm | 1mm |
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
Similar to Monday but with fewer spells of rain. A brighter day with a mix of cloud and bright spells.
Chance of cloud-free hill tops
70%
Maximum wind speed expected
15-20 mph
Temperature
- At 600m Plus 5 Celsius, rising to plus 9 Celsius.
- Valley Plus 6 Celsius, rising to plus 15 Celsius.
- Freezing level Above summits
Low cloud and visibility
Some mist and fog in valleys possible to start. This will lift and bring some hill fog for a time before dissipating. Generally good visibility outside of low cloud.
Mountain weather information
Wed 6 May
Sunrise:
Sunset:
Bright or sunny spells and scattered showers. Feeling colder, with a moderate northerly wind.
Thu 7 May
Sunrise:
Sunset:
Bright or sunny spells and scattered showers. Winds light to moderate and more variable in direction.
Fri 8 May
Sunrise:
Sunset:
Similar to previous days. Light to moderate easterly 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.