Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Generally high confidence for Monday, although low for timings of rain. High for low cloud and strong winds Tuesday, but low for rain amounts. Generally lower confidence from Wednesday with large uncertainty in position of fronts.
This evening forecast
Heavy rain gradually clearing eastward through the evening and start of the night although low cloud likely to linger. Southerly winds 25 gusting 30 mph across the tops, perhaps easing late evening.
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.
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
Rain in the morning, heavy showers and a risk of lightning in the afternoon.
| 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) |
20% | 10% | 10% | 70% | 70% | 40% | 40% | 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 |
S
18
|
S
22
|
S
15
|
S
15
|
S
14
|
W
15
|
SW
15
|
SW
14
|
| 300m |
SW
9
|
SW
10
|
SW
7
|
S
6
|
S
8
|
W
10
|
SW
8
|
SW
9
|
| Valley |
SW
7
|
SW
6
|
SW
6
|
SE
4
|
S
7
|
W
8
|
SW
6
|
SW
7
|
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 | 25 | 30 | 21 | 21 | 19 | 21 | 21 | 20 |
| 300m | 19 | 22 | 16 | 15 | 16 | 19 | 18 | 19 |
| Valley | 18 | 18 | 16 | 11 | 16 | 18 | 15 | 17 |
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°
|
7°
|
7°
|
8°
|
6°
|
6°
|
6°
|
| 300m |
10°
|
10°
|
9°
|
9°
|
10°
|
8°
|
8°
|
7°
|
| Valley |
11°
|
10°
|
9°
|
10°
|
11°
|
9°
|
8°
|
8°
|
| Freezing Level |
1,800m
|
1,600m
|
1,500m
|
1,700m
|
1,600m
|
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 |
5°
|
3°
|
3°
|
3°
|
4°
|
2°
|
2°
|
2°
|
| 300m |
8°
|
8°
|
7°
|
8°
|
8°
|
6°
|
5°
|
5°
|
| Valley |
9°
|
9°
|
8°
|
9°
|
9°
|
7°
|
6°
|
6°
|
Additional weather information
Meteorologist's view
Some uncertainty in timing of rain and its clearance. Stronger gusts likely near heavy afternoon showers.
Weather
Some low cloud and a chance of patchy rain in the early hours, but mainly dry. Outbreaks of rain spread north in the morning, heavy for a time, before clearing to brighter spells and scattered heavy showers from around midday with a risk of lightning. Showers continue through the evening although becoming more isolated.
Chance of cloud-free hill tops
Nil in the morning, 60% in the afternoon.
Low cloud and visibility
Very poor visibility in the morning in rain and cloud, bases down to 300m. Visibility occasionally good in the afternoon as cloud bases lift to around 600m with increasing cloud breaks, but temporary reductions in visibility in passing showers.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 1.2mm | 2.8mm | 7mm |
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 and a few showers through the early hours, with outbreaks of rain arriving by dawn, quickly turning heavy with gales developing over the tops. Heavy rain is likely to ease through the morning, but drizzle, low cloud and gales persisting, with a chance of some heavier outbreaks of rain. Further persistent heavy rain in the evening.
Chance of cloud-free hill tops
Nil
Maximum wind speed expected
South 30-35 gusting 45-50 mph.
Temperature
- At 600m Plus 6 Celsius rising to 10 Celsius.
- Valley Plus 8 Celsius rising to 11 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Very poor visibility throughout the day in rain, drizzle and persistent extensive cloud, bases down to 400m, often lower slopes on southerly aspects.
Mountain weather information
Wed 12 Nov
Sunrise:
Sunset:
Further outbreaks of rain, likely to be persistent for several hours, but lighter winds. Rain is likely to clear north later in the day with a few showers remaining.
Thu 13 Nov
Sunrise:
Sunset:
A lot of uncertainty in the position of rain bands. Currently looks most likely to be largely dry with bright spells, a few showers and light winds. However a chance of persistent rain.
Fri 14 Nov
Sunrise:
Sunset:
Continuing large uncertainty around position of rain bands, although currently looking likely to be persistent rain and strong easterly winds for much of the day.
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.