Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Only moderate confidence in rainfall detail into the day.
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.
Strong Sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.
Mountain weather forecast
Fair weather to start. Cloud increasing during the afternoon to bring some rain.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
<05% | <05% | 40% | 60% | 60% | 60% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
SE
16
|
SE
12
|
S
16
|
S
15
|
S
9
|
W
5
|
| 300m |
SE
3
|
E
4
|
SE
5
|
S
8
|
SW
3
|
W
5
|
| Valley |
NE
3
|
E
2
|
E
6
|
S
6
|
W
3
|
W
6
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 22 | 17 | 21 | 20 | 13 | 8 |
| 300m | 14 | 6 | 11 | 16 | 7 | 9 |
| Valley | 5 | 4 | 10 | 14 | 5 | 12 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
7°
|
8°
|
10°
|
10°
|
9°
|
7°
|
| 300m |
5°
|
6°
|
13°
|
13°
|
11°
|
8°
|
| Valley |
4°
|
7°
|
14°
|
14°
|
11°
|
9°
|
| Freezing Level |
1,700m
|
1,600m
|
1,800m
|
1,900m
|
1,800m
|
1,800m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
3°
|
5°
|
6°
|
7°
|
7°
|
6°
|
| 300m |
4°
|
5°
|
12°
|
12°
|
10°
|
7°
|
| Valley |
3°
|
6°
|
13°
|
13°
|
11°
|
7°
|
Additional weather information
Meteorologist's view
Nothing to add.
Weather
Dry and bright start to the day. Cloud feeding from the west from late morning to limit the sunshine and bring some outbreaks of rain into the afternoon and evening. Rain mostly light but elevated showers may possibly bring the odd moderate or heavy spell, and there is a very low chance of an isolated rumble of thunder. Winds generally light and variable through the day, with temperatures remaining mild.
Chance of cloud-free hill tops
90% initially becoming 30% into the evening in the west.
Low cloud and visibility
Cloud generally well above summits initially, thickening and lowering into the day to give areas of cloud with bases down to 400-700m in the west of the range by the evening. Visibility generally moderate to good, somewhat hazy in general and perhaps reducing to briefly poor in any heavier spells of rain. Very poor in any hill fog later in the day.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0mm | 5.8mm |
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
Patchy rain, and perhaps some summit sleet at first for western hills. Clearing to largely dry and occasionally bright conditions for the afternoon. Summit winds moderate.
Chance of cloud-free hill tops
10% becoming 80% for the afternoon
Maximum wind speed expected
N'ly 15-20 mph.
Temperature
- At 600m Plus 2 Celsius increasing 6 Celsius for the afternoon
- Valley Plus 4 Celsius increasing 10 Celsius for the afternoon
- Freezing level 800m lifting above summits from mid-morning
Low cloud and visibility
Good or very good becoming moderate or poor in rain, very poor within cloud, which will be extensive from 500m at first, before lifting and breaking during the rest of the day.
Mountain weather information
Sat 7 Mar
Sunrise:
Sunset:
Cloudy with patchy light rain. Freezing level perhaps 800m in the west of the range initially, lifting above summits by mid-morning.
Sun 8 Mar
Sunrise:
Sunset:
Largely cloudy with occasional rain, though most of this should be light. Moderate to fresh summit winds. Freezing level above summits.
Mon 9 Mar
Sunrise:
Sunset:
Scattered light showers and limited brighter spells. Light 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.