Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Generally high but moderate for the risk of showers on Thursday and Friday and low for the coming weekend in terms of details of rain.
This evening forecast
Showers easing then largely cloudy.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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
Variable cloud with the risk of showers.
| 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% | 20% | 20% | 20% | 60% | 60% | 60% | 20% |
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 |
SE
10
|
SE
10
|
SE
10
|
S
12
|
S
12
|
S
11
|
SW
9
|
SE
6
|
| 300m |
E
3
|
E
2
|
E
2
|
SE
5
|
S
8
|
S
8
|
SW
5
|
S
2
|
| Valley |
E
4
|
E
3
|
NE
2
|
SE
5
|
S
8
|
S
7
|
SW
5
|
SW
2
|
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 | 16 | 16 | 15 | 16 | 17 | 15 | 12 | 8 |
| 300m | 6 | 5 | 5 | 10 | 15 | 14 | 10 | 4 |
| Valley | 9 | 8 | 5 | 10 | 15 | 14 | 10 | 4 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
5°
|
5°
|
5°
|
7°
|
9°
|
9°
|
8°
|
7°
|
| 300m |
6°
|
6°
|
6°
|
10°
|
12°
|
12°
|
11°
|
8°
|
| Valley |
7°
|
7°
|
7°
|
11°
|
13°
|
13°
|
12°
|
9°
|
| Freezing Level |
1,300m
|
1,300m
|
1,300m
|
1,400m
|
1,400m
|
1,500m
|
1,500m
|
1,500m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
2°
|
1°
|
2°
|
3°
|
6°
|
7°
|
6°
|
6°
|
| 300m |
6°
|
5°
|
5°
|
9°
|
11°
|
11°
|
10°
|
8°
|
| Valley |
6°
|
6°
|
6°
|
10°
|
12°
|
12°
|
11°
|
8°
|
Additional weather information
Meteorologist's view
Feeling chilly for early May, with layers advised. UV levels will be moderate to high through the midday hours, despite the cloud cover, so skin protection is advised.
Weather
Perhaps some early morning sunshine, but tending to quickly cloud over and thereafter remaining rather often cloudy for the rest of the day. A risk of showers breaking out, especially late afternoon and into the evening, these becoming prolonged and heavy in places and confined to mainly west of the park with some parts of the National Park likely remaining dry.
Chance of cloud-free hill tops
80% but dropping to 60% in showers by the evening.
Low cloud and visibility
Periods of cloud above 700-800m may form in association with afternoon and evening showers, but peaks will probably remain cloud free for large parts of the day. Very good visibility but dropping in and around any heavy downpours briefly.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0mm | 12mm |
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
Early mist and shallow fog, then similar day to Thursday with occasional bright or sunny spells but also showers by the afternoon. These could turn heavy, possibly thundery and slow-moving though confidence low for exact positioning.
Chance of cloud-free hill tops
60% rising to 80% by mid-morning. Lowering in any heavy downpours.
Maximum wind speed expected
Southerly 10-15mph.
Temperature
- At 600m Plus 6 Celsius rising to plus 12 Celsius.
- Valley Plus 7 Celsius rising to plus 17 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Patchy cloud around 700 m gradually lifting and clearing the summits. Poor or very poor visibility in any cloud/hill fog or showers, but otherwise generally very good visibility with far reaching views of surrounding peaks.
Mountain weather information
Sat 9 May
Sunrise:
Sunset:
Largely dry with sunny spells. Risk of showers or longer spells of rain during the late afternoon and into the evening. Warm in the sun with fresh easterly winds.
Sun 10 May
Sunrise:
Sunset:
Murky with low cloud and hill fog, gradually lifting with the chance of a shower. Fresh northeasterly winds.
Mon 11 May
Sunrise:
Sunset:
Feeling cooler with sunny spells. Possible shower later.
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.