Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for a mostly dry couple of days to come with mainly sunny and warm conditions. Moderate in terms of the details of showers and thunderstorms from Tuesday onwards.
This evening forecast
A chance of heavy showers and thunderstorms this evening then dry and clear overnight.
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
Generally dry with lots of strong sunshine and feeling warm.
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 600m) |
10% | <05% | <05% | <05% | <05% | <05% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
NE
11
|
NE
11
|
NE
12
|
NE
13
|
NE
13
|
NE
10
|
NE
9
|
E
11
|
| 300m |
NE
4
|
NE
4
|
NE
3
|
NE
7
|
NE
10
|
NE
7
|
NE
5
|
E
4
|
| Valley |
NE
3
|
NE
2
|
NE
2
|
NE
6
|
NE
9
|
NE
7
|
NE
5
|
E
3
|
Wind gust (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m | 15 | 15 | 16 | 18 | 19 | 15 | 13 | 16 |
| 300m | 11 | 9 | 9 | 12 | 18 | 14 | 13 | 9 |
| Valley | 10 | 7 | 7 | 11 | 17 | 15 | 13 | 8 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
11°
|
9°
|
9°
|
11°
|
15°
|
17°
|
16°
|
13°
|
| 300m |
12°
|
9°
|
10°
|
15°
|
19°
|
20°
|
18°
|
12°
|
| Valley |
12°
|
8°
|
10°
|
15°
|
20°
|
21°
|
19°
|
13°
|
| Freezing Level |
2,300m
|
1,800m
|
1,700m
|
1,900m
|
2,000m
|
2,200m
|
2,200m
|
2,100m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
9°
|
7°
|
6°
|
9°
|
13°
|
14°
|
14°
|
11°
|
| 300m |
12°
|
8°
|
9°
|
13°
|
16°
|
18°
|
17°
|
12°
|
| Valley |
12°
|
8°
|
10°
|
15°
|
17°
|
19°
|
18°
|
12°
|
Additional weather information
Meteorologist's view
Very high UV levels through the middle of the day so remember to protect your skin from the harmful UV rays and stay hydrated.
Weather
Any mist or valley fog soon clearing after dawn to leave plentiful amounts of sunshine. Some fair weather cloud bubbling up with a very slim chance of a localised heavy shower, though most likely staying entirely dry. A fine and warm evening to come.
Chance of cloud-free hill tops
>95%.
Low cloud and visibility
Patchy mist and fog soon clearing then any cloud above summits. Locally poor visibility first thing but otherwise very good.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 5mm | 5mm |
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
The chance of more widespread low cloud developing during the early hours. This soon clearing after dawn to leave another mainly dry day with sunny spells. An outside chance of a shower during the afternoon. Feeling warm in the strong sunshine with very high UV levels during the middle of the day.
Chance of cloud-free hill tops
70% becoming 100% by mid-morning.
Maximum wind speed expected
North-easterly 10-15 mph.
Temperature
- At 600m Plus 7 Celsius rising to plus 16 Celsius.
- Valley Plus 7 Celsius rising to plus 21 Celsius.
- Freezing level Well above the summits.
Low cloud and visibility
Patches of cloud around 300-400m at first, soon lifting and clearing by mid-morning. Thereafter all cloud above summits. Locally poor visibility in cloud at first, otherwise good views of distant hills and landmarks.
Mountain weather information
Tue 21 May
Sunrise:
Sunset:
A higher risk of showers on Tuesday with possible thunderstorms. However warm spells of sunshine are also expected and winds remaining light from variable directions.
Wed 22 May
Sunrise:
Sunset:
Broken cloud and occasional sunny intervals with a scattering of showers, these locally heavy. Light to moderate northwesterly winds
Thu 23 May
Sunrise:
Sunset:
Similar to Wednesday with bright or sunny spells, a chance of a few showers and light to moderate north-westerly winds. Feeling a bit cooler.
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.