Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Generally high for main theme though lower with distribution and intensity of showers from Tuesday onwards.
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.
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.
Mountain weather forecast
Sunny spells and scattered showers, possibly heavy in the afternoon.
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
10% | 40% | 60% | 60% | 40% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
SE
19
|
SE
18
|
SE
21
|
SE
21
|
SE
19
|
SE
17
|
| 300m |
SE
8
|
SE
10
|
SE
13
|
SE
13
|
SE
12
|
SE
9
|
| Valley |
E
5
|
SE
9
|
SE
11
|
SE
12
|
SE
11
|
E
7
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m | 23 | 25 | 30 | 29 | 26 | 24 |
| 300m | 17 | 21 | 27 | 26 | 23 | 19 |
| Valley | 10 | 20 | 25 | 26 | 23 | 18 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
8°
|
9°
|
10°
|
11°
|
11°
|
10°
|
| 300m |
10°
|
12°
|
13°
|
14°
|
13°
|
12°
|
| Valley |
11°
|
12°
|
14°
|
15°
|
14°
|
12°
|
| Freezing Level |
1,600m
|
1,900m
|
1,900m
|
1,900m
|
2,000m
|
2,000m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
4°
|
5°
|
6°
|
7°
|
7°
|
6°
|
| 300m |
8°
|
10°
|
11°
|
11°
|
11°
|
10°
|
| Valley |
10°
|
11°
|
12°
|
12°
|
12°
|
11°
|
Additional weather information
Meteorologist's view
Moderate to high UV levels in any sunny breaks with sunscreen advised. Gusty winds may cause buffeting at height, especially around any heavy showers.
Weather
Some low cloud to start though lifting and breaking during the morning, leaving a day of sunny spells and showers. Showers may be heavy at times, occasionally blustery before easing into the night. Feeling warm in any sunshine.
Chance of cloud-free hill tops
70%
Low cloud and visibility
Low cloud first thing with bases around 400-500 m, gradually lifting through mid-morning. Bases may temporarily shroud tops of peaks in heavy showers as well as visibility temporarily dropping to poor. Otherwise good to very good visibility.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 34.2mm | 34.2mm | 34.2mm |
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
Often cloudy first thing, with sunnier breaks developing by mid-morning and into the afternoon. The chance of a few showers breaking out by the afternoon, perhaps locally heavy/thundery. Turning drier into the evening with some late sunshine.
Chance of cloud-free hill tops
40% at first, rising to 80%
Maximum wind speed expected
Southeasterly 15-20 mph gusting 25-30 mph.
Temperature
- At 600m Plus 07 Celsius rising to plus 13 Celsius.
- Valley Plus 12 Celsius rising to plus 17 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Patches of low cloud down to 400-600 m, rising above the highest routes by mid-morning. Generally excellent in the afternoon but a chance of deterioration in and around any showers.
Mountain weather information
Thu 16 May
Sunrise:
Sunset:
Sunshine and showers continuing through Thursday with lighter southeasterly winds.
Fri 17 May
Sunrise:
Sunset:
Further showers, possibly heavy and thundery, with sunny spells in between. Generally light winds though moderate amongst heavy showers.
Sat 18 May
Sunrise:
Sunset:
Another day of sunshine and shower, heavy and thundery at times. Generally light northeasterly 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.