Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence that high pressure will give a lot of fine weather next few days. Moderate confidence regarding low cloud and fog details later tonight and tomorrow morning, and regarding the strength of the wind mid week. High confidence that the weather will become more changeable from Friday, but lower confidence at this stage regarding rainfall details.
This evening forecast
A very small chance of a shower developing during this evening across eastern parts of the National Park. Otherwise dry with hazy sunshine, then clear spells after dusk. A fresh north to northeasterly breeze blowing on the mountain tops.
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.
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
A cloudy start with some fog and patchy light rain or drizzle. Becoming sunny then clear later.
| 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) |
00% | 00% | 40% | 20% | 10% | <05% | 00% | 00% |
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 |
NE
13
|
NE
19
|
NE
21
|
NE
20
|
NE
20
|
NE
18
|
NE
17
|
NE
18
|
| 300m |
NE
4
|
NE
9
|
NE
11
|
NE
13
|
NE
13
|
NE
12
|
NE
11
|
NE
9
|
| Valley |
E
3
|
NE
8
|
NE
9
|
NE
11
|
NE
12
|
NE
12
|
NE
9
|
E
8
|
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 | 20 | 24 | 27 | 26 | 27 | 25 | 24 | 27 |
| 300m | 14 | 18 | 22 | 24 | 25 | 24 | 22 | 22 |
| Valley | 11 | 18 | 19 | 22 | 23 | 24 | 20 | 20 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
7°
|
5°
|
5°
|
6°
|
6°
|
7°
|
8°
|
6°
|
| 300m |
8°
|
8°
|
8°
|
8°
|
9°
|
10°
|
11°
|
8°
|
| Valley |
8°
|
9°
|
8°
|
9°
|
10°
|
12°
|
12°
|
9°
|
| Freezing Level |
1,600m
|
1,500m
|
1,500m
|
1,400m
|
1,400m
|
1,400m
|
1,500m
|
1,200m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
3°
|
0°
|
0°
|
1°
|
1°
|
3°
|
5°
|
2°
|
| 300m |
6°
|
6°
|
4°
|
5°
|
6°
|
8°
|
9°
|
6°
|
| Valley |
7°
|
7°
|
6°
|
6°
|
8°
|
9°
|
10°
|
7°
|
Additional weather information
Meteorologist's view
Early fog patches are likely to give poor conditions for navigating. Given the time of year when the sun breaks through for the afternoon, it will become quite strong, so sun cream is advised. There will be a cold wind on the hill tops, especially later, so warm clothing is advised.
Weather
Cloud arriving from the east tonight, lowering onto the hills to give some fog patches and a chance of patchy light rain or drizzle towards dawn, and for a time on Tuesday morning. Fog slowly clearing tomorrow morning, with cloud lifting to give some sunny intervals during the afternoon. Becoming sunny then clear in the evening. Strengthening east to northeasterly winds.
Chance of cloud-free hill tops
20% at first, rising to 70% or more by midday, then 100% under sunny/clear skies in the evening.
Low cloud and visibility
Cloud likely to obscure hills above about 400 or 500m at first, perhaps locally down to around 300m in any drizzly rain. Cloud lifting above the hill tops by late morning, then skies clearing during the evening. Visibility poor in early fog and drizzly rain, becoming good or very good from late morning, with distant hills visible later in the day.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0mm | 0mm |
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
Dry with mostly clear or sunny weather. A small chance of the odd mist patch at first, with a slight frost on the summits for a time overnight. Some high cloud possible during the evening. Fresh to strong easterly winds, with gales possible at times on the summits, especially later.
Chance of cloud-free hill tops
80% or more throughout the day.
Maximum wind speed expected
East to northeasterly, 30 to 35mph, occasionally perhaps 40mph, with gusts 40 to 45mph, perhaps 50mph at times later.
Temperature
- At 600m PS02C rising to PS13C.
- Valley PS05C rising to PS19C.
- Freezing level Near the summits for a while during the early hours, otherwise above throughout.
Low cloud and visibility
Isolated mist patches at first could give locally moderate visibility, otherwise clear skies with good or very good visibility.
Mountain weather information
Thu 30 Apr
Sunrise:
Sunset:
Dry with plenty of sunshine. Cloud increasing late afternoon into the evening with a chance of showers later. Brisk and gusty easterly winds easing slowly and turning southeasterly. Very good visibility until any showers arrive later. Freezing levels above the summits throughout.
Fri 1 May
Sunrise:
Sunset:
Mostly cloudy with showers at times. Winds lighter than recently. Visibility moderate perhaps poor in any heavy showers. Freezing levels above the summits throughout.
Sat 2 May
Sunrise:
Sunset:
Remaining rather cloudy with some mostly light showers. Breezy on the summits. Freezing levels above the summits throughout.
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.