Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for main theme, though lower confidence for extent of rainfall today and Monday. Higher confidence for warmer air into next week though lower for any rain or shower detail.
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.
Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
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.
Mountain weather forecast
Rain clearing to sunny spells and a few showers.
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
30% | 20% | 10% | 40% | 20% | 10% |
Wind direction and speed (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
N
16
|
NW
16
|
NW
16
|
W
15
|
SW
15
|
SW
16
|
| 300m |
NW
6
|
NW
9
|
NW
11
|
W
10
|
SW
10
|
SW
9
|
| Valley |
NW
5
|
NW
8
|
NW
11
|
W
12
|
SW
9
|
SW
7
|
Wind gust (mph)
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m | 20 | 21 | 22 | 21 | 22 | 24 |
| 300m | 13 | 16 | 21 | 19 | 20 | 21 |
| Valley | 11 | 16 | 21 | 22 | 20 | 19 |
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
1°
|
4°
|
6°
|
6°
|
5°
|
4°
|
| 300m |
4°
|
8°
|
9°
|
9°
|
8°
|
5°
|
| Valley |
5°
|
8°
|
10°
|
10°
|
8°
|
6°
|
| Freezing Level |
800m
|
900m
|
1,000m
|
1,000m
|
1,000m
|
1,000m
|
Altitude above mean sea level
| 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|
| 600m |
-4°
|
-1°
|
2°
|
1°
|
1°
|
-1°
|
| 300m |
2°
|
5°
|
7°
|
6°
|
5°
|
2°
|
| Valley |
3°
|
6°
|
8°
|
7°
|
6°
|
4°
|
Additional weather information
Meteorologist's view
Feeling cold for late April, especially at first this morning. Adequate layers required as well as sun protection against the moderate UV levels.
Weather
Outbreaks of rain at first across the extreme east, clearing eastwards mid-morning. Dry and brighter conditions follow with sunny spells developing and a few heavy showers. Dry and clear at first this evening, then cloud thickening from the west by midnight.
Chance of cloud-free hill tops
80% although 30% across eastern areas until mid-morning.
Low cloud and visibility
Extensive cloud above 400-500m at first in the east, then lifting clear of the summits by late morning. Poor or very poor visibility with hill fog but becoming very good with excellent air clarity across the whole of the National Park by afternoon.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 1.4mm | 1.6mm | 1.8mm |
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
Heavy showers moving in from the west overnight and through the morning, with a risk of hail. Perhaps a brief drier interlude before showers or longer spells of rain arrive from the west from late morning, mostly affecting western hills, again heavy at times with a strengthening wind. Milder temperatures will be offset by rain and winds.
Chance of cloud-free hill tops
80% quickly decreasing 40%
Maximum wind speed expected
Southerly 25-30 mph gusting 40-45 mph
Temperature
- At 600m Plus 4 rising to plus 8 Celsius.
- Valley Plus 7 rising to Plus 13 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Low cloud down to 400-500m at times throughout the morning, generally rising above summits into the afternoon though some still shrouding the highest routes. Poor visibility underneath cloud and rain, rising to good by the afternoon.
Mountain weather information
Tue 30 Apr
Sunrise:
Sunset:
Noticeably milder and probably largely dry with bright or sunny intervals, but with heavy rain never far away, just to the west. Fresh to strong southeasterly winds. Freezing levels well above the summits.
Wed 1 May
Sunrise:
Sunset:
Probably showers or longer spells of rain, often heavy and accompanied by hill fog, arriving through the morning and then persisting. Southeast winds gradually easing. Freezing levels well above the summits.
Thu 2 May
Sunrise:
Sunset:
Often cloudy with outbreaks of rain or showers. Remaining mild with light to moderate variable 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.