Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Moderate to high confidence in largely dry conditions on Friday. Low confidence in the details over the weekend, particularly regarding the timings and intensities of any rainfall in the east.
This evening forecast
Dry with clear spells. Turning chilly.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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
Often cloudy but dry with rain arriving later.
| 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% | 10% | 10% | <05% | <05% | 20% | 60% |
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
9
|
NE
8
|
NE
9
|
NE
11
|
E
10
|
E
9
|
E
10
|
NE
11
|
| 300m |
NE
5
|
NE
5
|
NE
6
|
NE
9
|
E
8
|
E
7
|
NE
7
|
NE
7
|
| Valley |
NE
4
|
E
4
|
E
6
|
E
9
|
E
7
|
E
7
|
NE
7
|
NE
7
|
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 | 12 | 11 | 15 | 16 | 14 | 13 | 14 | 17 |
| 300m | 10 | 10 | 12 | 16 | 13 | 13 | 13 | 16 |
| Valley | 9 | 10 | 12 | 16 | 14 | 13 | 15 | 16 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
2°
|
1°
|
1°
|
2°
|
4°
|
5°
|
5°
|
3°
|
| 300m |
4°
|
3°
|
3°
|
5°
|
8°
|
8°
|
7°
|
5°
|
| Valley |
5°
|
4°
|
4°
|
6°
|
8°
|
9°
|
8°
|
6°
|
| Freezing Level |
900m
|
700m
|
600m
|
600m
|
800m
|
900m
|
900m
|
900m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
-2°
|
-2°
|
-3°
|
-2°
|
1°
|
2°
|
2°
|
-1°
|
| 300m |
2°
|
1°
|
0°
|
2°
|
5°
|
6°
|
5°
|
2°
|
| Valley |
3°
|
2°
|
1°
|
3°
|
6°
|
7°
|
6°
|
3°
|
Additional weather information
Meteorologist's view
Extra layers recommended at elevation due to feeling sub-zero on the summits early and late.
Weather
Mainly dry during the early hours with clear spells allowing the chance of a frost in valleys as well as a few isolated fog patches. Mainly dry during the morning with broken cloud and sunny intervals. Staying similar through the afternoon with cloudy skies mixed with bright periods ahead of showery rain perhaps edging in by late in the night.
Chance of cloud-free hill tops
80%
Low cloud and visibility
Scraps of cloud are possible between 400m and 600m first thing but otherwise very good visibility is expected in general. Locally very poor in any early morning fog patches.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0.8mm | 1.2mm |
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
Lower confidence relative to the period. Often overcast with showery rain through the early hours, heavy at times, falling as sleet over the highest routes, and slowly pushing northwards and breaking up throughout the day. Turning drier into the evening with the odd shower, and clearer spells developing. Feeling cold, especially at height under the cloud.
Chance of cloud-free hill tops
30%
Maximum wind speed expected
East to northeasterly winds 15-20 mph gusting 25-30 mph
Temperature
- At 600m Zero rising to Plus 3 Celsius.
- Valley Plus 5 Celsius rising to Plus 9 Celsius.
- Freezing level 800 m rising above summits by midday.
Low cloud and visibility
Patches of lower cloud around 600 m, with best of any breaks further west of the park in the afternoon. Poor visibilities under low cloud and rain, rising to good later in the day.
Mountain weather information
Sun 28 Apr
Sunrise:
Sunset:
Lower confidence in detail with rain possible overnight in the east clearing by the morning. Otherwise, drier and brighter with the odd shower. Freezing level above summits.
Mon 29 Apr
Sunrise:
Sunset:
Mostly dry with largely cloudy skies, bright or sunny intervals and the chance of isolated light showers. Feeling a bit warmer with moderate south-westerly winds. Freezing levels above the summits.
Tue 30 Apr
Sunrise:
Sunset:
Early fog patches then turning cloudier through the day with outbreaks of rain approaching from the west. Light to moderate southeasterly winds. Freezing level above summits.
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.