Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for the mobile nature of the westerly weather pattern, but lowering for the transitional timing detail.
This evening forecast
Showers decreasing, clear spells. Moderate winds. Freezing level 500-600m
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
Showers, most frequent late morning. Strong winds.
| 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) |
10% | 10% | 20% | 90% | 40% | 30% | 20% | 20% |
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 |
NW
14
|
W
16
|
W
18
|
NW
22
|
NW
24
|
NW
23
|
NW
18
|
NW
14
|
| 300m |
W
7
|
W
8
|
W
10
|
W
15
|
NW
16
|
NW
17
|
NW
10
|
W
7
|
| Valley |
W
7
|
W
7
|
W
8
|
W
14
|
NW
15
|
NW
15
|
NW
9
|
W
6
|
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 | 21 | 24 | 25 | 31 | 34 | 33 | 25 | 21 |
| 300m | 17 | 19 | 21 | 29 | 30 | 32 | 20 | 15 |
| Valley | 17 | 18 | 19 | 28 | 30 | 30 | 19 | 15 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
1°
|
0°
|
0°
|
1°
|
2°
|
3°
|
2°
|
1°
|
| 300m |
3°
|
2°
|
2°
|
4°
|
6°
|
6°
|
5°
|
3°
|
| Valley |
4°
|
3°
|
3°
|
5°
|
7°
|
7°
|
6°
|
3°
|
| Freezing Level |
600m
|
400m
|
500m
|
500m
|
600m
|
600m
|
600m
|
600m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-4°
|
-5°
|
-7°
|
-5°
|
-4°
|
-3°
|
-4°
|
-4°
|
| 300m |
0°
|
-1°
|
-2°
|
0°
|
1°
|
2°
|
1°
|
0°
|
| Valley |
1°
|
0°
|
0°
|
1°
|
3°
|
3°
|
3°
|
1°
|
Additional weather information
Meteorologist's view
Conditions improving for the afternoon, but severe wind chill continuing across highest peaks.
Weather
Showers of snow, sleet and rain, most frequent mid to late morning, heavy at times through late morning and early afternoon. Outbreaks lighter and less frequent from mid-afternoon.
Chance of cloud-free hill tops
60% becoming 20% mid to late morning, then 70% from mid-afternoon
Low cloud and visibility
Good becoming moderate or poor in rain, very poor in snow and within cloud with bases becoming quite extensive from 500m by mid-morning, before lifting and breaking during the afternoon.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 4.6mm | 8.8mm | 19.2mm |
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
Rain reaching from the north from late morning, with snow initially across highest routes. Rain occasionally turning heavy into the afternoon, before clearing to showers early evening. Strong to gale summit winds.
Chance of cloud-free hill tops
50% at dawn becoming 20% late morning, then 70% by early evening
Maximum wind speed expected
West or southwest increasing by mid-day to mean 45mph with gusts reaching 60mph across more exposed ridges and summits.
Temperature
- At 600m Plus 1 Celsius increasing 4 Celsius for the afternoon
- Valley Plus 1 Celsius increasing 12 Celsius for the afternoon
- Freezing level Above summits
Low cloud and visibility
Good or very good becoming moderate or poor in rain, very poor in snow and within cloud with bases becoming extensive from 500m from late morning, before lifting and breaking later in the day.
Mountain weather information
Mon 30 Mar
Sunrise:
Sunset:
Mainly dry with brighter spells. Strong to gale winds. Freezing level above summits.
Tue 31 Mar
Sunrise:
Sunset:
Beginning cloudy with patchy light rain, then turning largely dry and occasionally bright for the afternoon. Fresh winds. Freezing level above the summits.
Wed 1 Apr
Sunrise:
Sunset:
Cloudy with occasional light rain. Fresh winds. Freezing level above the 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.