Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for high pressure holding across the area. Lowering for inversion height and cloud detail.
This evening forecast
Dry with some clear spells developing mainly confined to the west. Freezing level 700m. Strong east to northeast summit winds bringing a severe wind chill.
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.
Mountain weather forecast
Mainly dry, with brighter spells best during morning. Strong summit 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) |
00% | 00% | 00% | 00% | <05% | 10% | 20% | 10% |
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
18
|
NE
19
|
NE
20
|
NE
24
|
NE
23
|
NE
22
|
NE
24
|
NE
24
|
| 300m |
NE
12
|
NE
13
|
NE
11
|
NE
14
|
NE
16
|
NE
14
|
NE
15
|
E
14
|
| Valley |
NE
10
|
E
11
|
E
9
|
E
12
|
NE
13
|
NE
13
|
E
13
|
E
13
|
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 | 24 | 25 | 26 | 32 | 31 | 29 | 33 | 34 |
| 300m | 22 | 25 | 21 | 28 | 29 | 27 | 29 | 28 |
| Valley | 21 | 23 | 20 | 28 | 27 | 26 | 28 | 27 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
0°
|
1°
|
1°
|
-1°
|
1°
|
1°
|
2°
|
2°
|
| 300m |
1°
|
1°
|
1°
|
0°
|
3°
|
4°
|
4°
|
4°
|
| Valley |
2°
|
2°
|
2°
|
1°
|
4°
|
4°
|
5°
|
5°
|
| Freezing Level |
400m
|
500m
|
500m
|
300m
|
600m
|
800m
|
1,000m
|
1,100m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-7°
|
-6°
|
-6°
|
-8°
|
-6°
|
-5°
|
-5°
|
-4°
|
| 300m |
-4°
|
-4°
|
-4°
|
-5°
|
-2°
|
-1°
|
-1°
|
0°
|
| Valley |
-3°
|
-3°
|
-2°
|
-3°
|
0°
|
0°
|
1°
|
1°
|
Additional weather information
Meteorologist's view
Freezing level figures above will be over simplistic at times as the inversion oscillates between 500m and 1000m.
Weather
Dry with clear then sunny spells overnight and during the morning. Cloud erratically feeding from the east during the afternoon to bring the chance of some patchy rain from late afternoon, but highest peaks mostly cloud free being above the inversion.
Chance of cloud-free hill tops
80% at first, becoming 30% from late afternoon.
Low cloud and visibility
Good or very good becoming moderate in rain, very low within cloud with bases becoming quite extensive between 600m and 900m from late afternoon, chiefly across the east of the park.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0mm | 0mm | 0.2mm |
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
Rather cloudy with some chance of the odd outbreak of light rain or drizzle possible, but most staying dry. Strong easterly summit winds bringing a severe wind chill.
Chance of cloud-free hill tops
40%
Maximum wind speed expected
East 30-35mph with gusts reaching 45mph at times across most exposed ridges and summits.
Temperature
- At 600m Zero to minus 2 Celsius
- Valley Plus 3 Celsius increasing 8 Celsius for the afternoon
- Freezing level 600-800m
Low cloud and visibility
Good or very good becoming moderate in any rain or drizzle, very low within cloud with bases quite extensive at 800m.
Mountain weather information
Mon 29 Dec
Sunrise:
Sunset:
Generally dry with the best of the brighter spells appearing during the morning and across the west of the Park. Moderate summit winds. Freezing level 500-700m.
Tue 30 Dec
Sunrise:
Sunset:
Generally dry with brighter spells building. Light summit winds. Freezing level 500-700m.
Wed 31 Dec
Sunrise:
Sunset:
Rather cloudy but mainly dry. Summit winds now turned west to northwest and freshening. Freezing level 500-700m.
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.