Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for transitioning to a milder westerly pattern from Sunday, but lowering for the timing detail of later poorer weather.
This evening forecast
Cloudy with showers, wintry above 600m, frequent and heavy early evening, dwindling late evening as clear spells develop. Strong northwest summit winds, with associated severe wind chill effect. Freezing level around 800m.
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, bright and cold start. Rain developing for afternoon. Strong summit winds developing.
| 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) |
20% | 20% | 30% | 30% | 70% | 90% | 90% | 50% |
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
20
|
NW
16
|
NW
16
|
W
19
|
W
22
|
W
23
|
W
28
|
W
26
|
| 300m |
NW
9
|
W
7
|
W
9
|
W
11
|
W
13
|
W
14
|
W
17
|
W
16
|
| Valley |
NW
8
|
W
7
|
W
8
|
W
10
|
W
12
|
W
13
|
W
15
|
W
14
|
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 | 27 | 23 | 22 | 25 | 29 | 32 | 38 | 37 |
| 300m | 22 | 17 | 19 | 22 | 25 | 29 | 35 | 33 |
| Valley | 23 | 17 | 20 | 22 | 25 | 28 | 32 | 30 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
2°
|
2°
|
2°
|
3°
|
5°
|
5°
|
7°
|
8°
|
| 300m |
4°
|
3°
|
4°
|
6°
|
8°
|
7°
|
9°
|
10°
|
| Valley |
4°
|
4°
|
5°
|
6°
|
8°
|
8°
|
9°
|
10°
|
| Freezing Level |
800m
|
800m
|
900m
|
1,000m
|
1,100m
|
1,600m
|
2,000m
|
1,800m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-4°
|
-4°
|
-3°
|
-2°
|
-1°
|
0°
|
2°
|
3°
|
| 300m |
0°
|
0°
|
1°
|
2°
|
4°
|
4°
|
5°
|
6°
|
| Valley |
1°
|
1°
|
2°
|
3°
|
5°
|
5°
|
6°
|
7°
|
Additional weather information
Meteorologist's view
Poor conditions for the late afternoon as hill fog develops. Severe wind chill receding as freezing levels lift.
Weather
Cold with a few scattered light showers at first, snow level 600-700m. Best of brighter spells expected across the east during the early morning. Cloud increasing by late morning heralding an area of rain that reaches from the west for the afternoon, before clearing to showers during the evening.
Chance of cloud-free hill tops
80% becoming 30% for the late afternoon
Low cloud and visibility
Good or very good becoming moderate or poor in rain or showers, very poor in snow and within cloud, with bases becoming extensive from 500-600m for the late afternoon.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 4mm | 20.6mm | 23mm |
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
Isolated showers and brighter spells for the bulk of the day. Area of light to moderate rain reaching from the west towards early evening. Strong summit winds, with associated severe wind chill at height. Freezing level above summits.
Chance of cloud-free hill tops
80% becoming 40% from late afternoon
Maximum wind speed expected
West or northwest mean 20-30mph with gusts reaching 40mph across most exposed ridges and summits.
Temperature
- At 600m Plus 7 Celsius
- Valley Plus 6 Celsius increasing 13 Celsius during the afternoon
- Freezing level Above summits
Low cloud and visibility
Good or very good becoming moderate or poor in rain or showers, very poor within cloud, with bases occasionally lowering to 600m at first becoming quite extensive late afternoon.
Mountain weather information
Tue 28 Oct
Sunrise:
Sunset:
Brighter spells and only a few scattered light showers about. Strong summit winds. Freezing level above summits.
Wed 29 Oct
Sunrise:
Sunset:
Rather cloudy with occasional rain. Strong summit winds. Freezing level above summits.
Thu 30 Oct
Sunrise:
Sunset:
Rather cloudy with showers or longer periods of rain. Strong, perhaps gale force, summit winds developing. 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.