Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for cold, largely dry weather initially and again later, but lower for details and timing of the brief milder, more unsettled interlude on Tuesday.
This evening forecast
Cloudy with patchy light rain and drizzle. Occasionally strong northeasterly winds.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
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.
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.
Mountain weather forecast
Cloudy start but sunny spells developing. Colder despite easing 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) |
30% | 30% | 30% | 20% | <05% | <05% | <05% | 00% |
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
16
|
NE
18
|
NE
18
|
NE
19
|
NE
16
|
NE
16
|
NE
15
|
NE
14
|
| 300m |
NE
11
|
NE
11
|
NE
12
|
NE
12
|
NE
11
|
NE
10
|
NE
8
|
NE
6
|
| Valley |
NE
9
|
NE
10
|
NE
10
|
NE
10
|
NE
10
|
NE
9
|
NE
7
|
NE
5
|
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 | 22 | 24 | 25 | 26 | 22 | 23 | 22 | 21 |
| 300m | 20 | 21 | 22 | 22 | 20 | 19 | 18 | 15 |
| Valley | 19 | 20 | 21 | 22 | 21 | 18 | 18 | 12 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
6°
|
6°
|
5°
|
5°
|
4°
|
4°
|
2°
|
2°
|
| 300m |
8°
|
7°
|
7°
|
7°
|
7°
|
7°
|
5°
|
4°
|
| Valley |
8°
|
8°
|
8°
|
7°
|
8°
|
8°
|
5°
|
4°
|
| Freezing Level |
2,000m
|
2,000m
|
2,000m
|
1,800m
|
1,200m
|
1,000m
|
800m
|
700m
|
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°
|
1°
|
0°
|
-1°
|
-1°
|
-3°
|
-3°
|
| 300m |
5°
|
4°
|
4°
|
3°
|
4°
|
4°
|
2°
|
1°
|
| Valley |
6°
|
5°
|
5°
|
4°
|
5°
|
5°
|
3°
|
2°
|
Additional weather information
Meteorologist's view
Remaining very wet underfoot after recent heavy rain. Turning colder through the day.
Weather
Cloudy through the early hours with further patchy light rain and drizzle. Becoming mainly dry through the morning with some good sunny spells developing for the afternoon. Dry this evening and skies clearing.
Chance of cloud-free hill tops
Little chance at first becoming 75% by late morning and close to 100% for the afternoon.
Low cloud and visibility
Periods or persistent above 450-600m at first becoming more occasional above 600-750m by late morning with little or no cloud below the summits in the afternoon. Away from cloud visibility several kilometres in rain and drizzle through the early hours, otherwise very good or excellent with good panoramic views of surrounding hills and mountains developing.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 14.8mm | 29.8mm | 39.2mm |
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
Dry and largely clear or sunny, but still cold despite winds becoming light.
Chance of cloud-free hill tops
Close to 100%.
Maximum wind speed expected
Northerly 15mph becoming 10mph or less by early afternoon.
Temperature
- At 600m Around plus 1 Celsius
- Valley Minus 1 or 2 Celsius rising to plus 7 or 8 Celsius by day.
- Freezing level Around 750m
Low cloud and visibility
Little or no cloud expected below the summits. Visibility, very good or excellent.
Mountain weather information
Tue 18 Nov
Sunrise:
Sunset:
Bright start but becoming cloudy with outbreaks of rain and, initially, summit snow for the afternoon. Freshening westerly winds. Freezing level rising above the summits.
Wed 19 Nov
Sunrise:
Sunset:
A few early wintry showers possible, but generally dry with long sunny or clear spells. Occasionally strong, cold northerly winds developing. Freezing level falling to 450m.
Thu 20 Nov
Sunrise:
Sunset:
Dry and clear or sunny. Very cold despite winds easing. Freezing level lowering to 300m or less.
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.