Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Confidence is moderate on Wednesday for detail of precipitation and cloud. High confidence for cold conditions to persist until Friday when a milder southwesterly airstream is expected to dominate towards the weekend.
This evening forecast
Cloud thickening during the evening but remaining dry, with strengthening southeasterly winds, feeling very cold on the hills.
Mountain weather hazards
Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.
Severe Chill Effect
Poor Visibility
Blizzards
Gales
Mountain weather forecast
Cloudy with outbreaks of snow and sleet turning heavier later in the day, strong southeasterly 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% | 50% | 70% | 80% | 60% | 90% | 90% | 70% |
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
SE
25
|
SE
27
|
SE
27
|
SE
26
|
SE
23
|
E
20
|
E
17
|
E
14
|
| 300m |
E
10
|
E
10
|
E
10
|
E
11
|
E
12
|
E
12
|
E
9
|
NE
9
|
| Valley |
E
10
|
E
10
|
E
10
|
E
10
|
E
11
|
E
11
|
E
9
|
NE
8
|
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m | 36 | 39 | 38 | 37 | 32 | 29 | 27 | 24 |
| 300m | 21 | 21 | 23 | 24 | 23 | 25 | 19 | 18 |
| Valley | 23 | 23 | 23 | 25 | 24 | 22 | 19 | 18 |
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-1°
|
-2°
|
-2°
|
-1°
|
-1°
|
-1°
|
-1°
|
-2°
|
| 300m |
1°
|
0°
|
0°
|
0°
|
1°
|
1°
|
1°
|
0°
|
| Valley |
2°
|
1°
|
1°
|
1°
|
2°
|
2°
|
1°
|
1°
|
| Freezing Level |
200m
|
200m
|
200m
|
300m
|
400m
|
400m
|
300m
|
300m
|
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-9°
|
-10°
|
-10°
|
-9°
|
-8°
|
-8°
|
-8°
|
-8°
|
| 300m |
-3°
|
-4°
|
-5°
|
-4°
|
-3°
|
-4°
|
-4°
|
-4°
|
| Valley |
-2°
|
-3°
|
-4°
|
-3°
|
-2°
|
-2°
|
-2°
|
-3°
|
Additional weather information
Meteorologist's view
Risk of gale force gusts on the summits buffeting at times and will enhance the windchill effect, combined with snowfall, blizzard conditions are a risk on the higher mountains with some reasonable snow accumulations expected.
Weather
A cloudy start with outbreaks of sleet and snow above 200m, rain at lower levels. Low cloud is likely to become a hazard as it fills in during the morning. The snow and sleet will mostly be light and intermittent but turning heavier at times. With strong winds and a small risk of summit gales some blizzard conditions on the higher summits can be expected at times with accumulations expected, full winter gear is likely to be required on the hills.
Chance of cloud-free hill tops
40% reducing to 20%, cloud will become extensive at low levels during the morning.
Low cloud and visibility
Scattered cloud layers above 300m will become more extensive at lower levels during the morning with layers of cloud above 200m likely by late morning. Visibility will be moderate or poor in intermittent snow or sleet and very poor at times on the summits with white out conditions expected with snowfall and strong winds likely.
Recent rainfall
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.8mm | 2.4mm | 16mm |
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
A dry day with some sunny spells developing, feeling fresh in the easterly winds although these will be lighter than on Wednesday. Fresh snow may make walking progress tricky on the hills.
Chance of cloud-free hill tops
95%, most summits will be clear.
Maximum wind speed expected
Southeasterly 15-20mph.
Temperature
- At 600m Minus 2 Celsius
- Valley Plus 1 rising to 5 Celsius.
- Freezing level 400m rising to 500m
Low cloud and visibility
Very little cloud below the summits expected, perhaps patches at times. Good or very good visibility is expected.
Mountain weather information
Fri 20 Feb
Milder air will spread in from the southwest with plenty of cloud and outbreaks of rain on Friday morning, accompanied by strong southwesterly winds. Rain likely to ease later in the afternoon with a few brighter spells possible. Freezing level lifting from 600m to above all summits.
Sat 21 Feb
Strong southwesterly winds will push in cloudy conditions and outbreaks of light rain and drizzle, rain clearing later in the day, low cloud likely to be a hazard. Freezing level above all summits.
Sun 22 Feb
Outbreaks of rain and strong winds, possibility of gales, likely to continue later in the weekend with the risk of low cloud conditions, freezing level likely to be above all summits.
Summit specific forecast
Mountain summit forecast map
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.