Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High confidence for rainfall and winds through Friday. Moderate confidence in details regarding precipitation and winds on Saturday associated with Storm Dave.
This evening forecast
Turning blustery and wet through the rest of Thursday.
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.
Heavy Persistent Rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and become impassable. There may also be a risk of flooding in valleys or glens. If there is snow cover, a heightened avalanche hazard is possible and avalanche reports should be consulted where available.
Mountain weather forecast
A murky and damp day with low cloud and blustery southwesterly 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) |
80% | 80% | 80% | 80% | 80% | 40% | 70% | 30% |
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 |
SW
24
|
SW
24
|
SW
25
|
SW
25
|
W
30
|
W
29
|
W
21
|
W
15
|
| 300m |
SW
14
|
SW
14
|
SW
15
|
SW
15
|
SW
19
|
W
18
|
W
12
|
W
9
|
| Valley |
SW
11
|
SW
12
|
SW
13
|
SW
13
|
SW
16
|
W
16
|
W
11
|
W
8
|
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 | 31 | 31 | 33 | 34 | 39 | 38 | 29 | 22 |
| 300m | 29 | 31 | 31 | 31 | 37 | 35 | 25 | 19 |
| Valley | 26 | 29 | 29 | 29 | 35 | 34 | 24 | 18 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
4°
|
6°
|
7°
|
8°
|
8°
|
8°
|
7°
|
5°
|
| 300m |
6°
|
8°
|
9°
|
10°
|
11°
|
11°
|
9°
|
7°
|
| Valley |
7°
|
9°
|
10°
|
10°
|
11°
|
11°
|
10°
|
8°
|
| Freezing Level |
1,400m
|
1,900m
|
1,900m
|
2,000m
|
1,800m
|
2,000m
|
1,600m
|
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 |
-2°
|
1°
|
3°
|
3°
|
4°
|
3°
|
2°
|
1°
|
| 300m |
2°
|
4°
|
6°
|
6°
|
7°
|
7°
|
6°
|
5°
|
| Valley |
4°
|
6°
|
7°
|
8°
|
8°
|
8°
|
7°
|
6°
|
Additional weather information
Meteorologist's view
Windy on the summits with a risk of getting very cold due to the wet conditions. Winds may gust 5-10mph stronger than in the table above. Therefore, multiple layers of warm and waterproof clothing is advised if heading to the summits.
Weather
Low cloud and outbreaks of rain and drizzle for much of the day. An improvement through the afternoon but a chance of heavy showers early in the evening.
Chance of cloud-free hill tops
10% but locally 40% in the east, increasing more generally to 60% by the evening.
Low cloud and visibility
Widespread cloud above 300-500m with periods of cloud above 100-200m in the south and west. Cloud bases rising to periods above 400-600m through the afternoon, lowest in the south and west. Very good visibility in general but poor in drizzle and very poor in cloud with widespread hill fog.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 1.4mm | 1.4mm | 1.4mm |
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
Storm Dave is set to bring strong winds through Saturday, with some very strong winds developing from the afternoon onwards. Showers through the morning then dry for the afternoon with occasional brighter intervals.
Chance of cloud-free hill tops
30% becoming 80% from early afternoon.
Maximum wind speed expected
Southwesterly 30-40mph increasing to 50-60mph by mid-afternoon.
Temperature
- At 600m Plus 4 Celsius becoming plus 9 Celsius.
- Valley Plus 8 Celsius becoming 14 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Poor visibilities with cloud bases below summits through much of the morning. Away from low cloud, visibilities will be good but poor in any rain. Periods of cloud above 300-500m, perhaps extensive for a few hours through the morning. Rising to just patches above 700-800m later.
Mountain weather information
Sun 5 Apr
Sunrise:
Sunset:
A much colder day with sunny spells and showers, these wintry on summits with a mixture of hail and snow. Moderate to strong westerly winds giving a severe wind chill on summits. Freezing level 700-800m.
Mon 6 Apr
Sunrise:
Sunset:
Dry with increasing amounts of sunshine giving excellent visibilities. Moderate to strong southerly or southeasterly winds but not feeling as cold. Moderate UV levels. Freezing levels rising to above the summits.
Tue 7 Apr
Sunrise:
Sunset:
Cloudy through much of the day with some showery outbreaks likely. Strong to gale force easterly winds becoming southerly.
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.