Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for a mostly fine and dry day on Wednesday. Also high for winds strengthening Thursday, but moderate for the strength of the strongest gusts, and the timing for the heaviest rain. Confidence then high for colder conditions to follow, however the extent of any snowfall, and also the snow-level on the hills is only moderate confidence. This confidence becoming low for any details by the weekend.
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
Largely dry with sunny spells and just the odd shower. Brisk winds
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
20% | 20% | 20% | 20% | 20% | 20% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
W
23
|
W
23
|
W
22
|
W
21
|
SW
19
|
SW
22
|
| 300m |
W
13
|
W
13
|
W
15
|
W
14
|
W
12
|
SW
14
|
| Valley |
W
12
|
W
12
|
W
14
|
W
14
|
W
10
|
SW
11
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 32 | 29 | 30 | 29 | 27 | 30 |
| 300m | 28 | 25 | 28 | 27 | 25 | 30 |
| Valley | 29 | 24 | 28 | 27 | 23 | 27 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
3°
|
3°
|
4°
|
5°
|
4°
|
3°
|
| 300m |
6°
|
6°
|
8°
|
8°
|
6°
|
6°
|
| Valley |
6°
|
7°
|
8°
|
9°
|
7°
|
6°
|
| Freezing Level |
900m
|
900m
|
900m
|
900m
|
900m
|
1,000m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
-3°
|
-3°
|
-1°
|
0°
|
-1°
|
-2°
|
| 300m |
2°
|
2°
|
4°
|
5°
|
3°
|
2°
|
| Valley |
3°
|
4°
|
5°
|
6°
|
4°
|
3°
|
Additional weather information
Meteorologist's view
Cold across the tops, especially in the breeze. Warm, windproof layers essential, especially if stopping on the summits.
Weather
A fine but breezy day, with cloud largely above summit level and some sunny spells likely. The odd shower cannot be ruled out, mainly in the west. Feeling rather cold in the brisk breeze, especially on the summits. Winds strengthening a little after dark.
Chance of cloud-free hill tops
90% in the east, 80% in the west through the morning.
Low cloud and visibility
The odd patch of cloud obscuring summits above 700m during the morning in the west, with cloud lifting a little through the day to be largely above summits by the afternoon. However, any showers could lead to this briefly dropping back to 700m at times. Outside of cloud, visibility will be good to very good, falling to moderate in any showers.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 11.2mm | 14mm | 14.6mm |
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
Winds strengthening through the morning, with outbreaks of rain and drizzle, more persistent on western slopes. Upland gales are likely to develop, as a band of rain moves southeast though the evening. This heavy and very gusty for a time, and the odd rumble of thunder cannot be ruled out as the heaviest bursts move through, perhaps clearing by midnight.
Chance of cloud-free hill tops
Falling through the morning to be 20% by midday
Maximum wind speed expected
Southwesterly 40-50mph with gusts 55-65 mph.
Temperature
- At 600m Plus 4 Celsius.
- Valley Plus 6 Celsius rising to Plus 13 Celsius
- Freezing level Above the summits.
Low cloud and visibility
Cloud thickening to obscure hills above 800m during the early hours, before lowering to 500m through the morning, most widely in the west. Moderate to Good visibility at first, but poor in rain, and briefly poor to very poor as any heavy rain moves through.
Mountain weather information
Fri 13 Mar
Sunrise:
Sunset:
Bright spells and a few showers, falling as snow above 400m. Winds easing compared to Thursday, but still rather breezy, with a notable wind chill. Freezing level 600m, perhaps briefly 300m.
Sat 14 Mar
Sunrise:
Sunset:
Any showers easing early Saturday, with freezing levels rising to around 800m by midday. Further showers, briefly snow above 800m, spreading east later, with freezing levels rising above summits.
Sun 15 Mar
Sunrise:
Sunset:
Winds strengthening, with occasional rain early on Sunday. Occasional showers follow, perhaps turning to snow above 700m during the late afternoon and evening as freezing levels fall to 800m
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.