Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Moderate confidence in the timing of Friday's rain. Then high confidence for it to turn increasingly settled into the weekend.
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
Band of heavy rain clearing to sunny spells later.
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
Chance of precipitation (at 600m) |
70% | 80% | 60% | 40% | <05% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
S
26
|
S
24
|
SW
22
|
SW
21
|
SW
18
|
SW
18
|
| 300m |
S
14
|
S
12
|
SW
12
|
SW
13
|
SW
11
|
SW
11
|
| Valley |
SW
10
|
S
9
|
SW
10
|
SW
12
|
SW
11
|
SW
9
|
Wind gust (mph)
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m | 33 | 30 | 28 | 28 | 25 | 24 |
| 300m | 31 | 27 | 24 | 25 | 22 | 22 |
| Valley | 28 | 24 | 22 | 24 | 23 | 22 |
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
7°
|
8°
|
8°
|
8°
|
7°
|
6°
|
| 300m |
10°
|
10°
|
11°
|
12°
|
10°
|
8°
|
| Valley |
10°
|
11°
|
12°
|
12°
|
10°
|
8°
|
| Freezing Level |
2,000m
|
2,100m
|
2,000m
|
1,500m
|
1,200m
|
1,200m
|
Altitude above mean sea level
| Time | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|
| 600m |
2°
|
3°
|
4°
|
4°
|
3°
|
1°
|
| 300m |
7°
|
8°
|
9°
|
9°
|
7°
|
5°
|
| Valley |
8°
|
9°
|
10°
|
10°
|
8°
|
6°
|
Additional weather information
Meteorologist's view
Walking conditions will be much improved from mid-afternoon onwards, though paths may still be slippery following morning rain.
Weather
A band of rain with heavy outbreaks approaching during the morning and clearing the east of the Park by mid-afternoon. Drier and brighter with plenty of late afternoon and evening sunshine before becoming cloudier during the night.
Chance of cloud-free hill tops
20% gradually rising to 90% through the afternoon, 70% by midnight.
Low cloud and visibility
Cloud initially obstructing hills above 400-500m, with poor visibility in cloud or light rain and drizzle. Visibility improving through the afternoon to good or very good as rain clears and cloud lifts above the summits. Western slopes seeing cloud lowering again to 600-700m into the evening.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 3mm | 14.4mm | 18.6mm |
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
Perhaps some valley mist and fog early on, otherwise a mixture of clear spells and patchy cloud on western slopes to start the day. Cloud bubbling up more widely during the day, potentially bringing an isolated shower, and then dissipating into the evening to leave clear spells.
Chance of cloud-free hill tops
60% initially, rising to 90% from late morning.
Maximum wind speed expected
15-20mph winds on the summits.
Temperature
- At 600m Plus 3 Celsius, rising to plus 7 Celsius.
- Valley Plus 5 Celsius, rising to plus 12 Celsius.
- Freezing level Above the summits.
Low cloud and visibility
Patchy cloud on western slopes at 500-600m to begin, this lifting above the summits by late morning. Generally good visibility, but briefly dropping to moderate in a passing light shower.
Mountain weather information
Sun 19 Apr
Sunrise:
Sunset:
A dry day, with light winds. Plenty of bright and sunny spells even as cloud bubbles up during the day, and summits are likely to remain clear. Mist and fog patches to start.
Mon 20 Apr
Sunrise:
Sunset:
Another fine and dry day ahead, though perhaps with cloud becoming more widespread into the afternoon. This will be accompanied by light winds. Freezing level hovering just above the summits.
Tue 21 Apr
Sunrise:
Sunset:
Slightly thicker cloud may bring the occasional shower over the hills, but still with plenty of dry intervals. Freezing levels remaining above the summits. Winds picking up to a moderate/fresh northeasterly. Freezing level dropping to 800-900m.
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.