Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
Usual uncertainties in distribution and organisation of showers. Small uncertainties around timing of rain on Tuesday. Moderate confidence for timing of rain on Wednesday.
This evening forecast
Showers easing leaving mostly clear skies. Winds turning light. Becoming cold tonight.
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.
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.
Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
Mountain weather forecast
A chilly and cloudy start, turning wet with heavy showers and lower cloud through the day.
| 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) |
<05% | 20% | 40% | 60% | 50% | 60% | 60% | 70% |
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 |
S
11
|
S
16
|
S
21
|
SE
23
|
S
21
|
S
19
|
S
20
|
S
20
|
| 300m |
S
5
|
SE
4
|
SE
6
|
S
13
|
S
12
|
S
11
|
S
8
|
S
13
|
| Valley |
SE
2
|
E
3
|
E
6
|
SE
8
|
S
10
|
S
9
|
S
5
|
S
7
|
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 | 17 | 24 | 30 | 31 | 29 | 26 | 26 | 28 |
| 300m | 14 | 15 | 19 | 28 | 25 | 22 | 20 | 27 |
| Valley | 12 | 7 | 13 | 23 | 22 | 19 | 16 | 21 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
3°
|
3°
|
4°
|
6°
|
8°
|
9°
|
9°
|
9°
|
| 300m |
4°
|
4°
|
6°
|
8°
|
10°
|
12°
|
11°
|
11°
|
| Valley |
4°
|
4°
|
7°
|
9°
|
10°
|
12°
|
11°
|
11°
|
| Freezing Level |
1,000m
|
1,200m
|
1,700m
|
2,100m
|
2,100m
|
2,100m
|
2,600m
|
2,600m
|
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
-1°
|
-2°
|
-1°
|
0°
|
3°
|
5°
|
5°
|
5°
|
| 300m |
2°
|
2°
|
4°
|
5°
|
7°
|
9°
|
9°
|
8°
|
| Valley |
3°
|
3°
|
5°
|
7°
|
8°
|
10°
|
11°
|
10°
|
Additional weather information
Meteorologist's view
A wet day with plenty of cloud about. Waterproofs advised with sturdy footwear for wet ground conditions.
Weather
A chilly start with light winds and light rain. This rain turns more persistent with heavy bursts at times through the morning. This rain turns patchier and lighter into the early afternoon, but heavy once again into the late afternoon and evening. Winds mostly light but can be gusty in any heavier downpours.
Chance of cloud-free hill tops
40% during the morning, lowering to 20% by the late morning.
Low cloud and visibility
Cloud lowers through the morning covering hills. Cloud bases can lower further during heavy rain in the afternoon and evening.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 0.2mm | 26.2mm | 32.2mm |
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
A cloudy start with plenty of low cloud and hill fog expected. Rain will be light and patchy during the morning with a band of heavier rain expected around midday into the early afternoon. Cloud with lift with sunny spells by the mid-afternoon.
Chance of cloud-free hill tops
10% during the morning, lifting to 70% by the late afternoon.
Maximum wind speed expected
20-25 mph.
Temperature
- At 600m Plus 9 Celsius rising to plus 10 Celsius.
- Valley 12 Celsius rising to plus 15 Celsius.
- Freezing level Above summits.
Low cloud and visibility
Cloud bases around 200-400m but likely lower in heavy downpours bringing hill fog and poor visibility.
Mountain weather information
Thu 16 Apr
Sunrise:
Sunset:
Sunshine and showers. Feeling warm in the sunshine. Light to moderate southwesterly winds. Freezing level above summits.
Fri 17 Apr
Sunrise:
Sunset:
Mostly dry and bright with a risk of rain later. Light to moderate southerly winds.
Sat 18 Apr
Sunrise:
Sunset:
Sunny spells with showers in the afternoon. Winds staying light.
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.