Mountain weather
Bannau Brycheiniog / Brecon Beacons Mountain weather forecast table
Confidence
High for a very changeable weather pattern to persist over the next few days. Some uncertainty regarding rainfall details, chiefly as persistent rain gives way to more showery weather this weekend.
This evening forecast
Cloudy with outbreaks of rain, some heavy. Low cloud giving areas of fog, especially on the summits. A fresh to strong and rather gusty east to southeasterly wind, especially on the hill tops.
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.
Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.
Strong Sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.
Mountain weather forecast
A cloudy and windy start with heavy rain at times and fog affecting the hills. Slowly becoming drier and less windy, with a few cloud breaks developing later.
| 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) |
90% | 90% | 90% | 80% | 60% | 20% | 10% | <05% |
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 |
E
22
|
E
25
|
E
21
|
E
22
|
E
23
|
E
20
|
E
17
|
E
14
|
| 300m |
E
11
|
E
13
|
E
12
|
E
13
|
E
14
|
E
12
|
E
9
|
E
8
|
| Valley |
E
10
|
E
10
|
E
10
|
E
11
|
E
12
|
E
11
|
E
8
|
NE
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 | 30 | 34 | 30 | 31 | 32 | 29 | 24 | 22 |
| 300m | 24 | 27 | 25 | 26 | 28 | 24 | 19 | 18 |
| Valley | 23 | 25 | 23 | 24 | 26 | 22 | 18 | 19 |
Altitude above mean sea level
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| 600m |
7°
|
6°
|
6°
|
6°
|
7°
|
8°
|
8°
|
6°
|
| 300m |
8°
|
8°
|
8°
|
8°
|
9°
|
11°
|
11°
|
8°
|
| Valley |
9°
|
9°
|
8°
|
9°
|
10°
|
12°
|
11°
|
9°
|
| Freezing Level |
2,100m
|
2,100m
|
2,000m
|
2,000m
|
2,100m
|
2,200m
|
2,100m
|
2,100m
|
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°
|
1°
|
1°
|
2°
|
4°
|
4°
|
2°
|
| 300m |
5°
|
5°
|
5°
|
5°
|
6°
|
8°
|
9°
|
6°
|
| Valley |
6°
|
6°
|
6°
|
6°
|
7°
|
9°
|
10°
|
7°
|
Additional weather information
Meteorologist's view
The heavy rain and blustery conditions will make hill walking difficult during the first part of the day.
Weather
A cloudy and windy start with heavy rain at times, especially on the summits and along east to southeasterly facing slopes. Fog affecting the hills, especially the tops. Rain slowly easing and becoming patchy during the morning. Mostly dry during the afternoon and evening with a few cloud breaks developing later, and winds falling much lighter.
Chance of cloud-free hill tops
10% or less during the early to mid morning, then increasing steadily to 70% or more during the afternoon and 80% or more during the evening.
Low cloud and visibility
Very poor visibility in fog patches and rain at first, especially above about 400 metres, but cloud bases lifting above the summits fairly readily during the morning, and remaining above the summits thereafter. Visibility becoming good, locally very good for the afternoon and evening.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 9.4mm | 9.4mm | 19.6mm |
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
A chilly start perhaps with a slight frost on the hill tops. Mostly dry during the day with lighter winds than recently, and some bright or sunny spells. An increasing chance of some light showers developing towards and into the evening.
Chance of cloud-free hill tops
70% or more, lowering to around 50% for a time early morning, then rising 70% or more during the day. Lowering to around 40% during the evening given the shower risk.
Maximum wind speed expected
E 12 to 15mph, gusts to 22mph, easing 10 mph or less, with gusts 15mph or less.
Temperature
- At 600m Zero to PS1C, rising to PS9C.
- Valley PS3C rising to PS14C.
- Freezing level Briefly near the summits around dawn, otherwise above them.
Low cloud and visibility
Cloud tops generally above the summits, though lowering close to them if showers develop during the evening.
Mountain weather information
Mon 21 Apr
Sunrise:
Sunset:
Sunshine and scattered showers, showers perhaps heavy at times with briefly poor visibility. Breezy on the hill tops. Freezing levels above summits throughout.
Tue 22 Apr
Sunrise:
Sunset:
Little change, another day of sunshine and scattered showers, with breezy conditions on the summits. Freezing levels above summits throughout.
Wed 23 Apr
Sunrise:
Sunset:
The mix of sunshine and showers continues, but showers likely to be mostly light and fewer in number than of late. A northeasterly breeze. Freezing levels above summits throughout.
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.