Mountain weather
Brecon Beacons Mountain weather forecast table
Confidence
High confidence for dry bright skies on Tuesday evening and of grey skies, low cloud, hill fog and a brisk breeze on Wednesday and Thursday. Low confidence of timings of cloud and rain on Wednesday and Thursday. Conditions on Thursday are particularly uncertain and it may be that there isn't much rain at all. Given the lead time there is fairly high confidence of dry bright weather on Friday, Saturday and Sunday.
This evening forecast
Tuesday evening will be dry, with light winds, good visibility and plenty of late sunshine.
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.
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.
Mountain weather forecast
Low cloud, rain and strong winds in the morning. Brightening up later.
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
Weather (at 600m) |
|
|
|
|
|
|
|
|
Chance of precipitation (at 600m) |
20% | 60% | >95% | >95% | >95% | 30% | 10% | <05% |
Wind direction and speed (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
SW
16
|
SW
18
|
SW
21
|
SW
22
|
W
22
|
W
21
|
W
18
|
W
16
|
| 300m |
SW
10
|
SW
10
|
SW
13
|
SW
15
|
W
16
|
W
14
|
W
13
|
W
10
|
| Valley |
SW
8
|
SW
8
|
SW
11
|
SW
13
|
W
15
|
W
13
|
W
12
|
W
9
|
Wind gust (mph)
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m | 22 | 25 | 28 | 30 | 31 | 31 | 26 | 25 |
| 300m | 21 | 21 | 26 | 29 | 30 | 27 | 25 | 22 |
| Valley | 21 | 19 | 24 | 27 | 30 | 28 | 25 | 21 |
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
7°
|
7°
|
8°
|
9°
|
10°
|
11°
|
11°
|
9°
|
| 300m |
9°
|
10°
|
10°
|
11°
|
13°
|
14°
|
14°
|
11°
|
| Valley |
10°
|
10°
|
10°
|
11°
|
13°
|
14°
|
14°
|
12°
|
| Freezing Level |
1,600m
|
1,500m
|
2,000m
|
2,400m
|
2,000m
|
1,900m
|
1,800m
|
2,300m
|
Altitude above mean sea level
| 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
|---|---|---|---|---|---|---|---|---|
| 600m |
3°
|
3°
|
4°
|
5°
|
6°
|
8°
|
8°
|
6°
|
| 300m |
7°
|
7°
|
7°
|
8°
|
10°
|
11°
|
11°
|
9°
|
| Valley |
8°
|
8°
|
8°
|
9°
|
11°
|
12°
|
12°
|
10°
|
Additional weather information
Meteorologist's view
Wind speeds and temperatures in these tables look realistic. Heavy showers on Tuesday and added rain on Wednesday mean that it may be quite wet underfoot, with large puddles and bogs, and fast moving streams.
Weather
Low cloud and strong winds will move over the Brecons soon after midnight, with accompanying hill fog and drizzle. Rain will arrive from around 05:00 with some heavy spells over the next three or four hours. The rain will then gradually ease, becoming light and drizzly, but low cloud, strong winds and hill fog are likely to persist until around 14:00. The weather will be much improved after that, but it will stay breezy and the odd light shower remains possible. The evening will be dry and bright with much less cloud.
Chance of cloud-free hill tops
Between 00:00 and 14:00. 10% with thick low cloud covering the hills down to 200m above sea level. Between 14:00 and midnight. 80% with the odd shower cloud obscuring the highest peaks.
Low cloud and visibility
Between midnight and 14:00: Thick hill fog is likely on any hills above 200m above sea level. Although patchy, visibility is likely to be below 50m at times. In the valleys, it will be misty with rain and drizzle so visibility is likely to drop to 4000m at times. After 14:00 Good visibility is expected at all levels, with fine views of surrounding hills.
Recent rainfall
Location: Neuadd (Near Pontsticill)
Altitude: 353m
| Last 24 hours | Last 48 hours | Last 72 hours |
|---|---|---|
| 3.6mm | 3.8mm | 4.2mm |
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
Low cloud and strong winds will again move over the Brecons soon after midnight, with accompanying hill fog and drizzle. These may well persist all through the day, not clearing until late evening. Light and patchy rain is likely at times during the day.
Chance of cloud-free hill tops
Between 00:00 and 21:00. 10% with thick low cloud covering the hills down to 200m above sea level. Between 21:00 and midnight. 80% ... but it will be dark.
Maximum wind speed expected
Mean wind speeds of 30 mph and gusts of up to 45mph on the summits any time during the day.
Temperature
- At 600m 5C at dawn, rising to 9C in the afternoon.
- Valley 10 C at dawn, rising to 15 C in the afternoon.
- Freezing level Well above summits.
Low cloud and visibility
Between midnight and 21:00: Thick hill fog is likely on any hills above 200m above sea level. Although fog will be patchy, visibility is likely to be below 50m at times. In the valleys, it will be misty with rain and drizzle so visibility is likely to drop to 4000m at times.
Mountain weather information
Fri 27 May
Sunrise:
Sunset:
Dry and clear with warm sunshine and light winds. Maximum temperatures around 18 C in the valleys.
Sat 28 May
Sunrise:
Sunset:
Dry and clear with warm sunshine and light winds. Maximum temperatures around 19 C in the valleys.
Sun 29 May
Sunrise:
Sunset:
Probably dry and bright, but more cloudy and breezy than Saturday. Max temperatures 17C.
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 Brecon Beacons is a mountain range in South Wales comprising six main peaks, with the highest peak, Pen y Fan, standing at 886 metres.
The summits of each peak form a long ridge with four of the peaks forming a horseshoe shape around the head of the Taf Fechan River which flows away to the south-east. The Brecon Beacons is said to be named after the ancient practice of lighting signal fires (beacons) on mountains to warn of attacks by invaders, or more recently to commemorate public and national events such as coronations or the Millennium.
For ardent mountain climbers, the Brecon Beacons National Park is among the best that Britain has to offer. While it doesn't have some of the headline-grabbing peaks of Snowdonia or the Scottish Highlands, it fits scores of slightly smaller mountains into its relatively compact 519 square mile area. These include the area's highest peak, Pen y Fan, as well as the marginally smaller Corn Du (873 metres). Both offer rather hospitable, anvil-shaped summits to those who reach the top, with plenty of space for rest and photographs, before tackling the descent.