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Brecon Beacons

Confidence

High for general trend until Monday. Low thereafter.

  • Saturday
  • Sunday
  • Further outlook

Saturday 24 June 2017

Weather hazards

Poor visibility Low likelihood Show less detail

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 Low likelihood Show more details

Prolonged exposure to heavy rain can result in drenched clothing and a risk of hypothermia if not wearing good quality waterproofs. Terrain may turn increasingly boggy underfoot, while mountain streams will rapidly rise into spate and may 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.

Strong sunlight Low likelihood Show more details

Strong sunlight has a heightened effect at altitude with a higher risk of sunburn and eye damage. High temperatures, especially when combined with high humidity, may lead to heat stroke or heat exhaustion. Snow-covered terrain will increase the effect of harmful UV rays, especially on the eyes. It is advisable to wear sun block and good quality eye-protection even on overcast days.

Forecast

Cloud and rain for much of the day. Brighter by evening.

Weather at 600m

0600 0900 1200 1500 1800 2100
70% 70% 60% 80% 20% 10%
Chance of precipitation
2,800 2,800 2,700 2,500 2,800 3,000
Freezing level (m)
The level above which snow is expected to settle or the ground is expected to be frozen

Wind speed and direction (mph) By altitude above mean sea level

0600 0900 1200 1500 1800 2100
600m W 15 19 SW 15 21 SW 18 26 W 18 25 W 17 23 W 17 24
300m W 8 16 SW 9 19 SW 11 24 W 11 24 W 10 21 W 10 21
Valley W 9 17 W 9 20 SW 11 24 W 10 23 W 10 21 W 9 20

Temperature (°C) By altitude above mean sea level

0600 0900 1200 1500 1800 2100
600m 12 12 12 13 13 11
300m 14 15 16 15 15 14
Valley 14 16 17 16 16 14

Feels like temperature (°C) By altitude above mean sea level

0600 0900 1200 1500 1800 2100
600m 9 9 9 10 10 8
300m 12 13 14 14 13 12
Valley 13 14 15 15 14 13
Sunrise: 04:55   Sunset: 21:37
Moon phase: New

Weather

Cloudy with rain at times through much of the day. These mainly affecting western slopes where some heavier bursts are possible. Little change through the morning, although one or two drier and brighter interludes are possible. By late afternoon things should start to turn drier and brighter from the northwest with a fine evening to follow.

Chance of cloud-free mountain/hill tops at 600m

10% becoming 90% by evening.

Visibility

Moderate to poor in rain. Becoming very good by evening.

Meteorologist's view

Nothing to add.

Recent rainfall

  • Location: Neuadd Rain (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 03:00 on Sat 24 Jun 2017
  • Last 24 hours: 3.2mm
  • Last 48 hours: 3.2mm
  • Last 72 hours: 3.2mm

Rainfall data provided by the Environment Agency. The Met Office is not responsible for content provided by third parties and may remove this data without warning.

Sunday 25 June 2017

Sunrise: 04:55   Sunset: 21:37
Moon phase: New

Weather

Cloud could increase again through the early hours to bring some light rain. Becoming brighter through the afternoon with some sunshine, although the odd shower is possible.

Temperature

  • At 600m Plus 7 C.
  • Valley Plus 8 C rising to Plus 17 C.
  • Freezing level Above the summits.

Visibility

Poor to moderate. Becoming good later.

Chance of cloud-free mountain/hill tops at 600m

10% at first, becoming 60% by evening.

Maximum wind speed expected

W to NW 20 to 25 mph.

Monday 26 June 2017

Sunrise: 04:56   Sunset: 21:37
Moon phase: New

Fine and dry for most of the day.

Tuesday 27 June 2017

Sunrise: 04:56   Sunset: 21:37
Moon phase: Waxing crescent

After a fine morning scattered slow moving heavy showers may develop in the afternoon.

Wednesday 28 June 2017

Sunrise: 04:57   Sunset: 21:37
Moon phase: Waxing crescent

Sunny intervals and showers. The showers could be heavy and slow moving in the light winds.

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