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Brecon Beacons

Confidence

High confidence for the general story across much of the period, but moderate for extent of cloud and fog overnight into Sunday, and for sunny spells on Sunday.

  • Saturday
  • Sunday
  • Further outlook

Saturday 20 October 2018

Weather hazards

Poor visibility Low likelihood Hide 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.

Headline

Dry, with early cloud, mist and fog lifting to sunny spells.

Weather at 600m

06:00 09:00 12:00 15:00 18:00 21:00
Sunny intervals Sunny day Sunny day Sunny intervals Clear night Partly cloudy night
10% 10% <05% <05% <05% 10%
Chance of precipitation
3,100 3,200 3,300 3,500 3,400 3,400
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

06:00 09:00 12:00 15:00 18:00 21:00
600m SW 9 13 SW 10 15 SW 12 18 W 12 17 W 10 15 W 9 15
300m SW 5 11 SW 6 11 SW 8 17 W 8 17 W 6 13 SW 6 12
Valley SW 4 8 SW 5 9 SW 7 16 W 7 17 W 5 13 W 5 11

Temperature (°C) By altitude above mean sea level

06:00 09:00 12:00 15:00 18:00 21:00
600m 8 9 10 11 9 9
300m 9 11 14 14 11 9
Valley 8 11 14 14 11 10

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

06:00 09:00 12:00 15:00 18:00 21:00
600m 6 6 8 8 7 7
300m 7 10 12 12 10 8
Valley 7 10 13 13 11 9
Sunrise: 07:46   Sunset: 18:10
Moon phase: Waxing gibbous

Weather

There will be some early valley mist and fog, with patchy cloud also obscuring some hills during the morning. This is likely to clear by midday, with largely unbroken sunshine developing across the Brecon Beacons. Into the evening cloud could return to northern hills, however further south clear skies are likely to persist.

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

40% during the morning, with occasional cloud at 500m, and some patchy mist or fog within the valleys. This soon lifting, with 90% chance of cloud free tops, although some patchy cloud possible around 800m. Falling to 70% in the north after dark, as cloud returns around 600m.

Visibility

Visibility will be good during the day with views over 10km, however it may be around 2-5km first thing in the morning, and notably less in early mist and fog patches.

Meteorologist's view

A largely fine day, with mild temperatures and plenty of sunshine, once any early poor conditions lift.

Recent rainfall

  • Location: Neuadd (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 03:00 on Sat 20 Oct 2018
  • Last 24 hours: 0.2mm
  • Last 48 hours: 0.4mm
  • Last 72 hours: 0.4mm

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.

Sunday 21 October 2018

Sunrise: 07:48   Sunset: 18:08
Moon phase: Waxing gibbous

Weather

A dull start with some low cloud, along with mist and fog at low levels. However this likely clearing to give some brief sunshine for a time. Through the afternoon cloud will thicken, with a few outbreaks of rain also spreading south. This will eventually clear with further cloud breaks developing after dark, but also turning rather chilly.

Maximum wind speed expected

Southwesterly 20mph veering Northwesterly in the evening.

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

20% at first with extensive cloud at 500m, and some mist or fog in the valleys. This lifting to 70% during the morning, with patchy cloud around 600m, but soon falling again to 30% during the afternoon as thicker cloud develops around 500m with the rain band spreading southeast. This then increasing again after dark, to around 80% with cloud breaking, and lifting to 700m.

Temperature

  • At 600m Plus 9 Celsius falling to 3 Celsius overnight.
  • Valley Plus 14 Celsius falling to 8 Celsius.
  • Freezing level Above the summits

Visibility

Visibility will be moderate or poor in the morning, perhaps briefly lifting to good around midday, but soon falling to again as rain spreads south. Visibility then becoming very good later in the evening.

Monday 22 October 2018

Sunrise: 07:50   Sunset: 18:06
Moon phase: Waxing gibbous

A fine dry day with largely unbroken sunshine. Despite largely light winds, it will be feeling colder than recent days. Whilst further cloud and milder temperatures are likely to spread across the Brecon Beacons during the late afternoon and evening. Most summits will remain clear.

Tuesday 23 October 2018

Sunrise: 07:52   Sunset: 18:04
Moon phase: Full

A cloudy start to the day, with summits obscured. Through the morning, cloud will break, with some sunny spells developing, the best of which will be in the east. Rather breezy, but feeling mild.

Wednesday 24 October 2018

Sunrise: 07:53   Sunset: 18:02
Moon phase: Full

A very similar day to Tuesday, with early cloud and obscured summits gradually clearing, and the best of the brighter spells in the east. However winds will gradually ease.

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