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Brecon Beacons

Confidence

High confidence for unsettled conditions over the next couple of days but lower confidence for exact timing of rain and cloud base height. High confidence for more settled conditions in the latter part of the week.

  • This evening
  • Tuesday
  • Wednesday
  • Further outlook

Monday 18 June 2018

Sunrise: 04:54   Sunset: 21:36
Moon phase: Waxing crescent

A cloudy evening for most of the Brecon Beacons with the cloud thickening enough to give some outbreaks of light rain and drizzle, cloud bases will be well below summits with poor visibility.

Tuesday 19 June 2018

Weather hazards

Poor visibility High 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

A cloudy day with light rain and drizzle throughout the day, cloud bases will be low with poor visibility. Moderate southwesterly winds.

Weather at 600m

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Overcast Drizzle Light rain Drizzle Light rain Drizzle Drizzle Cloudy
60% 90% 90% 90% 90% 90% 70% 40%
Chance of precipitation
3,500 3,400 3,500 3,300 2,900 2,700 2,700 2,700
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

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m SW 19 25 SW 18 23 SW 17 22 SW 21 27 SW 22 29 SW 21 28 SW 22 29 SW 21 28
300m SW 11 23 W 10 21 SW 9 18 SW 11 23 SW 13 26 SW 13 27 SW 12 24 SW 9 20
Valley W 10 22 W 9 21 SW 7 17 SW 9 21 SW 11 24 SW 12 25 SW 9 21 SW 9 20

Temperature (°C) By altitude above mean sea level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m 12 12 12 13 13 13 13 12
300m 14 13 14 14 15 15 15 13
Valley 14 14 14 15 16 16 15 14

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

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
600m 9 9 9 9 10 10 9 8
300m 12 12 12 13 13 13 13 12
Valley 13 13 13 13 14 14 14 13
Sunrise: 04:54   Sunset: 21:36
Moon phase: Waxing crescent

Weather

A dull day with thick cloud giving light rain and drizzle cloud bases will be lower than most summits. Some heavier spells of rain likely particularly in the southwest.

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

20%, Some breaks in the cloud will develop late on Tuesday evening with some summits clearing.

Visibility

Poor visibility of a few kilometres or less in the rain and drizzle.

Meteorologist's view

Moderate south westerly winds with strong gusts on the summits.

Recent rainfall

  • Location: Neuadd (Near Pontsticill)
  • Altitude: 353m
  • Measurement date: 15:00 on Mon 18 Jun 2018
  • Last 24 hours: 3mm
  • Last 48 hours: 4.6mm
  • Last 72 hours: 6.2mm

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.

Wednesday 20 June 2018

Sunrise: 04:54   Sunset: 21:37
Moon phase: First quarter

Weather

A cloudy day with outbreaks of rain and drizzle becoming heavy at times, cloud bases are expected to be well below summits until the evening. Feeling cooler as the winds swing round to a north westerly direction in the evening.

Maximum wind speed expected

Southwesterly winds 20-25mph with gusts around 30mph on summits, later winds will veer Northwesterly and ease to 15mph with gusts 20mph.

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

20% chance of cloud free summits during the day increasing to 50% by late evening.

Temperature

  • At 600m Plus 11 decreasing to plus 8 by the evening.
  • Valley Plus 13 decreasing to Plus 10 by the evening.
  • Freezing level Above the summits.

Visibility

Poor or very poor during the day with little chance of any views from the summits becoming moderate in the evening.

Thursday 21 June 2018

Sunrise: 04:54   Sunset: 21:37
Moon phase: First quarter

Patches of mist and fog are likely to have formed overnight but these will be quick to clear with a mainly dry and bright day with good sunny intervals and excellent visibility. Feeling cool in the moderate northwesterly winds with strong gusts on summits and ridges.

Friday 22 June 2018

Sunrise: 04:54   Sunset: 21:37
Moon phase: First quarter

After a clear night with very little cloud it will be a sunny start to the day, some cloud will develop during the day in the west. Moderate northwesterly winds with excellent visibility and good views from the summits.

Saturday 23 June 2018

Sunrise: 04:55   Sunset: 21:37
Moon phase: First quarter

A mixture of cloud but some sunny intervals likely. Cloud may thicken enough to give a few sports of rain in places. Light west or northwesterly winds.

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