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Snowdonia

Confidence

High for generally fresher conditions. Low for extent of low cloud at first.

  • Thursday
  • Friday
  • Further outlook

Thursday 22 June 2017

Weather hazards

Poor visibility High 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.

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

Cloudy with scattered showers. But much fresher than of late.

Weather at 800m

0600 0900 1200 1500 1800 2100
30% 40% 20% 10% 00% 00%
Chance of precipitation
2,700 2,800 2,800 2,400 2,400 2,900
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
900m SW 10 13 NW 12 16 NW 16 22 W 17 23 SW 19 25 SW 24 31
600m S 11 16 NW 9 12 NW 13 18 W 13 20 SW 14 21 SW 17 23
300m S 7 15 NW 6 11 NW 7 15 W 7 18 SW 7 18 SW 8 20
Valley SW 14 23 NW 11 18 NW 11 20 W 16 27 SW 18 30 SW 16 28

Temperature (°C) By altitude above mean sea level

0600 0900 1200 1500 1800 2100
900m 11 10 10 9 9 8
600m 12 12 12 12 11 10
300m 13 13 14 15 14 13
Valley 13 15 15 17 16 14

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

0600 0900 1200 1500 1800 2100
900m 9 7 7 6 5 4
600m 10 10 9 9 9 7
300m 12 13 13 14 13 11
Valley 12 14 15 15 14 12
Sunrise: 04:50   Sunset: 21:47
Moon phase: Waning crescent

Weather

Cloudy at first with outbreaks of mainly light rain and drizzle. Some drier brighter spells are possible through the afternoon.

Chance of cloud-free mountain/hill tops at 800m

10% at first with persistent extensive cloud around 400 metres but improving to 30% during the afternoon.

Visibility

Poor at first but becoming generally moderate to good in the afternoon.

Ground conditions

No adverse ground conditions reported on 22 of Jun

Friday 23 June 2017

Sunrise: 04:50   Sunset: 21:47
Moon phase: New

Weather

Cloudy with outbreaks of rain, heavy at times. Windy.

Temperature

  • At 800m Plus 11 Celsius
  • Valley Plus 9 rising to 16 Celsius.
  • Freezing level Above summits.

Visibility

Poor, moderate at times further east.

Chance of cloud-free mountain/hill tops at 800m

10%.

Maximum wind speed expected

South-westerly 45 mph.

Saturday 24 June 2017

Sunrise: 04:50   Sunset: 21:47
Moon phase: New

Cloudy with occasional rain. Moderate visibility. Brightening up later. Windy.

Sunday 25 June 2017

Sunrise: 04:51   Sunset: 21:47
Moon phase: New

Mainly dry with good clear or sunny periods. Excellent visibility. Winds easing later.

Monday 26 June 2017

Sunrise: 04:51   Sunset: 21:47
Moon phase: New

Mainly dry with good clear or sunny periods. Good to very good visibility. Light winds.

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