This website uses cookies. Read about how we use cookies.

Close window

Snowdonia - Mountain weather forecast

Weather warnings

Warnings affecting Snowdonia over the next 5 days

Confidence

High for general pattern of weather, with bands of rain mixed with spells of drier brighter weather.

  • This evening
  • Thursday
  • Friday
  • Further outlook

Wednesday 20 September 2017

Sunset: 19:21
Moon phase: Waning crescent

Cloudy with light but persistent rain will continuing through the evening. It will also be breezy, with strengthening southwesterly winds.

Thursday 21 September 2017

Weather hazards

Gales High likelihood Hide detail

Progress will be impeded by very strong winds. Walking will be difficult and strenuous at times with a potential for one to be blown over in gusts. There can be a marked increase in winds through cols or on exposed ridges and summits. Distances often take longer to cover with compass bearings becoming more difficult to follow accurately.

Learn more about gales

Poor visibility High likelihood Show 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.

Learn more about poor visibility

Heavy persistent rain Medium likelihood Show detail

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.

Learn more about heavy persistent rain

Forecast

Outbreaks of rain, occasionally heavy. Drier later with some sunny spells.

Weather

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather at 800m Cloudy Heavy rain Heavy rain Heavy rain Cloudy Sunny intervals Partly cloudy night Partly cloudy night
Chance of precipitation at 800m 40% 60% 70% 90% 60% 00% 10% 10%

Wind speed and direction

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m S 34 44 S 36 45 S 38 48 W 15 21 NW 15 19 W 17 23 W 14 18 SW 19 24
600m S 25 34 S 27 36 S 28 37 W 11 17 NW 11 16 W 13 20 SW 10 13 SW 12 17
300m S 13 29 S 15 32 S 15 33 W 7 15 NW 6 14 W 8 18 SW 4 10 SW 6 13
Valley S 17 31 S 17 34 SW 18 36 W 13 24 NW 14 24 W 14 25 SW 9 15 SW 10 17

Temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m 11 ° 10 ° 9 ° 8 ° 7 ° 6 ° 5 ° 5 °
600m 12 ° 12 ° 11 ° 9 ° 9 ° 8 ° 8 ° 7 °
300m 14 ° 13 ° 13 ° 11 ° 11 ° 11 ° 10 ° 9 °
Valley 15 ° 14 ° 13 ° 12 ° 12 ° 13 ° 11 ° 9 °

Feels like temperature

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Altitude above mean sea level
900m 6 ° 5 ° 4 ° 4 ° 3 ° 1 ° 1 ° 0 °
600m 8 ° 8 ° 7 ° 7 ° 6 ° 5 ° 5 ° 4 °
300m 12 ° 11 ° 10 ° 10 ° 9 ° 10 ° 9 ° 8 °
Valley 13 ° 12 ° 11 ° 11 ° 10 ° 11 ° 10 ° 8 °

Freezing level

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Freezing level i 2,500 m 2,600 m 2,700 m 2,500 m 2,000 m 1,400 m 1,400 m 1,500 m
Sunrise: 07:00
Sunset: 19:18
Moon phase: New

Weather

A dull start with outbreaks of light rain or drizzle possible, cloud shrouding many of the higher tops. The rain will become persistent and heavier through the morning, with gusty southerly winds. It will ease through the afternoon with cloud breaking to give some drier and brighter weather with some sunny spells possible. Winds will then ease and move round to the northwest during the afternoon. A few mainly light showers are then likely during the evening.

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

Less than 10% at first as cloud affects all areas, with bases down to 300 metres widely. Bases lifting to around 600 metres, especially over northern upslopes through the morning, but still with a 10% chance below 800 metres. Quickly rising to 90% during the afternoon, as the rain eases and the cloud breaks, although some isolated shower clouds could affect tops above 700 metres at times.

Visibility

Poor or very poor at first as the heavy rain perhaps obscures nearby hills. Rising to good or very good in the northwesterly winds, occasionally falling to moderate in some showers.

Meteorologist's view

It will feel chilly in driving rain and strong winds.

Ground conditions

No adverse ground conditions reported on 20 of Sep

Friday 22 September 2017

Sunrise: 07:01
Sunset: 19:16
Moon phase: New

Weather

A dry and bright start, but it will become increasingly cloudy, with rain pushing east through the late morning, along with gale force winds. The rain could turn heavier for a time, but should ease through the afternoon as cloud starts to break. Winds will also ease later in the day.

Temperature

  • At 800m Plus 9 Celsius.
  • Valley Plus 12 rising to plus 17 Celsius.
  • Freezing level Above the summits.

Visibility

Good or very good, but falling to moderate or poor in the rain, making even near ridges difficult to see. Generally improving to good as the rain clears.

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

90% at first, but falling to 10% by early afternoon as the heavier rain arrives bringing bases down to 400 metres in places. Rising to 80% again as the rain clears, although some patchy cloud could continue to affect tops above 600 metres.

Maximum wind speed expected

Southerly 60mph.

Saturday 23 September 2017

Sunrise: 07:03
Sunset: 19:13
Moon phase: New

Mainly dry with bright or sunny spells once early cloud breaks. A strong southerly wind will persist throughout the day.

Sunday 24 September 2017

Sunrise: 07:05
Sunset: 19:11
Moon phase: New

Variable, often large amounts of cloud through the day. Rain, mainly light and patchy, will develop through the afternoon.

Monday 25 September 2017

Sunrise: 07:07
Sunset: 19:09
Moon phase: Waxing crescent

Breezy with outbreaks of rain which could turn heavy at times.

Issued at:
Close window

The Snowdonia mountains are made up of 90 mountain peaks including the tallest mountain in Wales, Snowdon, standing at 1,085 metres.

The region can be divided into four areas with the northernmost area the most popular, including peaks such as Moel Hebog, Mynydd Mawr and the Nantlle Ridge. Many hikers tend to concentrate on Snowdon itself regarding it as a fine mountain. However it can become quite crowded, with the peak welcoming around half a million visitors every year, of which four fifths scale the peak on foot, while the remainder choose to take the train instead.

One of Snowdon’s main attractions is the sheer number and variety of paths that reach the peak. This means that everyone from mountaineering novices to climbing experts should find a way up the mountain that will suit their abilities or provide them with a sufficient test. The easiest is the Llanberis path which, being the longest, has the most shallow ascent. In contrast, the Watkin Path is widely seen as being the most demanding ascent, despite also being considered the prettiest.

Follow us on

Facebook, Twitter, YouTube, Instagram, or Snapchat Facebook Follow @metoffice on Twitter YouTube Instagram Snapchat