Mountain weather

There may be weather warnings in force for the UK

Snowdonia Mountain weather forecast table

Confidence

High for the generally unsettled theme, falling to moderate for the exact passage of the rain and showers Friday.

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Mountain hazards

Mountain weather hazards

Hazards apply at or above 300m, reflecting the more severe conditions which can occur at altitude.

hazard Poor visibility
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.

hazard Thunderstorms
Lightning is a significant mountain hazard which can result in serious injury or death. Mountain terrain often leaves one highly exposed to lightning strikes. Hail may give unpleasant conditions with torrential rain and localised flash flooding also possible, mainly in Summer months.
hazard Heavy persistent rain
Heavy and persistent rain can lead to drenched clothing and footwear with waterproofs often becoming soaked through, especially if accompanied by strong winds. This can lead to significant loss of body heat and an increased likelihood of hypothermia. Terrain may turn increasingly boggy underfoot while streams can flood and 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.
hazard Strong sunlight
Harmful UV levels from sunlight increase with altitude giving a greater risk of sunburn and eye damage, even on some overcast days. On breezy days, the cooling effect of wind on exposed skin may disguise any feeling of sunburn until it is too late. If there is snow cover, glare increases the effect of UV rays especially on the eyes. It is advisable to wear sun block, protective clothing such as a long-sleeved top and hat and have good quality eye protection.

Mountain weather forecast

Heavy rain at first, cloudy with frequent showers, locally heavy and with a risk of thunder later.

Wind direction and speed (mph)
Altitude above mean sea level
Wind gust (mph)
Altitude above mean sea level

Altitude above mean sea level

Altitude above mean sea level

Additional weather information

Meteorologist's view

Some very poor conditions at first, with rain and cloud on hills. Some improvement through the afternoon, however showers are possible, leading to further transient periods of poor conditions, especially on the tops. Whilst lightning is unlikely, it cannot be completely ruled out, so it will be good to be prepared to change plans if thunderstorms develop.

Weather

Cloudy with morning rain, locally heavy, clearing. Remaining cloudy into the early afternoon, however cloud tending to break up a little allowing some brighter spells later in the day, but also sparking a few showers. Whilst unlikely, the odd rumble of thunder cannot be completely ruled out.

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

20% rising to 60% from early afternoon.

Visibility

Cloud obscuring hills above 500m, particularly during the morning, with the odd patch down to 300m in places and obscuring views from the tops. Views also limited at lower levels with rain leading to only moderate visibility. As cloud lifts and breaks a little during the afternoon visibilities will improve a little but some of the higher summits remaining in cloud throughout, mainly above 800m. Further reductions to poor likely during any heavy showers.

Ground conditions

Please see - https://www.eryri.llyw.cymru/visiting/walking/ground-conditions

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Sunset:

Mountain weather information

Weather

Overcast before the cloud breaks up a little during the morning allowing some brighter spells from mid-morning. Showers are likely to develop during the afternoon, some of these could prove rather heavy. Showers tending to ease from late afternoon with clear spells developing.

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

20% rising to 80% from mid-morning

Maximum wind speed expected

Westerly 15-20mph

Temperature

  • At 800m Plus 8 Celsius, rising to Plus 11 Celsius.
  • Valley Plus 11 Celsius, rising to Plus 17 Celsius.
  • Freezing level Above the summits.

Visibility

Areas of cloud obscuring tops above 400m at first, with visibilities near summits poor. Otherwise good views are likely, with visibilities improving at all levels from mid-morning. Although some cloud persisting above 700m, limiting views from the tops.

Mountain weather information

Sunday 1 August

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Sunset:

Dry initially but showers and sunny spells developing. Feeling cool with light northwesterly winds.

Monday 2 August

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Sunset:

Mainly dry, although with the chance of an Isolated shower in the afternoon. Light northeasterly wind.

Tuesday 3 August

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Sunset:

A cool start, then a very similar day to recent ones with sunny spells and a risk of the odd isolated shower. Cloud thickening late in the day with an increasing chance of rain by midnight.

Updated at:

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.