Mountain weather

Snowdonia Mountain weather forecast table

Confidence

High for an unsettled period. Moderate for exact detail of showers on each day.

Sunrise:
Sunset:

This evening forecast

Showers easing somewhat through the evening, allowing for some clear spells, but cloud then increasing again in the final few hours of the day. Blustery throughout.

Sunrise:
Sunset:
Mountain hazards

Mountain weather hazards

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

hazard Gales
Gale force winds (gusts over 50mph) make walking difficult and strenuous with a potential to be blown over by gusts. There is often a marked increase in winds through cols or on exposed ridges and summits. Distances can take longer to cover and compass bearings become harder to follow accurately.

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 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 Severe Chill Effect
Wind significantly lowers the ‘feels-like’ temperature relative to the actual temperature, with even moderate winds significantly adding to the chilling effect. Strong winds can result in a severe and debilitating wind chill many degrees below the actual temperature. This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia.
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 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

Cloudy with showers and longer spells of rain.

00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
Weather
(at 800m)
Light rain Cloudy Light rain Heavy rain Light shower (day) Heavy shower (day) Cloudy Light shower (day)
Chance of precipitation
(at 800m)
60% 30% 40% 70% 60% 60% 40% 40%

Wind direction and speed (mph)
Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m S
43
S
43
S
43
S
44
S
44
S
40
SW
38
SW
31
600m S
32
S
32
S
34
S
34
S
35
S
31
S
29
SW
23
300m S
22
S
21
S
23
S
22
S
24
S
22
S
21
SW
16
Valley S
22
S
22
S
23
S
22
S
24
S
21
S
20
SW
16
Wind gust (mph)
Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m 53 54 55 57 58 54 51 41
600m 42 42 45 46 48 44 42 33
300m 37 37 40 40 43 39 37 30
Valley 37 37 40 39 41 38 35 30

Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
600m
300m
10°
10°
10°
11°
11°
11°
11°
11°
Valley
11°
11°
12°
12°
13°
13°
13°
12°
Freezing Level
1,700m
1,800m
1,800m
1,900m
1,900m
1,900m
2,000m
2,000m

Altitude above mean sea level
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
900m
-2°
-1°
-1°
600m
300m
Valley
10°
10°

Additional weather information

Meteorologist's view

Winds will be strong all day, with gales over the summits. Be sure to wear appropriate footwear with good grip in addition to waterproofs.

Weather

A rather cloudy day with showers and longer periods of rain occurring throughout, heavy at times. The low risk of an isolated shower also being thundery.

Chance of cloud-free hill tops

60% for most of the day, dropping to 40% in the evening.

Low cloud and visibility

Widespread cloud predominantly around 800-900m but occasionally lowering to 400-500m, increasingly so through the evening, shrouding the higher routes. Visibility also frequently dropping to poor at lower levels as a result of the rain and showers.

Ground conditions

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

Sunrise:
Sunset:

Mountain weather information

Weather

Damp and cloudy to begin the day with showers, potentially heavy and merging to form longer spells of rain. Showers easing from mid-morning and then turning largely dry for the afternoon with sunny spells. Staying dry into the evening, though with some higher-based cloud perhaps beginning to arrive.

Chance of cloud-free hill tops

30% to begin, rising to 90% from late morning onwards.

Maximum wind speed expected

20mph southwesterly winds on the hills.

Temperature

  • At 800m Plus 4 Celsius, rising to plus 6 Celsius.
  • Valley Plus 10 Celsius, rising to plus 18 Celsius.
  • Freezing level Above the summits.

Low cloud and visibility

Cloud covering slopes above 400m through the first half of the morning with poor visibility also as a result of the passing showers. Cloud then rising to above the summits for late morning onwards and visibility improving to allow very good views of distant hills.

Mountain weather information

Tue 28 Jun

Sunrise:
Sunset:

Cloud arriving through the morning with accompanying outbreaks of rain, heavy at times, continuing through the day. Unseasonably windy with strong and gusty southerly winds. Freezing level well above the summits.

Wed 29 Jun

Sunrise:
Sunset:

Rain turning patchier through the day, still with some heavy bursts at times. Generally cloudy in between any precipitation to begin but with some bright or sunny spells developing later. Winds easing to moderate southerlies. Freezing level remaining above the summits.

Thu 30 Jun

Sunrise:
Sunset:

Fewer showers around compared to recent days, allowing for a largely dry day with sunny spells. Gentle southwesterly winds and the freezing level above the summits.

Updated at:

Summit specific forecast

Mountain summit forecast map

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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.