Eryri / Snowdonia

This evening forecast

A rather cloudy, mostly dry start to this evening. Cloud thickening to bring some patchy drizzle and turning misty over the hill tops, where also a little breezy.

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.

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.

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.

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.

Mountain weather forecast

Mist and patchy rain giving way to heavy showers, with possible thunder. A drier evening with fog patches.

Time	Time	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00
Weather (at 800m)	Weather symbols
Chance of precipitation (at 800m)	Chance of precipitation	50%	50%	40%	70%	90%	50%	30%	10%

Wind direction and speed

Altitude above mean sea level

Time	Time	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00
900m	900m	S 19mph knots S 19mph	S 21mph knots S 21mph	S 23mph knots S 23mph	S 24mph knots S 24mph	SW 24mph knots SW 24mph	SW 21mph knots SW 21mph	SW 16mph knots SW 16mph	SW 14mph knots SW 14mph
600m	600m	S 14mph knots S 14mph	S 15mph knots S 15mph	S 18mph knots S 18mph	S 18mph knots S 18mph	SW 19mph knots SW 19mph	SW 18mph knots SW 18mph	SW 13mph knots SW 13mph	SW 9mph knots SW 9mph
300m	300m	S 9mph knots S 9mph	S 10mph knots S 10mph	S 13mph knots S 13mph	S 13mph knots S 13mph	S 15mph knots S 15mph	SW 14mph knots SW 14mph	SW 10mph knots SW 10mph	SW 6mph knots SW 6mph
Valley	Valley	S 8mph knots S 8mph	S 9mph knots S 9mph	S 11mph knots S 11mph	S 13mph knots S 13mph	S 15mph knots S 15mph	SW 13mph knots SW 13mph	SW 10mph knots SW 10mph	SW 6mph knots SW 6mph

Wind gust

Altitude above mean sea level

Time	Time	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00
900m	900m	24mph	28mph	31mph	33mph	34mph	31mph	23mph	18mph
600m	600m	20mph	22mph	25mph	27mph	29mph	27mph	20mph	13mph
300m	300m	17mph	20mph	23mph	25mph	26mph	25mph	18mph	12mph
Valley	Valley	15mph	17mph	20mph	25mph	26mph	23mph	18mph	13mph

Altitude above mean sea level

Time	Time	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00
900m	900m	8 degrees Celsius	8 degrees Celsius	8 degrees Celsius	9 degrees Celsius	10 degrees Celsius	10 degrees Celsius	10 degrees Celsius	10 degrees Celsius
600m	600m	10 degrees Celsius	10 degrees Celsius	10 degrees Celsius	11 degrees Celsius	12 degrees Celsius	12 degrees Celsius	12 degrees Celsius	12 degrees Celsius
300m	300m	12 degrees Celsius	12 degrees Celsius	13 degrees Celsius	14 degrees Celsius	15 degrees Celsius	15 degrees Celsius	15 degrees Celsius	14 degrees Celsius
Valley	Valley	14 degrees Celsius	14 degrees Celsius	15 degrees Celsius	16 degrees Celsius	17 degrees Celsius	17 degrees Celsius	17 degrees Celsius	15 degrees Celsius
Freezing Level	Freezing Level	2300m	2700m	2500m	2500m	2500m	2400m	2500m	2600m

Altitude above mean sea level

Time	Time	00:00	03:00	06:00	09:00	12:00	15:00	18:00	21:00
900m	900m	5 degrees Celsius	4 degrees Celsius	4 degrees Celsius	5 degrees Celsius	6 degrees Celsius	6 degrees Celsius	7 degrees Celsius	7 degrees Celsius
600m	600m	8 degrees Celsius	7 degrees Celsius	7 degrees Celsius	8 degrees Celsius	9 degrees Celsius	9 degrees Celsius	10 degrees Celsius	10 degrees Celsius
300m	300m	11 degrees Celsius	10 degrees Celsius	11 degrees Celsius	11 degrees Celsius	12 degrees Celsius	13 degrees Celsius	13 degrees Celsius	13 degrees Celsius
Valley	Valley	13 degrees Celsius	13 degrees Celsius	13 degrees Celsius	13 degrees Celsius	14 degrees Celsius	15 degrees Celsius	16 degrees Celsius	15 degrees Celsius
Freezing Level	Freezing Level	2300m	2700m	2500m	2500m	2500m	2400m	2500m	2600m

Additional weather information

Meteorologist's view

Misty conditions at first, and fog patches during the evening are likely to give some difficult navigating conditions. There is a small risk of thunder and briefly gusty winds, accompanying the daytime showers. If the sun comes out in the afternoon UV levels are likely to be high.

Weather

Mostly cloudy with some drizzle and mist patches at first. Showery rain developing from the west during the morning. Some heavy bursts possible around the middle of the day, with the chance of thunder. Showers easing from mid afternoon with some brighter breaks, then mostly dry in the evening with clear intervals, though some mist and fog patches also forming. Brisk south to southwesterly winds until the evening near the summits and heavy showers could give some brief gusty conditions elsewhere too during the day.

Chance of cloud-free hill tops

30% at first and as heavy showers develop during the morning/early afternoon. Increasing to around 70% mid to late afternoon, then dropping to 30% or less in the evening as fog patches form.

Low cloud and visibility

Low cloud, mist and drizzle giving some poor visibility at first especially near the summits. Moderate to poor visibility in heavy showers during the day, then improving moderate in brighter breaks later. Poor or very poor visibility in fog patches during the evening.

Ground conditions

Please see - https://yrwyddfa.live/

Mountain weather information

Weather

Low cloud with fog patches and some drizzle at first. Cloud lifting and breaking during the morning to give some bright or sunny spells, and dry throughout the afternoon. Rain arriving overnight, accompanied by fog on the hills. Breezy near the summits, and winds generally strengthening overnight.

Chance of cloud-free hill tops

20% or less at first, increasing to 70% or more for a time in the afternoon, then lowering to 30% or less in the evening.

Maximum wind speed expected

West to northwest 15 to 20mph, gusts 20 to 25mph, turning south to southwest during the afternoon and for the evening and increasing to 35, occasionally 40mph, with gusts to around 45mph.

Temperature

At 800m PS 09C rising to PS 12C.
Valley PS 13C rising to PS 20C
Freezing level Above summits throughout.

Low cloud and visibility

Low cloud giving fog patches and very poor visibility at first, especially on hills above about 400 metres. Visibility improving to moderate or good in afternoon sunshine, then deteriorating to poor in the evening, especially above 300 or 400 metres.

Ground conditions

No recent ground conditions report available.

Mountain weather information

Thu 2 Jul

Sunrise: 04:54

Sunset: 21:45

Rain and brisk winds at first clearing to leave a mostly fine, but still breezy day with plenty of sunshine. Freezing levels above summits throughout.

Fri 3 Jul

Sunrise: 04:55

Sunset: 21:45

Dry with early low cloud clearing to leave some sunshine. Breezy near the summits. Freezing levels above the summits throughout.

Sat 4 Jul

Sunrise: 04:56

Sunset: 21:44

Mostly dry but fairly cloudy, and breezy near the summits. Freezing levels above the summits throughout.

Mountain weather

Eryri / Snowdonia

Confidence

This evening forecast

Mountain weather hazards

Poor Visibility

Strong Sunlight

Thunderstorms

Heavy Persistent Rain

Mountain weather forecast

Wind direction and speed

Wind gust

Additional weather information

Meteorologist's view

Weather

Chance of cloud-free hill tops

Low cloud and visibility

Ground conditions

Mountain weather information

Weather

Chance of cloud-free hill tops

Maximum wind speed expected

Temperature

Low cloud and visibility

Ground conditions

Mountain weather information

Thu 2 Jul

Fri 3 Jul

Sat 4 Jul

Summit specific forecast

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Mountain weather

Eryri / Snowdonia

Confidence

This evening forecast

Mountain weather hazards

High likelihood: 2 weather hazards

Poor Visibility

Strong Sunlight

Medium likelihood: 2 weather hazards

Thunderstorms

Heavy Persistent Rain

Mountain weather forecast

Wind

Wind direction and speed

Wind gust

Temperature

Feels Like Temperature

Additional weather information

Meteorologist's view

Weather

Chance of cloud-free hill tops

Low cloud and visibility

Ground conditions

Mountain weather information

Weather

Chance of cloud-free hill tops

Maximum wind speed expected

Temperature

Low cloud and visibility

Ground conditions

Mountain weather information

Thu 2 Jul

Fri 3 Jul

Sat 4 Jul

Summit specific forecast

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