Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Dry, Inversion
Banks of cloud or fog on lower or middle slopes, but higher terrain likely clear and sunny above an inversion.
Warm
Comfortable temperatures on the hills, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Strong sunshine
High UV levels, beware of sunburn. Warm temperatures, rising above 20C in the valleys, beware of dehydration.
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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Dry, Inversion
Banks of cloud or fog on lower or middle slopes, but higher terrain likely clear and sunny above an inversion.
Warm
Comfortable temperatures on the hills, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Strong sunshine
High UV levels, beware of sunburn. Warm temperatures, rising above 20C in the valleys, beware of dehydration.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 19th September 2024
Last updated
Wed 18th Sep 24 at
1:24PM
Summary for all mountain areas
Dry and bright sunshine for almost all British hills. Patches of valley fog in the morning, especially near the coast, lakes or rivers. Warm, temperature rising to over 20C in most valleys. Light winds, sometimes hardly any wind. Excellent visibility, especially toward the north.
Headline for Eryri / Snowdonia National Park
Dry, sunny & warm, patches of valley fog in the morning
How windy? (On the summits)
Easterly 15 to 25mph, at times less or even lull.
Effect of the wind on you?
Fairly small, although local sudden gusts both on higher and some lower slopes.
How Wet?
Rain not expected
Cloud on the hills?
Very little if any
Fog shrouding lower slopes below or well below 450m, manly east Wales. Will disperse latest middle of day.
Chance of cloud free summits?
Almost certain
Sunshine and air clarity?
Extensive or unbroken bright sunshine. Ribbons of fog some valleys and lower slopes east Wales, mainly morning. Very good visibility above the layer of fog or low cloud.
How Cold? (at 900m)
14C
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 20th September 2024
Last updated
Wed 18th Sep 24 at
1:24PM
How windy? (On the summits)
Easterly 20 or 25mph.
Effect of the wind on you?
Fairly small
How Wet?
Risk of a little rain
Risk low, but there may be one or two periods of showery rain toward the evening toward the south - possibly a heavy burst with very low risk an isolated thunder. First half of the day surely dry.
Cloud on the hills?
Increasingly widespread
Higher, particularly western & northern mountains may well be cloud free all day. Lower down, cloud between 200m and 600-700m (top of the cloud) extensive east Wales, more broken west. This may extend to higher slopes late in the day.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Patches of sunshine, mainly west Wales. Hazy, particularly east Wales.
How Cold? (at 900m)
15C, but very much colder, perhaps only 7C, where in cloud.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 21st September 2024
Last updated
Wed 18th Sep 24 at
1:24PM
How windy? (On the summits)
East to northeasterly, 15 to 20mph.
Effect of the wind on you?
Small.
How Wet?
Chance brief shower southeast.
Rain unlikely in Snowdonia, but chance for showers on the hills, highest east of the river Conwy, especially toward the south. Here risk an isolated thunder.
Cloud on the hills?
Hills covered at times on various levels
Thick valley fog in the morning below 500m. During the day fog slowly dispersing, but afternoon cloud possibly coming and going on various higher levels.
Chance of cloud free summits?
60%, tops in the morning cloud-free
Sunshine and air clarity?
Patchwork of sun, clouds most frequently in the east and southeast. Moderate/good viisbility, haze in the air.
How Cold? (at 900m)
11 to 13C
Freezing Level
Above the summits.
Planning Outlook
High pressure conditions with a lot of sunshine, warm temperatures and calm winds will continue until early next week in Scotland and northern England. In Wales and Peak District from Friday onward mix of sun and clouds, with locally heavy showery bursts of rain, possibly isolated thunder. Beginning of next week showers possible also northern England and parts of Scotland, although Highlands still mostly dry and sunny until mid next week. Then, weather conditions may deteriorate across all British mountains with cooling and strong winds, although further development uncertain.