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.
Thunderstorm
Heavy or torrential downpours with hail, risk of thunder and lightning. Seek shelter where possible.
Clear
Excellent or superb visibility, no navigation issues.
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.
Thunderstorm
Heavy or torrential downpours with hail, risk of thunder and lightning. Seek shelter where possible.
Clear
Excellent or superb visibility, no navigation issues.
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
Tuesday 21st May 2024
Last updated
Tue 21st May 24 at
7:25AM
Summary for all mountain areas
Extensively dry with light wind. However, as cloud builds sunshine will tend to give way from southeast and here and there bursts of rain are likely. It will be warm, particularly on summits near the west coast, where scattered thunderstorms giving localised torrential rain.
Headline for Eryri / Snowdonia National Park
Extensive sunshine morning. Risk thunderstorm afternoon.
How windy? (On the summits)
Direction varied, 10mph or less - virtually calm on some summits.
Effect of the wind on you?
Negligible
How Wet?
Thunderstorms afternoon
One or two brief bursts of rain, mostly afternoon onwards. From early or mid afternoon, scattered thunderstorms will give heavy or torrential rain.
Cloud on the hills?
Little if any
Summits all or almost all constantly cloud free. Nevertheless, fog likely to form on both lower and higher slopes in and after rain.
Chance of cloud free summits?
Almost certain
Sunshine and air clarity?
Often sunny morning, but increasingly high cloud layers then weakening the sun. Visibility mostly excellent.
How Cold? (at 900m)
8C at dawn, lifting to 14C by mid afternoon.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 22nd May 2024
Last updated
Tue 21st May 24 at
7:25AM
How windy? (On the summits)
Northerly, gradually strengthening from 15mph after dawn, to 25 or 30mph evening.
Effect of the wind on you?
As wind strengthens will increasingly impede ease of walking on higher areas and wind chill will become considerable.
How Wet?
Intermittent rain.
Confidence low: Bursts of heavy rain and possibly thunderstorms developing through morning. The rain may become widespread, particularly east Wales.
Cloud on the hills?
Increasingly extensive
Considerable variation both through the day and sometimes between adjacent summits. Deteriorating where raining: quite widely cloud forming on lower slopes. However, even in morning, patches of fog from some lower slopes up.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Little or no sunshine. Hazy, and visibility deteriorating markedly as rain develops.
How Cold? (at 900m)
8C
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 23rd May 2024
Last updated
Tue 21st May 24 at
7:25AM
How windy? (On the summits)
Low confidence in forecast: Northwesterly between 15 and 25mph.
Effect of the wind on you?
Mostly fairly small.
How Wet?
Rain clearing; then risk showers
A broad swath of rain may have enveloped particularly NE Wales overnight and take several hours to clear after dawn. Otherwise, extensively dry, although risk of one or two showers.
Cloud on the hills?
Very extensive, although cloud base rising from west
Cloud may blanket the mountains widely from dawn. As rain eases, so cloud base will rise, by afternoon mostly above 750 to 900m and may eventually clear completely.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Cloud thinning to give patches of sun, most widely on summits near the coast. Poor visibility in rain but becoming very good.
How Cold? (at 900m)
Between 3 and 6C
Freezing Level
Above the summits.
Planning Outlook
Low confidence on Wednesday and particularly Thursday. On Wednesday areas of thundery rain become increasingly widespread, although most or perhaps all of Wales will escape. By Thursday, there is uncertainty in positioning a north to south band of rain. It is most likely to be centred over eastern Britain, but edge away east only slowly. Beyond, after dry weather into the weekend, southerly winds will strengthen ahead of rain coming in off the Atlantic (again timing of this uncertain).