Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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 and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Very warm
Warm conditions across the hills, rising above 15C on tops. Increasingly hot on lower terrain, reaching 25C+ in many valleys. Beware of dehydration.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Click an icon for more information or click here for a key to all icons.
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 and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Very warm
Warm conditions across the hills, rising above 15C on tops. Increasingly hot on lower terrain, reaching 25C+ in many valleys. Beware of dehydration.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 22nd June 2026
Last updated
Sun 21st Jun 26 at
2:22PM
Summary for all mountain areas
Although high pressure will dominate - bringing high temperatures and sunshine to Wales and most of England, in the far north and across Scotland, high level cloud may bring rain for an hour or two, this leading to formation of low cloud that may be very slow to lift.
Headline for Eryri / Snowdonia National Park
Light wind; chance of a little rain. Sunshine; very warm and humid.
How windy? (On the summits)
South to southeasterly between 10mph.
Effect of the wind on you?
Mostly negligible
How Wet?
Risk of the odd shower but extensively dry
Here and there a burst of rain.
Cloud on the hills?
Very little for most of the day - may form in rain.
Generally the hills free of cloud although fog possible temporarily on higher slopes in rain.
Chance of cloud free summits?
Greater than 90%
Sunshine and air clarity?
Extensive sunshine. Visibility good, although a haze.
How Cold? (at 900m)
17 rising to 20C - very warm and also very humid indeed.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 23rd June 2026
Last updated
Sun 21st Jun 26 at
2:22PM
How windy? (On the summits)
Southwesterly 15mph or less.
Effect of the wind on you?
Negligible
How Wet?
Rain very unlikely
Cloud on the hills?
Little if any
Chance of cloud free summits?
Soon almost certain
Sunshine and air clarity?
Sunshine extensive, sometimes weak due to thin high level cloud. Good visibility although hazy.
How Cold? (at 900m)
18C rising to a very warm (and exceptionally humid) 21C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 24th June 2026
Last updated
Sun 21st Jun 26 at
2:22PM
How windy? (On the summits)
Direction may well vary, 10mph or less.
Effect of the wind on you?
Negligible
How Wet?
Rain not expected
Cloud on the hills?
Little if any
Risk fog lowest coastal slopes/cliffs at times. The hills fog free.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Extensive sunshine. Persistent haze.
How Cold? (at 900m)
21C rising toward an exceptionally hot 22 to perhaps 26C.
Freezing Level
Above the summits.
Planning Outlook
A few days of often sunny and very warm weather. Some doubt remains about daytime temperatures - these possibly exceptionally hot on Wednesday (England and Wales) and Thursday (everywhere). The range in mountain temperatures given on Wednesday's forecasts reflects the uncertainty. Gradually less hot Friday and into the weekend; the change accompanied by thunderstorms in some areas.