Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday'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.
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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 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
Thursday 9th July 2026
Last updated
Wed 8th Jul 26 at
4:20PM
Summary for all mountain areas
Warm-to-hot sun for most, risk of sunburn and dehydration. Early sea fog on low slopes near west coasts of England and Wales, may briefly lift but soon dissipating. Varied cloud western Scottish Highlands, mostly Mull to Skye, little or none eastward; high tops in and around Lochaber above the cloud layer.
Headline for Eryri / Snowdonia National Park
Very warm sunshine, hot in valleys; early sea fog
How windy? (On the summits)
Variable direction less than 10mph; some sea breezes and upslope gusts may form.
Effect of the wind on you?
Negligible.
How Wet?
No rain expected
Cloud on the hills?
Hills clear
Coastal fog drifts onto the lowest slopes facing coasts in the morning, some patchy valley mist further inland here and there. Higher slopes clear, in places overlooking lower fog over the sea, and any inland fog soon clears too.
Chance of cloud free summits?
Nearly certain
Sunshine and air clarity?
Extensive sunshine. Visibility very good, a slight low-level haze.
How Cold? (at 900m)
15C rising to 19C afternoon; sea-breezes may moderate temperatures slightly on slopes nearest north coast. Well-inland valley temperatures approach 26C, or hotter east Wales.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 10th July 2026
Last updated
Wed 8th Jul 26 at
4:20PM
How windy? (On the summits)
Southeasterly or variable, 10-15mph or less; variable gusts forming afternoon, including upslope in lower areas.
Effect of the wind on you?
Small.
How Wet?
Rain unlikely
Late in the day, small chance of a very isolated burst of rain.
Cloud on the hills?
Hills clear
Chance of cloud free summits?
Practically certain
Sunshine and air clarity?
Strong sunshine, some thin high cloud, fair weather cloud building afternoon. Visibility good especially west, hazier east and north.
How Cold? (at 900m)
19C at dawn, rising to 23C, very warm (valleys approaching 30C) and rather humid especially in west.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 11th July 2026
Last updated
Wed 8th Jul 26 at
4:20PM
How windy? (On the summits)
Generally east-northeasterly 10-15mph, though variable and lower speeds at times.
Effect of the wind on you?
Small.
How Wet?
No rain expected
Cloud on the hills?
Hills clear
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Extensive sunshine, some thin high cloud, patchy fair weather cloud building afternoon. Very good visibility.
How Cold? (at 900m)
19 to 21C (valleys approaching 26C).
Freezing Level
Above the summits.
Planning Outlook
Staying warm in Scotland, hot for England and Wales into the weekend. High pressure shifts northward, facilitating a strengthening easterly wind across most areas. Some lingering cloud and rain over the Scottish Highlands on Friday and Saturday, some risk of heavier thundery bursts on Friday. The weekend is likely dry across England and Wales with fairly extensive sun, some sea fog beginning to affect northeastern hill groups later weekend. Easterly wind will persist next week, sometimes quite strong England and Wales. Mostly sunny and quite hot, including Scottish Highlands. Low pressure south of the country may push showers into Wales, though confidence is low. Otherwise, this hot and dry pattern is likely to persist until late next week, at least.