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 and sunny
Extensive strong warm sunshine. The mountains free of cloud once any early mist patches disperse.
Clear
Excellent or superb visibility, no navigation issues.
Very warm
Warm conditions across the hills, rising above 17C 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 strong warm sunshine. The mountains free of cloud once any early mist patches disperse.
Clear
Excellent or superb visibility, no navigation issues.
Very warm
Warm conditions across the hills, rising above 17C 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
Friday 11th July 2025
Last updated
Thu 10th Jul 25 at
4:08PM
Summary for all mountain areas
Sunny and very warm across most areas with light or negligible wind - beware risk of sunburn and dehydration. Warm temperatures will persist overnight. Temperatures nearer the middle teens on Scotland's west coast in the breeze, some early patchy cloud onto Skye and coastal slopes to the south.
Headline for Eryri / Snowdonia National Park
Sunny and very warm, staying warm into night
How windy? (On the summits)
Light winds with variable direction. Generally southwesterly in the morning, always 10mph or less.
Effect of the wind on you?
Negligible.
How Wet?
No rain
Cloud on the hills?
Little or no cloud
An odd patch of cloud may drift onto low southwest slopes at dawn, soon dissipating for cloud-free summits.
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Widespread sunshine; beware sunburn and dehydration. Excellent visibility; some haze eastern Cymru/Wales.
How Cold? (at 900m)
17 to 19C, little change through the day. Warmest in the Berwyn Mountains where it may reach 22C.
Freezing Level
Well above the summits. (Remaining warm on high ground overnight.)
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 12th July 2025
Last updated
Thu 10th Jul 25 at
4:08PM
How windy? (On the summits)
Southeasterly 15mph or less, often light and variable. Rising towards 20mph into nighttime.
Effect of the wind on you?
Small or negligible.
How Wet?
Very likely dry
Remote risk of isolated thunderstorms in the late afternoon or early evening. Otherwise, dry all day.
Cloud on the hills?
Cloud not expected
Chance of cloud free summits?
Almost certain
Sunshine and air clarity?
Widespread strong sunshine; beware sunburn, dehydration and heatstroke. Low level haze, but excellent visibility on high ground.
How Cold? (at 900m)
20C at dawn, rising a degree or two. Remaining warm overnight.
Freezing Level
Well above the summits. (Valley temperatures approaching 28 to 30C in the afternoon, hottest east Wales.)
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 13th July 2025
Last updated
Thu 10th Jul 25 at
4:08PM
How windy? (On the summits)
Southeasterly with some variability, 15-20mph. Breezes occasionally reaching 25mph, notably early in the day.
Effect of the wind on you?
Fairly small, occasional uncomfortable breezes; some buffeting gusts early.
How Wet?
Substantially dry
Few local spots of light rain later in the day, otherwise dry.
Cloud on the hills?
Any cloud unlikely
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
A widely sunny morning, patchy cloud building and increasingly blocking sun. Excellent visibility.
How Cold? (at 900m)
17 or 18C, only a slight warming if any.
Freezing Level
Above the summits
Planning Outlook
Very warm or hot conditions this weekend in the mountains and the valleys, with extreme risk of wildfire in Scotland; beware dehydration and sunburn. Light winds and very little cloud. Low pressure returns late Sunday into Monday bringing rain to most, risk heavy or thunderstorms north England and Scotland. Temperatures will cool towards average and often raining for the first half of the week. Becoming more mixed from mid-week as pressure goes slack and Atlantic fronts make only weak pushes from the west. Patchy rain and cloud will come and go with the best opportunities for sun in north and western areas.