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Eryri / Snowdonia National Park Forecast

Eryri / Snowdonia National Park

Includes all summits in the the northern half of Wales from Pumlumon northwards.

Today's Forecast

Light wind, negligible impact
Dry and sunny
Clear
Very warm
Strong warm sunshine

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Click here to download the latest PDF Last Updated Thu 10th Jul 25 at 4:08PM Last Updated Thu 10th Jul 25 at 4:08PM
View our low-graphics version Last Updated Thu 10th Jul 25 at 4:08PM Last Updated Thu 10th Jul 25 at 4:08PM

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.