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.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
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.
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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.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
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.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 15th August 2025
Last updated
Fri 15th Aug 25 at
7:30AM
Summary for all mountain areas
Continuing fairly humid. Extensive low cloud and patchy drizzly rain N Scotland; but elsewhere extensively dry with areas of very low cloud gradually clearing to give sunshine. Blustery far north and northeast Scotland, elsewhere light wind.
Headline for Eryri / Snowdonia National Park
Little wind. Fine, periods of sunshine, after patchy fog at first.
How windy? (On the summits)
Northerly, 10mph or less.
Effect of the wind on you?
Negligible
How Wet?
Rain not expected
Cloud on the hills?
Little if any by afternoon
Low confidence morning; ribbons of fog in and above some valleys, whilst some or most higher areas are above the fog. By late morning, all terrain more or less free of cloud.
Chance of cloud free summits?
90% from midday
Sunshine and air clarity?
Sunshine increasingly breaking through morning and middle of day. Fog clearing to excellent visibility.
How Cold? (at 900m)
12C rising to 17C (but 14C near Tryfan and Carneddau).
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 16th August 2025
Last updated
Fri 15th Aug 25 at
7:30AM
How windy? (On the summits)
East or southeasterly 15mph, perhaps locally 20mph.
Effect of the wind on you?
Mostly negligible
How Wet?
Rain very unlikely
Cloud on the hills?
Summits widely cloud free after patchy fog eastern slopes at first
After dawn, ribbons of fog some valleys and lower slopes east Wales; little if any elsewhere. The fog will clear by late morning.
Chance of cloud free summits?
Almost certain by mid or late morning
Sunshine and air clarity?
Extensive bright sunshine and excellent or superb visibility as fog (mainly east Wales) clears through the morning.
How Cold? (at 900m)
Around 14C after dawn; and 19C mid afternoons.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 17th August 2025
Last updated
Fri 15th Aug 25 at
7:30AM
How windy? (On the summits)
East or southeasterly 10 to 15mph, but a gusty 20, possibly 25mph west Wales - where perhaps strongest lower slopes.
Effect of the wind on you?
Mostly small
How Wet?
Rain not expected
Cloud on the hills?
Little if any
Fog a few lower slopes and valleys after dawn will all clear.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Extensive or unbroken bright sunshine. Superb visibility after fog some valleys at first.
How Cold? (at 900m)
13C post dawn; as high as 19C mid to late afternoon.
Freezing Level
Above the summits.
Planning Outlook
High pressure, generally centred near northern Britain, will persist well into next week. Extensively dry, warm and sunny, although sometimes low cloud will affect more eastern mountains, and into next week there is uncertainty as to the penetration of rain (including thunderstorms) into Britain from the southwest. Very dry, or becoming very dry again underfoot with significant fire risk.