Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday'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.
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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.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 17th July 2026
Last updated
Thu 16th Jul 26 at
4:24PM
Summary for all mountain areas
Dry conditions persist with high wildfire risk; some areas inaccessible due to fire hazards. Dawn sea fog over north/east Scotland and eastern Pennines largely clears, occasional patchy hill cloud drifts into north Scotland. Warm with sun and high cloud western areas, most hills cloud-free.
Headline for Eryri / Snowdonia National Park
Very warm; most extensive sun likely later in the day
How windy? (On the summits)
North to northeasterly 10 to 15mph, occasionally approaching 20mph over tops in Snowdon/Yr Wyddfa area and on Llyn peninsula.
Effect of the wind on you?
Mostly small.
How Wet?
No rain expected
Cloud on the hills?
Hills clear
Remote chance of an odd patch of cloud drifting onto northern slopes late in the day, but more likely entirely clear during daylight.
Chance of cloud free summits?
Practically certain
Sunshine and air clarity?
Mostly sunny but weakened by high cloud for periods, perhaps sunnier later. Visibility good though a slight haze.
How Cold? (at 900m)
15 to 16C most of the day, may rise a few degrees over Berwyn group.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 18th July 2026
Last updated
Thu 16th Jul 26 at
4:24PM
How windy? (On the summits)
Northerly, some variability, 10-20mph, gusty early. Later, trending northeasterly and strengthening.
Effect of the wind on you?
Fairly small, some nuisance gusts, and walking increasingly inconvenienced into evening.
How Wet?
Rising chance of showers
Largely dry well into the day, a rising chance of showers through afternoon, risk of local heavy bursts. The showers will trend southward, Eryri/Snowdonia NP perhaps entirely dry.
Cloud on the hills?
Little expected
Patchy mist on middle and low slopes early, this lifting and mostly dissipating soon after dawn. A few banks may occasionally drift over high northern terrain but otherwise clear.
Chance of cloud free summits?
90%
Sunshine and air clarity?
A patchwork of cloud and sunshine. A light haze tends to fade, visibility becomes good.
How Cold? (at 900m)
12 to 14C, coolest Carneddau to Llanberis where little or no rise in temperature; valleys rising to 20C or warmer.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 19th July 2026
Last updated
Thu 16th Jul 26 at
4:24PM
How windy? (On the summits)
Northerly 5-15mph, more northeasterly in the early hours.
Effect of the wind on you?
Mostly small.
How Wet?
Likely dry
Small chance of a few sprinkles on slopes near coasts in the afternoon, more likely entirely dry.
Cloud on the hills?
Hills clear
Chance some light mist in sheltered areas in the morning, this soon fading for clear hills
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Often sunny, some thin high cloud and fair weather cloud developing. Excellent visibility.
How Cold? (at 900m)
10C rising to 13C Eryri/Snowdonia NP, least rise north slopes; a degree or two milder to the south and east.
Freezing Level
Above the summits.
Planning Outlook
Settled summer weather continues through the weekend and next week as high pressure dominates. Extremely dry ground conditions persist with a high risk of wildfire. Temperatures will trend cooler, dropping below 10C on summits overnight in Scotland, but afternoon temperatures rising to warm or very warm; most persistently cooler in the far north where some cloud will be drawn onto high terrain and over tops at times with occasional light showery rain; high summits of the Scottish Highlands sometimes above a morning cloud inversion. Otherwise generally ongoing dry weather, with good amounts of sun and hill tops often clear of cloud. A change of weather pattern indicated late in the month brings scope for rain and thundery showers.