Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 19th August 2026
Last updated
Tue 18th Aug 26 at
4:27PM
Summary for all mountain areas
Slow-moving showers across Scotland, trending more frequent and heavy afternoon with thundery downpours; light wind but gusty around showers. Showers in England, most frequent and heavy early and into night in northern areas with thunder risk. Scattered showers and sun in Wales on a westerly wind.
Headline for Eryri / Snowdonia National Park
Scattered showers from the west; blustery over tops and gusty
How windy? (On the summits)
Southwesterly 20 to 30mph, some variability in speed and occasionally rising towards 35mph over the highest summits.
Effect of the wind on you?
Breezy over high terrain, affecting comfortable walking at times, risk buffeting more often later; feeling rather cool.
How Wet?
Showers
Showery rain most frequent in western areas in the morning, but scattered bursts of rain passing eastwards during the day. A drier window is probable afternoon, but later in day, risk of more prolonged rain developing in the west.
Cloud on the hills?
Lifting towards the tops, any breaks only brief
Covering many western tops above 600-800m in the morning; base tending to rise, breaks forming toward upper slopes. Breaks off tops unlikely, and only brief if they do occur.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Sun mostly east in the morning, otherwise often cloudy; some sun later near coast. Visibility mostly good.
How Cold? (at 900m)
7 to 9C, coolest west, little change all day. Feeling near freezing directly in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 20th August 2026
Last updated
Tue 18th Aug 26 at
4:27PM
How windy? (On the summits)
Westerly turning northerly, speed likely varying 15 to 30mph, strongest later in day.
Effect of the wind on you?
Fairly small for periods, but may start to affect comfortable walking and feeling noticeably cool where exposed on tops.
How Wet?
Frequent rain, some heavy
Rain on and off much of the day, heavy bursts forming increasingly, local thundery downpours in afternoon, and at times clustering into more persistent spells of rain.
Cloud on the hills?
Fairly extensive
Often covering many hills above 600 to 800m, lowest in north and during rain. Some higher breaks may form inland, but then a period of more extensive cloud returns for several afternoon hours.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Mostly cloudy, rare sun breaking through. Visibility good at times, but poor in rain.
How Cold? (at 900m)
7 to 9C. Feeling close to freezing in stronger wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 21st August 2026
Last updated
Tue 18th Aug 26 at
4:27PM
How windy? (On the summits)
Northerly but variable, 10mph and often less, but tending to strengthen with time, particularly westernmost hills.
Effect of the wind on you?
Negligible.
How Wet?
Often raining
Areas of rain drift into the hills from the sea much of the day, northern hills most often affected where persistent falls will come and go. Drier windows inland, but some showers breaking out here as well.
Cloud on the hills?
Extensive over tops
A layer of cloud shrouds terrain above 700-800m in the morning, lowest bases to the north where regularly approaching lower slopes in heavier rain. A lifting trend, some breaks to higher terrain to the south and east, but highest summits struggle to clear.
Chance of cloud free summits?
30%
Sunshine and air clarity?
A few bright glimpses to the south and east. Visibility often poor on high terrain in cloud and rain.
How Cold? (at 900m)
7 or 8C, may rise slightly around Penygader.
Freezing Level
Above the summits.
Planning Outlook
As the weekend approaches, wind will shift northerly, moving showers and afternoon thundery downpours further south with time. Generally lighter wind but gusts will be common around showers. Temperature lowering later this week too, dropping close to freezing on high Scottish tops on Friday morning (chance of sleet/snow here) and frost may occur in Highland glens over a couple of nights. More often dry with few lighter showers over the weekend as higher pressure builds into the southwest. Conditions remain on the drier, brighter side early next week, pressure dropping again as the week goes: periods of cloud and rain for most hill groups, and perhaps some stronger wind at times. Detail beyond the weekend is uncertain, and there may well be windows of better weather through the week too.