Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday'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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Click an icon for more information or click here for a key to all icons.
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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 28th August 2026
Last updated
Thu 27th Aug 26 at
4:26PM
Summary for all mountain areas
Frequent rain for England and Wales well into the day, clustering into heavy falls and local thunderstorms; poor visibility on many tops and some fast flowing streams. Easing to lighter showers later. Rain and drizzle over north and notably east Scotland, best of clear hills west highlands. Widely warm and humid.
Headline for Eryri / Snowdonia National Park
Showers, some heavy and thundery; warm and humid
How windy? (On the summits)
A varied westerly, generally 15-25mph; will ease briefly, speeds to 10mph or lower.
Effect of the wind on you?
Fairly small, gusty periods on high terrain.
How Wet?
Drizzle and showers, frequent and heavy for a time
Drizzly on the high tops and upper western slopes. Shower breaking out here and there, becoming frequent and clustering together for several hours, some heavy falls with a risk of thunder. Clearing east with time, followed by patchy rain.
Cloud on the hills?
Extensive, some variability
Hills shrouded from middle slopes up at least in the morning, briefly rising, breaks possibly towards 700-800m towards Carneddau for a time, but lowering again as heavier showery rain arrives, blanket cloud filling in to middle slopes at least with patches as low as western valleys.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of sun but more often overcast. Varied visibility, generally poor on high terrain in cloud and rain, but locally very good on lower slopes during dry windows.
How Cold? (at 900m)
11 or 12C; humid.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 29th August 2026
Last updated
Thu 27th Aug 26 at
4:26PM
How windy? (On the summits)
Generally southwesterly, some variability, 20-35mph, and may strengthen further for a time with stronger gusts.
Effect of the wind on you?
Walking at times strenuous on high terrain, strongest gusts impacting balance with a chilly feeling.
How Wet?
Rain most of the day
Rain through most of morning, heavy falls come and go, risk of local thunder. Rain will ease somewhat, and perhaps break briefly, though staying drizzly on high terrain and western slopes, with patchy areas of rain returning too.
Cloud on the hills?
Extensive
Cloud rarely breaking above 500m, bases regularly approaching low slopes, and to valley level on western slopes during heaviest rain. Bases will tend to rise late in the day and break up somewhat but high summits unlike to clear.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast and dull. Poor visibility.
How Cold? (at 900m)
10 or 11C. Feeling around 5C in strongest wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 30th August 2026
Last updated
Thu 27th Aug 26 at
4:26PM
How windy? (On the summits)
Southwesterly 15-20mph, strengthening, top speeds to 35mph or higher later but will continue to vary.
Effect of the wind on you?
Ease of walking becomes affected, and later more strenuous conditions for a time with a chilly feeling.
How Wet?
Rain sets in, rumbles of thunder
Drizzly rain affects high western hills from the morning. Patchy rain drifts from the west, increasingly frequent and heavy and will set in for several hours of persistent falls, risk of thunder for a time.
Cloud on the hills?
Fairly extensive, brief improvement
Fairly extensive from dawn, many hills shrouded to middle slopes, particularly west. A lifting trend for a time, some high breaks forming to the east. Cloud will fill back in across high terrain and increasingly lower as rain sets in.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Some bursts of sunshine, best in the east with good visibility. Increasingly overcast, visibility turning poor.
How Cold? (at 900m)
10C rising to 12C, cooling again before evening. Feeling like 2 to 4C in strongest wind.
Freezing Level
Above the summits.
Planning Outlook
A generally damp weekend ahead, particularly in England and Wales: several bands of rain will pass west-to-east, cloud often shrouding hills, particularly west where only slightly improving away from the main areas of rain. Some stronger wind will affect Wales at times, notably south. Less rain over Scotland, though a little drizzly rain here and there will become local showery bursts through afternoon; variable cloud, tending to lift during the day but returning where rain forms. Also minimal wind in Scotland, mild temperatures. Westerly flow is expected next week, drawing cloud and showers into western areas, particularly in Scotland, with periods of strong wind and broader areas of rain more widely across the country. Best of bright breaks to the east.