Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday'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.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate 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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 16th May 2026
Last updated
Fri 15th May 26 at
4:28PM
Summary for all mountain areas
Chilly but fine with light winds much of the day for the Highlands. Increasing wind, rain and lowering cloud encroaches onto western coasts later in daytime. Southwesterly breezes elsewhere, largely dry until late for northern England, but rain, drizzle and low cloud moves into Wales sooner, more blustery later.
Headline for Eryri / Snowdonia National Park
Patchy rain becomes persistent, cloud lowers, increasing wind.
How windy? (On the summits)
Westerly 20mph at dawn, easing to 15mph or less for a time in morning. Turning southwesterly, rising gradually toward 25mph afternoon, reaching gusty 30mph particularly by evening; turning west-northwesterly by dusk.
Effect of the wind on you?
Fairly small in morning, but starting to feeling more noticeably breezy with time, gusts later start to affect balance where exposed.
How Wet?
Rain develops, becoming persistent, some heavier rain later
Largely dry early in day, odd brief light showers passing eastwards. Patchy rain and drizzle moving in from west increasingly through middle of day, becoming more persistent western areas afternoon, extending further inland. Some heavier rain for a time later in day. Then showery rain into late evening and night.
Cloud on the hills?
Early breaks; lowering in rain, then extensive, lowest in west
Patchy cloud banks form on some slopes in morning, mainly western areas, some hills clearer for a time for longest in eastern areas. As rain develops, cloud fills in with time over all higher slopes, base lowering soonest in west, filling in to mid-slopes or lower.
Chance of cloud free summits?
70% dropping to 20% afternoon
Sunshine and air clarity?
Any early weak sun gives way to overcast skies. Visibility starts very good, reducing as rain develops, poorer over hills afternoon.
How Cold? (at 900m)
1C rising to 4C afternoon. Feeling like -5C where exposed to stronger wind.
Freezing Level
Close to freezing on higher tops above 900m, plus frost inland valleys at dawn. Rising further above freezing to tops.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 17th May 2026
Last updated
Fri 15th May 26 at
4:28PM
How windy? (On the summits)
West turning southwesterly increasing from 20mph to 30mph during the day, risk 35mph with stronger gusts later.
Effect of the wind on you?
Becoming more blustery, may start to affect ease of walking on exposed terrain with noticeable chill.
How Wet?
Showery bursts move east
A little rain toward west coast early morning, odd showers then develop inland during morning, brief heavier bursts, chance of thunder, but tending to move away eastward during afternoon. Showers return later from west.
Cloud on the hills?
Morning patches, largely clearing
Banks of cloud around higher slopes mostly in west in morning. Lifting to upper slopes, but briefly lowering around showers, then increasingly clearing afternoon.
Chance of cloud free summits?
40% rising to 80%
Sunshine and air clarity?
Largely cloudy with occasional sun, then becoming sunnier near to coast later afternoon onward. Visibility very good, but reduced in showers.
How Cold? (at 900m)
3 or 4C. Feeling nearer -5C as wind increases.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 18th May 2026
Last updated
Fri 15th May 26 at
4:28PM
How windy? (On the summits)
South-southwesterly 15-20mph, but may be stronger up to dawn. Likely increasing afternoon to 30mph, later risk 40mph+.
Effect of the wind on you?
Fairly small part of day, but breezy on tops, becoming increasingly blustery, affecting comfortable walking, worsening later.
How Wet?
Local showers, risk rain later in day
Patchy rain and odd showery bursts possible in morning, likely to fade or clear away eastwards middle of day. Later odd spots as high cloud thickens, by later in day steadier rain develops quickly from southwest.
Cloud on the hills?
Lifting and clearing; lowering late in day
Varied cloud banks around hills in morning, particularly western areas. Lifting higher, clearing tops and increasingly breaking up into middle of day. Later as rain develops, cloud then lowering back onto hills.
Chance of cloud free summits?
40% rising to 80%; dropping by dusk.
Sunshine and air clarity?
Variable cloud, glimpses of sun, high cloud tends to build to cover the sky afternoon, overcast later. Visibility very good, reducing later in rain.
How Cold? (at 900m)
2C rising to 5C. If exposed to increasing wind later, feeling nearer -5C, or colder toward dusk.
Freezing Level
Above the summits.
Planning Outlook
A mixed but milder outlook. Showery bursts of rain Sunday and Monday, passing eastwards during the daytimes, generally improving afternoons in western areas. By later Monday, strengthening southerly winds and rain moving into Wales from the southwest. Damp south-southwesterlies then prevail for a few days next week, with rain at times Tuesday and Wednesday, most on western hills, particularly Scotland. A drier and much warmer theme later in the week as higher pressure builds.