Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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.
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 15C on tops. Increasingly hot on lower terrain, reaching 25C+ in many valleys. Beware of dehydration.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
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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.
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 15C on tops. Increasingly hot on lower terrain, reaching 25C+ in many valleys. Beware of dehydration.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 27th May 2026
Last updated
Tue 26th May 26 at
4:00PM
Summary for all mountain areas
A largely sunny day in NW Scotland, whilst low cloud in central-E Scotland & NE England in the morning will gradually thin and break, but may linger toward the North Sea. Gusty SE'ly winds for England & Wales, but remaining very warm. Localised thundery rain may develop in Wales, mainly south.
Headline for Eryri / Snowdonia National Park
Gusty wind, increasing. Very warm sun, high cloud.
How windy? (On the summits)
Southeasterly 15 to 25mph, some very gusty spots, tending to strengthen, over 30mph at times afternoon-evening, risk 40mph in west by dusk, with highest gusts not always on tops.
Effect of the wind on you?
Rather blustery and increasingly gusty through the day. Later toward evening more frequent buffeting gusts.
How Wet?
Likely dry until late
Chance of an odd burst of showery rain late in the day, running up the west coast, then by late evening into night, risk of an isolated thundery downpour.
Cloud on the hills?
Largely clear, some early cloud east
Western mountains clear all day. Early patchy low cloud confined to eastern mid-Wales will lift and break off the hills in morning to leave hills soon clear.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Largely sunny with thin high cloud, but may thicken later to cover more of the sky. Beware high UV and sunburn. Visibility good, but marked haze.
How Cold? (at 900m)
15 to 18C; already warm on tops from dawn, valleys start cooler.
Freezing Level
Well above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 28th May 2026
Last updated
Tue 26th May 26 at
4:00PM
How windy? (On the summits)
South turning southwesterly, 25 to 40mph, gusty at first, then mean speed generally increasing afternoon, risk to 45mph.
Effect of the wind on you?
Blustery, affecting ease of walking and balance on exposed terrain. May become widely strenuous or arduous over hills.
How Wet?
Early thundery bursts likely clear
Possible sporadic overnight thundery downpours ongoing through to dawn, may continue to drift northeast into morning, then may largely clear. Then more likely dry, but some fine drizzle near coast.
Cloud on the hills?
Varied, may fill in west coast
Ragged patches over hills at varied elevations during and just after rain for a time in morning, likely to lift and clear. During afternoon, low cloud may roll in from Cardigan Bay over hills nearer coasts.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Varied sun and high cloud, more overcast skies likely for a time, mainly morning. Rather hazy, poorer visibility if in rain; may improve for a time, risk mistier later west.
How Cold? (at 900m)
14 to 16C. Feeling like 5C or later cooler where directly in the stronger wind.
Freezing Level
Well above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 29th May 2026
Last updated
Tue 26th May 26 at
4:00PM
How windy? (On the summits)
Southwesterly 15 to 25mph.
Effect of the wind on you?
Fairly small, but breezy over higher exposed terrain, may feel noticeable on ridges; rather cool.
How Wet?
Rain rare if any
Chance of a brief drizzly shower west coastal areas in the morning.
Cloud on the hills?
Most common over west coast hills
Banks of cloud over hills, may come and go toward coast above 600-800m. Higher bases north and eastward, breaks above the summits. May all break up with time.
Chance of cloud free summits?
50%
Sunshine and air clarity?
A little sun mostly toward east. Visibility good below cloud, hazier west coastal areas.
How Cold? (at 900m)
9 or 10C. Wind chill may feel near 0C on high tops.
Freezing Level
Above the summits.
Planning Outlook
Very warm air wafts north across the Highlands by Thursday, but this also brings a risk of scattered thundery showers forming; strong and gusty southerly winds. Gale or near-gale force southwesterlies into Friday for the Highlands, strongest toward the northwest, where accompanied by rain, drizzle and low cloud. The recent heat across England and Wales will ease back to nearer average temperatures into the weekend. From the weekend into next week, southwesterlies will prevail, bringing changeable conditions in from the Atlantic - rain, drizzle and low cloud most common on western coastal mountains, but showery days are likely more widely at times. Temperatures near average, some cooler days.