Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday'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.
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.
Clear
Excellent or superb visibility, no navigation issues.
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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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
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.
Clear
Excellent or superb visibility, no navigation issues.
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
Tuesday 26th May 2026
Last updated
Mon 25th May 26 at
4:30PM
Summary for all mountain areas
Low cloud and early drizzle in northwest Scotland, improving with cloud thinning and breaking, but staying cool toward the far north. Very warm and sunny for England and Wales. Chance of isolated late heavy showers forming, but mostly dry.
Headline for Eryri / Snowdonia National Park
Very warm, sunny. Light wind.
How windy? (On the summits)
Varying in direction, 5-10mph or less; locally up to 15mph some coastal hills where sea breezes develop.
Effect of the wind on you?
Mostly negligible
How Wet?
Likely dry, chance a late shower south
Very likely dry, but risk of cloud bubbling up in the afternoon to give an isolated shower mainly mid Wales, but should they occur, slow-moving heavy burst or thunderstorm.
Cloud on the hills?
Mountains clear
Chance of cloud free summits?
Practically certain
Sunshine and air clarity?
Widespread sunshine, but areas of cloud will bubble up in the afternoon. Visibility mostly good or very good, but slight haze.
How Cold? (at 900m)
17 to 20C, humid. Hottest mid & east Wales where valley temperatures will rise toward 28C.
Freezing Level
Well above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 27th May 2026
Last updated
Mon 25th May 26 at
4:30PM
How windy? (On the summits)
Southeasterly 15 to 20mph, but up to 30mph at times as marked gusts develop, with highest gusts not always on tops.
Effect of the wind on you?
Rather blustery and increasingly gusty through the day.
How Wet?
Substantially or completely dry
Perhaps the odd burst of showery rain possible very late in the day, running up the west coast.
Cloud on the hills?
Largely clear, some early cloud east
Early patchy low cloud confined to east Wales, will lift and break off the hills, to leave all areas clear by midday. Western mountains clear all day.
Chance of cloud free summits?
90%, but 50% east Wales morning.
Sunshine and air clarity?
Patchwork of sunshine, increasingly sunny with thin high cloud, but may thicken later. Visibility good, but marked haze.
How Cold? (at 900m)
15 to 18C.
Freezing Level
Well above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 28th May 2026
Last updated
Mon 25th May 26 at
4:30PM
How windy? (On the summits)
South turning southwesterly, 25 to 40mph, gusty at first, then mean speed generally increasing afternoon, risk to 40-50mph.
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.
Planning Outlook
Very warm air extends into Scotland during midweek on southerly winds. Isolated bursts of rain form, greater risk toward Wales by Wednesday night, then drifting variably northward during Thursday daytime - some uncertain local detail and timing, but scattered thunderstorms are possible by this time. Winds also strengthening and becoming very gusty. Some rain in western Scotland by Thursday night which may linger into Friday here on westerly winds, but a fine end to the week for many places. Further rain and low cloud likely returns to western Scotland over the weekend, possible showers elsewhere. A more unsettled west-southwesterly pattern is likely into early June, cooler with rain and stronger winds for periods.