Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
Heavy snow and hail showers, isolated lightning
Showery precipitation, often heavy, may merge to become constant for periods. A mix of snow and hail often falling to lower slopes. Risk of very localised thunder and lightning.
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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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Heavy snow and hail showers, isolated lightning
Showery precipitation, often heavy, may merge to become constant for periods. A mix of snow and hail often falling to lower slopes. Risk of very localised thunder and lightning.
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
Monday 13th April 2026
Last updated
Sun 12th Apr 26 at
4:20PM
Summary for all mountain areas
Heavy showers with hail from dawn in northwest Scotland, snow falling as low as middle-slopes. Hail showers become widespread afternoon, a risk of isolating lightning. Cloud above most hills between showers. Chilly temperatures, slightly rising in sun, but suddenly chilly again around showers and also gusty.
Headline for Eryri / Snowdonia National Park
Hail showers increasingly forming, risk of lightning afternoon
How windy? (On the summits)
South-to-southwesterly 10 to 15mph, brief stronger gusts around showers.
Effect of the wind on you?
Mostly small effect on walking, but feeling chilly if exposed to breeze.
How Wet?
Hail showers forming increasingly
Showers mostly close to west coast early morning, a scattering forming inland through morning, becoming widespread into afternoon, briefly heavy with hail, also snow falling to 700-800m; risk isolated thunder & lightning. Showers may be persistent for several afternoon hours.
Cloud on the hills?
Often above hills
Patches of cloud forming around some upper slopes in the morning, mostly coastal areas in west; some patchy mist inland valleys as well. Lifting above most or all summits, but brief patches grazing upper slopes around showers. A risk of more extensive cloud on high terrain during later afternoon showers.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Sunshine best inland in morning, then cloud building, leaving brief bursts of sun, more overcast later in the day. Visibility excellent, but briefly very poor in showers.
How Cold? (at 900m)
-1C rising to +1 or 2C by afternoon, but dropping a few degrees in showers. Wind chill feeling like -3 to -7C on tops.
Freezing Level
800-900m at dawn, some light frosts in sheltered inland valleys, the freezing level lifting above the summits as morning goes.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 14th April 2026
Last updated
Sun 12th Apr 26 at
4:20PM
How windy? (On the summits)
Southerly, 10-20mph in morning, strengthening, 30-35mph afternoon into dusk, but risk 50mph tops for a time.
Effect of the wind on you?
Fairly small from dawn, but likely becoming more blustery over higher terrain, arduous-to-challenging later and feeling chilly.
How Wet?
Rising risk of patchy rain, little until later
As midday approaches, an increasing chance of patchy rain, mostly light, but a heavier burst possible. Onward into evening, more persistent rain and drizzle, likely steadier rain develops western areas.
Cloud on the hills?
Mostly clear morning, filling in later afternoon
Patchy cloud around some slopes early morning, local mist inland valleys at first. Likely to disperse or lift above most hills for several hours. With time afternoon, patches reforming forming as rain arrives, gradually filling in over high terrain into evening.
Chance of cloud free summits?
80%, lowering to 40% afternoon
Sunshine and air clarity?
Patchwork of cloud and sun, high cloud gradually builds to cover the sky. Visibility excellent, reducing if rain develops.
How Cold? (at 900m)
2C rising to 6C, staying lifted into night. Feeling colder later in day as wind increases.
Freezing Level
Close to freezing on highest summits, also frost inland valleys around dawn. Lifting above freezing to tops.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 15th April 2026
Last updated
Sun 12th Apr 26 at
4:20PM
How windy? (On the summits)
Southerly 40-50mph; very gusty, not just high elevations, locally variable direction. Southwesterly trend later.
Effect of the wind on you?
Arduous to often challenging walking with significant wind chill all day; gusts constantly affecting stability.
How Wet?
Drizzle, patchy rain, more later
A persistent drizzle over the summits likely all day, to the middle slopes early, with patchy rain occasionally drifting from the southwest too. Rain sets in persistent and heavy for several hours later, may break late in the day.
Cloud on the hills?
Extensive, some improvement east-Wales
Extensive to at least middle slopes at dawn, to lower slopes or valley level facing Cardigan Bay/Llyn Peninsula. Bases lift somewhat, best Berwyn group, to 600-800m, local breaks here afternoon. Snowdonia/western slopes stay shrouded to at least 500m or lower.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Bursts of sunshine breaking out on lower slopes east, little or no sun west. Largely poor visibility but locally very good where cloud base lifts.
How Cold? (at 900m)
6 or 7C most of the day. Sudden cooling later afternoon, around 4C by evening. Feeling like -5 to -10C in direct wind.
Freezing Level
Above the summits.
Planning Outlook
Tuesday starts largely dry and temperatures trend milder than prior days, but rain and strengthening south-southwesterly winds return from the west later. Milder into mid-late week, but Scottish high tops above 1200m close to freezing at times. Wednesday through Friday sees unsettled conditions with showers, occasionally more persistent rain, accompanied by strong gusty winds, gales over mountains for periods, but also brighter spells between rain. With strengthening sunshine, temperatures will tend to rise several degrees during daylight, often becoming warm in the valleys; slopes north of major hill groups often milder. Higher pressure gradually builds through next weekend, bringing fewer showers and lighter winds; chilly overnight, but fairly mild spring days.