Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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
Sunday 12th April 2026
Last updated
Sat 11th Apr 26 at
4:00PM
Summary for all mountain areas
Gales will be severe all day over Scottish mountains, whilst upland gales gradually lessen for northern England, easing sooner in Wales, but remaining blustery. Widespread heavy showers merging into more constant precipitation in western Scotland, powerful squalls with hail, snow falling at times and risk of thunder.
Headline for Eryri / Snowdonia National Park
Windy, early gales lessening. Showery bursts, hail, snow tops.
How windy? (On the summits)
Southwesterly, 50mph up to dawn higher tops, soon typically 30-40mph during morning, strongest northwest; lessening gradually afternoon to 25mph, but squally gusts all day around showers.
Effect of the wind on you?
Arduous walking on hills in morning, buffeting gusts affecting balance, tending to improve. Considerable wind chill.
How Wet?
Heavy showers, hail, snow; risk thunder
Showery throughout the day, locally more frequent precipitation for periods, mostly toward west in morning, some drier moments occur. Heavy bursts with hail, snow at times falling toward 600m, risk of isolated thunder & lightning.
Cloud on the hills?
Varying on high tops
Most cloud often confined above 700-800m, clearing tops periodically, but briefly lower patches around 600m in showers, most frequent in west in morning.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Brief moments of bright sunshine. Visibility changing suddenly from very good to very poor or briefly appalling in showers.
How Cold? (at 900m)
0C rising to 2C by afternoon, but dropping slightly during showers. Wind chill feeling like -10C, nearer -15C at first on tops.
Freezing Level
900m at first, rising above 1000m, briefly lower in showers.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 13th April 2026
Last updated
Sat 11th Apr 26 at
4:00PM
How windy? (On the summits)
Southerly 10 to 20mph, 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, then a scattering forming inland, widespread into afternoon, briefly heavy with hail, also snow may fall to 600m. Risk isolated thunder & lightning.
Cloud on the hills?
Often above hills
Patches of cloud forming around some upper slopes in the morning, mostly coastal areas in west. Lifting above most or all summits, but brief patches grazing upper slopes around showers.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Sunshine best inland in morning, then cloud building, leaving brief bursts of sun. 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
800m at first, also frost sheltered inland valleys; rising above 1000m into middle of day and afternoon.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 14th April 2026
Last updated
Sat 11th Apr 26 at
4:00PM
How windy? (On the summits)
Southerly, 10-20mph in morning, tending to strengthen afternoon to 30mph, by dusk 35-40mph. Into night 50mph.
Effect of the wind on you?
Fairly small for half the day at least, but likely becoming more blustery over higher terrain, more challenging later in west.
How Wet?
Risk a little rain, may be little until late
Risk of spots of light rain or briefly showery rain, mainly during the afternoon. Onward into evening, more persistent rain and drizzle, likely steadier rain develops western areas.
Cloud on the hills?
Mostly little, forming in west later
Patchy cloud around some slopes early morning, local mist inland valleys at first. Likely to disperse or lift above most hills. Patches forming locally if rain occurs, then late in day may fill in over west coast hills.
Chance of cloud free summits?
80%
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)
1C rising to 6C. 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.
Planning Outlook
Chilly and showery conditions to start the new week, hail and a risk of isolated thunder into Monday afternoon, but less windy than the weekend. Drier for much of Tuesday, 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, showers or some more persistent rain, mostly in the west, accompanied by strong winds, gales over mountains for periods. Higher pressure gradually builds by next weekend, bringing fewer showers and lighter winds; chilly overnight, but fairly mild spring days.