Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday's Forecast
Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very 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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Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very 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
Sunday 29th March 2026
Last updated
Sat 28th Mar 26 at
4:00PM
Summary for all mountain areas
Widely difficult conditions - extensive gales across the hills, often severe on higher terrain; a few hours of storm-force winds moving southward accompanied by a swathe of heavy rain, some snow on high tops. Colder air follows across Scotland, with frequent showery hail and snow, periods of whiteout on mountains.
Headline for Eryri / Snowdonia National Park
Upland gales become severe, rain sets in heavy for a time.
How windy? (On the summits)
Southwest later westerly 45 to 60mph, speed varying, peak speeds into middle of day, sudden powerful squalls to 70mph.
Effect of the wind on you?
Difficult walking conditions on mountains, becoming severe for a time, any mobility challenging, powerful gusts could knock you off your feet. Significant wind chill.
How Wet?
Rain becomes heavy during middle of day
Largely dry around dawn, but a swathe of heavy rain moving in from northwest in morning, brief snow on tops. Torrential bursts for a time into middle of the day. Breaking up from north during afternoon to leave a few showers.
Cloud on the hills?
Lowest in rain toward west
Varied mostly over higher western slopes early in day, but filling in more extensively, lowering to 500-600m. Then rising late in day with some breaks forming to tops.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Largely cloudy, bright skies at dawn soon fade; brightening up later in daytime. Visibility very poor in rain, improving late in the day as rain clears.
How Cold? (at 900m)
0C rising to 3C afternoon, then dropping back toward 0C after dark. Wind chill feeling like -12 to -15C.
Freezing Level
Rising from before dawn to be just above freezing to the tops by late morning at least. Dropping back toward 900m after dark.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 30th March 2026
Last updated
Sat 28th Mar 26 at
4:00PM
How windy? (On the summits)
Northwesterly 35 to 45mph, strongest in the morning, gusts over 50mph for a time higher mountains.
Effect of the wind on you?
Strenuous walking conditions, frequent buffeting in exposure, balance difficult on ridges. Considerable wind chill.
How Wet?
Light showers for a time
An odd light shower or snow flurry over hills above 600m in morning, fading out.
Cloud on the hills?
Lifting to higher tops, breaks form
Cloud banks drifting over higher slopes, mostly above 600-700m in morning, tending to rise. Patches come and go on high western tops, increasing breaks. Will then lower from southwest into night.
Chance of cloud free summits?
60% rising to 80% inland
Sunshine and air clarity?
Occasional sun, most common east. Visibility mostly good, slight haze.
How Cold? (at 900m)
0C rising to 3C afternoon, then higher after dark. Wind chill feeling like -10 to -13C.
Freezing Level
900-1000m from dawn, rising above highest summits during middle of day.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 31st March 2026
Last updated
Sat 28th Mar 26 at
4:00PM
How windy? (On the summits)
Westerly, 20 to 25mph, in places gusty 30mph around higher tops.
Effect of the wind on you?
Fairly small, but gusty areas may start to affect balance on exposed ridges, feeling quite chilly despite milder air.
How Wet?
Drizzly rain, fading during day
Drizzle and light rain most persistent and widespread during the morning. Tending to fade, but patchy drizzle may linger near west coast, feeling generally damp where within cloud, making rock surfaces slippery.
Cloud on the hills?
Extensive, then rising and breaking
Blanket low cloud across the hills in the morning, from lower elevations up in west, 400-500m inland. Tending to rise to 600-700m, breaks gradually forming, but banks likely come and go on high western tops.
Chance of cloud free summits?
Below 10%, rising to 40% afternoon.
Sunshine and air clarity?
Cloudy and misty, some brighter moments emerge with time inland, perhaps more widely afternoon, visibility becoming good where cloud lifts and breaks.
How Cold? (at 900m)
4 or 5C. Feeling like -3 to -5C directly in the wind.
Freezing Level
Above the summits.
Planning Outlook
Milder air across all areas by Tuesday, with drizzly rain and low cloud particularly in the west. A drop of temperature returns to Scotland at least during Wednesday, with a belt of rain expected to move slowly southwards, followed by showers turning to snow again on higher areas, possible hail. Uncertain southward extent of rain and colder air beyond midweek - lower confidence in forecast detail toward Easter - high pressure toward the east and south brings some drier weather, but Atlantic weather systems may continue to move near to the northwest of Britain bringing further spells of strong wind and rain, plus fluctuating temperatures in Scotland, whilst further south likely stays milder.