Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today'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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature near or just above freezing 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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature near or just above freezing 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
Wednesday 22nd January 2025
Last updated
Tue 21st Jan 25 at
3:42PM
Summary for all mountain areas
A quiet day overall with light winds. Local showers near western coasts, but many places staying dry. Fairly extensive cloud, persisting over some upper slopes all day, local breaks generally better toward east and north. Near or just below freezing over higher terrain.
Headline for Eryri / Snowdonia National Park
Light winds. Light showers toward coast, low cloud.
How windy? (On the summits)
Variable direction, 10mph or less in morning. During afternoon, west to northwesterly, 10 to 15mph, increasing a little into evening.
Effect of the wind on you?
Little to none, but noticeable wind chill later in the day.
How Wet?
Coastal light showers
Drizzly pockets from dawn. Occasional light showers mostly on hills nearest coasts, may drift further inland during afternoon with snow flurries on higher summits.
Cloud on the hills?
Low cloud covering many tops
High terrain frequently covered, varied elevation in morning, tending to lift to upper slopes, but some banks likely to come and go above 700m, lowest on windward western slopes. Breaks mainly toward east.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Glimpses of sun. Good visibility out of cloud; hazier toward east Wales.
How Cold? (at 900m)
Around 0C
Freezing Level
900m
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 23rd January 2025
Last updated
Tue 21st Jan 25 at
3:42PM
How windy? (On the summits)
South-southwest turning abruptly westerly; speeds soon increasing to 50mph, risk 60-70mph for a time, suddenly squally.
Effect of the wind on you?
Soon difficult conditions, frequent buffeting where exposed; gusts may knock you over. Significant wind chill.
How Wet?
Heavy rain, some snow highest tops
Soon from dawn, abruptly heavy rain, sleet or at times snow above 800m. Continuing for several hours, then breaking up into clusters of showers into afternoon, but may still result in frequent precipitation. Chance isolated thunder.
Cloud on the hills?
Varied low cloud, highest north
Varied patches at first, but cloud at dawn may be mostly above hills. Lowering extensively in rain, most persistent southwest from Snowdon/Yr Wyddfa group. Higher bases Carneddau.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Generally overcast. Visibility very poor in rain, locally better at times in north.
How Cold? (at 900m)
Around 0C. Wind chill feeling like -15C.
Freezing Level
900m or above, dropping to 800m or briefly lower for periods.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 24th January 2025
Last updated
Tue 21st Jan 25 at
3:42PM
How windy? (On the summits)
An intense storm system: south veering westerly; threat over 80mph all day, risk over 100mph on highest tops.
Effect of the wind on you?
Severe conditions likely all day, any mobility very difficult even on lower slopes, possibly widely damaging gusts.
How Wet?
Early rain then showers turning to snow
Heavy rain at dawn soon clearing eastwards, followed by clusters of showers, increasingly snow on tops.
Cloud on the hills?
Varied over the tops
Cloud base soon mostly confined to upper slopes, but likely to come and go all day, most frequent mountains furthest west.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Occasional sun, mostly east. Hazy at best, visibility very poor in precipitation.
How Cold? (at 900m)
Briefly 5C at dawn, falling quickly to -1C.
Freezing Level
Above the summits overnight and post-dawn, then lowering possibly rapidly to around 800m, perhaps lower.
Planning Outlook
Deteriorating later this week - a series of storm systems coming in from the Atlantic through late January bringing frequently severe conditions to the mountains. Thursday sees winds reach gale force on many tops with a spell of heavy rain and upland snow developing from the west. By Friday, severe conditions from lower elevations upward, hurricane-force winds over the mountains, plus extensive rain and hill snow. Gales continue into Saturday, severe for the Highlands. Snow is likely to accumulate over Scottish mountains during the next week or so with only brief thawing. More variable temperatures for England and Wales with cycles of freeze and thaw. Atlantic patterns likely prevail into early February.