Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday's Forecast
Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather 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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Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather 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
Friday 23rd October 2026
Last updated
Thu 22nd Oct 26 at
4:27PM
Summary for all mountain areas
Prolonged heavy rain for south & eastern Scotland, increasingly snow over higher mountains. Patchier showery rain toward the west coast. Very variable wind for Scotland, but gales will be severe on Welsh mountains, heavy rain also persistent here. Rapid increase of wind over northern England into afternoon.
Headline for Eryri / Snowdonia National Park
Severe mountain gales; rain frequent or persistent, snow high tops.
How windy? (On the summits)
Variable low speeds only up to dawn, soon northwesterly, swiftly strengthening early in day to 55-70mph, dropping only slowly evening, to 30-40mph into night.
Effect of the wind on you?
Rapidly deteriorating from dawn to difficult conditions, any mobility difficult in exposure on high terrain, gusts may knock you over; challenging even on lower hills; severe wind chill.
How Wet?
Rain most of the day, snow high tops
Rain fairly persistent from dawn, a few patchier moments early inland but then setting in for several hours of heavy falls particularly towards northwest hills, turning to sleet or snow on high terrain above 800m. Breaking up into showers later afternoon, fewer into evening. Becoming dry into night.
Cloud on the hills?
Extensive, chance of a late improvement
Blanket fog to at least middle slopes likely all day, and often to lower slopes; some local variability as wind shifts direction. Starting to lift and break up a bit late in the day, some clearances to tops perhaps only around or after sunset.
Chance of cloud free summits?
10% until practically dusk
Sunshine and air clarity?
Overcast and dull likely all day, some later brighter skies before dark in west. Poor visibility, improving only later if showers fade.
How Cold? (at 900m)
5C just at first, soon 3C, then 1C by middle of day onward. Feeling as cold as -15C in strongest wind.
Freezing Level
Above the summits to start, lowering to around 1000m into afternoon, slightly lower in heavier showers.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 24th October 2026
Last updated
Thu 22nd Oct 26 at
4:27PM
How windy? (On the summits)
South-southwesterly, 30mph or briefly less at first, rising rapidly to reach 60-70mph; marked increase with height.
Effect of the wind on you?
Deteriorating, soon arduous walking, increasingly difficult mobility on higher terrain, significant wind chill.
How Wet?
Heavy rain soon sets in
Dry around dawn, for an hour or so more east Wales, but rain soon moves in from west, setting in increasingly heavy during morning and continuing afternoon. Showery evening into night. Very wet underfoot, streams in spate.
Cloud on the hills?
Soon lowering to become extensive
Initially most cloud above the hills inland, apart from odd patches at varied heights. Soon cloud will lower onto hills, forming to lower elevations coastal areas; some higher breaks remain north of Ogwen and toward east Wales.
Chance of cloud free summits?
60% at first inland, soon 10%
Sunshine and air clarity?
High cloud soon thickens from dawn to overcast skies. Good visibility at first inland and east soon becomes hazier, then poor as rain sets in.
How Cold? (at 900m)
2 or 3C from dawn, rising to 7C afternoon, later briefly 10C, then falling after dark. Always feeling below freezing in the wind.
Freezing Level
Close to highest tops before dawn, lifting well above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 25th October 2026
Last updated
Thu 22nd Oct 26 at
4:27PM
How windy? (On the summits)
Westerly 50-60mph in morning, gusts over 70mph on highest tops, speeds tending to lower during day to around 40mph.
Effect of the wind on you?
Difficult conditions, mobility challenging; may improve a little, but still arduous walking and significant wind chill on tops.
How Wet?
Showers, tending to lessen
Showery rain most frequent in the morning, some hail mixed in with heavier bursts, possible sleet or wet snow highest tops. Fewer showers east and becoming more scattered and briefer afternoon.
Cloud on the hills?
Fairly extensive but tending to lift
Cloud base varying, but often capping western tops above 700-800m, rarely clearing in morning, some banks to 600m or lower in showers. Breaks more often in east and more widely afternoon.
Chance of cloud free summits?
20% rising to 50%
Sunshine and air clarity?
Brief bursts of sun, mostly east. A general haze, poor visibility in showers, tending to improve, more often good east.
How Cold? (at 900m)
2 or 3C. Wind chill feels like -10 to -15C in exposure.
Freezing Level
Just above highest summits.
Planning Outlook
Stormy conditions widely across the mountains this weekend, peak wind speeds into Sunday over Scottish mountains with gusts 100mph on higher tops. Heavy rain will sweep in again from the west during Saturday, leaving showery conditions for Sunday, turning back to snow on higher terrain in Scotland. Very wet ground conditions, beware flooding of many streams and rivers making some routes impassable. A relative lull by early Monday in Scotland, but the next weather system soon sweeps in from the southwest with more heavy rain and extensive mountain gales, continuing into Tuesday. Mild south-southwesterlies mid-late week; smaller amounts of rain, some drier windows toward east and south.