Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday'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+
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.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra 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+
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.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 24th October 2026
Last updated
Fri 23rd Oct 26 at
4:15PM
Summary for all mountain areas
The Pennines and east Scotland begin with weak sun through high cloud and largely dry. Western areas start cloudier with patchy rain, then Storm Boelo draws a swathe of heavy rain and severe gales eastward across all areas, a period of storm-force wind for many summits. Steams in spate, localised flooding.
Headline for Eryri / Snowdonia National Park
Heavy rain and severe gales soon arrive
How windy? (On the summits)
South-southwesterly 30mph to start, rising rapidly to reach 60-70mph; marked increase with height, and speeds briefly reaching 80mph+.
Effect of the wind on you?
Deteriorating soon to arduous walking, increasingly difficult mobility on higher terrain and likely a period of more severe conditions. Significant wind chill.
How Wet?
Heavy rain soon sets in
Some patchy rain just around dawn, driest east Wales, then rain soon moves in from west, setting in increasingly heavy during morning and continuing afternoon, a risk of torrential falls over high and western terrain. Showery evening into night. Very wet underfoot, streams in spate.
Cloud on the hills?
Soon lowering to become extensive
Patches at varied heights to start, perhaps a few well-inland high summits clear. Cloud soon lowers onto hills, increasingly extensive and forming to lower elevations coastal areas; some higher breaks remain north of Ogwen and toward east Wales for a time, but will become extensive here too during heaviest rain.
Chance of cloud free summits?
60% at first inland, soon 10%
Sunshine and air clarity?
High cloud at dawn soon thickens to overcast skies. Good visibility at first inland and east, soon becoming hazier, then poor as rain sets in.
How Cold? (at 900m)
2 or 3C from dawn, soon rising reaching 7C afternoon, to briefly 10 or 11C, then cooling again evening into night. Always feeling below freezing in the wind, as cold as -7C.
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
Fri 23rd Oct 26 at
4:15PM
How windy? (On the summits)
Westerly 55-70mph in morning, gusts to 80mph on highest tops, speeds tending to lower to later reach 45mph.
Effect of the wind on you?
Severe 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.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 26th October 2026
Last updated
Fri 23rd Oct 26 at
4:15PM
How windy? (On the summits)
Southerly 30mph just at dawn, strengthening and shifting southwesterly 50-65mph with powerful gusts.
Effect of the wind on you?
Walking soon difficult, maintaining balance a near-constant effort and feeling chilly despite mild temperature.
How Wet?
Rain much of the day
Rain sets in from dawn into morning, several hours of persistent falls with heavy moments, particularly on and west of high terrain. Will ease afternoon though remaining drizzly on high terrain with patchy rain at times.
Cloud on the hills?
Extensive
Blanket cloud over the mountains, to low slopes in many places, to valley level south and west of high terrain. A few breaks approach 600m towards Carneddau as rain eases.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast, largely dull on high terrain, poor visibility. A few bright glimpses may form afternoon to the north and east, but a building haze too.
How Cold? (at 900m)
Starting around 5C, sharply rising to 11C. Feeling below 0C in direct wind.
Freezing Level
Above the 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. 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. Generally staying windy, particularly in Scotland. Some chance of a mid-late week ridge of high pressure in England and Wales, but unlikely to persist.