Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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
Wednesday 21st October 2026
Last updated
Tue 20th Oct 26 at
4:29PM
Summary for all mountain areas
Slow-moving areas of cloud and rain make for variable conditions fairly widely. A swathe of gales sweeps across Wales, later into England with heavy rain and low cloud. Brighter, showery weather follows into Wales later. Several pulses of rain in Scotland; steady falls in the east through morning, tending to lessen.
Headline for Eryri / Snowdonia National Park
Swathe of gales and rain arrives through morning
How windy? (On the summits)
Variable and perhaps a brief lull below 20mph in the early morning, then a rapid increase, sustained speeds reaching 50mph, gusting up to 60mph well into afternoon, beginning to lessen evening into night.
Effect of the wind on you?
May just start fairly small, but soon deteriorating, walking becoming difficult with significant wind chill; strongest gusts may knock you off balance.
How Wet?
Frequent heavy rain, snow tops
Often raining throughout the day, a mix of steady falls and some heavier bursts at times, which may set in for longer over mountains towards the northwest, at times snow on higher tops above 800-900m. Will begin to break into patchy rain and showers later.
Cloud on the hills?
Fairly extensive
Often covering higher slopes above 600-700m in western areas, sometimes lower near coast. A few higher breaks possible east of high tops, particularly towards Bala, but also several hours of extensive low cloud likely, and only more broadly breaking up late in the day/evening.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Largely cloudy, some sunny glimpses forming later. Visibility often reduced in rain, at times poor, particularly higher up if snowing.
How Cold? (at 900m)
2 or 3C, most of the day. Just around dawn, may be slightly milder, as well as into evening/nighttime. Feeling like -10 to -13C if exposed to stronger wind.
Freezing Level
Mostly above the summits, but may approach freezing on highest tops at times.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 22nd October 2026
Last updated
Tue 20th Oct 26 at
4:29PM
How windy? (On the summits)
Westerly 20-25mph turning southerly, briefly lessening, then sharply rising towards 40mph, further rising overnight.
Effect of the wind on you?
Generally fairly small, some blustery moments and feeling chilly, deteriorating to severe conditions into night.
How Wet?
Shower fade, then rain into night
Showers drifting from Cardigan Bay from dawn, may briefly cluster but tending to fade to just isolated spots of rain, and perhaps mostly dry afternoon. Rising risk of rain returning, setting in overnight.
Cloud on the hills?
Lifting to caps on summits
Most hills above 700m begin shrouded, banks lowering towards 400m or lower towards Cardigan Bay around showers. Cloud will tend to lift and break as showers fade, to mostly just caps above 900m for a time, and some breaks likely too.
Chance of cloud free summits?
30%, to 50% for a time
Sunshine and air clarity?
Patchy sunshine, brighter windows east, then high cloud building afternoon into evening. Very good visibility.
How Cold? (at 900m)
2C rising to 4C, rising further into night. Feeling near or colder than -5C in wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 23rd October 2026
Last updated
Tue 20th Oct 26 at
4:29PM
How windy? (On the summits)
Variable from dawn, mostly 20mph and less, then shifting northwesterly, swiftly strengthening to 55-70mph.
Effect of the wind on you?
May be fairly small in the early hours, but rapidly deteriorating to difficult conditions with severe wind chill.
How Wet?
Rain most of the day
Rain fairly persistent from dawn, a few patchier moments early but then setting in for several hours at least, steadiest heavy falls towards northwest hills.
Cloud on the hills?
Extensive
Blanket fog to at least middle slopes likely all day, and often to lower slopes; some local variability as wind shifts direction. May begin to lift and break up a bit late in the day but perhaps only after dark.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast and dull likely all day. Poor visibility.
How Cold? (at 900m)
Starting at 4 or 5C, soon lowering towards 1C. Feeling as cold as -15C in strongest wind.
Freezing Level
Above the summits to start, lowering to around 1000m later.
Planning Outlook
Thursday offers a window of brighter weather, a few showers will linger on west coastal areas, particularly west Scottish highlands. Thursday evening into Friday sees a deep area of low pressure move across England & Wales. The exact track of the low remains uncertain, but expect periods of heavy rain widely, turning to snow on high Scottish summits. Varied wind, perhaps a lull in some north areas on Friday, but gales soon sweep into Wales and gradually spread widely. Varied conditions follow over the weekend: another brief window of high pressure on Saturday morning, followed by another area of low pressure for widespread rain and gales. Atlantic westerlies remain dominant next week, bringing several low pressure systems with rain and wind, punctuated by brief clearer windows.