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+
Heavy rain
Near-constant heavy rain, sometimes torrential over the mountains, very wet underfoot.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
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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.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 3rd October 2025
Last updated
Thu 2nd Oct 25 at
4:08PM
Summary for all mountain areas
Mostly dry conditions early with modest wind effects, deteriorating as Storm Amy arrives. Winds reach gale-force around midday, further deteriorating through afternoon, reaching hurricane-force over high Scotland tops later. Rain becomes widespread with sustained heavy falls on western mountains; local flooding is likely.
Headline for Eryri / Snowdonia National Park
Moderate conditions deteriorate to heavy rain and violent wind
How windy? (On the summits)
From dawn, southwesterly 30-40mph, then a sudden rise after midday to a gusty 75-90mph, risk of stronger gusts over high tops.
Effect of the wind on you?
Strenuous conditions from dawn, deteriorating through afternoon to become widely tortuous in storm-force winds.
How Wet?
Heavy rain develops
A little light rain on western hills early morning, but often dry for a few hours. Rain develops from southwest, setting in quickly, sustained heavy falls onward into the afternoon. Increasingly very wet underfoot, western streams in spate or flooding.
Cloud on the hills?
Breaks to tops, then becoming extensive
Patchy cloud on upper slopes in the morning, some lower banks on western slopes; good breaks to many tops of east Wales for a few hours. As rain develops, cloud lowering to blanket the mountains, at times to lower slopes near west coast.
Chance of cloud free summits?
70% dropping below 10%
Sunshine and air clarity?
Any sun soon weak as high cloud increasingly covers the sky to be overcast by early afternoon. Visibility starting very good, then hazier, becoming poor in rain.
How Cold? (at 900m)
7C, rising to around 12C afternoon, then a very sharp drop back to 7C after dark. Feeling much colder as wind increases, in exposure like -5 to -8C.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 4th October 2025
Last updated
Thu 2nd Oct 25 at
4:08PM
How windy? (On the summits)
Westerly 50 to 65mph, at times 70mph higher mountains, risk gusts 80mph+, peak speeds reduce late in the day.
Effect of the wind on you?
Difficult mobility across higher terrain all day, gusts could knock you over. The most severe conditions likely around dawn.
How Wet?
Often raining, setting in at times
Rain on and off, showery in nature, but frequent at times over western mountains. Likely setting in for a few afternoon hours. Fast-flowing streams, some flooding.
Cloud on the hills?
Varied on high tops
Cloud likely to come and go over higher slopes, mostly above 700-800m, with breaks to summits for periods. More extensive for several afternoon hours. Clearer more often further inland and east.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Glimpses of brief sun, more often east, at times entirely overcast. Rather hazy, poor visibility in rain.
How Cold? (at 900m)
4 or 5C. Wind chill making it feel near -10C.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 5th October 2025
Last updated
Thu 2nd Oct 25 at
4:08PM
How windy? (On the summits)
Northwesterly 40-45 from dawn, shifting westerly and easing to 30-40mph.
Effect of the wind on you?
Arduous conditions early, easing though remaining strenuous with considerable buffeting. Notable wind chill.
How Wet?
Rain and drizzle, frequent over tops
Often drizzly on the high tops of the Snowdon group, occasional pulses of light rain more widely. Drizzle tending to set in as the day goes
Cloud on the hills?
Becoming extensive
High tops likely in cloud all day. In the morning, banks on high ground of Snowdon group and towards Anglesey. Filling in in more widely with bases above 600-700m, highest bases east. May break somewhat later in the day.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of morning sun east of high terrain, soon widely overcast. Visibility good from dawn though soon deteriorating with cloud and rain.
How Cold? (at 900m)
4C rising to 7C. Feeling like -5C in direct wind.
Freezing Level
Above the summits
Planning Outlook
Storm Amy clears to the northeast on Saturday, behind which temperatures drop much cooler, to freezing on higher Scottish summits. Showery and windy conditions prevail through the day easing only gradually into Sunday as another mild and humid westerly brings cloud and drizzle to high tops and western slopes. Changeable westerlies continue into the week with frontal boundaries in northern England and Scotland: frequent rain and cloud on western mountains, rain at times passing eastward. Rain and cloud slip south through England and Wales around midweek, though weakening as it goes. Early indications of several days of northerly winds late in the week, which will bring cool, showery conditions to many with a mix of sunny and rainy spells with snow on northernmost tops.