Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 19th September 2025
Last updated
Thu 18th Sep 25 at
4:30PM
Summary for all mountain areas
Mostly dry and blustery for Scottish Highlands; cloud, some showers, and risk of gales on west coast tops. Persistent cloud and rain for southern Scotland, north England, and north Wales with a similar risk of gales on highest tops. Rain more patchy south Pennines and south Wales, some cloud breaks to inland summits.
Headline for Eryri / Snowdonia National Park
Persistent rain and cloud; risk gales over high tops
How windy? (On the summits)
Southwesterly 30 to 40mph, strongest over Yr Wyddfa/Snowdon range, very gusty in places around tops and some passes reaching up to 50mph. Tending to ease into evening.
Effect of the wind on you?
Very blustery, affecting balance where exposed on tops and ridges, risk of difficult conditions at times; gusty in places to lower slopes. Considerable wind chill.
How Wet?
Rain or drizzle most of the day west
Persistent rain or drizzle over Eryri/Snowdonia NP, risk becoming heavier at times. Only small amounts reaching the Berwyn Mountains.
Cloud on the hills?
Extensive
Cloud from lower slopes on mountains overlooking the sea. Cloud base will be higher east/north of the A5, but breaks to tops will be rare if any.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Any sunshine unlikely. Poor visibility, locally better around Carneddau.
How Cold? (at 900m)
12C and humid. Feeling close to 0C in the strongest wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 20th September 2025
Last updated
Thu 18th Sep 25 at
4:30PM
How windy? (On the summits)
Forecast details uncertain. South-southwesterly 20 to 35mph, may lull at times.
Effect of the wind on you?
Risk of strenuous conditions throughout the day, balance affected on exposed ridges and in cols. Marked wind chill.
How Wet?
Uncertain: likely persistent, heavy rain
Substantial risk of sustained heavy rain, particularly afternoon and overnight; some chance of occasional breaks.
Cloud on the hills?
Extensive
Hills shrouded down to lower slopes for much of the day, especially afternoon. Should rain ease earlier, cloud base will lift to mid- to upper-slopes and some breaks may develop.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Sunshine unlikely. Poor or very poor visibility.
How Cold? (at 900m)
10C at dawn, lowering to 7C later in the day. Feeling just below freezing in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 21st September 2025
Last updated
Thu 18th Sep 25 at
4:30PM
How windy? (On the summits)
North-northwesterly 35-45mph most of the day. In the morning, risk near 55mph over tops for a time and variable.
Effect of the wind on you?
Walking arduous most of the day, risk difficult on high terrain early. Significant wind chill.
How Wet?
Morning rain breaks to showers
Often raining from dawn, risk well into the morning. Tending to break into showers as the day goes.
Cloud on the hills?
Morning fog, then passing banks on tops
Shrouded from 700-800m in the morning with patchy banks down to middle slopes. Cloud tends to lift and break, though banks will come and go over high tops in showers.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Cloudy most of the day, though weak sunny breaks occurring through afternoon. Very good visibility.
How Cold? (at 900m)
2C rising to 4C, possibly warmer in the morning - detail uncertain. Feeling near or below -8C in the wind.
Freezing Level
Above the summits
Planning Outlook
An unsettled weekend ahead as low pressure brings heavy rain to England and southern Scotland on Saturday with strong winds. Conditions increasingly wet underfoot with streams in spate - some flooding is likely. A northerly wind in Scotland begins to draw unseasonably cold air into the Highlands, bringing freezing levels down to high terrain. Cold air flows into into England and Wales through Sunday on a strong wind - wind chills in direct exposure may reach as low as -10 to -15C. Some showers into northern Scotland on Monday will fade for a substantially dry week ahead with good sunny breaks for many. Temperatures staying cool but slowing rising day-by-day.