Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday'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.
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.
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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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.
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.
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
Sunday 9th November 2025
Last updated
Sat 8th Nov 25 at
4:30PM
Summary for all mountain areas
A swathe of rain advances eastwards across all regions during the day, heaviest over south-facing hill groups, patchier northwards across the Highlands, breaking up with time in the west, leaving a few showers, rising cloud bases. Windy, up to gale force high tops, most sustained in Wales.
Headline for Eryri / Snowdonia National Park
Upland gales. Heavy rain, fading only later.
How windy? (On the summits)
South to southwesterly 35-45mph passes west to east through the day, risk 50mph over tops. May ease slightly from the west later.
Effect of the wind on you?
Difficult conditions with considerable buffeting and wind chill. May ease later though remaining strenuous.
How Wet?
Raining most of the day
Frequent rain soon arrives onto western slopes, spreading east and becoming widely persistent for several hours. Heaviest rain on slopes facing the Lleyn peninsula. Breaking up into showery rain during afternoon.
Cloud on the hills?
Extensive
Blanket cloud most of day on slopes facing Cardigan Bay and the Lleyn peninsula. Higher bases towards Carneddau and east-Wales, though largely extensive above 600-700m. Later afternoon, some rise of base.
Chance of cloud free summits?
Less than 10%
Sunshine and air clarity?
A few bright periods on northern slopes, elsewhere foggy and dull.
How Cold? (at 900m)
7 or 8C. Feeling like -5C in direct wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 10th November 2025
Last updated
Sat 8th Nov 25 at
4:30PM
How windy? (On the summits)
Southwesterly 15-25mph.
Effect of the wind on you?
Fairly small
How Wet?
Showers in the west
Intermittent showers drift onto slopes from northern Cardigan Bay towards Snowdon - some showers may be heavy. A risk of merging into a broader area of heavy rain, though detail uncertain.
Cloud on the hills?
Mostly high tops and west slopes
Fog banks at various heights at dawn, soon lifting and fading after sunrise. Cloud will come and go on western slopes with the showers, variably above 600-700m. Many hills often clear, particularly near Carneddau, but highest tops may often be capped.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Often sunny north and east of high summits, more patchy south and west. Excellent visibility.
How Cold? (at 900m)
5C
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 11th November 2025
Last updated
Sat 8th Nov 25 at
4:30PM
How windy? (On the summits)
Southerly, strengthening rapidly overnight up to dawn, 45 to 60mph much of day, risk 70mph at times western high tops.
Effect of the wind on you?
Difficult walking conditions, any mobility challenging around some high tops. Marked wind chill despite mild air.
How Wet?
Rain often heavy
Several hours of constant rain from dawn, heavy over western hills, may then fade to lighter rain and drizzle, but later a risk of prolonged heavier rain setting in again.
Cloud on the hills?
Extensive, lowest southwest
Blanket low cloud across hills, to lower elevations near coasts in west. Mostly above 600m inland with some higher breaks north/east of the A5.
Chance of cloud free summits?
Below 10%
Sunshine and air clarity?
Overcast and murky, better visibility locally toward north if drier for a time.
How Cold? (at 900m)
Rising from before dawn to 6C, soon up to 8 or 9C; only small fall with height. Feeling like -5C directly in the wind.
Freezing Level
Above the summits
Planning Outlook
A cloudy and wet week ahead as several low pressure cores draw frontal systems across the British Isles. Rain at times extensive and heavy, streams in spate with a risk of flooding, primarily western mountains. Winds start fairly light but soon increase with gales becoming widespread by Tuesday, which may persist for several days. Temperatures remain mild until later in the week when cold air begins pushing into northern Scotland - timing and extent of the arrival of cold air remains uncertain but high terrain of Scotland and possibly northern England may start to see more snow around or after next weekend.