Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
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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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.
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
Monday 1st December 2025
Last updated
Sun 30th Nov 25 at
4:24PM
Summary for all mountain areas
Morning rain and snow in Scottish Highlands breaks for several hours then returns from the south later. Rain more persistent over the Southern Uplands with heavy bursts south and a risk of strong winds. Gales and rain widely across England and Wales, increasing risk of flooding in Lakeland and west Wales.
Headline for Eryri / Snowdonia National Park
Gales, risk severe; near-constant heavy rain, rising flood risk
How windy? (On the summits)
Southwesterly 45 to 55mph much of the daytime, risk stronger for several hours afternoon, up to 70mph. Powerful gusts in places downslope to north.
Effect of the wind on you?
Difficult conditions most or all day, challenging balance; gusts may knock you over, not just on highest tops. Significant wind chill.
How Wet?
Near-constant rain, incessant and often heavy west
Rain rarely ceasing all day, incessant with prolonged heavy falls on hills facing Cardigan Bay. Breaking up into showers overnight. Very wet underfoot with flooding developing.
Cloud on the hills?
Extensive
Blanket cloud across the hills, to mid-slopes or lower on west coast hills. Highest cloud base toward north of Ogwen valley, at times above 700m.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast and dull. Poor visibility.
How Cold? (at 900m)
7C, beginning to drop afternoon then quite suddenly after nightfall towards 3C. Wind chill feeling like -7C in exposure on higher areas.
Freezing Level
Rising from overnight, staying above freezing to the tops all daytime. May then lower overnight onto or just above highest tops.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 2nd December 2025
Last updated
Sun 30th Nov 25 at
4:24PM
How windy? (On the summits)
Southwesterly 25-30mph, at times squally gusts 35mph.
Effect of the wind on you?
Breezy, at times more blustery over tops, starting to affect comfortable walking and balance on ridges. Marked wind chill.
How Wet?
Frequent hail showers west; flooding
Showery bursts coming inland from Cardigan Bay, with hail, at times snow falling on highest tops; chance isolated thunder. More often dry eastern hills. Wet underfoot, streams in spate, possible flooding after previous rain.
Cloud on the hills?
Mostly tops and western slopes
Often covering western hills, bases varied above 600 to 800m, lowest and most persistent near west coast up to Llyn peninsula. Best breaks toward northeast from Ogwen and hills around Bala/Berwyn.
Chance of cloud free summits?
30% west, to 60% inland/north/east.
Sunshine and air clarity?
Glimpses of sun mostly toward east and north, where visibility often very good. Reduced to poor at times in showers.
How Cold? (at 900m)
1 or 2C. Wind chill feeling like -5 to -8C.
Freezing Level
Just above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 3rd December 2025
Last updated
Sun 30th Nov 25 at
4:24PM
How windy? (On the summits)
Southwesterly 25-30mph, some stronger gusts in exposure.
Effect of the wind on you?
Comfort of walking affected, particularly in exposure where conditions will be more strenuous. Feeling cool.
How Wet?
Showers onto western slopes
Frequent showers onto high tops and western slopes facing the Lleyn Peninsula and Cardigan Bay; showers tending to merge into areas of rain afternoon. Substantially dry all day Carneddau and east Wales.
Cloud on the hills?
Covering high tops and western slopes
Shrouding the high tops with bases as low as 600m on slopes facing Cardigan Bay. More patchy with high bases east Wales. A rising trend late in the day with some breaks off eastern tops.
Chance of cloud free summits?
20%, rising to 50% east
Sunshine and air clarity?
Glimpses of sun east Wales, increasingly frequent later; likely overcast west. Very good visibility.
How Cold? (at 900m)
1 or 2C. Feeling like -10C in direct wind.
Freezing Level
Just above the highest tops
Planning Outlook
A risk of local flooding remains on Tuesday in Wales and the Lake district following Monday's heavy rain. Areas of low pressure circulating to the west and north will dominate the weather pattern in the week ahead, bringing generally unsettled weather. Temperatures near average - higher mountains near or just below freezing point likely for the remainder of the week. Often showery and cloudy in the west with broader bands of rain regularly passing east. Wind speed likely to vary though often quite strong with risk of gales coming and going. First indications suggest unsettled weather will remain dominant into the weekend.