Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
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
Thursday 13th November 2025
Last updated
Wed 12th Nov 25 at
4:30PM
Summary for all mountain areas
Cold northeasterlies for the Highlands, gale-force over mountains early in day. Snow mostly in northern areas. A slow-moving swathe of rain for southern Scotland and northern England, heavy at times. Previous rain eases to patchy light rain in Wales, but beware of flooding - staying mild here.
Headline for Eryri / Snowdonia National Park
Patchy rain, low cloud. Wind easing.
How windy? (On the summits)
Southwesterly 25-35mph, lessening afternoon, a marked lull from dusk, but will strengthen E'ly 30-50mph into night.
Effect of the wind on you?
Walking strenuous in exposure in morning, conditions tend to ease through afternoon. Beware deteriorating again into night.
How Wet?
Showery rain, may ease; flooding
Very wet ground and flooding following heavy rain Wednesday and overnight. Periods of showery rain through morning, these tending ease as the day goes though a risk of returning for periods, most likely on northern slopes.
Cloud on the hills?
Mostly high tops and west slopes
Fog will cling to higher summits and down to the middle slopes facing Cardigan Bay likely all day. Banks with higher bases will drift towards Carneddau and east Wales, at times clearer here.
Chance of cloud free summits?
10%; 40% east Wales
Sunshine and air clarity?
Largely cloudy, glimpses of sun east. Visibility very good, though locally poor in rain.
How Cold? (at 900m)
7C; tending to lower to 4C into evening. Feeling near or below freezing in wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 14th November 2025
Last updated
Wed 12th Nov 25 at
4:30PM
How windy? (On the summits)
Easterly, 45 to 60mph, later 70mph, ferocious gusts including passes and in places downslope to west of high terrain.
Effect of the wind on you?
Difficult conditions across the mountains, gusts likely to knock you over, not just on highest terrain. Significant wind chill.
How Wet?
Prolonged rain setting in, flooding
A slow-moving extensive belt of rain, heaviest sustained falls over eastern hills. Patchier northwestern areas in morning. Turning to sleet or wet snow higher tops. Saturated ground, expect flooding, becoming significant later.
Cloud on the hills?
Extensive, lowest east
Likely to cover the hills widely, lowest bases 400-500m eastern areas, mostly 600m further west, some local higher breaks toward west coast.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Overcast and dull. Visibility poor due to rain.
How Cold? (at 900m)
2 or 3C, dropping to 1C later (small change with height above 700m). Wind chill feeling like -10 to -15C.
Freezing Level
Dropping close to freezing point over higher slopes as the day progresses.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 15th November 2025
Last updated
Wed 12th Nov 25 at
4:30PM
How windy? (On the summits)
Easterly 50-60mph from dawn, powerful gusts downslope to west. Tending to gradually decrease, some uncertainty.
Effect of the wind on you?
Widely difficult, turbulent gusts on some slopes may continue all day. Some improvement possible with time.
How Wet?
Rain fading out, flooding
Continuing rain from overnight through dawn, but intensity easing and gradually becoming patchier during the day, leaving occasional mostly light rain afternoon. Considerable flooding expected.
Cloud on the hills?
Extensive, rising with some breaks
Covering the hills widely, lowest bases in eastern areas around 500-600m, mostly lifting above 800m in west. May tend to lift and break gradually, best in west.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Overcast, some brighter skies may develop toward west coast. Hazy, visibility improving as rain eases.
How Cold? (at 900m)
1 or 2C (little change with height above 700m). Wind chill feeling like -15C in exposure.
Freezing Level
Just above freezing on upper slopes.
Planning Outlook
High rainfall with significant flooding expected for Wales by the end of this week, risk flooding too in Peak District. Drier overall across the Highlands. Strong to gale force easterlies later this week, then northerlies are expected to dominate onward into next week. Colder air extends to all areas, staying below freezing over higher mountains most likely throughout next week to 10 days. Some accumulations of snow over Scottish mountains, initially mostly northern areas, possibly more widely across all mountain areas during next week - Tuesday-Wednesday in particular, but lower confidence of forecast detail by then.