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.
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.
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.
Flooding
Fast-flowing rivers and streams. Some routes may be impassable due to flooding.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 12th November 2025
Last updated
Tue 11th Nov 25 at
4:27PM
Summary for all mountain areas
Northern areas of the Highlands generally wet, the rain only gradually breaking up. Showers for the southwest Highlands. Dropping below freezing on northern tops later. Heavy rain sets in again across Wales, already flooding expected after previous rain. Mostly dry for much of Pennines, Lakes & south Scotland.
Headline for Eryri / Snowdonia National Park
Patchy light rain; increasingly wet and windy afternoon.
How windy? (On the summits)
South-southwesterly 20-30mph, briefly less for a time, but strengthening later in day, 40mph into evening, up to 50mph higher tops into first part of the night.
Effect of the wind on you?
Risk blustery over exposed terrain, though may be fairly small for periods. Deteriorating toward and beyond dusk.
How Wet?
Patchy drizzle, then heavier rain; flooding
Very wet underfoot with streams in spate and flooding following previous rain. Some drizzly rain onto western hills, then with time middle of day onward more persistent then heavier rain returning - prolonged heavy falls later afternoon into evening and night - risk more significant flooding developing.
Cloud on the hills?
Fairly extensive, some breaks north
Banks of cloud from lower elevations upward in the morning, may linger particularly western hills. Breaks mostly Carneddau. Lowering widely in rain.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Overcast, varied layers of cloud. Misty areas may linger, locally good visibility mainly toward north.
How Cold? (at 900m)
8C. Feeling like 0C or below if in stronger wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 13th November 2025
Last updated
Tue 11th Nov 25 at
4:27PM
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
Tue 11th Nov 25 at
4:27PM
How windy? (On the summits)
Easterly, 45 to 60mph, risk 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, flooding
A slow-moving extensive belt of rain is likely to affect Wales all day, heaviest sustained falls over eastern hills. Saturated ground, expect flooding, risk significant by later in the day.
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)
3C (small change with height above 700m). Wind chill feeling like -10 to -15C.
Freezing Level
Above the summits.
Planning Outlook
High rainfall totals bring concerns for flooding again, risk more significant in Wales in the days ahead. A marked contrast of temperature north to south this week, but colder air to the north becomes more widespread into the weekend and early next week, leaving higher terrain below freezing for a run of days and some accumulating snow, mostly focused over northern Scottish mountains. Wind will vary, then become east-northeasterlies, gales Friday into Saturday, then a possible brief lull before turning northerly on Sunday. More uncertain outlook further into next week, but some further unsettled areas of low pressure currently show signs of remaining nearby - but often within a colder weather regime.