Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday'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.
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.
Hazy, some fog banks
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Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
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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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.
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.
Hazy, some fog banks
Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
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
Tuesday 29th September 2026
Last updated
Mon 28th Sep 26 at
4:30PM
Summary for all mountain areas
A windy start strengthens to widespread gales, powerful gusts not just on high terrain. Feeling chilly despite mild-to-warm temperatures, increasingly humid too. Some patchy rain and cloud moves north through Wales into England and later Scotland; northwest Scotland bright and dry well into the day.
Headline for Eryri / Snowdonia National Park
Wind to gale-force; some rain/drizzle, cloud thinning
How windy? (On the summits)
Southeasterly 35-40mph to start, turbulent gusts around high tops, passes and downslope. Strengthening, sustained speeds later to 50mph over tops, further strengthening overnight, strongest gusts to 65mph+.
Effect of the wind on you?
Soon challenging walking conditions on exposed terrain, but sudden buffeting also to some lower elevations. Most powerful gusts later knocking you around. Significant wind chill.
How Wet?
Some drizzle, rain on and off
Spots of rain from time to time drift from the south, drizzly where in cloud; some broader pulses of rain are possible, some extended falls to the south and east. Evening into night, rain will set in from the west.
Cloud on the hills?
Most persistent eastern hills
Banks of cloud most persistent over east and mid Wales, may cling around tops much of the day. Higher and more broken cloud north and northwestern areas. Will thin and disperse somewhat afternoon, though patches may continue to cling to high tops.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Some glimpses of weak sun through high cloud mostly northwest coastal areas, and perhaps more broadly later in the day. Poor visibility with a haze around, improving somewhat afternoon where cloud breaks.
How Cold? (at 900m)
10C just at dawn, soon rising, to reach 13 or 14C afternoon. Feeling humid, and only slight drop onward into night. Feeling just above freezing in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 30th September 2026
Last updated
Mon 28th Sep 26 at
4:30PM
How windy? (On the summits)
Southerly 30 to 40mph, at times 50mph over higher mountains particularly toward the west; generally lessening later.
Effect of the wind on you?
Strenuous walking conditions, more challenging in places on exposed high terrain with frequent buffeting.
How Wet?
Frequent bursts of rain west
A band of heavy rain from dawn soon clears northeastward, but clusters of heavy showers follow, merging to frequent rain west coastal areas, risk of thunder.
Cloud on the hills?
Often capping tops, breaks north/east
Cloud base lifting early morning with some breaks to upper slopes, but will often cap west coastal tops and vary in height all day; best breaks Carneddau to Bala area.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Intermittent sun breaking through mostly northern areas. Visibility varying, at times very good, but hazier coasts and reducing in rain.
How Cold? (at 900m)
Humid 13C or above from dawn, dropping during the day to a fresher 9C. Feeling near/below freezing in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 1st October 2026
Last updated
Mon 28th Sep 26 at
4:30PM
How windy? (On the summits)
Southwesterly 20-30mph, some gustiness to start. Trending stronger later, and particularly overnight.
Effect of the wind on you?
At times blustery in exposure with some buffeting in gusts and wind chill. Deteriorating somewhat overnight.
How Wet?
Showers generally easing
From dawn, showers streaming onto the mountains from the southwest, drizzly on the tops and towards Cardigan Bay. Drizzle will fade and showers less frequent with time, little rain expected near/east of Carneddau later.
Cloud on the hills?
Clinging to high west terrain
Fairly extensive from 600-700m upward west slopes, lower in showers. Soon beginning to lift, some variability, clearing off Carneddau first. Banks likely cling to Snowdon with a few lower patches towards Cardigan Bay.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Patchy sunshine, extended sunny spells breaking out east of high terrain. Good visibility, a little haze building.
How Cold? (at 900m)
8C.
Freezing Level
Above the summits.
Planning Outlook
A band of rain moves northeast through early Wednesday, leaving fresher and blustery south-southwesterlies into Wednesday and Thursday, showery in the west but often bright between showers, particularly eastern areas. Friday will be a wetter day again, the rain quite frequent with extensive cloud over western hill groups and quite windy in England and Scotland. On Saturday, higher pressure tends to expand from the south, bringing more settled weather to England and Wales; temperatures generally mild, some cool nights when skies are clear. Scotland will stay cloudier and windier, particularly in northern areas early next week, some drizzle in the northwest and occasionally broader bands of rain slipping eastward.