Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
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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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
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 25th August 2026
Last updated
Mon 24th Aug 26 at
4:26PM
Summary for all mountain areas
Early cloud and drizzle in northeast England and east Scotland. Cloud lifts, sun breaking out; cloud caps cling to high east Scotland tops, a little light rain passing westward. Wales and west parts of England and Scotland largely dry with little hill cloud. Wind strengthens into night in England and Wales.
Headline for Eryri / Snowdonia National Park
Breezy, often sunny; rising risk rain and stronger wind into night
How windy? (On the summits)
East-southeasterly 20 to 30mph, trending towards the lower end of the rage for a time. Strong gusts in the morning over tops and downslope approach 40mph or stronger.
Effect of the wind on you?
Fairly small much of the day, but blustery on high terrain, ease of walking becoming affected, particularly in early gusts which will impact balance.
How Wet?
Rain unlikely
Chance of a little fine drizzle where in early cloud banks in east, but soon dry. Afternoon into evening, possibly an odd burst of rain moving up from the south, increasing chance into night.
Cloud on the hills?
Little or none
Patchy cloud banks on some eastern slopes for a few hours from dawn will all clear.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Sun and thin high cloud. Visibility very good west, slight haze looking eastward.
How Cold? (at 900m)
9C rising to 15C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 26th August 2026
Last updated
Mon 24th Aug 26 at
4:26PM
How windy? (On the summits)
Southeasterly 25-30mph and gusty early in day, a gradual easing tendency.
Effect of the wind on you?
Early gustiness tending to ease to become fairly small.
How Wet?
Early rain, risk thundery bursts later
A risk of steady rain and drizzle over a few early hours, tending to clear northwards. During afternoon into evening, risk of heavier bursts of rain forming with possible thunder; timing of any rain is uncertain.
Cloud on the hills?
Fairly extensive, lifting, but variable
Cloud fairly widely shrouding hills above 500-600m from dawn, some lower banks toward east. Tending to rise and break, but patches may cling around some high tops, and variably lower where rain occurs.
Chance of cloud free summits?
20% rising to 50%
Sunshine and air clarity?
Occasional weak sun through high cloud, often overcast. Hazy start, visibility improving to be good when dry.
How Cold? (at 900m)
12C rising to 14C, quite humid. Feeling like 5C in the wind at first.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 27th August 2026
Last updated
Mon 24th Aug 26 at
4:26PM
How windy? (On the summits)
Southeasterly 15-25mph, shifting southeasterly with time; quite gusty much of the day.
Effect of the wind on you?
Fairly small, but nuisance gusts affect walking at times through much of the day.
How Wet?
Often raining, thundery bursts
Several hours of rain from dawn, heavy, thundery falls mixed in. Tending to break into showers with time, but localised thunderstorms could redevelop afternoon.
Cloud on the hills?
Fairly extensive, local improvement
Cloud from at least middle slopes upward in the morning, and likely lower with patches into valleys during rain. Lifting, but slopes towards Cardigan Bay will be slow to clear above 700-800m, and high tops may not clear.
Chance of cloud free summits?
10% rising to 40%
Sunshine and air clarity?
Overcast and often dull in the morning with poor visibility, breaking into patchy sunshine with very good visibility out of showers.
How Cold? (at 900m)
11 to 13C, perhaps warmest in the morning; fluctuating by several degrees around showers.
Freezing Level
Above the summits.
Planning Outlook
Low pressure to the south will develop and drift across Britain into the second half of this week bringing increasingly wet, warm, and humid conditions widely. Areas of rain will drift northward during Wednesday, possibly thundery showers forming over England & Wales. Heavy and thundery rain likely affects England, Wales & southern Scotland on Thursday-Friday, potentially prolonged heavy falls bringing a risk of flooding locally. Northwest Scotland likely driest. The eastern Highlands often covered in low cloud. Strong gusty easterly winds prevail for a few days through midweek. Into the weekend it remains unsettled with areas of rain and heavy showers, plus cooler northwesterly winds developing.