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.
Cool to mild
Air temperature 8 to 12C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
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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.
Cool to mild
Air temperature 8 to 12C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 10th June 2025
Last updated
Mon 9th Jun 25 at
4:30PM
Summary for all mountain areas
A fine day developing as overnight rain fades and cloud banks lift and break to reveal patchy sunshine. Early strong breezes easing gradually. Patchy cloud may come and go on higher western tops in the Highlands. Slower to improve in south Wales.
Headline for Eryri / Snowdonia National Park
Strong breeze easing. Drizzly low cloud at first, improving.
How windy? (On the summits)
Westerly 30mph around dawn, or stronger just before - gusts over 40mph. Soon dropping during morning to 20-25mph, then 10-15mph afternoon, or less later; turning south-southwesterly into night.
Effect of the wind on you?
Walking impeded at first - stability may be challenged on exposed ridges - feeling chilly, but improving, becoming small during afternoon.
How Wet?
Damp at first, soon dry
Remnants of overnight rain gives patches of drizzle at first, mostly western hills, becoming confined toward mid-Wales, soon widely fading to leave a dry day.
Cloud on the hills?
Extensive early, lifting and breaking
Widespread from dawn, down to some lower slopes western hills. Tending to thin and break during the morning, leaving patches confined to higher slopes, but largely clearing by middle of day.
Chance of cloud free summits?
10% early morning, rising to 90% afternoon.
Sunshine and air clarity?
Cloudy early morning, misty start, but improving as cloud starts to break, leaving patchwork of sun and cloud into afternoon, visibility becoming excellent.
How Cold? (at 900m)
7C rising to 10C. Little change, or slight rise further after dark.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 11th June 2025
Last updated
Mon 9th Jun 25 at
4:30PM
How windy? (On the summits)
Southerly 15-20mph. Gradually shifting southeasterly, rising towards a gusty 30mph evening and into night.
Effect of the wind on you?
Fairly small most of the day, though gusty at times. Walking impeded later with buffeting gusts.
How Wet?
Dry during daylight, chance rain late
Chance a few spots of rain may quickly come and go by dusk into night.
Cloud on the hills?
Morning patchy cloud isolates to high tops
Intermittent cloud banks shroud high terrain soon after dawn, may be more persistent on southern aspects toward mid-Wales. Peaks near and north of Ogwen valley largely clear. Gradually lifting and breaking to only high tops afternoon.
Chance of cloud free summits?
Becoming 80%
Sunshine and air clarity?
Glimpses of sun becoming frequent sun, best of sun northern low slopes. Visibility becoming excellent.
How Cold? (at 900m)
11C rising to 16C. Little drop in temperature, if any, into night.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 12th June 2025
Last updated
Mon 9th Jun 25 at
4:30PM
How windy? (On the summits)
Southeast then southerly, 25 to 40mph, risk gusts 50mph for a time; speeds may ease, but gusty around heavy rain.
Effect of the wind on you?
Very blustery, walking arduous on high terrain, affecting balance on exposed tops and ridges, sudden buffeting gusts.
How Wet?
Thunderstorms likely soon develop
Sporadic bursts of rain from elevated cloud from dawn. Increasing threat during morning of widespread heavy rain developing from the south, lasting several hours, risk thunderstorms; may clear northward later in daytime.
Cloud on the hills?
Lowering, varied patches in rain
Most cloud initially above the hills, but as rain develops, cloud filling in across the hills, in places patches from forest canopies upward during and after heavy bursts. May improve later in daytime.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Mainly overcast, hazy, poor visibility in rain. Some sun may break through later in the day, visibility may improve.
How Cold? (at 900m)
14C from dawn, but then little change; small variation with height in morning.
Freezing Level
Above the summits
Planning Outlook
Much warmer and feeling humid as winds shift southerly through Wednesday. Low pressure to the west and a front pushing in brings a risk of thunderstorms on Thursday, soonest in Wales, advancing northeastwards over England and Scotland likely afternoon into evening - some uncertainty of timing. Low pressure is likely to linger later week into weekend - initially staying warm and humid, bringing an ongoing risk of thundery downpours, mixed with sunnier spells. Likely cooler and windier with time over the weekend. Southwesterlies then prevailing with rain at times, most over western mountains into early next week, but a trend toward higher pressure building from the south with drier conditions emerging.