Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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, 12 to 16C 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, 12 to 16C 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
Monday 16th June 2025
Last updated
Sun 15th Jun 25 at
4:00PM
Summary for all mountain areas
A front draped over the Highlands brings low cloud and drizzly rain to western areas, heavier rain pushing northwards in the afternoon. Southwesterly winds will strengthen later in Scotland, becoming gales on higher mountains by evening. Dry with sunny spells and cloud clearing the tops in England & Wales.
Headline for Eryri / Snowdonia National Park
Light-moderate breeze until later. Early low cloud largely clearing.
How windy? (On the summits)
West then southwesterly, 15 to 20mph, tending to increase toward evening and into night to 25-30mph.
Effect of the wind on you?
Small most of day, starting to feel more blustery toward dusk, affecting balance on exposed ridges.
How Wet?
Rain unlikely
Possibly a little fine misty drizzle in cloud near to coast in morning.
Cloud on the hills?
Low cloud mostly breaking up
Cloud banks above 500-600m in the morning, mostly western areas; patchier and more broken north/east of the A5; high tops may be near top of fog layer. Tending to lift, thin and disperse, slowest to clear on slopes toward Cardigan Bay, patches may linger.
Chance of cloud free summits?
40% rising to 80%
Sunshine and air clarity?
Variable cloud in morning, misty toward coastal slopes, improving to a patchwork of cloud and sun, very good visibility.
How Cold? (at 900m)
11C rising to 13C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 17th June 2025
Last updated
Sun 15th Jun 25 at
4:00PM
How windy? (On the summits)
West to southwesterly 20 to 25mph, may drop less during afternoon.
Effect of the wind on you?
Fairly small, but feeling breezy on exposed tops, may start to affect balance on ridges; becoming less with time.
How Wet?
Drizzly rain develops
Patchy drizzle on western hills becoming more persistent for a time middle of day into afternoon as a weakening front comes in from the north, fading later.
Cloud on the hills?
Fairly extensive, lowest western hills
Risk covering higher areas most of the day, lowest cloud bases toward west coast when rain occurs, from 500-600m upward or brief lower patches. Higher bases Carneddau and Berwyn groups.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Fairly cloudy and some haze west. Glimpses of sun, visibility good further inland and east where below cloud.
How Cold? (at 900m)
10C, quite humid.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 18th June 2025
Last updated
Sun 15th Jun 25 at
4:00PM
How windy? (On the summits)
Westerly 10-15mph.
Effect of the wind on you?
Small
How Wet?
Rain not expected
Cloud on the hills?
Possible patchy cloud or coastal fog
Patchy cloud banks drifting onto some coastal slopes, may be fog on lower slopes for a time. Tending to all thin and disperse, though a chance of fog lingering right along the Cardigan Bay coastline.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Mostly sunny, some fair-weather cloud. Visibility very good, but possibly misty near to the sea.
How Cold? (at 900m)
10C rising to 14C.
Freezing Level
Above the summits
Planning Outlook
Humid southwesterly winds early this week brings low cloud and spells of drizzly rain to western hills. High pressure to the south will tend to expand northwards during midweek, with dry conditions and warm air for all regions, sunshine and fair-weather cloud. Winds becoming light south to southeasterlies later in the week. Uncertainty by next weekend into early the following week, a risk of some rain or showers returning as pressure tends to fall.