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.
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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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.
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
Monday 21st September 2026
Last updated
Sun 20th Sep 26 at
4:29PM
Summary for all mountain areas
Warm and humid air across the country brings low cloud shrouding hills extensively, foggy to some lower elevations in the west. Some rain moves east across Scotland then generally damp air with fairly persistent drizzle over western hills. Strongest winds toward northern Scotland, gusty not just on highest tops.
Headline for Eryri / Snowdonia National Park
Gusty in places; drizzle, low cloud most persistent west.
How windy? (On the summits)
Westerly 15 to 25mph, strongest gusts toward north in morning, tending to widely ease, in afternoon below 15mph most places, lower speeds mid-Wales.
Effect of the wind on you?
Breezy morning on northern tops, starting to affect ease of walking and balance on exposed tops for a time, but becoming smaller.
How Wet?
A little drizzle
Fine drizzle where in cloud feeling damp, particularly western hills; mostly dry toward the east.
Cloud on the hills?
Lowest cloud fills in west, high tops at times poke out of cloud
Blanket cloud shrouding many western hills, though variable for a few hours from dawn, clearer toward east. Filling in to some lower slopes near Cardigan Bay and tending to drift over hills inland above 600m. Highest tops above 900m near top of cloud sheet, may poke above at times. Best breaks remain from Carneddau and toward east Wales.
Chance of cloud free summits?
20% west coast, to 50% east.
Sunshine and air clarity?
Some sun mostly in east and at times northernmost areas, in places may emerge into sunshine and clear air if above cloud, but staying misty poor visibility lower down especially west coastal areas.
How Cold? (at 900m)
12 to 14C, little change into night; quite humid.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 22nd September 2026
Last updated
Sun 20th Sep 26 at
4:29PM
How windy? (On the summits)
South to southwesterly 10 to 20mph, strongest around higher northwest tops, some gusty areas 25mph.
Effect of the wind on you?
Mostly small, but locally gusty which may feel more noticeable on exposed ridges.
How Wet?
Damp air, drizzle mostly west
Patchy drizzle mostly west coastal hills, feeling generally damp where in cloud. More often dry toward the north and east.
Cloud on the hills?
Low cloud most persistent near coast
Varied cloud and fog banks from dawn, covering hills and in some valleys; highest summits may be above cloud early in day. Banks tend to drift higher up and gradually thin, best north and east. Low cloud likely to linger west coast.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Largely cloudy, misty or hazy; some sun breaking through north and east, also some sun and clear air possible for a time on high tops above cloud.
How Cold? (at 900m)
11 or 12C, humid; little change into evening and night.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 23rd September 2026
Last updated
Sun 20th Sep 26 at
4:29PM
How windy? (On the summits)
Southwesterly 10-20mph, trending northwesterly, strengthening to 20-25mph, or briefly stronger over tops.
Effect of the wind on you?
Becoming blustery over the high tops, walking briefly impeded afternoon.
How Wet?
Morning rain, clearing afternoon
Drizzly on high terrain in the early hours, patchy rain around, which may become more frequent for a few hours. Through afternoon, rain clears away to the east to become dry.
Cloud on the hills?
Fairly extensive morning, well-clearing
Most terrain above 600m shrouded much of morning, a few breaks but also more extensive for a time with ragged patches to forest canopies. Through afternoon, cloud lifts, and breaks up, little remaining by evening.
Chance of cloud free summits?
20%, rising to 80% through afternoon
Sunshine and air clarity?
Glimpses of sun, breaking out afternoon, mostly sunny by late in the day. Visibility becomes excellent as rain breaks.
How Cold? (at 900m)
10C through morning, then cooling, to finish near 7C. Feeling just above 0C in strongest wind.
Freezing Level
Above the summits.
Planning Outlook
Rain affects western Scotland on Tuesday, patchier rain extending eastward. Then into Wednesday, a heavier swathe of rain moves east, more likely over England & Wales, clearing from the west leaving a few showers. South-southwesterly winds increase again on Thursday and rain may move into western Scotland, but elsewhere is likely dry. A variable outlook continues into next weekend and just beyond with high pressure building from the south at times with fairly warm and dry conditions, but some Atlantic systems still pass to the north bringing occasional rain and showers toward western Scotland at least. A trend toward drier conditions more widely around the change of month.