Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday's Forecast
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
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 5 to 10C 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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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
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 5 to 10C 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
Sunday 23rd August 2026
Last updated
Sat 22nd Aug 26 at
4:00PM
Summary for all mountain areas
A fine day for most places with light winds. Patchy cloud around some hill slopes early in the day will lift to leave many summits clear, but cloud banks are likely to persist on west coastal tops in Scotland, a little drizzle here in the morning, breezier too in the far northwest.
Headline for Eryri / Snowdonia National Park
Early cloud northern hills tends to lift, largely dry.
How windy? (On the summits)
Northerly at first then variable mostly less than 10mph, some upslope breezes forming.
Effect of the wind on you?
Negligible.
How Wet?
Soon dry
A little fine drizzle in cloud on northern slopes from dawn, soon fading to be dry.
Cloud on the hills?
Mostly tops in north in morning
Patchy cloud banks on some northern hills early in the day, also locally mist on some low slopes inland. Becoming confined to patches around high summits in morning, then dispersing or lifting above tops.
Chance of cloud free summits?
60%, rising to 90% afternoon.
Sunshine and air clarity?
Cloudy morning toward north coasts, patchy cloud and sun inland and south, becoming sunnier near coasts afternoon. Very good visibility.
How Cold? (at 900m)
7C rising to 10 to 12C, warmest towards mid-Wales.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 24th August 2026
Last updated
Sat 22nd Aug 26 at
4:00PM
How windy? (On the summits)
Southeast then easterly 10-25mph: trending from low to high speeds through the day, further rising overnight.
Effect of the wind on you?
Starting small, but the breeze notably picks up in exposure through the day.
How Wet?
No rain expected
Cloud on the hills?
Little or none
A little patchy mist on low slopes in the morning, soon lifting and dissipating for clear hills.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Mostly sunny, some thin high cloud builds with time. Good visibility but some haze around.
How Cold? (at 900m)
10 to 12C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 25th August 2026
Last updated
Sat 22nd Aug 26 at
4:00PM
How windy? (On the summits)
Easterly 20 to 30mph.
Effect of the wind on you?
Fairly small but feeling breezy over higher terrain, in places may start to affect balance on exposed tops and ridges.
How Wet?
Rain unlikely most of day
Chance of a little fine drizzle where in early cloud banks in east. Late in the day, or into night, possibly an odd burst of rain moving up from the south.
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 13C.
Freezing Level
Above the summits.
Planning Outlook
A fine start to the week with high pressure nearby, but easterly breezes will tend to strengthe. Most places dry through Monday and Tuesday, but generally deteriorating from the south into midweek as low pressure moves in from the south, patchy rain will increasingly spread northward with some local stronger wind. Broadly unsettled as next weekend approaches with bands of heavy rain forming mixed with showery bursts at times, but fairly warm and somewhat humid. Wind speed and direction likely to vary considerably day-to-day.