Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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
Tuesday 18th August 2026
Last updated
Mon 17th Aug 26 at
4:25PM
Summary for all mountain areas
Fresh-to-strong westerly breezes bring frequent showery rain and drizzle to western Scotland all day, plus patchy rain western England and Wales in the morning, here becoming drier until rain returns by evening. All western tops often in cloud. Some showery rain extends east across the Highlands.
Headline for Eryri / Snowdonia National Park
Blustery, a little rain in morning, high tops often in cloud.
How windy? (On the summits)
Westerly 20 to 30mph, lowest speeds around early afternoon for a few hours.
Effect of the wind on you?
Affecting comfortable walking on higher terrain, at times more strenuous in exposure. Marked wind chill.
How Wet?
A few showers fading
Heavy rain from overnight clears southward around dawn, leaving showery rain continuing on and off for a few hours, becoming scattered light showers. Late evening onward, more persistent rain returns from southwest.
Cloud on the hills?
Often capping western tops
Cloud covering most higher slopes above 600-700m from dawn, base tending to lift but likely to cap higher slopes much of day above 800m toward west; breaks east.
Chance of cloud free summits?
30% west rising to 60% inland
Sunshine and air clarity?
Fairly cloudy west, glimpses of sun east. Visibility becoming very good below cloud.
How Cold? (at 900m)
9 or 10C, trending cooler later in day. Feeling near to 0C in the stronger wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 19th August 2026
Last updated
Mon 17th Aug 26 at
4:25PM
How windy? (On the summits)
Southwesterly 20 to 30mph, tending to increase later in day to often 30-35mph.
Effect of the wind on you?
Breezy over high terrain, affecting comfortable walking at times, risk buffeting more often later; feeling rather cool.
How Wet?
Showers
Showery rain most frequent in western areas in the morning, but scattered mostly brief bursts of rain passing eastwards during the day. Later in day risk of more prolonged rain developing in the west.
Cloud on the hills?
Lifting with breaks toward tops
Covering many western tops above 600-800m in the morning; base tending to rise, breaks forming toward upper slopes, but patches may come and go on tops.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Sun mostly east in the morning, otherwise often cloudy; some sun later near coast. Visibility mostly very good.
How Cold? (at 900m)
7 to 9C, coolest west, little change all day. Feeling near freezing directly in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 20th August 2026
Last updated
Mon 17th Aug 26 at
4:25PM
How windy? (On the summits)
Westerly turning northerly, speed likely varying 15 to 30mph, likely strongest later in day.
Effect of the wind on you?
Fairly small for periods, but may start to affect comfortable walking and feeling noticeably cool where exposed on tops.
How Wet?
Frequent rain, some heavy
Rain on and off much of the day, some heavy bursts forming increasingly, local thundery downpours in afternoon.
Cloud on the hills?
Fairly extensive
Often covering many hills above 600 to 800m, lowest in north and during rain. Some higher breaks may form inland.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Mostly cloudy, rare sun breaking through. Visibility good at times, but poor in rain.
How Cold? (at 900m)
7 to 9C. Feeling close to freezing in stronger wind.
Freezing Level
Above the summits.
Planning Outlook
Low pressure dominates across Britain into midweek, bringing showery conditions widely, some more organised bands of rain at times. Some heavy and thundery downpours forming, mostly into the afternoons, becoming focused further south with time. Fresh westerly winds turning northerly and temperature lowering later this week, dropping close to freezing on high Scottish tops by Friday and frost may occur in Highland glens over a couple of nights. More often dry with rare lighter showers over the weekend as higher pressure builds. Strengthening south-southwesterly winds into early next week with a risk of rain returning from the west, but warmer temperatures are likely.