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.
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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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.
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 15th September 2026
Last updated
Mon 14th Sep 26 at
4:29PM
Summary for all mountain areas
Clusters of showers over Scotland from dawn, a few dry, bright breaks forming, mostly south, but pulses of showers return too. A band of rain over England and Wales just at dawn soon passes east for a bright window, followed by intermittent rain, driest windows later afternoon. Cool-to-mild and breezy.
Headline for Eryri / Snowdonia National Park
Blustery rain just at first, then showers and dry windows
How windy? (On the summits)
Westerly 20 to 25mph, sometimes 30mph over high tops and possibly 35-40mph just at first. Trending northwesterly later.
Effect of the wind on you?
Often fairly small, though some blustery moments in exposure, particularly from overnight and just around dawn when walking will be strenuous with wind chill.
How Wet?
Pulses of rain
Overnight rain likely clears eastward around dawn. Then pulses of showery rain come and go, brief heavier showers mixed in, dry windows between pulses but a few odd spots of rain here and there too.
Cloud on the hills?
Varying on higher tops
Ragged cloud banks above 600-800m at first, soon mostly confined to 800-900m, but here may come and go for a few hours, some breaks forming at times between showers but then returning over high terrain as showers return.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Patchy sun, mostly eastern areas, a few clearer sky windows but also cloudier periods. Visibility often very good, briefly reduced in showers.
How Cold? (at 900m)
11C at dawn, soon cooling to around 8 or 9C much of the day. Feeling close to or below 0C in wind at first, wind chill effect easing.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 16th September 2026
Last updated
Mon 14th Sep 26 at
4:29PM
How windy? (On the summits)
A gusty northwesterly 25-35mph, lessening somewhat and shifting westerly, later southwesterly 20-25mph.
Effect of the wind on you?
A blustery start, buffeting affecting stability in exposure and feeling chilly. Easing to fairly small effects.
How Wet?
Drizzle, some showers
Drizzly from the Llyn Peninsula towards Carneddau, to lower areas in the early morning, lifting to high terrain afternoon and increasingly breaking up. Some showers too, mostly east Wales, these breaking up and later largely dry.
Cloud on the hills?
Extensive to start, improving
Blanket cloud to at least middle slopes to start, to lower slopes nearest Anglesey. Cloud more broken east of high tops but also misty on some low terrain too. Cloud lifts, to largely 800m and breaking up somewhat, though clinging to high tops.
Chance of cloud free summits?
Rising to 40%
Sunshine and air clarity?
Patchy sun breaks out, most notably on lower slopes, high cloud from the west later. Good visibility.
How Cold? (at 900m)
7 or 8C. Feeling near or below freezing in direct wind early.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 17th September 2026
Last updated
Mon 14th Sep 26 at
4:29PM
How windy? (On the summits)
Westerly 25-30mph, easing towards 20mph for a few hours but also gusty.
Effect of the wind on you?
Blustery in exposure much of the day, buffeting gusts and a chilly feeling.
How Wet?
Scattered showers
A broad area of rain from overnight clears away to the east just around dawn for a day of light scattered showers. Many hills will see extended dry windows and total rainfall amounting to little.
Cloud on the hills?
Caps on summits with breaks
Cloud fairly extensive from overnight will break around sunrise (or perhaps just before), to mostly just passing banks over the highest tops. A few lower patches form here and there around showers.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Mostly sunny on lower slopes. Good visibility, though some haze out over the Irish Sea.
How Cold? (at 900m)
6 or 7C, briefly warmer just at and before dawn. Feeling near freezing in direct wind.
Freezing Level
Above the summits.
Planning Outlook
A brief window of brighter weather on Wednesday, though some scattered showers around and feeling fresher in cooler temperatures. Showers and strong wind return on Thursday, and then the weather stays often unsettled during the next week as westerlies prevail - areas of low pressure passing north of Scotland with frontal systems bringing bands of rain, followed by showers, wettest over western mountains in Scotland. Often windy, sustained periods of gale-force westerly winds over higher terrain; significant wind chill, particularly in the north where temperatures will occasionally approach freezing point on high Scottish tops. A brief window of high pressure may form Saturday into Sunday, and a chance of a window of higher pressure the following week, but confidence is currently low.