Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday'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.
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.
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 13th September 2026
Last updated
Sat 12th Sep 26 at
4:01PM
Summary for all mountain areas
A fine day for most places with light winds. Varied cloud around some hill slopes early in the day tending to lift and break, sunny spells. Risk of more cloud lingering over hills in Wales, some rain and drizzle in the south as a front stays nearby. Southwesterly breezes increase later western Scotland.
Headline for Eryri / Snowdonia National Park
Early drizzle, low cloud, tending to lift; wind drops light.
How windy? (On the summits)
Westerly 15-25mph at dawn, strongest toward mid-Wales, easing during morning, to 10mph by middle of day, later southwesterly. Rising again from dusk into night to 25mph.
Effect of the wind on you?
Feeling chilly in a fresh breeze early morning, becoming small most of day.
How Wet?
Patchy drizzly rain fades, then dry until late
A little light rain or drizzle mostly on hills nearer the coast early in the day, but fading to be generally dry. By evening onward, drizzly rain tending to drift back in from the south mainly over western hills.
Cloud on the hills?
Low cloud in morning lifts and breaks to patches on tops
Fairly extensive from dawn into morning, varied to some lower slopes in western areas; some tops may emerge between cloud banks at times. Tending to thin and lift above 800m during morning, some patches come and go on high tops afternoon, mainly west. Into night, low cloud tending to fill in again from southwest.
Chance of cloud free summits?
20% rising to 50% west, 80% east.
Sunshine and air clarity?
Glimpses of sun, breaking through best in east during morning, then some sunnier spells near coast afternoon. Some misty slopes, but visibility becoming excellent out of cloud.
How Cold? (at 900m)
9 to 11C, little change all day, then rising slightly higher onward into night. Feeling like 3C in early wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 14th September 2026
Last updated
Sat 12th Sep 26 at
4:01PM
How windy? (On the summits)
Southwesterly 30-40mph likely rising to 50mph, some notable strong gusts high passes and some downslopes.
Effect of the wind on you?
Frequent buffeting over the hills, very gusty in places affecting stability, not just highest terrain. Marked chill factor despite mild air.
How Wet?
Rain and drizzle, some heavier
Drizzle and light rain in the west from dawn, becoming steady rain over western hills much of the day, occasional heavier falls, more constant with time. Periods of heavy rain also onward into night.
Cloud on the hills?
Extensive very low cloud
Blanket cloud shrouding the hills, from lower slopes upward toward Cardigan Bay, extensive above 400-500m even well inland, but some higher breaks locally north Carneddau to Bala/Berwyn groups.
Chance of cloud free summits?
Below 10%
Sunshine and air clarity?
Overcast and dull, misty or murky to lower slopes in west, local brighter areas north and easternmost areas.
How Cold? (at 900m)
14C, humid, little change all day, then starting to lower slightly into night. Feeling like 0 to 3C directly in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 15th September 2026
Last updated
Sat 12th Sep 26 at
4:01PM
How windy? (On the summits)
Westerly 25 to 30mph, possibly 35-40mph just at first.
Effect of the wind on you?
Blustery across the mountains, affecting comfortable walking with some buffeting in exposure and marked wind chill.
How Wet?
Intermittent rain
Occasional showery rain, most common on western hills in the morning, brief heavier showers passing eastward during the day, may become more frequent.
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
Chance of cloud free summits?
40%
Sunshine and air clarity?
Occasional sun mostly toward east. Visibility often very good, briefly reduced in showers.
How Cold? (at 900m)
8 to 11C, mildest early in day, trending cooler during daytime. Feeling close to 0C in the wind.
Freezing Level
Above the summits.
Planning Outlook
Staying unsettled during the next week to 10 days as westerlies prevail - areas of low pressure passing north of Scotland with frontal systems bringing frequent rain, wettest over western mountains in Scotland. Often windy, gale-force westerly winds for periods over higher terrain. Fairly warm and humid on Monday, then on the cooler side for several days, with considerable wind chill on the mountains. Higher pressure and better weather tends to expand further north later in month.