Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday'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
Friday 11th September 2026
Last updated
Thu 10th Sep 26 at
4:30PM
Summary for all mountain areas
Fresh westerly winds will be strongest in northern Scotland, speeds lessening a little during the day, but feeling cool in exposure on tops. Light showers mainly in western Scotland tends to fade. Cloud often capping western tops, breaks forming higher with time; clearer hills toward east.
Headline for Eryri / Snowdonia National Park
Breeze eases. Some early dampness, cloud tends to lift.
How windy? (On the summits)
West-northwesterly 20-25mph to start, easing, to 10-15mph afternoon. Starting to increase again into night, later toward 30-40mph.
Effect of the wind on you?
Blustery and cool in exposure early in day, becoming mostly small. Tending to deteriorate onward through the night.
How Wet?
Soon dry
A little drizzle over the high tops in cloud in the early morning, soon fading for dry hills.
Cloud on the hills?
Fairly extensive early, improving
Most high terrain starts in cloud, bases towards middle slopes from Llyn Peninsula to Carneddau. Cloud will lift with time, breaks forming, soonest Berwyn group and increasingly widely. High Snowdon group summits will be slowest to clear into afternoon.
Chance of cloud free summits?
40% rising to 80% afternoon
Sunshine and air clarity?
Sunshine increasingly breaks out. Good visibility, though a haze building.
How Cold? (at 900m)
8 or 9C, little change all day. Feeling near freezing at first on tops in wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 12th September 2026
Last updated
Thu 10th Sep 26 at
4:30PM
How windy? (On the summits)
Southwesterly, rising through dawn to 40-55mph, up to 60mph higher northern tops during the day, lessening into evening.
Effect of the wind on you?
Challenging conditions with powerful gusts to some low levels; walking soon difficult on exposed tops, lasting most of day.
How Wet?
Heavy rain develops, sets in
Rain initially patchy, but becomes more persistent northwestern Eryri in the morning, then more widely, heavier falls developing, setting in continuously, only likely fading from north during evening.
Cloud on the hills?
Increasingly extensive
Banks of low cloud over hills toward the west in the morning, some early breaks more north and eastern groups. Filling in and lowering widely in rain.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Overcast, increasingly dull. Hazy, then widely poor visibility in rain
How Cold? (at 900m)
10C rising to 12C. Feeling like -2 to -5C directly in wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 13th September 2026
Last updated
Thu 10th Sep 26 at
4:30PM
How windy? (On the summits)
West-northwest 20-25mph at dawn, easing during morning, to 10mph by middle of day, later SW'ly. Rising again by evening.
Effect of the wind on you?
Feeling chilly in a fresh breeze early morning, becoming small most of day.
How Wet?
Soon substantially dry
A little light rain or drizzle on northwest hills nearer the coast at first, but likely to fade.
Cloud on the hills?
Low cloud in morning lifts and breaks
Cloud banks fairly extensive from dawn into morning, varied to some lower slopes in western areas; highest tops may be near top of the cloud layer for a time. Tending to thin and lift, to leave odd patches on high tops afternoon.
Chance of cloud free summits?
30% rising to 80%
Sunshine and air clarity?
Variable sunshine and cloud, sunnier near coast afternoon. Visibility soon excellent.
How Cold? (at 900m)
7C rising to 10C during day, may rise a degree or so more into evening and night. Feeling near freezing in early wind.
Freezing Level
Above the summits.
Planning Outlook
Changeable west-southwesterlies prevail through mid September; often windy, gale-force winds for periods over higher terrain. An active frontal system sweeps southeastward on Saturday with a sustained fall of rain, accompanied by upland gales for most places. Improving for better weather on Sunday, then wind and rain returns into Monday, staying showery into Tuesday. A mixed outlook likely continues later next week with rain most frequent in western Scotland. Temperatures varying, some cooler days especially in Scotland, but often fairly mild further south, at times quite warm and humid.