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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate 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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 15th November 2026
Last updated
Sat 14th Nov 26 at
4:00PM
Summary for all mountain areas
Rain and increasingly snow over Scottish mountains as colder air moves in. Drier and higher cloud bases toward southwest Highlands. Rain affects northern England and Wales with some persistent and locally heavier falls, becoming snow on hills into evening. Wind speed and direction will vary in all areas.
Headline for Eryri / Snowdonia National Park
Frequent or persistent rain, sleet tops, low cloud; windy later.
How windy? (On the summits)
South-southwesterly or variable, 20-25mph up to dawn, but soon 15mph or often less onward into early afternoon, but then switching northwesterly and rapid rise to 35-40mph up to dusk or soon after dark.
Effect of the wind on you?
Mostly small until into afternoon, then worsening quickly and sudden buffeting gusts develop, challenging walking soon after sunset and significant wind chill.
How Wet?
Often raining, heavier at times; sleet tops
Rain fairly widely all day, sometimes patchy and light, but steadier heavier falls for periods, particularly western areas, setting in most prolonged likely in afternoon. Some sleet or wet snow may fall on higher tops in heavier moments. A few showers into evening with snow down to 500m.
Cloud on the hills?
Extensive
Shrouding the mountains most likely all day, fairly persistent to mid-elevations in the west, but some variable breaks toward Carneddau and east Wales for periods. Blanket cloud likely afternoon. Lifting bases only after dark.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Overcast and dull or murky. Often poor visibility most hills.
How Cold? (at 900m)
3 to 5C, little change until evening, then dropping after dark to -1C. By late afternoon onward, feeling like -7C in the wind, or -12C after dark.
Freezing Level
Above the summits until dusk, then dropping rapidly into evening to 800m, or nearer 600m onward into night.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 16th November 2026
Last updated
Sat 14th Nov 26 at
4:00PM
How windy? (On the summits)
NW'ly 20mph at dawn, soon 10mph or less for a few hours. Into afternoon, rising SE'ly 20-30mph, rapidly 50-60mph after dark.
Effect of the wind on you?
Small until well into afternoon, but later starting to worsen with marked wind chill. Deteriorating significantly into evening.
How Wet?
Early showers fade; snow/rain by evening
Frequent showers from overnight through dawn, snow and hail falling toward lower elevations briefly. Showers fade to be largely dry middle of day-afternoon. After dark, hill snow and rain moves in from south, all rain into night.
Cloud on the hills?
Mostly clearing
Varying cloud capping higher slopes in the morning, mostly northern areas, but lifting and breaking up to leave most hills clear. After dark, as precipitation develops, cloud increasingly enveloping higher terrain.
Chance of cloud free summits?
60% rising to 90%
Sunshine and air clarity?
Patchy sun and cloud at first in north; then sunshine fairly weak due to high cloud, which likely thickens further later. Visibility excellent.
How Cold? (at 900m)
-2C, later 0C, then +5C into night. As wind increases later, feeling like -10C, or colder after sunset.
Freezing Level
600-700m, then rising a little during afternoon, varying in evening, but eventually lifting above the tops into night.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 17th November 2026
Last updated
Sat 14th Nov 26 at
4:00PM
How windy? (On the summits)
Southwesterly 25 to 35mph, some uncertainty of highest speed, chance of more sustained gales occurring.
Effect of the wind on you?
Blustery over high terrain affecting comfortable walking and balance with considerable wind chill. May worsen.
How Wet?
Frequent or persistent heavy rain
Often raining western mountains, heavy bursts sometimes with hail mixed in, chance of isolated thunder. Pulses of rain spreading well inland frequently, but patchier toward east Wales.
Cloud on the hills?
Frequently covering tops
Cloud base varying, but often shrouding higher and western hills above 700m, at times patches to 400m near to west coast. Better breaks higher up from Carneddau to Bala and Berwyn groups.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Little if any sun. Visibility at times good where dry, but often poor in rain in west.
How Cold? (at 900m)
4C, little change all day. Feeling like -5C or possibly near -10C if exposed to stronger wind.
Freezing Level
Above the summits.
Planning Outlook
Cold with higher terrain frequently or almost permanently frozen most or all next week particularly in Scotland. Meanwhile Wales and northern England will see one or two incursions of much warmer air together with areas of persistent rain and intermittent hill snow. Less precipitation generally northward across Scotland, but marked exceptions: here too, where the frequently northerly wind rises over mountains (with the sea directly to the north), accumulations of snow may well be considerable.