Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today'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.
Dry, Inversion
Banks of cloud or fog on lower or middle slopes, but higher terrain likely clear and sunny above an inversion.
Cold
Below freezing all day from many valleys upward. Severe chill factor if exposed to strong winds. Suitable protective clothing required.
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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.
Dry, Inversion
Banks of cloud or fog on lower or middle slopes, but higher terrain likely clear and sunny above an inversion.
Cold
Below freezing all day from many valleys upward. Severe chill factor if exposed to strong winds. Suitable protective clothing required.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 19th January 2025
Last updated
Sat 18th Jan 25 at
4:30PM
Summary for all mountain areas
Banks of low cloud over the southern Highlands and up the west coast to Skye, some patchy coastal drizzle. Many higher Scottish tops poking out above the cloud sheet. The northern Highlands sunnier. England & Wales sees fairly extensive low cloud, with only highest tops possibly poking just above cloud. Wind fairly light.
Headline for Eryri / Snowdonia National Park
Cloud/fog banks, some high tops just clear. Chilly.
How windy? (On the summits)
Southerly 10-20mph. Turning southwest and rising slightly. Gusty on lower terrain up to 30mph.
Effect of the wind on you?
Minimal effects, through gusts on lower terrain may cause moments of imbalance.
How Wet?
Little drizzle southwest
Isolated spells of light drizzle or snow grains possible on mountains near Llyn Peninsula. Otherwise dry.
Cloud on the hills?
Low cloud banks; high terrain clear
Fog and frequent low cloud banks on south and west facing slopes; cloud tops here staying near 800m. Intermittent cloud banks near the Ogwen Valley, potentially often clear near Carnedd Llewelyn.
Chance of cloud free summits?
30%, 80% above 800m
Sunshine and air clarity?
Widely sunny above 800m, patchy sun all day around Ogwen Valley and northeast. Excellent visibility of out cloud, but often poor on some slopes.
How Cold? (at 900m)
0C near west coast, to -2C inland, warming a few degrees in the later afternoon (little variation with height).
Freezing Level
Poorly defined freezing level - partly frozen terrain and near freezing air both higher and lower slopes much of the day.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 20th January 2025
Last updated
Sat 18th Jan 25 at
4:30PM
How windy? (On the summits)
Westerly 10-20mph. Windier in the morning.
Effect of the wind on you?
Fairly small
How Wet?
Showery rain west
Occasional showery rain, primarily in the west. Possibility of frequent rain, but total amounts likely small.
Cloud on the hills?
Hills frequently shrouded.
Low clouds will shroud most hills and mountain tops. Fog patches possible in protected valleys. Occasional breaks possible on lower terrain in the lee of winds.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Little chance of sun. Mostly poor visibility.
How Cold? (at 900m)
2C
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 21st January 2025
Last updated
Sat 18th Jan 25 at
4:30PM
How windy? (On the summits)
South-southwesterly 15-25mph.
Effect of the wind on you?
Convenience of walking affected in higher winds.
How Wet?
Rainy spells, more frequent southwest
Details uncertain. Rain spells, some possibly heavy on higher ground. Rain on southwestern slopes may be rather persistent.
Cloud on the hills?
Tops often capped, lower bases in rain.
Variable, often capping tops. Occasional spells of cloud reaching lower terrain during rain.
Chance of cloud free summits?
50%
Sunshine and air clarity?
Little or no sunshine. Good visibility when out of cloud/rain.
How Cold? (at 900m)
3C at first, dropping to 1C.
Freezing Level
Mostly above the summits. Some brief moments of dropping to highest summits.
Planning Outlook
Gradually lowering pressure and falling temperature during the days ahead - mountain tops dropping sub-zero widely into midweek. Some areas of precipitation, most frequent in western Scotland early in the new week, falling as snow over higher terrain, although total amounts generally small. Blustery over some higher slopes with marked wind chill, but speeds relatively light for many into midweek. Winds are likely to strengthen toward next weekend as deeper areas of low pressure over the Atlantic approach. Late January is likely to see more frequent precipitation and periods of gales or possibly stormy winds at times; fluctuating temperatures and freeze-thaw cycles.