Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday's Forecast
Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Hazy, some fog banks
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Hazy views with lack of air clarity, particularly on lower terrain, some fog banks on hills making navigation locally more difficult. If above an inversion, the air outstandingly clear.
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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Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Hazy, some fog banks
Hazy views with lack of air clarity, particularly on lower terrain, some fog banks on hills making navigation locally more difficult. If above an inversion, the air outstandingly clear.
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 23rd November 2025
Last updated
Sat 22nd Nov 25 at
5:41PM
Summary for all mountain areas
Low pressure will dominate the weather bringing areas of strong winds, rain (or snow on higher areas) and extensive fog to the hills - whiteout in places mainly southern Highlands. Windiest in Wales where upland gales will strengthen, whilst least windy S Scotland.
Headline for Eryri / Snowdonia National Park
Rain (mainly Snowdon range) and fog; strengthening upland gales.
How windy? (On the summits)
Westerly, widely 40mph morning, but strengthening toward 50mph by early or mid afternoon, perhaps by dusk 60mph higher tops.
Effect of the wind on you?
Significant wind chill and difficult walking, particularly afternoon when general mobility increasingly challenging.
How Wet?
Showers, some heavy
Rain overnight soon clearing. Then showers, some heavy with hail and low risk thunder. Risk hail, and snow above 800m; small risk thunder.
Cloud on the hills?
Extensive on higher slopes most or all all day
Cloud base varied, but widely covering hills above 600-800m, lowest near to west coast, where occasionally forming below 450m.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Rare glimpses of sun if any. Visibility often poor in precipitation, otherwise good visibility although a haze.
How Cold? (at 900m)
1C. Will feel like -13C directly in the wind later in the day.
Freezing Level
950m or above.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 24th November 2025
Last updated
Sat 22nd Nov 25 at
5:41PM
How windy? (On the summits)
Northerly, 25 to 30mph.
Effect of the wind on you?
Will impede ease of walking across the hills, and at times in gusty conditions, balance may be tricky and wind chill considerable.
How Wet?
Little or perhaps no precipitation
Intermittent rain overnight will continue into daylight, but will amount to little and through morning ease to just a few showers.
Cloud on the hills?
Cloud base rising - probably not clearing higher summits
Morning: cloud shrouding higher areas extensively. Gradually cloud base rising toward 750 to perhaps 900m mid Wales, but patches may persist below 600m near and north of the A5.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Patches of bright sunshine slowly coming through - little sun near and north of A5. Visibility very good or perhaps in afternoon excellent.
How Cold? (at 900m)
Around 1C - a marginal drop likely through the day Will feel as cold as minus 8C directly in the wind.
Freezing Level
1050m.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 25th November 2025
Last updated
Sat 22nd Nov 25 at
5:41PM
How windy? (On the summits)
Northerly 25mph gradually easing to 15mph.
Effect of the wind on you?
Becoming small
How Wet?
Little or no precipitation
Showers, mainly Snowdon range, of hail or snow above about 600m.
Cloud on the hills?
Varied; some higher tops clearing, others remaining in cloud.
Snowdon range: cloud base typically 600 to 800m, perhaps a little higher afternoon. Elsewhere: cloud will lift off some higher summits, whilst 'hanging' on some higher slopes all day.
Chance of cloud free summits?
20% Snowdon range; 70% elsewhere
Sunshine and air clarity?
Bright sunshine, mainly away from Snowdon range. Very good visibility.
How Cold? (at 900m)
0C
Freezing Level
Around 900m; may rise slowly through day. Frost some valleys morning.
Planning Outlook
After a brief burst of cold air on Monday and Tuesday winds will turn westerly. It will be milder with a week or more frequent rain and upland gales, particularly on western mountains. In Scotland, temperatures on the Munros will sometimes be below freezing point, but fresh snow transient, whereas elsewhere, snow rare, if any.