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.
Winter sunshine
Bright sunshine most of the day with the mountains generally free of cloud. Snow cover on higher terrain.
Clear over snow cover
Excellent or superb visibility, but be aware that paths over the mountains may be obscured by lying snow.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Terrain widely frozen
All ground frozen from lower elevations upward, with hard frost or snow cover. Beware of icy surfaces on lower and higher terrain. Appropriate footwear needed, crampons may be necessary.
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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.
Winter sunshine
Bright sunshine most of the day with the mountains generally free of cloud. Snow cover on higher terrain.
Clear over snow cover
Excellent or superb visibility, but be aware that paths over the mountains may be obscured by lying snow.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Terrain widely frozen
All ground frozen from lower elevations upward, with hard frost or snow cover. Beware of icy surfaces on lower and higher terrain. Appropriate footwear needed, crampons may be necessary.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 21st November 2025
Last updated
Thu 20th Nov 25 at
4:00PM
Summary for all mountain areas
Terrain widely frozen after hard frost; snow cover across much upland terrain, or more substantial to lower slopes northern Highlands. A front moves into Scotland, snow then rain in west, cloud lowering. Elsewhere dry, sunshine weakening. Wind strengthening to gale force Scottish mountains.
Headline for Eryri / Snowdonia National Park
Mostly light wind during day. Dry with sunshine, high cloud.
How windy? (On the summits)
North-northwest turning west later southwesterly, 15 to 20mph at first, soon dropping to 10mph or less for a few hours, increasing afternoon to 20mph up to dusk, into night eventually to 40-50mph.
Effect of the wind on you?
Mostly small during daytime, then feeling more blustery up to dusk, deteriorating into the night.
How Wet?
Generally dry until midnight
A covering of snow over snow mountains, mostly north & east hills. Chance an odd early flurry near coast, but most or all daytime dry. Into night, rain developing from west, snow on higher terrain for a time.
Cloud on the hills?
Little if any
Hills largely clear all day. Into afternoon, some patches may form on slopes near west coast.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Sun through high cloud, tending to thicken from west, may become obscured later. Visibility excellent, possible mist or haze in some valleys.
How Cold? (at 900m)
-2C, slight rise toward 0C afternoon, then just above into night. If wind increases, feeling near -10C later.
Freezing Level
Terrain widely frozen inland in morning, all day out of sunlight. Near coast up to 700m, then into night widely just above freezing to upper slopes.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 22nd November 2025
Last updated
Thu 20th Nov 25 at
4:00PM
How windy? (On the summits)
SW'ly 40mph at first, risk 50mph prior to dawn, easing to W later SW'ly again, 20-25mph. Into night S'ly 40-50mph.
Effect of the wind on you?
Challenging conditions around and before dawn, improving, but still noticeably breezy with marked wind chill on high tops.
How Wet?
Early rain fades, light showers
Rain from overnight through to dawn, clearing into morning. Tending to ease off and become patchy, drier afternoon. Rain returning persistently into night.
Cloud on the hills?
Extensive, some rising into afternoon
Shrouding the hills widely, banks to some lower elevations in morning. Base tending to rise to 600-800m, lowest near coast, higher breaks Carneddau to Berwyn and Bala groups afternoon.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Largely cloudy, brief glimpses of sun north of the A5. Misty and dull, some improvement if rain fades.
How Cold? (at 900m)
2 or 3C. Feeling like -5C in the wind, nearer -10C perhaps just at first.
Freezing Level
Above the summits, but some highest terrain may stay at least partly frozen.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 23rd November 2025
Last updated
Thu 20th Nov 25 at
4:00PM
How windy? (On the summits)
Low confidence of detail: Likely west or northwesterly, speed may vary, but risk up to 50mph, chance 60mph.
Effect of the wind on you?
Beware possibility of generally poor conditions, difficult walking and significant wind chill.
How Wet?
Frequent rain, heavy bursts
Rain frequent or merging to more persistent falls over western hills, heavy bursts on and off. May fall as snow occasionally on highest tops, risk hail.
Cloud on the hills?
Extensive
Cloud base may vary, but often covering hills above 600-800m, lowest near to west coast, some breaks well inland/eastward.
Chance of cloud free summits?
20%
Sunshine and air clarity?
No sun expected. Visibility often poor in precipitation, local improvements eastern hills.
How Cold? (at 900m)
0 to 2C. Feeling like -10 to -15C if exposed to stronger speeds.
Freezing Level
Above the summits; may drop to 900-1000m in heavier precipitation, then more generally 900m into night.
Planning Outlook
Changes into the weekend as less cold Atlantic air moves in, but higher mountain terrain at least in Scotland staying frozen with snow cover. A complex area of low pressure circulates over Britain through the weekend, retreating to leave briefly northeasterly winds by Monday; areas of rain and some upland snow, mainly Scotland and high tops in northern England. Winds will vary markedly, some lulls, but risk periods of gales. A brief ridge of high pressure gives a lull by Tuesday, then a shift to milder southwesterlies is likely to bring spells of rain and some thawing to higher levels.