Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday'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+
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Hazy, some fog banks
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Visibility reduced around cloud banks, hazier on some lower slopes. Locally some improvements possible out of cloud.
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+
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Hazy, some fog banks
Visibility reduced around cloud banks, hazier on some lower slopes. Locally some improvements possible out of cloud.
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
Tuesday 20th January 2026
Last updated
Mon 19th Jan 26 at
4:30PM
Summary for all mountain areas
Strong southeasterlies, gusting gale-force Scottish mountains, strengthening widely. Gales all day for Wales, severe on high tops, increasingly northern England also. Some light rain and hill snow flurries, mostly eastern Scotland, fading with rising cloud base. Heavier rain develops in south Wales.
Headline for Eryri / Snowdonia National Park
Gales, severe over tops. Clear hills for a time, patchy rain later.
How windy? (On the summits)
South-southeasterly, strengthening rapidly up to dawn 50 to 60mph, reaching 70mph on high tops, powerful gusts in places downslope to north.
Effect of the wind on you?
Difficult walking conditions throughout the day, any mobility challenging on high terrain gusts could knock you over, not just on the tops; significant wind chill.
How Wet?
Largely dry morning, patchy rain develops
Rare spots develop from high cloud, more frequent into the afternoon in west. Later in day, some steadier rain setting in from the southwest, after dark likely heavier.
Cloud on the hills?
Good breaks north/west
Cloud banks mostly eastern mid-Wales from dawn, tending to lift in morning. Clearer much of Eryri NP, hills toward northwest often clearer for several hours. With time, cloud banks may form more widely from south on tops.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Glimpses of sun north where visibility good, thickening high cloud from the southwest to become overcast, later visibility reducing as rain develops.
How Cold? (at 900m)
1 or 2C. Wind chill feeling like -12 to -15C.
Freezing Level
Just above freezing on highest summits, icy surfaces on high tops.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 21st January 2026
Last updated
Mon 19th Jan 26 at
4:30PM
How windy? (On the summits)
Southeasterly 35 to 50mph, speed likely to vary, but generally strengthening into middle of day, risk 60mph high tops.
Effect of the wind on you?
Walking increasingly arduous over exposed terrain, gusts frequently knocking you off balance. Significant wind chill.
How Wet?
Patchy rain, snow tops; risk frequent
Rain on and off, becoming fairly persistent for periods, sleet or snow falling on higher tops; smaller amounts northern areas.
Cloud on the hills?
Fairly extensive
Covering most higher hills, from 500 to 700m upward, higher cloud bases toward the north, some breaks Carneddau.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Overcast and dull, poor visibility in rain, locally better at times north.
How Cold? (at 900m)
Around 0C. Wind chill feeling like -10 to -15C where exposed on higher areas.
Freezing Level
Near or just below freezing above 800m, tending to lower slightly during day.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 22nd January 2026
Last updated
Mon 19th Jan 26 at
4:30PM
How windy? (On the summits)
Easterly 35 to 50mph, stronger gusts in places around high tops and downslope to west; strongest northern areas.
Effect of the wind on you?
Challenging conditions, difficult in exposure and gusts knocking you off balance not just on tops. Significant wind chill.
How Wet?
Patchy rain
A little rain on and off, amounts mostly small, but risk odd heavier bursts drifting up from the south, may turn to sleet or snow on highest summits, risk hail.
Cloud on the hills?
Fairly extensive on tops
Often capping higher slopes, most persistent mid-Wales, but bases varying. Highest bases northwest Snowdon group, clearing above tops occasionally.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Largely cloudy, some brighter moments western areas, sun may break through. Visibility good, but some haze likely.
How Cold? (at 900m)
1 or 2C. Wind chill feels as cold as -15C.
Freezing Level
Just above freezing on highest tops.
Planning Outlook
Strong east to southeasterlies continue beyond midweek, sustained gales over most mountains with powerful gusts downslope toward west. Near or just below freezing on higher tops - colder air is likely to move into Scotland at least late in the week, much mountain terrain then frozen with severe chill factor. Scope for substantial snowfalls over eastern Scottish hills later this week. Sleet or snow mostly higher tops in England and Wales, may fall lower over the weekend. Low cloud often covering many hills across Britain, clearer and drier toward western coasts. Circulating low pressure and cold air likely into next week, with further snowfalls likely.