Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
Patchy cloud and winter sun
Mostly dry with a mix of cloud and sun, patchy cloud occasionally covering some mountain slopes.
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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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.
Patchy cloud and winter sun
Mostly dry with a mix of cloud and sun, patchy cloud occasionally covering some mountain slopes.
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
Monday 19th January 2026
Last updated
Sun 18th Jan 26 at
4:17PM
Summary for all mountain areas
Rain near the west coast of Scotland, largely dry inland, but low cloud covering southern Highlands widely, higher and more broken cloud northward. Rain or drizzle and blanket fog over the Pennines, drier for Lakes and Wales, with best cloud breaks northern areas. Southerly winds strongest N/W Scotland, gusty.
Headline for Eryri / Snowdonia National Park
Increasing gusty wind. Patchy cloud, clearer NW, mostly dry.
How windy? (On the summits)
Southerly 20mph, gusty 25mph in places around some higher tops, increasing during afternoon to 30mph, stronger gusts soon after dark in west.
Effect of the wind on you?
Fairly small, but becoming more blustery in exposure, affecting ease of walking. Marked wind chill.
How Wet?
A little drizzle locally
Occasional drizzly rain around low cloud, amounts small. Northern areas more often dry.
Cloud on the hills?
Low cloud south/east, clearer northwest
Low cloud from mid-slopes upward in mid Wales. Higher bases and more broken cloud northwestward, breaks toward some tops Carneddau and northwest Snowdon group.
Chance of cloud free summits?
20% Bala to mid-Wales, 60% N/W areas.
Sunshine and air clarity?
Overcast and dull, poor visibility mid and east Wales, hazy lower down, locally much better toward northwest with some sun and very good visibility.
How Cold? (at 900m)
3C. Feeling like -5 to -8C directly in the wind.
Freezing Level
Above freezing to higher tops, but high terrain stays partly frozen.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 20th January 2026
Last updated
Sun 18th Jan 26 at
4:17PM
How windy? (On the summits)
South-southeasterly, strengthening 40 to 50mph, risk 60mph, powerful gusts high tops and in places downslope to north.
Effect of the wind on you?
Arduous or increasingly difficult walking conditions, gusts could knock you over, not just on the tops; significant wind chill.
How Wet?
A little rain
Occasional light rain and drizzle, small amounts toward the north. Later in day, risk some steadier rain setting in, after dark likely heavier.
Cloud on the hills?
Covering many tops, breaks north
Often covering most higher terrain, varying during the day, best of breaks higher up toward north of Ogwen.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Generally cloudy, some brighter moments and glimpses of sun north where visibility good below cloud, reduced around rain.
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
Sun 18th Jan 26 at
4:17PM
How windy? (On the summits)
Southeasterly 30 to 50mph, speed likely to vary during the day, but risk generally strengthening with time.
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, may be 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.
Planning Outlook
South to southeasterly winds prevail during the week ahead, widely strengthening to become persistently windy, gales over mountains with powerful gusts. Mountains near to freezing point in Scotland, typically just above freezing to high tops in England and Wales for a few days. A slowly circulating weather system will bring areas of rain and high-level snow, becoming more persistent as the week progresses, cloud covering most hills; generally driest and clearest in northwest Scotland. Colder air trying to move in from the east into later January, leaving most mountain terrain frozen in the longer range.