Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday's Forecast
Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
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Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 19th May 2026
Last updated
Mon 18th May 26 at
3:55PM
Summary for all mountain areas
Frequent rain nearly everywhere all day, the rain most persistent west where hill-cloud fills in to low slopes with little improvement. A risk of localised hail and thunder in afternoon showery rain, increasingly wet underfoot, and with slippery rock surfaces. Very windy, gusty gales early including downslope.
Headline for Eryri / Snowdonia National Park
Periods of rain, persistent west; windy, sometimes gale-force
How windy? (On the summits)
Southwesterly 35-50mph most of the day, gusty over tops and high passes, particularly early when gusts reach further downslope. May ease slightly for a few morning hours. Also deteriorating somewhat for a time overnight.
Effect of the wind on you?
Walking arduous in exposure most of the day, buffeting gusts over tops and passes and wind chill; particularly early when strongest gusts will greatly challenge balance.
How Wet?
Periods of rain, sometimes heavy
Clusters of showery rain drive in from the southwest through the day, often with heavy bursts and a risk of isolated hail and thunder. West slopes and high tops stay drizzly even between showers. A few morning hours may be drier. Wet underfoot and slippery rock surfaces.
Cloud on the hills?
Likely extensive
Extensive to low slopes at dawn. Through morning, tending to lift and break in east Wales, locally to 600-700m, any higher breaks fairly brief. Cloud remains extensive western slopes below 600m and often below 400m.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Glimpses of sun in the morning, then later in the day too, otherwise largely cloudy. Visibility often poor due to rain and a building haze.
How Cold? (at 900m)
6 or 7C. East Wales hills rise a degree. Feeling like -5 to -8C in direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 20th May 2026
Last updated
Mon 18th May 26 at
3:55PM
How windy? (On the summits)
West-southwesterly 25-40mph, risk quite gusty over high terrain.
Effect of the wind on you?
Walking impeded in exposure and often strenuous and feeling chilly; considerable buffeting possible over high terrain.
How Wet?
Some drizzly rain
Raining from before dawn, but through morning the rain likely eases, becoming light and patchy and perhaps largely dry by day's end. High summits and west slopes may remain in a drizzly cloud into the afternoon.
Cloud on the hills?
Fairly extensive particularly west
A sheet of cloud shrouds the hills at dawn, to lower western slopes. Bases slowly lift towards 700-800m east of high terrain by later afternoon; bases stay low on western slopes, may not clear much above 500m until late.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Glimpses of sun. Visibility starts poor, improving east as cloud and rain ease.
How Cold? (at 900m)
6 to 8C, mildest north and eastern slopes where may reach 9C. Feeling like -2 to -5C in strongest direct wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 21st May 2026
Last updated
Mon 18th May 26 at
3:55PM
How windy? (On the summits)
South-southwesterly 25-35mph. Gusty over the high tops, and powerful downslope gusts in the morning too.
Effect of the wind on you?
Walking impeded with considerable buffeting often challenging stability in exposure. Feeling cool.
How Wet?
Drizzle lifts to high terrain
Drizzle from middle slopes up from dawn, or lower slopes towards Cardigan Bay. Possibly some heavier rain just at and before dawn. Drizzle rises to high terrain where it will linger well into the day on western slopes.
Cloud on the hills?
Extensive
Cloud shrouds high terrain likely all day, bases down to 300-500m on slopes nearest Cardigan Bay/Llyn Peninsula. North and eastern slopes start shrouded too, but bases lift, as high as 700-800m Carneddau. May break up more late in the day.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Largely overcast and dull with poor visibility. Some chance of sunny glimpses later in the day, best north and east.
How Cold? (at 900m)
10 to 12C. Feeling near freezing in strongest wind.
Freezing Level
Above the summits.
Planning Outlook
Damp southwesterlies establish by mid-week; regular periods of rain with only glimpses of sunshine. Wettest on western hills where drizzle may persist between rain and low cloud clings to the hills. Expect slippery exposed rock surfaces and rare (if any) exposed tops in Scotland before the weekend. Indications of rising pressure later in the week, bringing milder and drier conditions to England and Wales. However, some drizzle and low cloud may continue to affect western hills, outbreaks of rain as well, but rising chances of clear hills. Pressure may continue to rise into the weekend, allowing for warmer and sunnier conditions, but some fronts and lingering humidity will continue to bring cloud and rain here and there.