Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday's Forecast
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
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 18th May 2026
Last updated
Sun 17th May 26 at
4:27PM
Summary for all mountain areas
Variable hill cloud at dawn, early rain in Wales into Lakeland and south/eastern Scotland; NW Scotland starts clear. Most cloud lifts to or above summits. Heavy afternoon showers build over the Pennines northward across most of Scotland; risk hail and local thunder. Risk lingering rain south Wales.
Headline for Eryri / Snowdonia National Park
Early cloud and patchy rain mostly clears for some sunshine
How windy? (On the summits)
Southwesterly 10mph, but may be stronger up to dawn. Shifting southerly as evening approaches and rising towards 20mph, further deteriorating overnight.
Effect of the wind on you?
Fairly small.
How Wet?
Early showers, many hills dry well into the day
Patchy rain and odd showery bursts possible in morning, likely to fade and clear away eastwards by midday. Some rain lingers south of Penygader. As evening approaches, rain arrives from the southwest, spreading widely overnight.
Cloud on the hills?
Lifting to summits with clear moments for several hours
Varied cloud banks around hills in morning, particularly western areas. Lifting higher, clearing tops and increasingly breaking up by early afternoon, though a few caps may cling to high western slopes and tops. Later as rain develops, cloud then lowering back onto hills from the south.
Chance of cloud free summits?
30% rising to 70%; dropping by dusk.
Sunshine and air clarity?
Variable cloud, glimpses of sun, perhaps more extensive sun for several afternoon hours, then high cloud tends to build through afternoon into evening. Visibility very good.
How Cold? (at 900m)
2C rising to 5C; staying elevated into night and may rise further. If exposed to increasing wind later, feeling nearer -5C, or colder toward dusk.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 19th May 2026
Last updated
Sun 17th May 26 at
4:27PM
How windy? (On the summits)
Southwesterly 35-50mph most of the day, gusty over tops and high passes. May ease slightly for a few morning hours.
Effect of the wind on you?
Walking arduous in exposure most of the day, buffeting gusts over tops and passes and wind chill.
How Wet?
Often raining, sometimes heavy
Persistent rain from before dawn lingers into the morning. Frequent showers follow with heavy bursts; risk of isolated hail and thunder. West slopes stay drizzly even between showers. 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 haze.
How Cold? (at 900m)
6 to 8C. 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
Sun 17th May 26 at
4:27PM
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. Feeling like -2 to -5C in strongest direct wind.
Freezing Level
Above the summits.
Planning Outlook
A mixed but milder outlook. Damp southwesterlies prevail for a few days as mid-week approaches with regular rain and showers, most on western hills where drizzly rain may persist between showers and persistent low cloud. Expect increasingly wet conditions underfoot and slippery rock surfaces. Also, a risk of isolated hail and lightening in the showers; showers may be enhanced in eastern Scotland in sea breezes. Indications of rising pressure later in the week, brining milder and drier conditions to England and Wales. However, some drizzle and low cloud may continue to affect western hills, with periods of rain and wind continuing to affect Scotland. Pressure may continue to rise into the weekend, allowing for warmer and sunnier conditions, but some fronts and lingering humidity will bring local periods of rain.