Snowdonia National Park
Includes all summits in the the northern half of Wales from Plynlimon northwards.
Viewing Forecast For
Snowdonia National Park
Monday 27th September 2021
Last updated
Sun 26th Sep 21 at
2:24PM
Summary for all mountain areas
Residual heavy rain and low cloud from overnight will clear east in morning. Chiller conditions follow to all areas with a gusty southwesterly wind and showers; most frequent across Wales and also western Scotland where they will fall as sleet on the highest munros.
Headline for Snowdonia National Park
Frequent showers with cloud often covering tops. Blustery.
How windy? (On the summits)
Southwesterly 25 to 35mph.
Effect of the wind on you?
Increasingly blustery with conditions fairly arduous with considerable wind chill and buffeting.
How Wet?
Frequent showers
Any residual heavy rain in the east soon clearing after dawn. Showers will then become frequent for a few hours with the risk of hail and thunder.
Cloud on the hills?
Frequently covering tops.
Cloud will very likely frequently cover the tops in fog, particularly across the Snowdon Range. Best of the breaks will be across east Wales.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Occasional patches of sun. Visibility good or very good, but slight haze.
How Cold? (at 900m)
5C
Freezing Level
Above the summits.
Viewing Forecast For
Snowdonia National Park
Tuesday 28th September 2021
Last updated
Sun 26th Sep 21 at
2:24PM
How windy? (On the summits)
Low confidence in detail: Southwesterly in the range 20 to 35mph, risk 45mph for a few hours in afternoon higher slopes.
Effect of the wind on you?
Be prepared for arduous conditions across the hills for several hours with considerable wind chill and buffeting.
How Wet?
Frequent pulses of rain, may ease later.
Frequent pulses of rain moving in from the west with some heavy falls and a risk of thunder. Showers may ease in intensity and frequency through the afternoon.
Cloud on the hills?
Becoming fairly extensive higher slopes.
Cloud likely covering the hills fairly frequently through the day above around 600-800m. Best breaks east Wales, and perhaps also further west later.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Mostly cloudy. Visibility often poor due to rain, may become very good later.
How Cold? (at 900m)
5C
Freezing Level
Above the summits
Viewing Forecast For
Snowdonia National Park
Wednesday 29th September 2021
Last updated
Sun 26th Sep 21 at
2:24PM
How windy? (On the summits)
Northwesterly 25 to 35mph will ease to around 15 to 25mph into the afternoon.
Effect of the wind on you?
Fairly arduous through the morning with significant buffeting and wind chill, easing by midday.
How Wet?
Showers, most frequent morning
Showers will run in from the northwest, these frequent and heavy for a few hours in the morning when risk of thunder.
Cloud on the hills?
Fairly extensive on tops.
Cloud capping higher tops fairly extensively for several hours, especially across Snowdon Range where may linger all day.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Frequently cloudy, but some patches of sun breaking through occasionally. Visibility very good, but poor in showers.
How Cold? (at 900m)
4C
Freezing Level
Above the summits
Planning Outlook
An unsettled and windy period of weather over the next 7 to 10 days with frequent areas of low pressure bringing bouts of upland gales or severe gales and rain; large falls accumulating across western hills. Chillier than of late, some days near freezing on higher Scottish tops with sleet and wet snow at times on the highest Munros.