Snowdonia National Park
Includes all summits in the the northern half of Wales from Plynlimon northwards.
Viewing Forecast For
Snowdonia National Park
Monday 12th April 2021
Last updated
Sunday 11th April 2021 at
3:10 PM
Summary for all mountain areas
Staying cold, sub-zero on the mountains, but winds generally light. Dry with sunshine and very clear air for many places. Chance of isolated snow showers or flurries. Cloudier for Wales. Widespread significant frost inland after dawn.
Headline for Snowdonia National Park
Cold, breezy at times on tops. Mainly dry; cloud breaks to summits.
How windy? (On the summits)
Northwesterly 15 to 25mph, typically strongest early morning, then may increase a little again toward evening.
Effect of the wind on you?
Fairly small through middle of day, but may be blustery with marked wind chill on higher terrain early and late.
How Wet?
Substantially dry
Any overnight precipitation likely clearing by dawn, snow to low levels in places. Then mostly dry, rare brief snow or soft hail flurries, these typically tracking southeastward from Snowdon range in afternoon.
Cloud on the hills?
Risk banks of cloud for a few hours.
Patches of cloud for few hours in the morning across higher slopes, particularly westernmost hills, before bases tend to lift and many tops clearing, particularly afternoon.
Chance of cloud free summits?
50% rising to 80%
Sunshine and air clarity?
Fairly cloudy from dawn, but some patchy sun likely to break through. Visibility mostly very good or excellent.
How Cold? (at 900m)
-3C lifting to around -1C. Where exposed to wind on tops, feeling closer to -10C.
Freezing Level
Generally 600m, but down to lower slopes at dawn in east after frost, lifting to around 800m.
Viewing Forecast For
Snowdonia National Park
Tuesday 13th April 2021
Last updated
Sunday 11th April 2021 at
3:10 PM
How windy? (On the summits)
West to northwest around 10mph.
Effect of the wind on you?
Small
How Wet?
Risk showers; snow higher slopes.
Often dry through the day, but risk of a scattering of showers developing; snow across higher slopes.
Cloud on the hills?
Forming in and around showers
Very likely hills often clear through the day, but should snow showers develop; fog will shroud higher slopes here and there.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Periods of sunshine, but may become cloudy into the afternoon. Visibility excellent, but poor/very poor in any showers.
How Cold? (at 900m)
Around -1C lifting to 1C
Freezing Level
Around 800m, but widespread frost lower slopes at dawn. Freezing level lifting to 1000m.
Viewing Forecast For
Snowdonia National Park
Wednesday 14th April 2021
Last updated
Sunday 11th April 2021 at
3:10 PM
How windy? (On the summits)
Easterly, may increase 5 to 15mph.
Effect of the wind on you?
Likely small, but marked chill may develop.
How Wet?
Possible snow flurries
Chance of an isolated snow or soft hail flurry. Where these do form, they will move around slowly for an hour or so.
Cloud on the hills?
Little if any
Fragments of cloud may briefly form on higher slopes in morning, otherwise most cloud which forms will be above the hills. Brief patches on tops if showers occur.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Periods of sunshine; cloud sometimes filling in, particularly inland by afternoon. Visibility excellent.
How Cold? (at 900m)
0C rising to 2C.
Freezing Level
Frost in some valleys and corries from dawn; then typically just above freezing to highest summits.
Planning Outlook
High pressure influences Britain through the next week to 10 days, maintaining quiet and fairly cool conditions, although a gradual rise of temperature is expected. Frost remains common, with a general rise of freezing level on the mountains into the afternoons. Existing lying snow on higher mountains will stay in place, thawing slightly during daytimes. Sun and variable cloud; most mountains often clear. Very little precipitation, apart from very isolated showers of snow or soft hail. Mostly light winds, but there may be some strengthening of wind around next weekend.