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Snowdonia

Weather hazards over 300m on Sat 05 Sep 2015

High risk

No high risks
none

Medium risk

No medium risks
none

Low risk

Strong sunlight
Low risk of sunburn in any prolonged spells of sunshine.

No risk

Blizzards
none
Heavy snow
none
Storm force winds
none
Gales
none
Severe chill effect
none
Persistent extensive hill fog
none
Thunderstorms
none
Heavy persistent rain
none

Sat 05 Sep 2015

Outbreaks of patchy light rain through the early hours should soon clear. Saturday should be a fine day across the park. Increasing breaks in the cloud by late morning will allow some pleasant late summer sunshine, though it will be cool for the time of year. Winds should ease further too and with excellent visibility some fine walking conditions should be on offer.

Time
0000 to 0300 0300 to 0600 0600 to 0900 0900 to 1200 1200 to 1500 1500 to 1800 1800 to 2100 2100 to 2400
Weather
Cloudy Cloudy Sunny intervals Sunny intervals Sunny intervals Sunny day Clear night Clear night
Precipitation probability
80% 20% 0% 0% 0% 0% 0% 0%

Visibility

Locally moderate in rain and very poor in hill fog at first, but generally very good or excellent.

Hill Fog

Broken bases 600 m through the early hours, this readily lifting and breaking before dawn with no further hill fog expected.

Max wind above 500m

Northerly 25 mph at first.

Temperature

Valleys:
Plus 5 Celsius becoming 15 Celsius.
800m:
Plus 5 Celsius.
Freezing level:
Well above the summits.

Sun 06 Sep 2015

Clear spells overnight will allow it to turn chilly in some valleys, with some mist or fog possible. It will be another fine and dry day across the park though. There will be some cloud around, but also some breaks allowing some sunshine and with light winds it will feel warm.

Visibility

Generally very good to excellent once any valley mist has cleared.

Hill Fog

Not expected.

Max wind above 500m

Northerly 10 to 15 mph.

Temperature

Valleys:
Plus 4 Celsius becoming 15 Celsius.
800m:
Plus 4 to 6 Celsius.
Freezing level:
Above the summits.

Mon 07 Sep 2015

A chilly start with some patchy valley mist or fog possible. Perhaps even a touch of ground frost first thing. It will be another fine day across the park though, with little in the way of hill fog and it will again feel pleasant in the sunshine.

Tue 08 Sep 2015

Remaining fine and settled. Chilly overnight but with daytime temperatures returning to normal, and again feeling warm in light winds.

Wed 09 Sep 2015

The dry weather should continue into Wednesday with further warm sunshine by day, after a chilly start.

Issued at: 1446 on Fri 04 Sep 2015