Snowdonia National Park Forecast
Also includes higher summits south to Plynlimon.
Viewing Weather Forecast for Monday 24th April 2017
Forecast last updated on Monday 24th April 2017 at 7:07am
Summary for all mountain areas
A cold front passing southwards brings a marked change to Arctic air. Heavy showers of snow and hail spread from the north, merging into constant precipitation for several hours in Scotland. Winds up to gale force. Whiteout and severe wind chill Scottish mountains.
Headline for Snowdonia National Park
Increasingly cold. Early rain, later snow & hail showers.
How windy? (On the summits)
Northwesterly, 20 to 25mph, then by late afternoon into the evening, strengthening to 35 or 40mph.
Effect of wind on you?
Fairly small for many hours. Deteriorating later to give arduous walking and significant wind chill.
Occasional rain; later hail showers north
Showery rain occasionally. Toward evening, scattered hail and snow showers, most likely Snowdon range.
Cloud on the hills?
Cloud widely on higher areas morning, and may form below 400m slopes toward west coast. Will all clear from north around middle of day or into the afternoon mid-Wales.
Chance of cloud free summits?
30% morning; 70% afternoon.
Sunshine and air clarity?
Patches of bright sunshine and often excellent visibility spreading southwards afternoon.
How Cold? (at 900m)
2 dropping to -1C, then -3C by evening. Late in day, where directly exposed to strongest wind, feeling like -15 Celsius.
Above the summits most or all morning. Then dropping to around 750m, or 500m by dusk.
All mountain areas of Britain from Tuesday 25th April 2017
An Arctic air mass encompasses the British Isles bringing winter-like conditions during midweek. Freezing levels will be very low. Widespread snow and hail showers, sometimes frequent, or near constant northern Scotland. Significant wind chill. Less cold from about Thursday onward as winds back westerly. Frontal systems moving in from the Atlantic are likely to bring periods of rain and upland gales heading into the May Day weekend, although a gradual improvement may develop.