Snowdonia National Park Forecast
Also includes higher summits south to Plynlimon.
Viewing Weather Forecast for Saturday 21st April 2018
Forecast last updated on Friday 20th April 2018 at 2:57pm
Click here to access the PDF version of the forecast.
Click here to view low graphics format of the forecast.How windy? (On the summits)
South to southeasterly 10mph or less from dawn, increasing to 15 or 20mph during the afternoon.
Effect of wind on you?
Small. Locally gusty later where thunderstorms develop.
How Wet?
Thunderstorms developing afternoon
Dry for many hours. Increasing threat of bursts of heavy rain, with local hail, thunder and lightning developing late afternoon and into evening, tracking north/north-eastwards.
Cloud on the hills?
Very little, but forming in rain later
Hills likely cloud-free of much of the day. However, patches forming at varying heights during and after rain later, locally from forest canopies upward.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Sunshine becoming hazier through the day as high level cloud builds from south. Marked haze from dawn; but visibility improving through the day.
How Cold? (at 900m)
10 to 13C, fairly warm from dawn, rising a little through day.
Freezing Level
Above the summits
Planning Outlook
All mountain areas of Britain from Sunday 22nd April 2018
A change to a fresher westerly regime will have taken place by Sunday, which will continue throughout the week ahead - wind speeds varied, intermittently gale force. Cooler temperatures and precipitation almost daily; mainly in the form of showers and falling as snow at times across the Munros. Lowest cloud in the west, often shrouding the mountains, but breaks to higher tops in eastern areas. Often just below freezing on higher Scottish summits, and near zero on high tops in England & Wales. Check out our latest longer range thoughts via the planning outlook video updated Friday on the homepage of mwis.org.uk
