Snowdonia National Park Forecast

Viewing Weather Forecast for Monday 25th September 2017

Also includes higher summits south to Plynlimon.

Today | Tuesday | Wednesday

Forecast last updated on Monday 25th September 2017 at 7:40am

Summary for all mountain areas

An almost stationary front will lie down the spine of the country. Many areas will have rain and extensive low cloud, with bursts of heavy rain in places. To the west of the front, westernmost summits, particularly Wales will be substantially dry.

Headline for Snowdonia National Park

Rain and low cloud, especially eastern hills

How windy? (On the summits)

Variable in direction 10mph or less, but may reach 15mph for a few hours after dawn.

Effect of wind on you?


How Wet?

Rain, mainly east Wales.

Rain on and off east Wales. Elsewhere substantially dry, although bursts of rain may edge slowly westwards through the afternoon.

Cloud on the hills?

Very extensive east Wales; may break to or above higher tops west

Cloud will shroud many eastern hills in fog above 400m for much of the day, and in some areas, particularly morning from lower slopes up. Western hills will be more varied with patches lowest slopes after dawn, but most cloud will be above 750m, perhaps highest summits afternoon.

Chance of cloud free summits?

Less than 10% east to in afternoon 30% west

Sunshine and air clarity?

Little if any sunshine much of region, but sunshine westernmost mountains. Visibility will become excellent westernmost mountains, otherwise widely foggy.

How Cold? (at 900m)


Freezing Level

Above tops

Planning Outlook

All mountain areas of Britain from Tuesday 26th September 2017

During the first half of the week, an almost stationary front centred down the the spine of the country will give bursts of rain, before petering out by late Tuesday. This will bring a lot of low cloud to the mountains and there will be a marked haze. Best of the conditions will be across the northwest Highlands and at times western Wales. From the middle of next week, more typical southwest winds will bring bands of rain, low cloud, and at times strong winds, countrywide; interspersed by some largely dry and fine days.