Mountain Weather
Information Service
Eryri / Snowdonia National Park Forecast

Eryri / Snowdonia National Park

Includes all summits in the the northern half of Wales from Pumlumon northwards.

Today's Forecast

Windy, walking impeded
Drizzle
Cool

Click an icon for more information or click here for a key to all icons.

Click here to download the latest PDF Last Updated Mon 18th Mar 24 at 4:30PM Last Updated Mon 18th Mar 24 at 4:30PM
View our low-graphics version Last Updated Mon 18th Mar 24 at 4:30PM Last Updated Mon 18th Mar 24 at 4:30PM

Viewing Forecast For

Eryri / Snowdonia National Park
Tuesday 19th March 2024
Last updated Mon 18th Mar 24 at 4:30PM

Summary for all mountain areas

Upland gales for the Highlands in the morning will ease. Early heavy bursts of rain clearing eastwards to leave often drier conditions. Variable cloud amounts, most persistent over western mountains, but lifting with some breaks forming.

Headline for Eryri / Snowdonia National Park

Strong winds easing. Isolated showers.

How windy? (On the summits)

Southwesterly 25 to 30mph at first, but soon easing towards midday and dropping out in the afternoon.

Effect of the wind on you?

Blustery morning with some buffeting at times, but easing by afternoon.

How Wet?

Occasional showers, mainly morning.

A few drizzly showers through the day, these mostly in morning when they may be frequent for a time. Heavier rain moving in from the southwest into the night.

Cloud on the hills?

Cloud lifting, but often still capping tops.

Extensive hill fog likely from mid to upper slopes early in the morning. However bases will gradually rise, and by afternoon become confined to the tops.

Chance of cloud free summits?

20% lifting to 60%

Sunshine and air clarity?

Cloudy morning, patchy sun in the afternoon. Visibility poor at times in morning drizzly showers, but otherwise very good.

How Cold? (at 900m)

4C. Wind chill feeling like -5C in stronger winds.

Freezing Level

Above the tops

Viewing Forecast For

Eryri / Snowdonia National Park
Wednesday 20th March 2024
Last updated Mon 18th Mar 24 at 4:30PM

How windy? (On the summits)

Mostly northerly or at times variable 10 to 15mph.

Effect of the wind on you?

Mostly small, but marked chill in the breeze.

How Wet?

Wet day with steady rain much of day.

A damp day with light to moderate rain, perhaps heavy at first, which will continue on and off through the day, easing later in the afternoon.

Cloud on the hills?

Extensive, possible breaks later.

Extensive hill fog through much of the day, patches down to lowest slopes in the rain. Bases may break up and lift from the west later in the day.

Chance of cloud free summits?

20%

Sunshine and air clarity?

Overcast. Visibility often poor due to rain.

How Cold? (at 900m)

Around 2C

Freezing Level

Above the summits

Viewing Forecast For

Eryri / Snowdonia National Park
Thursday 21st March 2024
Last updated Mon 18th Mar 24 at 4:30PM

How windy? (On the summits)

West to southwesterly 30 to 45mph.

Effect of the wind on you?

Very blustery, in places arduous conditions affecting balance on exposed high tops and ridges. Significant wind chill.

How Wet?

Patchy rain, risk heavier later

Mostly small amounts of rain or drizzle in the wind, but later in the day, this becoming steadier rain, some heavy bursts by evening into night.

Cloud on the hills?

Becoming extensive

Lowering to cover most mountains, particularly near to west coast.

Chance of cloud free summits?

40%

Sunshine and air clarity?

Mostly cloudy. Visibility good, but becoming hazier.

How Cold? (at 900m)

5C. Wind chill feeling like -5 to -8C on tops.

Freezing Level

Above the summits. Then into night, starting to drop toward freezing on highest tops.

Planning Outlook

Mixed westerly patterns prevail this week, but turning northwesterly toward the weekend allowing much colder air to move in - dropping extensively below freezing point over all British mountains for several days. Fresh upland snowfalls, concentrated toward the west and north of the Highlands, including heavy showers with hail. A period of sustained gales over the tops late this week and likely into the weekend - severe gales over Scottish tops on Thursday at least; significant or at times severe wind chill factor.