Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Hazy, some fog banks
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Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Bright sunshine
Beware of sunburn from bright spring sunshine, despite feeling cool in any breeze on higher terrain.
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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Hazy, some fog banks
Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Bright sunshine
Beware of sunburn from bright spring sunshine, despite feeling cool in any breeze on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 19th March 2026
Last updated
Wed 18th Mar 26 at
4:15PM
Summary for all mountain areas
Dry overall, clear hills and sunny, thin high cloud for Scotland. A zone of cloudier skies and some varied fog from the Borders to northeast Pennines. Warmer further southwards, sunny but hazy views, some early valley fog in Wales & Peak District. Light winds for most places, breezier in south Wales.
Headline for Eryri / Snowdonia National Park
Sun and haze. Mostly light wind, local gusts.
How windy? (On the summits)
Easterly 10mph, at times directed more southeasterly. Some light gustiness, to 15mph mainly mid-Wales.
Effect of the wind on you?
Negligible.
How Wet?
No precipitation expected
Cloud on the hills?
Early valley fog dissipates for clear hills
Patches of fog in sheltered valleys in the morning, most common in east and mid-Wales. Fog begins to lift upslope after sunrise, soon dissipating for cloud-free hills.
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Extensive sunshine, thin high cloud to the north afternoon. Good visibility but hazy, particularly east Wales.
How Cold? (at 900m)
10C, much warmer than valleys early in day. Feeling like 5C if exposed to breeze.
Freezing Level
Above the summits. Possibly pockets of frost some valleys at first.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 20th March 2026
Last updated
Wed 18th Mar 26 at
4:15PM
How windy? (On the summits)
Easterly or variable 10 to 15mph or less.
Effect of the wind on you?
Small.
How Wet?
Precipitation not expected
Cloud on the hills?
Mostly little
Patchy fog in valleys from dawn, possible patchy cloud forming around some hill slopes for a time, mostly eastern areas, but tending to lift above tops or largely disperse into middle of day.
Chance of cloud free summits?
80%
Sunshine and air clarity?
Sun and thin cloud. Visibility very good, some haze lower down.
How Cold? (at 900m)
Around 5C, some cooler spots at first, then some slightly warmer spots by afternoon.
Freezing Level
Above the summits, but slight frost in valleys and some sheltered higher areas at dawn.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 21st March 2026
Last updated
Wed 18th Mar 26 at
4:15PM
How windy? (On the summits)
Variable 10mph or less.
Effect of the wind on you?
Negligible.
How Wet?
Precipitation not expected
Cloud on the hills?
Early low-level fog clearing
Fog mostly confined to valleys in the morning, some patches briefly rising upslope, otherwise the mountains clear.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Mostly sunny, thin high cloud. Hazy views.
How Cold? (at 900m)
7C, rising slightly into afternoon.
Freezing Level
Above the summits, but patchy frost in valleys and sheltered higher areas around dawn.
Planning Outlook
High pressure stays nearby toward the weekend, although retreats to allow west-southwesterly winds to move into Scotland, bringing more cloud to the northwest and some drizzle on Saturday, though most places remain dry. By Sunday, stronger westerly winds and a front passing eastwards with a spell of rain followed by lowering temperatures and showers with snow and hail over the hills in Scotland. A chilly start to the new week, near or below freezing over higher mountains, particularly Scotland. Changeable westerlies during next week, windy for all at times, showery conditions most common in western Scotland. High pressure to the south may rebuild to settle things again.