Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
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Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Chilly
Air temperature typically 0 to 5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 12th March 2026
Last updated
Wed 11th Mar 26 at
12:53PM
Summary for all mountain areas
Severe gale or storm force upland winds ahead of an active slowly southeastward moving front, which will bring widespread heavy rain and fog to almost all mountain areas. Across Scotland, behind the front, squally hail and snow showers.
Headline for Eryri / Snowdonia National Park
Upland storm force wind; frequent rain, and fog.
How windy? (On the summits)
Southwesterly 60 to temporarily 70 or on highest tops 80mph. Will ease to 45mph from northwest only late in day.
Effect of the wind on you?
Very difficult conditions. On higher areas, where exposed any mobility challenging. Severe wind chill.
How Wet?
Persistent, increasingly heavy rain - least wet easternmost summits
Rain more or less constant all day; turning heavy for periods, mainly Snowdon range.
Cloud on the hills?
Fairly extensive, lowest west
Shrouding even many lower slopes all day. Generally highest cloud base toward and north of Ogwen valley and easternmost slopes in east Wales, but even here not often above 700m.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Dull and misty or murky after the odd glimpse of sun east Wales morning.
How Cold? (at 900m)
5C. Will feel as cold as minus -12C directly in wind. May drop abruptly Snowdon range to 0C later afternoon.
Freezing Level
Above the summits possibly most of daylight, lowering to touch the summits late in the day, towards 600m overnight.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 13th March 2026
Last updated
Wed 11th Mar 26 at
12:53PM
How windy? (On the summits)
West to southwesterly 35 to 45mph, likely strongest in the morning, squally gusts around showers.
Effect of the wind on you?
Challenging walking conditions over exposed higher terrain, considerable buffeting and significant wind chill.
How Wet?
Hail and snow showers, risk thunder
Showers with hail, probably merging into constant precipitation over a couple of hours - most likely in the afternoon. Snow falling to 300m in morning, then mostly confined above 500-600m with time. Risk isolated lightning.
Cloud on the hills?
Very extensive on higher areas - cloud base may drop during day
Cloud base frequently changing: at times shafts of cloud to 600m or lower near west coast, often capping mountains above 800m, but some breaks to the higher tops, more often Bala and Berwyn groups. Cloud base may lower further afternoon.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Brief bursts of sun, most often in east. Visibility varying between intermittently very good, and at least briefly appalling when in snow/hail and cloud.
How Cold? (at 900m)
-3C rising to -1C afternoon. Feeling like -12 to -15C directly in the wind.
Freezing Level
400 to 600m at first, rising toward 800m by early afternoon.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 14th March 2026
Last updated
Wed 11th Mar 26 at
12:53PM
How windy? (On the summits)
Southwesterly, ranging from 30 to 40 or perhaps 50mph. (Gradually strengthening through day, strongest Snowdon range.)
Effect of the wind on you?
Arduous walking where exposed across higher areas. Balance increasingly difficult. Significant wind chill.
How Wet?
Hail and snow showers.
Showers: may be frequent morning, but should gradually ease. Expect hail and above 600m, snow. Chance widespread precipitation by dusk.
Cloud on the hills?
Almost constantly covering higher tops
Varied cloud base: sometimes below 450m near precipitation but periods when most cloud above 600 to 800m (highest near and north of Ogwen valley and easternmost summits).
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of sun, mainly lower slopes. Hazy, and very poor visibility in snow.
How Cold? (at 900m)
-1C. Will feel as cold as minus 12C directly in the wind.
Freezing Level
750m
Planning Outlook
Further bouts of upland gales over the next few days. Precipitation on most mountains almost daily, focussed on western mountains. Freeze thaw cycles will occur: on the Scottish Highlands, thaw periods fairly brief and snow accumulating on many slopes. Further south, lying snow more intermittent as periods of thaw will be lengthier. Temperature levels will rise from about next Tuesday.