Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Clear
Excellent or superb visibility, no navigation issues.
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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Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
Clear
Excellent or superb visibility, no navigation issues.
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
Sunday 10th May 2026
Last updated
Sat 9th May 26 at
4:00PM
Summary for all mountain areas
Increasingly windy across the Highlands, rain and some sleet or snow on high tops moving in from the northwest, becoming persistent. By late in the day, snow falling in northern areas to lowering elevations. Chilly NE'ly wind England & Wales tends to ease, a largely fine day, early light rain east Wales.
Headline for Eryri / Snowdonia National Park
Brisk gusty wind. Generally dry with sun, hills clear or clearing.
How windy? (On the summits)
Northeasterly 25 to 30mph and notably gusty particularly morning; speeds tend to lessen a little with time toward 20mph. Shifting northerly into evening onward, 25mph, local 30mph west coast hills.
Effect of the wind on you?
Blustery with considerable wind chill at least in morning. Gusty spots affect ease of walking and balance on ridges, some lessening into afternoon for a time.
How Wet?
Any early local dampness soon fades
Localised brief spots of drizzle or light rain early in the day, mainly eastern hills, soon fading to leave a dry day.
Cloud on the hills?
Local banks clearing
Cloud banks mostly drifting over east and northern tops in the morning, mostly above 600-700m, tending to lift higher and increasingly all break up.
Chance of cloud free summits?
70% at first, rising above 90%.
Sunshine and air clarity?
Fairly cloudy in east in morning, some sunny breaks toward the west coast; sunnier widely into afternoon. Visibility very good or excellent.
How Cold? (at 900m)
2C rising to 5C afternoon. Feeling as cold as -8C directly in the wind in morning, -3C afternoon.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 11th May 2026
Last updated
Sat 9th May 26 at
4:00PM
How windy? (On the summits)
North-northwesterly 20-25mph, may ease a little afternoon, turning toward west-northwesterly by dusk onward.
Effect of the wind on you?
Fairly small, but blustery in exposure on higher tops and ridges, distinctly chilly especially in the morning.
How Wet?
Local showers
Brief showers mostly near north coast in morning, snow flurries on higher tops. One or two showers forming inland into afternoon.
Cloud on the hills?
Lifting and largely clearing
Some cloud banks drifting over tops mainly in northern areas above 700m early in day. Lifting higher up during morning and breaking above the summits.
Chance of cloud free summits?
60% morning, rising to 90% afternoon.
Sunshine and air clarity?
Patchy sunshine develops. Visibility excellent.
How Cold? (at 900m)
2C early morning, rising to 4C afternoon. Feeling like -6C in the wind in morning.
Freezing Level
Close to freezing on highest summits early in day, then rising further above the tops.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 12th May 2026
Last updated
Sat 9th May 26 at
4:00PM
How windy? (On the summits)
Westerly 25 to 40mph, squally gusts around showers.
Effect of the wind on you?
Frequent buffeting across higher mountains, affecting balance on exposed ridges. Considerable wind chill.
How Wet?
Rain for a time, showers
A band of showery rain moving southeast during the day, may be frequent or more persistent rain over an hour or more in west. Later scattered showers.
Cloud on the hills?
Covering tops for a time, clearing
Cloud banks drifting over higher slopes, may persist for a few hours around rain, then lifting higher with increasing breaks afternoon.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Occasional sun. Visibility often very good, but reduced in rain or showers.
How Cold? (at 900m)
2 to 4C. Feeling as cold as -8C directly in the wind on tops.
Freezing Level
Above the summits.
Planning Outlook
Notably chilly across the hills for this time of year during the week ahead as air from the north-northwest prevails. Frequently near or below freezing over Scottish Munros, and at times dropping to freezing on high tops in England and Wales. Wind speed will vary, but increasing at times to gale force on hills, giving significant chill factor. Broadly showery, heavy bursts with hail and thunder in places, also often falling as snow on higher mountains, at least in Scotland, intermittently elsewhere. Some more persistent precipitation especially northwest Scotland. Also some drier windows - varying locally day-to-day - away from showers cloud will lift above hills and visibility will be very good.