Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday's Forecast
Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Chilly
Air temperature below +5C on higher summits. Feeling distinctly chilly on tops when stationary or where exposed to wind. Take appropriate layers.
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Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Chilly
Air temperature below +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
Monday 26th May 2025
Last updated
Sun 25th May 25 at
4:00PM
Summary for all mountain areas
Gales widespread over the mountains, during afternoon in Wales strengthening to become increasingly severe on tops. Showery bursts, most frequent in the west, hail and isolated thunder. Merging into constant and heavier rain for England, Wales and southwest Scotland later.
Headline for Eryri / Snowdonia National Park
Windy, severe gales later; showers then heavier rain.
How windy? (On the summits)
Southwesterly 30 to 35mph, strengthening to reach 50mph during afternoon, 60mph on high tops into evening.
Effect of the wind on you?
Frequent buffeting across the hills, making balance difficult on exposed ridges; deteriorating further to become widely difficult later. Significant wind chill.
How Wet?
Showers; constant rain later
Showers from dawn in coastal areas, soon extending inland in the morning. Through afternoon, developing into more persistent rain, setting in heavier, continuing into evening
Cloud on the hills?
Varied on tops, lowering to become extensive
Frequently capping higher summits above 800m, at times 600m near coast in showers. Some breaks higher up, best in east. Lowering generally over higher terrain as rain becomes persistent.
Chance of cloud free summits?
30%, by later afternoon 10%
Sunshine and air clarity?
Glimpses of sun mostly east in morning. Visibility very good for periods, briefly poor in showers, reducing generally to poor later.
How Cold? (at 900m)
3C rising to 5C. Wind chill feeling like -8C on tops.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 27th May 2025
Last updated
Sun 25th May 25 at
4:00PM
How windy? (On the summits)
West to southwesterly 20-25mph early morning, easing briefly, turning southerly. Strengthening rapidly to 50mph later.
Effect of the wind on you?
Fairly small morning, but deteriorating conditions afternoon-evening, may become difficult as gales develop and increase.
How Wet?
Heavy rain developing, setting in
Largely dry start, but rain likely developing through morning from southwest -some uncertainty of timing - but by middle of day threat of heavy rain setting in, continuing afternoon into evening.
Cloud on the hills?
Mostly little, then becoming extensive
Patches of cloud mostly higher and western tops in the morning; many tops clear or clearing for a few hours. As rain develops, cloud lowering to blanket hills to increasingly low levels.
Chance of cloud free summits?
70%, during afternoon dropping to 10%
Sunshine and air clarity?
Glimpses of sun soon giving way as high cloud builds, becoming overcast. Visibility starting very good, then poor later as rain develops.
How Cold? (at 900m)
5C rising to 8C. Feeling colder as wind speeds increase, later may feel sub-zero where exposed.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 28th May 2025
Last updated
Sun 25th May 25 at
4:00PM
How windy? (On the summits)
West to northwesterly 20 to 25mph, risk 30-35mph for a few hours from dawn.
Effect of the wind on you?
Starting to affect comfortable walking where exposed on higher terrain. More blustery at first. Marked wind chill.
How Wet?
Showers mostly early in day
Showery rain from overnight may continue into early morning before clearing, leaving brief passing light showers. Into night, risk of heavy rain moving in from the west.
Cloud on the hills?
Lifting and clearing
Patches capping some high tops in the morning, possibly fairly extensive at dawn, but soon mostly above 800m. Lifting to clear the tops by middle of day.
Chance of cloud free summits?
60% rising above 90%
Sunshine and air clarity?
Broken cloud and sun; cloud filling in for periods, sunnier later near coasts. Visibility very good.
How Cold? (at 900m)
4C rising to 7C. Wind chill feeling sub-zero in morning, risk nearer -5C at first.
Freezing Level
Above the summits
Planning Outlook
Changeable conditions this week with low pressure and frontal systems passing west to east. West to southwesterly winds prevailing, speeds varied, but gale force for periods on the mountains. Spells of rain and showers, some periods of sustained heavier rain. Cloud often shrouding higher terrain. Better toward the east and northeast of Scotland. Generally rather cool for Scotland, near freezing on highest summits early in week, then a little milder, or warmer further south over England & Wales. Some improvements in conditions especially in southern areas as pressure builds at times, but mixed westerlies are likely to prevail into the start of June.