Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Thursday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Heavy snow and hail showers, isolated lightning
Showery precipitation, often heavy, may merge to become constant for periods. A mix of snow and hail often falling to lower slopes. Risk of very localised thunder and lightning.
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.
Heavy snow and hail showers, isolated lightning
Showery precipitation, often heavy, may merge to become constant for periods. A mix of snow and hail often falling to lower slopes. Risk of very localised thunder and lightning.
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 14th May 2026
Last updated
Wed 13th May 26 at
4:30PM
Summary for all mountain areas
Another cold day for May with considerable chill factor in exposure to brisk northerly winds. Showers focused on north-facing areas in the morning, but forming increasingly widely, falling as snow on Scottish Munros, at times higher tops elsewhere; heavy bursts with hail, isolated thunder.
Headline for Eryri / Snowdonia National Park
Cold and windy. Showery, hail, snow high tops; isolated lightning.
How windy? (On the summits)
Northwesterly 25 to 30mph, stronger squally gusts in showers. Tending to increase later in daytime, in places 35-40mph on higher western tops.
Effect of the wind on you?
Considerable wind chill for mid-May. Ease of walking and sometimes balance affected on exposed high terrain. More challenging in places toward evening in west.
How Wet?
Showers, some hail, snow high tops, risk thunder
Showers most frequent near to north facing coasts in morning, but extending well inland and developing widely, some heavy with hail. Some more constant rain, or above 900m snow. Risk isolated thunder & lightning.
Cloud on the hills?
Fairly extensive, lifting higher
In the north-westerly wind, whilst the cloud bases will vary, they will frequently cover higher terrain above 700-900m, patches to 500-600m at times. Better breaks afternoon as bases rise higher.
Chance of cloud free summits?
30% rising to 60% afternoon.
Sunshine and air clarity?
Sun limited mostly to well inland early in the day, then as fleeting glimpses between the showers. Visibility very good, but poor in showers.
How Cold? (at 900m)
1C, up to 3C afternoon inland. Feeling like -10C directly in wind.
Freezing Level
1000m in morning, rising just above high tops into afternoon.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 15th May 2026
Last updated
Wed 13th May 26 at
4:30PM
How windy? (On the summits)
Northerly 20 to often 25mph high tops, stronger around dawn when some tops up at 30mph.
Effect of the wind on you?
May impede walking at times, mainly in the morning when the wind chill factor will be most pronounced.
How Wet?
A few showers, transferring inland.
Scattered showers most common over north-facing coastal hills early in day, briefly falling as snow on high tops, some hail; tending to push inland and become fewer as the day goes on.
Cloud on the hills?
Varying, then rising to clear tops
Frequent patches or banks of cloud will cover higher tops, especially in Snowdon range in the morning. Bases tending to rise to increasingly clear most or all tops.
Chance of cloud free summits?
50% rising to 80%
Sunshine and air clarity?
Patchy sun, best early morning inland, then improving near west coast afternoon. Visibility very good, briefly lowering in showers.
How Cold? (at 900m)
1 or 2C. Feeling near -10C directly in early wind.
Freezing Level
Around 1000m in morning, rising just above tops afternoon.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 16th May 2026
Last updated
Wed 13th May 26 at
4:30PM
How windy? (On the summits)
West or southwesterly 10-15mph, increasing gradually to 15-20mph, later in day 20-25mph.
Effect of the wind on you?
Mostly small, but starting to feeling more noticeably breezy later.
How Wet?
Rain develops
One or two brief showers may develop, otherwise largely dry until later afternoon. Patchy rain moving in from west, risk becoming more persistent later western areas, extending further inland.
Cloud on the hills?
Lowering onto tops in rain later
Patchy cloud banks form on some slopes in morning, mainly western areas, lifting and clearing for a time. As rain develops, cloud tending to fill in with time over higher slopes, soonest west.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Sun weakens as high cloud thickens during day, more overcast afternoon. Visibility excellent, reducing near coast as rain develops.
How Cold? (at 900m)
1C rising to 4C afternoon.
Freezing Level
Close to freezing on higher tops above 900m, plus frost inland valleys at dawn. Rising further above freezing to tops.
Planning Outlook
Becoming gradually less cold into the weekend as northerly winds ease and then switch toward west-southwesterly. Fewer showers by Friday with sunny spells. A dry start to Saturday, frost at dawn where skies are clear. Rain and lowering cloud moves onto west coast areas during Saturday, persistent rain later western Scotland. By Sunday and Monday, areas of showery rain will pass eastwards during the daytimes, leaving western areas generally drier with cloud breaks afternoon-evenings. South-southwesterlies then prevail for a few days next week, with rain at times Tuesday and Wednesday on western hills, particularly Scotland. A drier and warmer theme later in the week as higher pressure builds.