Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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.
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.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
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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.
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.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 13th May 2026
Last updated
Tue 12th May 26 at
4:35PM
Summary for all mountain areas
Cold for the time of year, with a cyclonic and unstable north-westerly bringing an increasingly widespread showery day across the hills. Showers heavy, with hail and risk of isolated thunder. Snow falling above around 700m. Gusty north-westerly winds, particularly strong and turbulent in and around the showers.
Headline for Eryri / Snowdonia National Park
Cold, windy and showery. Showers heavy, with hail and snow tops; risk thunder.
How windy? (On the summits)
West to northwesterly 30 to 45mph, gusts in excess of 50mph at times in and around showers.
Effect of the wind on you?
Significant wind chill, very blustery, strenuous walking on high terrain, buffeting gusts making balance challenging.
How Wet?
Showery, hail, snow high tops
Showers all day, most frequent toward coastal areas early morning, but soon widespread, heavy bursts with hail, risk isolated thunder; snow at times falling on tops mostly above 700m.
Cloud on the hills?
Varying over tops
Banks of cloud often covering higher areas in the north and west above 800m in the morning, tending to lift higher with breaks above even the higher tops, but ragged patches to 600m in showers.
Chance of cloud free summits?
60%
Sunshine and air clarity?
Brief bursts of sun and intermittently excellent visibility, but suddenly very poor during showers, appalling if in snow/hail and cloud on tops.
How Cold? (at 900m)
0C rising to 3C. Wind chill feeling like -12 to -15C.
Freezing Level
Around 900m early morning, rising above summits, but lowering briefly near high tops in showers.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 14th May 2026
Last updated
Tue 12th May 26 at
4:35PM
How windy? (On the summits)
North-westerly 15 to 25mph, but perhaps up to 30mph for western coastal hills.
Effect of the wind on you?
Feeling cold for mid May, with considerable chill in the north-westerly wind.
How Wet?
Showers developing widely, some hail.
Showers developing widely through day, some heavy with hail. May merge into longer spell of rain, or above 900m snow, later in the day.
Cloud on the hills?
Fairly extensive across the tops.
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.
Chance of cloud free summits?
30%
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
Freezing Level
1000m
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 15th May 2026
Last updated
Tue 12th May 26 at
4:35PM
How windy? (On the summits)
Northerly 15 to 25mph, strongest around dawn when perhaps 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.
A few showers, perhaps some hail, with snow over the tops initially. Showers well scattered and generally transfer through day from the coast to well inland.
Cloud on the hills?
Frequent patches covering tops
Frequent patches or banks of cloud will cover higher tops, especially in Snowdon Range. Elsewhere, rising bases, resulting in tops often clear.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Patchy sun, best early morning and west coast afternoon. Visibility very good, but lowering in showers.
How Cold? (at 900m)
1C
Freezing Level
Around 1000m
Planning Outlook
Staying notably chilly for mid-May through this week as air from the north-northwest prevails, with showers heavy at times and containing hail with snow over the tops, but over the weekend a front will edge in and bring a change to westerly winds. Next week may see ridging across England and Wales giving drier conditions, but occasional rain and blustery south-westerly winds for Scotland.