Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today'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.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra 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.
Sunshine and showers
A good amount of dry and bright weather, but scattered bursts of rain, some may be locally heavy.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 16th September 2025
Last updated
Mon 15th Sep 25 at
4:31PM
Summary for all mountain areas
Strong upland winds across the UK in the morning will ease from the west into the afternoon. Frequent showers in west-coastal regions; more scattered inland with the Peak District and Cairngorms National Parks becoming or staying largely dry. Extensive cloud on most high ground. Temperatures feeling cool.
Headline for Eryri / Snowdonia National Park
Upland gales, easing. Showery
How windy? (On the summits)
Westerly 35 to 45mph at first, strongest over the tops, easing down into the afternoon to 25mph and later 20mph near the west coast.
Effect of the wind on you?
Arduous conditions through morning, perhaps difficult for a time, significant wind chill. Easing into the afternoon.
How Wet?
Scattered showers
A scattering of showers coming and going for several hours, tending to ease off for a drier afternoon. More rain arriving evening into night from the southwest.
Cloud on the hills?
Frequent on upper slopes, lifting to tops.
Frequent cloud covering upper slopes of the hills from dawn. Gradual rise of the bases to tops, where there will be intermittent clearing in the afternoon.
Chance of cloud free summits?
20% lifting to 60%
Sunshine and air clarity?
A little hazy patches of sun, through an increasing veil of high cloud. Becoming overcast. Visibility good or very good.
How Cold? (at 900m)
7C. Feeling below freezing in the wind, near -5C high tops.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 17th September 2025
Last updated
Mon 15th Sep 25 at
4:31PM
How windy? (On the summits)
Still some uncertainty: Southwesterly 50mph+ in the morning, easing slightly to 35 to 40mph by midday.
Effect of the wind on you?
Arduous conditions, affecting ease of walking and balance on ridges for much of the day. Conditions more difficult in the morning.
How Wet?
Persistent rain morning, may fade
Very wet underfoot and streams in spate after overnight rain. Rain fairly persistent, possibly heavy for a few hours in the morning. Chance of constant rain continuing, but likely to ease to drizzle or fade completely in the afternoon.
Cloud on the hills?
Fairly extensive
Cloud likely to cover higher slopes most or all day, at times blanketing hills to mid-slopes during rain. Chance of lifting a little.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Generally overcast, varied layers of cloud. Visibility reduced by rain, at times poor; some possible improvement if rain eases.
How Cold? (at 900m)
8 to 10C. Feeling sub-zero in the wind, nearer -5C in stronger speeds.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 18th September 2025
Last updated
Mon 15th Sep 25 at
4:31PM
How windy? (On the summits)
Forecast details very uncertain. Southwesterly 40 to 50mph, risk sustained 60mph+. Powerful turbulent gusts.
Effect of the wind on you?
Difficult walking conditions will make progress challenging. Very powerful gusts, especially in passes, may easily blow you over. Marked wind chill.
How Wet?
Probably persistent, heavy west
Persistent rain or heavy rain likely, particularly western areas. Chance of remaining substantially dry toward Berwyn mountains, possibly drier elsewhere for a time as position of front is uncertain at this stage.
Cloud on the hills?
Extensive where raining
Extensive cloud down to lower west-coastal slopes where in rain. Regions that remain dry will likely have higher cloud base, above many eastern hills.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Little or no sunshine in many places. Hazy, poor visibility in rain; locally better visibility toward east and north of the A5.
How Cold? (at 900m)
11C. Feeling around or below 0C in the wind.
Freezing Level
Well above the summits.
Planning Outlook
An ongoing unsettled outlook generally dominated by low pressure. Extensive rain and gales into midweek, likely wettest on west-coastal regions. Areas of rain and showers frequently in the forecast later in the week. Temperatures near-average, but feeling cool when exposed to wind. A chillier northwesterly may emerge by next weekend, briefly dropping near freezing on highest Scottish tops. Indications then favour higher pressure at least briefly expanding northwards early next week for some drier days, but unlikely to settle down for long.