Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday'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.
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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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.
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 9th September 2025
Last updated
Mon 8th Sep 25 at
4:13PM
Summary for all mountain areas
Windy near west coasts of Scotland and Wales, risk of gales over high tops later in the day; local cloud and light morning rain, then dry and largely clear. Some morning light rain and cloud for Lakeland too, also clearing. Mostly clear hills east Scotland though blustery. Mostly sunny and warm along the Pennines.
Headline for Eryri / Snowdonia National Park
Patchy morning cloud mostly clears; increasingly windy
How windy? (On the summits)
Southerly 25-30mph through morning. Rising towards afternoon 30-35mph and shifting somewhat southeasterly; highest tops and westernmost mountains may reach 45mph later in the day
Effect of the wind on you?
Comfortable walking becoming affected, increasingly strenuous through afternoon. Stability will become challenged on exposed tops. Feeling cool.
How Wet?
Little rain expected
Spots of drizzly rain may affect slopes near the Llyn Peninsula in the morning. Small risk of isolated showery rain from the west late in the day though possibly staying entirely dry.
Cloud on the hills?
Likely clearing summits for several hours
From dawn, local fog patches in sheltered valleys with variable banks upslope, high ground likely shrouded early. Cloud lifts and breaks to clear many summits through much of afternoon. Later in the day, cloud tending to return to high terrain.
Chance of cloud free summits?
90% for much of the day
Sunshine and air clarity?
Patchy sunshine though weakened by high cloud; likely little sun by later afternoon. Very good visibility.
How Cold? (at 900m)
8C rising to 10C. Inland mountains towards mid-Wales may reach 11C.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 10th September 2025
Last updated
Mon 8th Sep 25 at
4:13PM
How windy? (On the summits)
Southerly 25-35mph, stronger gusts over high tops. Shifting southwesterly afternoon into evening, may ease somewhat.
Effect of the wind on you?
Walking strenuous on high terrain - attention to balance needed in exposure. Considerable wind chill.
How Wet?
Showery rain, more frequent afternoon
Showery rain on-and-off most of the day. Showers tending to merge into broader areas of rain with heavy bursts during afternoon.
Cloud on the hills?
Extensive, some variability
Extensive over high terrain from dawn with banks down to lower slopes south and west of Snowdon. Higher bases around Glyder Fawr towards Carneddau. Bases will vary in and out of rain, at times extensive down to middle slopes.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Sunshine unlikely. Mostly poor visibility in rain.
How Cold? (at 900m)
8 or 9C. Feeling near freezing in strongest wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 11th September 2025
Last updated
Mon 8th Sep 25 at
4:13PM
How windy? (On the summits)
Southwesterly 30-40mph; some stronger winds over highest tops at times.
Effect of the wind on you?
Strenuous walking. Considerable buffeting over highest tops will challenge stability. Significant wind chill.
How Wet?
Showers, at times frequent and heavy
Frequent showers on high ground and west slopes facing Cardigan Bay, at times merging into persistent rain with heavy bursts. Showers drift inland, at times frequent and heavy with risk of hail.
Cloud on the hills?
Fairly extensive over high terrain
Likely extensive over high terrain much of the day with variable bases to middle or lower slopes during heaviest rain in the west. Occasional breaks to higher terrain east of Snowdon group possible.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Often cloudy - some glimpses of sun east. Visibility often poor in rain.
How Cold? (at 900m)
5 to 7C. Feeling like -5C in direction strongest wind.
Freezing Level
Above the summits
Planning Outlook
Low pressure over the north Atlantic dominates the weather pattern for the week ahead, maintaining unsettled conditions. West to southwesterly winds prevail bringing frequent rain and cloud to western areas, regularly becoming more widespread as weather features come and go. Breaks may form with some bursts of sunshine, though likely short lived. Early indications suggest a deeper area of low pressure late weekend and early next week will bring widespread gales, possibly severe on highest terrain. Becoming more mixed after mid-month with longer periods of dry weather, but a persistent southwesterly regime will continue to draw unsettled spells of weather into Britain, notably in the north.