Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Cool to mild
Air temperature 8 to 12C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Cool to mild
Air temperature 8 to 12C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 19th August 2025
Last updated
Mon 18th Aug 25 at
4:31PM
Summary for all mountain areas
A cooler feeling day with a rather gusty east to north-east airflow. An extensive cloud sheet, with local drizzle, covering many hills from dawn, but some westernmost hills still clear. Low cloud will burn back to eastern and northern hills, with sun most widely in the west, but low cloud persisting for parts of coastal western Scotland.
Headline for Eryri / Snowdonia National Park
Breezy, feeling cooler. Cloud banks, mostly morning. Hazy sun best in the west.
How windy? (On the summits)
Easterly 15 to 20mph, but gusty 25-30mph around some higher tops and through elevated passes.
Effect of the wind on you?
Noticeably breezy and feeling cool in exposure, gusts may affect comfortable walking and balance on ridges.
How Wet?
Rain not expected
Cloud on the hills?
Some cloud in morning clearing
Patchy cloud banks in the morning mostly Carneddau group around to east and mid-Wales, tending to lift above most tops, may come and go above 800m for a few hours. Very little toward west coast.
Chance of cloud free summits?
60% rising to 90%
Sunshine and air clarity?
Hazy sun best in west all day, occasional hazy sun breaking through in east. Visibility very good.
How Cold? (at 900m)
11 to 13C, then dropping towards 8C overnight.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 20th August 2025
Last updated
Mon 18th Aug 25 at
4:31PM
How windy? (On the summits)
Northeasterly 15-25mph, occasional stronger gusts over tops and elevated passes.
Effect of the wind on you?
Fairly small, though buffeting gusts will blow over high terrain at times.
How Wet?
No rain expected
Cloud on the hills?
Increasingly clearing summits
From dawn, fairly extensive cloud above 700m, some banks drifting down east slopes near Carneddau/Tryfan. Cloud soon lifts to and above highest tops.
Chance of cloud free summits?
30% rising to 90%
Sunshine and air clarity?
From dawn, glimpses of sun, best in the west; becoming mostly sunny. Very good visibility, some haze east.
How Cold? (at 900m)
8 to 10C. Slopes towards mid-Wales locally warmer, up to 12C, particularly west.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 21st August 2025
Last updated
Mon 18th Aug 25 at
4:31PM
How windy? (On the summits)
North-easterly 20 to 30mph in morning, occasionally higher in gusts, but hour by hour easing down to 15mph afternoon.
Effect of the wind on you?
Blustery and gusty with marked wind chill in the morning. Becoming mostly small into the afternoon.
How Wet?
No rain expected
Cloud on the hills?
Capping tops, mainly north of A5.
Within a north-easterly airflow, cloud will likely cap fairly extensively hills near and north of the A5 for several hours. Elsewhere, occasional patches Snowdon.
Chance of cloud free summits?
40% north, 70% south.
Sunshine and air clarity?
Intermittent sun near and north of A5. More frequently elsewhere. Visibility very good or excellent.
How Cold? (at 900m)
7C at dawn, lifting to 11C
Freezing Level
Above the summits
Planning Outlook
High pressure centred toward the northwest this week, before building overhead again toward weekend. East to northeasterly winds prevailing, gusty for periods, easing out later in week. Extensively dry with sunshine best in west, low cloud for periods northern and eastern mountains with occasional drizzle. Still very dry underfoot with significant fire risk. Turning cooler through midweek, mountain temperatures falling, chilly into the valleys and glens pre-dawn, risk slight frost in Highland glens. Fine weather likely next weekend too; will likely begin to break down from the west into the following week, but uncertainty on timings of such a transition.