Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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 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.
Click an icon for more information or click here for a key to all icons.
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
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 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.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 29th August 2025
Last updated
Thu 28th Aug 25 at
4:30PM
Summary for all mountain areas
Rain frequent or persistent for western Scotland most of the day, some slow-moving heavy bursts, these extending increasingly eastwards over the Highlands. Clusters of showery rain over western England and Wales will drift eastwards during the day on fresh and gusty winds.
Headline for Eryri / Snowdonia National Park
Showery spells, brisk winds.
How windy? (On the summits)
Westerly 20-30mph, occasional stronger gusts over high terrain in showers.
Effect of the wind on you?
Walking impeded at times; balance challenged in strong gusts over tops.
How Wet?
Showers
Frequent or persistent rain western Snowdonia and mid-Wales in morning, breaking into a scattering of showers passing eastward, some heavy bursts, chance isolated thunder.
Cloud on the hills?
Tending to improve though variable
From dawn, fairly extensive from middle slopes up west of highest tops, variable banks to lower slopes. More broken and higher bases forming, best toward east, but cloud often capping western tops above 800m.
Chance of cloud free summits?
20% rising to 60%
Sunshine and air clarity?
Sunshine in and out east of high tops with very good visibility; little or no sunshine west/coastal areas where visibility often poor.
How Cold? (at 900m)
8 to 10C. Feeling near/below freezing in the wind on tops.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 30th August 2025
Last updated
Thu 28th Aug 25 at
4:30PM
How windy? (On the summits)
Southerly soon 30mph morning, rising to 60-70mph middle of day, stronger gusts over tops. Later W-SW'ly 45-60mph.
Effect of the wind on you?
Deteriorating; walking rapidly becoming difficult, severe conditions for a time on higher terrain. Significant wind chill.
How Wet?
Widespread persistent rain, may break
Largely dry dawn, lasting longest further east, but rain sets in widely from west during morning, increasingly heavy with a risk of torrential downpours. Tending to break into showers during afternoon.
Cloud on the hills?
Extensive, breaking somewhat after rain
Fairly extensive from middle slopes up with variable patches on low slopes, filling in more extensively during rain. Once rain clears, cloud becoming more patchy, many slopes increasingly clear east. Cloud may cling to higher western slopes.
Chance of cloud free summits?
10%
Sunshine and air clarity?
No sunshine and poor visibility well into the day. After rain clears, patchy sun with good visibility, best east.
How Cold? (at 900m)
9C, rising in middle of day to 12C; cooling again later. Feeling below freezing in direct wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 31st August 2025
Last updated
Thu 28th Aug 25 at
4:30PM
How windy? (On the summits)
South to southwesterly 40 to 50mph, risk 60mph at least in gusts for periods over higher mountains.
Effect of the wind on you?
Arduous walking conditions widely, often difficult mobility on highest terrain, gusts could knock you over.
How Wet?
Heavy showers
Bursts of rain throughout the day, most frequent toward west coast early morning, but increasingly widespread. Risk of isolated thunder.
Cloud on the hills?
Varied over tops
Cloud base varying, often covering higher terrain above 800m, sometimes 600m toward coast, patches elsewhere in rain. Breaks occasionally higher up.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Brief glimpses of sun. Visibility good away from showers, but general haze.
How Cold? (at 900m)
8 or 9C, little change all day. Wind chill feeling below freezing, near -5C in exposure on highest summits.
Freezing Level
Above the summits
Planning Outlook
An unsettled weekend ahead driven by low pressure to the west/north of Scotland. Brisk westerlies will drive showery rain onto western mountains, at times drifting eastwards. Some local thundery downpours may arise. Saturday in particular will be very windy with widespread risk of gales and heavy rain setting in from the southwest. Sunny periods will arise between weather features, greatest chance in eastern areas later in the weekend and early next week. Next week stays mixed with low pressure in charge, frequent rain or showers continuing. Some improvement later in the week as pressure tends to rise.