Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Cool
Air temperature just above freezing to higher summits. May feel pleasant on lower ground or when climbing, but feeling chilly on tops when stationary or where exposed to wind. Take appropriate 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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Cool
Air temperature just above freezing to higher summits. May feel pleasant on lower ground or when climbing, but feeling chilly on tops when stationary or where exposed to wind. Take appropriate layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 12th September 2024
Last updated
Wed 11th Sep 24 at
2:12PM
Summary for all mountain areas
Very cold for September; hail and snow in showers across the mountains in Scotland, and hail and sleet highest tops Snowdon range (where precipitation frequent). Elsewhere, a few brief showers and frequent bright sunshine. Nevertheless, feeling well below freezing point across the mountains directly in the wind.
Headline for Eryri / Snowdonia National Park
Feeling very cold in the wind. Showery rain, most frequent Snowdon range
How windy? (On the summits)
Northwesterly, 25 to 30mph, perhaps at times in morning 35mph on highest tops Snowdon range. Overall will drop slowly through the day.
Effect of the wind on you?
Will impede ease of walking on higher areas, and intermittently buffeting considerable. Marked wind chill.
How Wet?
Showers, most frequent north
Showers; or north from Snowdon rain sometimes almost constant, and at times heavy. Generally improving afternoon as showers become fewer. Sometime hail or on highest tops sleet. Few, mostly brief showers mid Wales.
Cloud on the hills?
Extensive across the mountains. Sometimes clearing mid Wales
Cloud base will vary; for periods forming on lower slopes north from Snowdon and rarely clearing above 750m. In mid Wales, cloud base higher, by late morning, rarely below 600m, and increasingly confined to or sometimes above highest tops..
Chance of cloud free summits?
10% Snowdon range to rising to by late morning 70% elsewhere
Sunshine and air clarity?
Little or no sun north from Snowdon; the sun in and out 'elsewhere'. Persistent haze; and poor visibility in rain
How Cold? (at 900m)
3 to 5C, felling sub-zero if exposed to wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 13th September 2024
Last updated
Wed 11th Sep 24 at
2:12PM
How windy? (On the summits)
West backing southwesterly, 10mph.
Effect of the wind on you?
Negligible
How Wet?
Isolated brief showers
Extensively dry; although the odd shower Snowdon range morning
Cloud on the hills?
Very little by late morning
Cloud covering some higher slopes after dawn will more or less lift above the summits by late morning.
Chance of cloud free summits?
90% by midday
Sunshine and air clarity?
Sunny periods morning, later sun weakening through higher cloud. Excellent visibility.
How Cold? (at 900m)
3C rising to 6 to 10C, warmest eastern summits.
Freezing Level
Above the summits, frost at dawn in some valleys.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 14th September 2024
Last updated
Wed 11th Sep 24 at
2:12PM
How windy? (On the summits)
Southwesterly typically 30mph; may reach 40mph on highest tops Snowdon range. Mostly 25mph mid- Wales.
Effect of the wind on you?
Walking arduous particularly on exposed higher areas where balance may be difficult in places. Considerable wind chill.
How Wet?
Drizzly rain, mainly near west coast
Lleyn peninsula to western slopes of Snowdon: Drizzle from time to time. Elsewhere: perhaps a 'feel' of drizzle rarely.
Cloud on the hills?
Very extensive, particularly western hills.
Lleyn peninsula to western slopes of Snowdon: Fog from lower slopes up. Elsewhere: Cloud base higher, typically between 600 and 800m.
Chance of cloud free summits?
20%
Sunshine and air clarity?
A little sun may come through mainly lower slopes. Visibility often good, but misty in drizzle.
How Cold? (at 900m)
7C. Will feel near freezing point directly in the wind.
Freezing Level
Above the summits.
Planning Outlook
Turning warmer from the weekend. Very little rain for a week to ten days (perhaps longer) for England and Wales, but in Scotland, particularly western mountains, rain (mainly Saturday and Monday - although the precise timing uncertain), Around Tuesday the fine warm water will extend across Scotland.