Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Saturday's Forecast
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
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.
Clear
Excellent or superb visibility, no navigation issues.
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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Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
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.
Clear
Excellent or superb visibility, no navigation issues.
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
Saturday 20th June 2026
Last updated
Fri 19th Jun 26 at
2:47PM
Summary for all mountain areas
Windy with a few drizzly showers and low cloud N and W Scotland. Elsewhere, fairly light wind (particularly Wales and S Pennines), and extensively dry. Widespread fog will clear most summits - although patches of fog lower slopes near some west coasts.
Headline for Eryri / Snowdonia National Park
Fog, all or almost alll clearing the hills. Light wind.
How windy? (On the summits)
Southwest to westerly 10mph.
Effect of the wind on you?
Negligible
How Wet?
Rain not expected
Cloud on the hills?
Mountains starting foggy, but clearing
Improving markedly as fog across the hills lifts to clear during the morning. However, coastal cliffs and slopes, mainly Lleyn peninsula may see pockets of fog at times throughout the day below 300m. (Higher areas above the fog).
Chance of cloud free summits?
20% rising to be almost certain
Sunshine and air clarity?
Patchwork of sun developing. Visibility excellent.
How Cold? (at 900m)
9C to 11C morning; rising inland as high as 14C afternoon.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 21st June 2026
Last updated
Fri 19th Jun 26 at
2:47PM
How windy? (On the summits)
East to southeasterly or variable, often 10mph or less.
Effect of the wind on you?
Negligible.
How Wet?
Rain unlikely
Chance of odd spots from high cloud, possibly a very remote brief burst of rain mainly in afternoon.
Cloud on the hills?
Hills clear
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Periods of sunshine weakened or giving way at times by areas of high cloud. Visibility excellent or superb although some haze later in day.
How Cold? (at 900m)
12C at dawn, rising to 15 to 18C afternoon.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 22nd June 2026
Last updated
Fri 19th Jun 26 at
2:47PM
How windy? (On the summits)
South to southwesterly between 15 and 25mph.
Effect of the wind on you?
Fairly small
How Wet?
Risk thunderstorm
Confidence low: it may remain dry. But risk of a few busts of rain, perhaps brief although later in day thunderstorms may develop.
Cloud on the hills?
Very little for most of the day - may form in rain.
Generally the hills free of cloud although fog may form higher slopes in rain.
Chance of cloud free summits?
90%
Sunshine and air clarity?
Patches of sunshine although extensive high level cloud. Visibility good, although a haze.
How Cold? (at 900m)
19C - very warm and also very humid indeed.
Freezing Level
Above the summits
Planning Outlook
Extensively dry and very warm indeed England and Wales although around Monday chance of thunderstorms. Rain and low cloud at times Scotland, mainly affecting western mountains - although later next week the warmth further south may penetrate north into or perhaps to all Scotland.