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.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Hazy, some fog banks
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Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
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.
Bright sunshine
Beware of sunburn from bright spring sunshine, despite feeling cool in any breeze on higher terrain.
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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.
Dry and sunny
Extensive sunshine. The mountains free of cloud once any early mist patches disperse.
Hazy, some fog banks
Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
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.
Bright sunshine
Beware of sunburn from bright spring sunshine, despite feeling cool in any breeze on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 21st March 2026
Last updated
Fri 20th Mar 26 at
3:45PM
Summary for all mountain areas
Cloud covering some western Scottish mountains much of day, a little rain or drizzle mostly Lochaber to Skye. Clearer hills east and southwards in the Highlands, and some breaks form in far northwest. Gusty winds toward north/west. Sunshine, haze and early low-level fog England & Wales, light winds.
Headline for Eryri / Snowdonia National Park
Light wind. Sun and early patchy fog.
How windy? (On the summits)
Variable 10mph or less. Evening into night, becoming southwesterly 15-20mph.
Effect of the wind on you?
Negligible.
How Wet?
Precipitation not expected
Cloud on the hills?
Early low-level fog clearing
Fog mostly confined to valleys in the morning, rare fragments briefly rising upslope on eastern hills, otherwise the mountains clear.
Chance of cloud free summits?
Practically certain
Sunshine and air clarity?
Mostly sunny, thin high cloud. Hazy low-level views, clearer air higher up.
How Cold? (at 900m)
7C, rising slightly into afternoon.
Freezing Level
Above the summits, but patchy frost in valleys and sheltered higher areas around dawn.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 22nd March 2026
Last updated
Fri 20th Mar 26 at
3:45PM
How windy? (On the summits)
Westerly or variable, 15 to 20mph, lower speeds for periods toward mid-Wales.
Effect of the wind on you?
Fairly small.
How Wet?
Risk a little rain afternoon
A few spots of rain as high cloud thickens, mainly into the afternoon.
Cloud on the hills?
Early fog clearing, patchy cloud west
Some areas of fog in valleys and lower hill slopes in the morning, briefly drifting upslope, but clearing. Occasional cloud caps drift over higher tops in northwest, filling in later afternoon on some tops.
Chance of cloud free summits?
70%
Sunshine and air clarity?
Mostly sunny morning, giving way to some thickening high cloud from northwest, becoming more overcast with time. Visibility good, but some haze.
How Cold? (at 900m)
5 to 7C, likely warmest in morning.
Freezing Level
Above the summits. Slight frost inland valleys at dawn.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 23rd March 2026
Last updated
Fri 20th Mar 26 at
3:45PM
How windy? (On the summits)
Variable becoming SW'ly, 10-15mph or less in morning, tending to strengthen to 25-30mph, after dark 40mph+.
Effect of the wind on you?
Small possibly onward into early afternoon, then becoming more blustery, likely to deteriorate into evening to gales on tops.
How Wet?
Precipitation not expected
Cloud on the hills?
Little if any
Chance of cloud free summits?
90%
Sunshine and air clarity?
Sunshine tending to weaken as high cloud thickens, may become obscured afternoon. Visibility excellent.
How Cold? (at 900m)
0C rising to 4C by late afternoon. As wind increases, chill factor later feeling like -5C in exposure.
Freezing Level
Close to freezing above 800m, plus frost inland valleys around dawn. Lifting above freezing to tops by middle of day.
Planning Outlook
A changeable mix during the week ahead, but feeling wintry with snow and hail showers widely into midweek. Fine conditions on Monday, but southwesterly winds increasing, later severe gales on Scottish mountains. A spell of rain by late Monday into the night with a brief rise of temperature, but the freezing level drops from the northwest again into Tuesday, falling sub-zero across all hills of Britain above 600-700m later Tuesday into Wednesday. Significant chill factor from gale force west then northwesterly winds. High pressure to the southwest then likely rebuilds to settle things again toward next weekend and temperatures will tend to recover. A mixed west to southwesterly flow may continue to bring more changeable conditions to west and northwest Scotland.