Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Sunday'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.
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.
Hazy, some fog banks
.jpg "Hazy, some fog banks"){kind=icon}
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.
Click an icon for more information or click here for a key to all icons.
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.
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.
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.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 22nd March 2026
Last updated
Sat 21st Mar 26 at
4:00PM
Summary for all mountain areas
A band of patchy rain and low cloud moves southeastwards, improving with rising cloud bases across the Highlands, but brisk winds and below freezing on higher terrain - snow showers mostly in northwest. England & Wales start with low-level fog, hazy sun then cloud lowering, a little rain develops.
Headline for Eryri / Snowdonia National Park
Low-level fog clears, weak sun then cloudier, local rain spots.
How windy? (On the summits)
Westerly or variable, 15mph or less in morning, particularly toward mid-Wales. Increasing into afternoon, northwesterly 15-20mph, northerly 20-25mph up to dusk.
Effect of the wind on you?
Fairly small, but feeling breezier with time.
How Wet?
A little rain afternoon
A few spots of rain as high cloud thickens, mainly into the afternoon, may become drizzly over coastal hills for an hour or so afternoon.
Cloud on the hills?
Early fog clearing, later cloud some tops
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 west and northern tops above 700m.
Chance of cloud free summits?
90%, dropping later to 40%
Sunshine and air clarity?
Mostly sunny start, weakening sun as high cloud thickens from northwest, becoming more overcast with time. Visibility good, but some haze; reduced if rain occurs locally later.
How Cold? (at 900m)
5 or 6C, dropping later, after dark to 1 or 2C. Feeling like 0C during day as breeze freshens.
Freezing Level
Above the summits. Slight frost inland valleys at dawn. Dropping by evening-night to 1000m.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 23rd March 2026
Last updated
Sat 21st Mar 26 at
4:00PM
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?
Fairly small up to early afternoon, but 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.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 24th March 2026
Last updated
Sat 21st Mar 26 at
4:00PM
How windy? (On the summits)
Southwesterly 45 to 60mph, risk 70mph higher mountains for a few hours during day.
Effect of the wind on you?
Difficult conditions across the mountains, any mobility challenging in exposure. Significant wind chill.
How Wet?
Drizzly rain, later heavier
Rain on and off at least, more persistent western hills, mixed with drizzle. With time, increasingly setting in for steadier and heavier rain, perhaps only later afternoon. Finishing as snow on tops into evening.
Cloud on the hills?
Extensive
Shrouding the hills widely, from lower elevations upward near west coast. Higher bases mostly above 600m northeastern areas from Ogwen valley.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Generally cloudy, some brighter moments mainly morning and in east Wales. Visibility good if dry below cloud, becoming poor then very poor later in rain.
How Cold? (at 900m)
4C in morning, lowering later in day to 0C. Feeling like -12 to -15C in the wind.
Freezing Level
Above the summits, then later afternoon dropping onto tops, 800m by dusk, then 600m after dark.
Planning Outlook
A fine start to the week for many places, but strengthening winds and a spell of heavy rain arriving from the northwest during Monday advances southwards into Tuesday. Cold, wintry conditions follow across the mountains into midweek, 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. Showery hail and snow falling toward lower elevations. 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 likely continues to bring more changeable conditions to west and northwest Scotland.