Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday's Forecast
Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Snow and hail showers
Periods of bright or sunny conditions mixed with showers or flurries of snow and hail. Visibility may change rapidly from excellent to very poor.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Terrain widely frozen
All ground frozen from lower elevations upward, with hard frost or snow cover. Beware of icy surfaces on lower and higher terrain. Appropriate footwear needed, crampons may be necessary.
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Gale force, walking arduous
Considerable buffeting, walking into the wind will be strenuous on exposed terrain, stronger gusts may knock you off your feet. 40 to 55mph.
Snow and hail showers
Periods of bright or sunny conditions mixed with showers or flurries of snow and hail. Visibility may change rapidly from excellent to very poor.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Cold
Air temperature below 0C all day on higher mountains. Significant chill factor if exposed to strong winds. Suitable protective clothing required.
Terrain widely frozen
All ground frozen from lower elevations upward, with hard frost or snow cover. Beware of icy surfaces on lower and higher terrain. Appropriate footwear needed, crampons may be necessary.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 13th March 2026
Last updated
Thu 12th Mar 26 at
1:05PM
Summary for all mountain areas
Cold widely gale force upland winds around a deep low north of Scotland, will bring a succession of snow and hail showers to the mountains. Cloud will extensively cover the mountains (the highest cloud base well inland afternoon). Much higher terrain will be below freezing point.
Headline for Eryri / Snowdonia National Park
Upland gales; squally hail and snow showers. Fog.
How windy? (On the summits)
West to southwesterly 45-55mph post dawn. Will tend to ease toward 35-45mph. Very gusty near precipitation.
Effect of the wind on you?
Difficult walking over exposed higher terrain, particularly morning when buffeting considerable and wind chill significant.
How Wet?
Hail and snow showers, risk thunder
Showers with hail, possibly merging into almost constant precipitation over an hour or so. Snow falling to 400m in morning, then above 500-600m. Risk isolated lightning.
Cloud on the hills?
Very extensive on higher areas - cloud base may drop during day
Cloud base varying sometimes quickly: near precipitation shafts of cloud 450m or lower and persistent higher areas. During drier periods cloud base typically 700 to 900m (generally highest east Wales).
Chance of cloud free summits?
20%
Sunshine and air clarity?
Brief bursts of sun, most often east Wales. Visibility varying between intermittently very good, and at least briefly appalling when in snow/hail and cloud.
How Cold? (at 900m)
-2C rising toward 0C afternoon. Will feel as cold as minus 14C directly in the wind.
Freezing Level
500m at first, rising toward 800m trough day.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 14th March 2026
Last updated
Thu 12th Mar 26 at
1:05PM
How windy? (On the summits)
Southwest to westerly, ranging from 25-30 to perhaps for a few hours 35mph.
Effect of the wind on you?
Strenuous walking at times where exposed across higher areas. Considerable wind chill.
How Wet?
Hail and snow showers.
Showers: may be frequent morning, but should gradually ease. Expect hail and above 600m, snow.
Cloud on the hills?
Almost constantly covering higher tops
Varied cloud base: sometimes below 450m near precipitation but periods when most cloud above 600 to 800m (highest near and north of Ogwen valley and easternmost summits).
Chance of cloud free summits?
20%
Sunshine and air clarity?
Glimpses of sun, mainly lower slopes. Hazy, and very poor visibility in snow.
How Cold? (at 900m)
-1C. Will feel as cold as minus 12C directly in the wind.
Freezing Level
850m
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 15th March 2026
Last updated
Thu 12th Mar 26 at
1:05PM
How windy? (On the summits)
Southwest veering west typically between 35 and 45mph, perhaps 60mph morning. Risk strengthening further toward dusk.
Effect of the wind on you?
Continued difficult walking and wind chill significant on exposed higher areas. Expect balance, and in places general mobility to be difficult.
How Wet?
Rain morning; clearing to showers
Morning: Extensive rain. Middle of day: Clearing from west, but the rain finishing as snow above 700m Afternoon: Hail and snow showers (rain lower slopes).
Cloud on the hills?
Hills covered morning; then cloud base rising markedly
Morning: Blanket of fog across the hills, breaks to 700m west Wales. Middle of day: Beginning to improve. Into afternoon: Varying cloud base, between occasionally 500m near precipitation and otherwise 750 to 900m.
Chance of cloud free summits?
Less than 10% morning; later 40%
Sunshine and air clarity?
Dull and misty morning. Then improving to patchy sun (mainly east Wales) and mostly very good visibility (temporarily poor in precipitation).
How Cold? (at 900m)
4C dropping to 0 or -1C. Will feel as cold as minus 12C where exposed to the wind.
Freezing Level
Above the summits morning, then dropping to between 650 and 900m.
Planning Outlook
Further bouts of upland gales over the next few days. Precipitation on most mountains daily, focussed on western hills. Freeze thaw cycles will occur: on the Scottish Highlands, thaw periods fairly brief and snow accumulating on many slopes. Further south, lying snow more intermittent as periods of thaw will be lengthier. Temperature levels will rise from about next Tuesday and as pressure then builds, most or all mountain areas will then become largely fine.