Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday's Forecast
Windy, walking impeded
Blustery conditions enough to give buffeting on higher terrain or affect balance on exposed ridges. 25 to 40mph.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
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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.
Patchy rain or drizzle
Rain on and off, or generally drizzly - total amounts small, but may be persistently damp, especially where hills are shrouded in cloud.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Warm
Comfortable temperatures on the hills, 10 to 15C on tops, feeling pleasantly warm especially on lower ground. Beware of feeling cooler if exposed to wind on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 12th October 2026
Last updated
Sun 11th Oct 26 at
4:00PM
Summary for all mountain areas
Extensive low cloud blankets the mountains, poor visibility widely; generally damp with drizzle and some steadier rain. Best chance for drier conditions and local higher cloud breaks to the north of major hill groups. Wind speeds will vary, but often blustery around tops. Fairly mild southerly air.
Headline for Eryri / Snowdonia National Park
Murky and damp, locally better north; wind strengthening.
How windy? (On the summits)
Southerly 20 to 30mph, slightly lower speeds for a time into middle of day, then through afternoon tending to increase, to southwesterly 40mph before sunset, then 50mph onward into night.
Effect of the wind on you?
Fairly small on some slopes, but blustery around higher exposed terrain. Tending to deteriorate to more challenging conditions on higher mountains later in day.
How Wet?
Generally damp, some steady rain
Rain and drizzle most persistent over west coastal hills and Llyn peninsula, some steady or heavier rain more widely in the morning. Patchier smaller amounts toward north and east, sometimes easing off afternoon. Rain and drizzle likely returns steadier evening into night.
Cloud on the hills?
Extensive, local breaks north
Shrouding most hills all day, from lower elevations toward west coast, rarely above 400-500m inland. Higher bases north from Ogwen valley, occasional breaks above 600m. Some breaks possible more widely afternoon, but rare near to west coast. Highest tops may emerge near top of a cloud layer.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Overcast, dull or murky. Local brighter moments north and during afternoon.
How Cold? (at 900m)
10 to 12C, locally warmer in north if out of cloud; rising slightly warmer into night. Increasingly humid. Feeling near to freezing if in stronger wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 13th October 2026
Last updated
Sun 11th Oct 26 at
4:00PM
How windy? (On the summits)
West-southwesterly, overnight gales ease, only a brief drop to 25mph, but mostly in the range 30 to 40mph.
Effect of the wind on you?
Generally blustery over the mountains, more challenging at times on exposed high terrain; increasingly marked wind chill.
How Wet?
Early rain then showers
Heavy rain around dawn clears away eastwards in morning, leaving a brief drier window, but showers soon follow from the west, frequent for a time near west coast, but these later tend to ease.
Cloud on the hills?
Often capping high western tops
Varied cloud banks from dawn, but lifting toward upper slopes and clearing some high tops for a time inland, but patches often cap higher tops in Snowdon group and near coast, lowering again in showers.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Some sun breaking through occasionally in morning, often cloudy west. Visibility good as rain clears, but some haze in west, reduced further in showers.
How Cold? (at 900m)
Mild 12C overnight but dropping to 8C by dawn, lowering further during day to 6C. Feeling later like -6C in stronger wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 14th October 2026
Last updated
Sun 11th Oct 26 at
4:00PM
How windy? (On the summits)
Southwesterly, in range 40 to 60mph, notable increase with height; sustained speeds strongest in afternoon.
Effect of the wind on you?
Strenuous walking even on lower hills, gusts knocking you off balance, increasingly difficult on high terrain.
How Wet?
A little rain west
Spots of rain in the wind, frequently damp around cloud over west coastal hills, drier further east and northeast.
Cloud on the hills?
Most persistent west coast hills
Banks of cloud clinging to western hills much of day above 600-700m, lowest near west coast. Near/north from Ogwen valley, the cloud base higher, often above 800m with breaks. Also clearer east Wales.
Chance of cloud free summits?
20% west, 40% north, 60% east.
Sunshine and air clarity?
Glimpses of weak sun mostly north and eastern areas. Hazy, visibility better further east.
How Cold? (at 900m)
6C rising to 8C. Feeling like -5C directly in the wind.
Freezing Level
Above the summits.
Planning Outlook
A very unsettled Atlantic pattern this week. Southwesterly gales strengthen to become severe on the mountains into Wednesday, moderating into Thursday. Frequently raining particularly over western hills, some bands of more extensive heavier rain passing eastwards through midweek. Milder early in the week, then cooler later, with showery conditions by Thursday into Friday on westerly winds - Scottish high summits may drop back close to freezing with some snow falling on higher tops. Indications start to favour higher pressure building into next weekend and early next week for a period of quieter weather and scope for inversion conditions on high terrain.