Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
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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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.
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
Monday 28th September 2026
Last updated
Sun 27th Sep 26 at
4:30PM
Summary for all mountain areas
Breezy over Scottish mountains, windier further northwest, feeling chilly. Showery for western Lochaber, Mull and around Skye, tending to fade during afternoon. Largely dry elsewhere, varied cloud over hills in morning, lifting and breaking above many tops with some sunshine. Lighter winds for England & Wales.
Headline for Eryri / Snowdonia National Park
Light wind until later. Patchy cloud clears hills, sunshine.
How windy? (On the summits)
Southwesterly 10 to 15mph, turning southerly 10mph or less, for much of the daytime, then later southeasterly, rising into evening to 15-20mph, strengthening into night to gusty 30mph.
Effect of the wind on you?
Mostly small during daytime.
How Wet?
Rain unlikely
Small chance a very brief light shower near to the west coast in the morning.
Cloud on the hills?
Local patches lift and clear
Some patchy cloud in the morning mainly on south-facing slopes near to coasts, plus local mist in some valleys around dawn inland. All lifting and dispersing for clear hills.
Chance of cloud free summits?
70% west early in day, rising above 90%.
Sunshine and air clarity?
Patchwork of cloud and sun; some early cloud in west, becoming sunnier near coast with time. Visibility excellent.
How Cold? (at 900m)
6C rising to 9C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 29th September 2026
Last updated
Sun 27th Sep 26 at
4:30PM
How windy? (On the summits)
Southeasterly 40 to 60mph, turbulent gusts around high tops, passes and downslope.
Effect of the wind on you?
Challenging walking conditions on exposed terrain, but sudden buffeting also to some lower elevations.
How Wet?
Some drizzle, rain on and off
Spots of rain from time to time, drizzly where in cloud; some pulses of rain spreading from the south, may become more constant falls on hills toward and west of Porthmadog.
Cloud on the hills?
Most persistent eastern hills
Banks of cloud most persistent over east and mid Wales, may cling around tops much of the day. Higher and more broken cloud north and northwestern areas. May tend to thin and disperse during day.
Chance of cloud free summits?
40%
Sunshine and air clarity?
Some glimpses of weak sun through high cloud mostly northwest coastal areas. Hazy.
How Cold? (at 900m)
12 to 14C, feeling humid; then only slight drop onward into night.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 30th September 2026
Last updated
Sun 27th Sep 26 at
4:30PM
How windy? (On the summits)
Southerly 30 to 40mph, at times 50mph over higher mountains particularly toward the west.
Effect of the wind on you?
Strenuous walking conditions, more challenging in places on exposed high terrain with frequent buffeting.
How Wet?
Frequent bursts of rain west
A band of heavy rain from dawn soon clears northeastward, but clusters of heavy showers follow, merging to frequent rain west coastal areas, risk of thunder.
Cloud on the hills?
Often capping tops, breaks north/east
Cloud base lifting early morning with some breaks to upper slopes, but will often cap west coastal tops and vary in height all day; best breaks Carneddau to Bala area.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Intermittent sun breaking through mostly northern areas. Visibility varying, at times very good, but hazier coasts and reducing in rain.
How Cold? (at 900m)
Humid 13C or above from dawn, dropping during the day to a fresher 9C. Feeling near/below freezing in the wind.
Freezing Level
Above the summits.
Planning Outlook
Strong southeasterly winds by Tuesday, widely gales on mountains with turbulent downslope gusts toward the west; some rain developing from the south during the day, becoming heavy later - a band of rain moves northeast into early Wednesday, leaving blustery south-southwesterlies into Wednesday and Thursday, showery in the west. Some occasional rain further ahead, but more often looking drier as higher pressure tends to expand further north during early October. Mostly mild temperatures, some cooler nights develop.