Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Monday'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.
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.
Click an icon for more information or click here for a key to all icons.
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.
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 5th October 2026
Last updated
Sun 4th Oct 26 at
3:52PM
Summary for all mountain areas
Humid air ahead of a cold front moving slowly south across Scotland will bring fog and drizzle to most mountain areas, although some improvement from the north across the Scottish Highlands. Upland gales will be widespread - least windy southwards along the Pennines and also Wales.
Headline for Eryri / Snowdonia National Park
Gales higher areas. Dull; persistent fog. Drizzle, mainly west Wales.
How windy? (On the summits)
Southwesterly increasingly markedly with height to 35 to above about 900m, 45mph. Generally a slow easing through the day.
Effect of the wind on you?
Expect considerable wind chill and walking to be strenuous, sometimes difficult on higher tops. Balance difficult at times higher up.
How Wet?
Patches of drizzle mailnly western slopes.
Occasional drizzle western mountains, mostly widely upslopes north from Lleyn peninsula. Elsewhere isolated if any drizzle.
Cloud on the hills?
Fog most or all higher areas; very low cloud base west Wales
Blanket of low cloud much of Wales, near 200m Lleyn peninsula and slopes immediately north. But otherwise cloud base typically 500-700m, highest north & east of A5
Chance of cloud free summits?
10%
Sunshine and air clarity?
Mostly cloudy or dull and intermittently misty, although a little sun and goo visibility easternmost Wales.
How Cold? (at 900m)
11C.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 6th October 2026
Last updated
Sun 4th Oct 26 at
3:52PM
How windy? (On the summits)
Westerly 20-30mph, before later a drop to 15mph as wind changes toward northerly.
Effect of the wind on you?
Likely to impede ease of walking on higher areas. Marked wind chill.
How Wet?
Rain from time to time, mainly western hills
Rain and drizzle on and off, mostly west Wales. Total rainfall mostly fairly small. May clear from north late in day - timing uncertain.
Cloud on the hills?
Blanket of fog on the hills
Fog across hills above 300 to 450m, lowest more western hills, breaks to 600m east Wales. May temporarily drop below 200m coastal slopes. Could begin to clear from north before sunset.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Widely dull and misty. Possible marked improvement late in day. Visibility often excellent east Wales.
How Cold? (at 900m)
9C; may drop a few degrees late in day Snowdon range.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 7th October 2026
Last updated
Sun 4th Oct 26 at
3:52PM
How windy? (On the summits)
Northwesterly 25-30mph, but perhaps later in day 40mph.
Effect of the wind on you?
Will impact ease of walking and balance difficult at times. Later, conditions may become difficult, particularly near showers. Considerable wind chill.
How Wet?
Hail showers
Confidence low: Overnight rain will clear, possibly only slowly through morning from east Wales. Later risk of showers, perhaps hail.
Cloud on the hills?
Extensive on higher areas
Cloud likely to shroud the mountains widely in rain, but as it clears to showers, so cloud base rises to 750 to 900m, but dropping to 400 to 600m near showers. Generally lowest cloud base will be on Snowdon range.
Chance of cloud free summits?
30%
Sunshine and air clarity?
Patches of sun will extend east - most sun mid Wales. Visibility sometimes poor, but otherwise good, although a haze.
How Cold? (at 900m)
4C; will feel as cold as minus 7C directly in winds.
Freezing Level
Above the summits.
Planning Outlook
A brief colder period with the wind easing on Wednesday and Thursday - some snow will lie on higher Scottish summits. Winds then return to the southwest, bringing bands of rain, low cloud and strong upland winds across Britain. Most frequent severe weather will be on the W and NW Highlands, where there will be considerable rain and frequent upland gales.