Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Wednesday'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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
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.
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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.
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
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.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 26th November 2025
Last updated
Tue 25th Nov 25 at
3:06PM
Summary for all mountain areas
Scotland: Southerly gales with hill fog extend east to become very extensive with rain and drizzle; transient snow upper slopes. England and Wales: Strengthening southerly winds with hills filling in with low cloud with patchy rain and drizzle.
Headline for Eryri / Snowdonia National Park
Strong winds with hills filling in with fog, with frequent rain and drizzle moving in.
How windy? (On the summits)
Southwesterly soon 45 to 55mph. May ease a little afternoon.
Effect of the wind on you?
Extensively difficult walking where exposed with sudden powerful gusts and significant wind chill.
How Wet?
Rain and drizzle on and off
Rain and drizzle gradually spreading inland (briefly snow highest summits) during the morning. The rain frequent western mountains, particularly Snowdon area, but total fall small elsewhere.
Cloud on the hills?
Hills filling in with fog; lowest base west
Some higher slopes may initially be cloud free. Will soon deteriorate, across western hills, cloud widely below 300-450m (lowest Lleyn peninsula to Snowdon area). Elsewhere, slowly filling in across higher slopes, typically 500 to 700m afternoon.
Chance of cloud free summits?
Dropping to less than 10%
Sunshine and air clarity?
Glimpses of weak sunshine lower slopes east Wales and near and north of A5. Otherwise soon extensively dull and particularly west Wales misty.
How Cold? (at 900m)
1C rising to 6C through dayligth. Will feel as cold as minus 12C directly in the wind.
Freezing Level
Locally 900m at first; rising above the summits, probably during morning. Frost valleys, mainly east Wales at dawn.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 27th November 2025
Last updated
Tue 25th Nov 25 at
3:06PM
How windy? (On the summits)
South to southwesterly, strengthening through morning and quickly with height to 55mph where exposed on higher tops.
Effect of the wind on you?
Severe wind chill and walking difficult. Where exposed on higher areas, general mobility becoming a struggle.
How Wet?
Frequent rain and drizzle
Rain and drizzle most of the day particularly Lleyn peninsula to Snowdon Least wet east Wales where often dry.
Cloud on the hills?
Mountains persistently foggy.
Persistent cloud from 200 to 450m western mountains Lleyn peninsula to Snowdon. Elsewhere, cloud base 400 to 650m - although occasionally a little higher.
Chance of cloud free summits?
Less than 10%
Sunshine and air clarity?
Rare glimpses of weak sun lower slopes east Wales and near/north of A5. Visibility widely poor, hazy at best.
How Cold? (at 900m)
7C. Will feel as cold as minus 8C directly in the wind.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 28th November 2025
Last updated
Tue 25th Nov 25 at
3:06PM
How windy? (On the summits)
Southwesterly 35 to 45mph
Effect of the wind on you?
Be prepared for arduous conditions with significant wind chill and buffeting. Particularly gusty as showers move in.
How Wet?
Showers, frequent for periods.
Frequent showers, snow tops. Concentrated into band that will move through at some point, associated with trough, risk thunder. Timing uncertainties.
Cloud on the hills?
Often covering the tops.
Bases varying, but will often descend onto the tops, and may well be extensive for several hours, particularly as showers move through.
Chance of cloud free summits?
30%
Sunshine and air clarity?
A little sun coming through in west, but occasional in the east. Visibility sometimes poor due to rain.
How Cold? (at 900m)
1C
Freezing Level
Around 1000m
Planning Outlook
A long series of Atlantic lows passing north of or across Britain will bring high rainfall to western mountains together with frequent upland gales (sometimes stormy) and low cloud. Temperatures on higher tops sometimes below freezing point, particularly at the weekend in Scotland, but elsewhere fresh snow transient.