Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Tuesday'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.
Clear
Excellent or superb visibility, no navigation issues.
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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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.
Clear
Excellent or superb visibility, no navigation issues.
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
Tuesday 25th November 2025
Last updated
Mon 24th Nov 25 at
12:15PM
Summary for all mountain areas
Higher areas, mainly Scottish Highlands frozen, and frost some valleys at first. Otherwise, benign as from the west the northerly wind drops and snow and hail showers become isolated.
How windy? (On the summits)
Northerly 25 to temporarily 30mph higher slopes after dawn. Will gradually ease to 15mph.
Effect of the wind on you?
Becoming small - though notable wind chill higher tops at first.
How Wet?
Little or no precipitation
A few passing showers, mainly Snowdon range, of hail or snow above about 600m.
Cloud on the hills?
Varied; some higher tops clearing, others remaining in cloud.
Snowdon range: cloud base typically 600 to 800m, perhaps a little higher afternoon. Elsewhere: cloud will lift off some higher summits, whilst 'hanging' on some higher slopes all day.
Chance of cloud free summits?
20% Snowdon range; 70% elsewhere
Sunshine and air clarity?
Bright sunshine, mainly away from Snowdon range. Very good visibility.
How Cold? (at 900m)
0C
Freezing Level
Around 900m; willy rise slowly through day. Frost some valleys morning.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 26th November 2025
Last updated
Mon 24th Nov 25 at
12:15PM
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?
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
Mon 24th Nov 25 at
12:15PM
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.
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 storm force) and low cloud. Temperatures on higher tops sometimes below freezing point, particularly at the weekend in Scotland, but elsewhere fresh snow transient.