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.
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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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.
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
Monday 24th November 2025
Last updated
Sun 23rd Nov 25 at
1:59PM
Summary for all mountain areas
Turning cold from north and extensively windy behind an area of low pressure centred over SE England. Snow and hail showers will affect N & E Scotland, whilst further south patchy rain (sleet highest summits), but total rainfall small.
Headline for Eryri / Snowdonia National Park
Showers, mainly morning; upland wind close to gale.
How windy? (On the summits)
Northerly, 30 and on higher ridges and tops 40mph.
Effect of the wind on you?
Walking arduous or in places difficult, particularly near precipitation, where in gusty conditions, balance tricky and wind chill significant.
How Wet?
Little or perhaps no precipitation
Intermittent rain overnight will continue into daylight before easing to well scattered patches of showery rain.
Cloud on the hills?
Cloud base rising - probably not clearing higher summits
Morning: cloud shrouding higher areas extensively. Gradually cloud base rising toward 750 to perhaps 900m mid Wales, but patches may persist at or below 600m near and north of the A5.
Chance of cloud free summits?
20% Snowdon range to in afternoon 70% elsewhere
Sunshine and air clarity?
Occasional sunshine, mainly mid Wales. Visibility very good
How Cold? (at 900m)
Around 1C - a marginal drop likely through the day Will feel as cold as minus 8C directly in the wind.
Freezing Level
1050m.
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 25th November 2025
Last updated
Sun 23rd Nov 25 at
1:59PM
How windy? (On the summits)
Northerly 25mph gradually easing to 15mph.
Effect of the wind on you?
Considerable buffeting and wind chill after dawn, but will become small through afternoon.
How Wet?
Little or no precipitation
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; may rise slowly through day. Frost some valleys morning.
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 26th November 2025
Last updated
Sun 23rd Nov 25 at
1:59PM
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). 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 5C. 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.
Planning Outlook
As a series of deep Atlantic lows pass north of or across Britain, rainfall be become high particularly on western mountains together with frequent upland gales and low cloud. In Scotland, temperatures on the Munros will sometimes be below freezing point, but fresh snow transient, whereas elsewhere, snow rare, if any.