Eryri / Snowdonia National Park

Includes all summits in the the northern half of Wales from Pumlumon northwards.

Today's Forecast

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Click here to download the latest PDF Last Updated Wed 27th Mar 24 at 3:21PM
View our detailed version Last Updated Wed 27th Mar 24 at 3:21PM

Viewing Forecast For

Eryri / Snowdonia National Park
Thursday 28th March 2024
Last updated Wed 27th Mar 24 at 3:21PM

Summary for all mountain areas

Within a deep area of low pressure (the main centre near SW Wales) bands of precipitation (snow higher areas) and low cloud will move north across Britain. But frequently dry Scottish Highlands. Upland winds will vary: temporary lulls in some areas between extensive gales or near gales.

Headline for Eryri / Snowdonia National Park

Upland gales or near gales. Rain, sometimes heavy, persistent fog.

How windy? (On the summits)

South to southeasterly, speeds varying through day: often 35 to 40 or perhaps 45mph, but perhaps a temporary lull to 25mph.

Effect of the wind on you?

Frequent arduous or difficult walking conditions on higher exposed terrain. Significant wind chill.

How Wet?

Rain on and off; snow and hail higher areas. Risk lightning.

A dry-wet-dry-wet sequence as bands of rain, mostly falling as heavy, perhaps thundery, clusters of showers. Expect hail and above 500 to 750m, snow: expect whiteout.

Cloud on the hills?

Cloud base varying, but persistent fog nearly all higher summits

Variations in cloud base, sometimes patches below 300 or 400m (lowest eastern hills), but breaks to 650 to occasionally 900m, mainly Snowdon range during the dry periods.

Chance of cloud free summits?

Less than 10%

Sunshine and air clarity?

Rare sunshine. Visibility very varied; poor or appalling in precipitation, but when dry dry good or excellent.

How Cold? (at 900m)

0 or -1C. Wind chill feeling like -14C.

Freezing Level

Varying between 600 and 900m.

Viewing Forecast For

Eryri / Snowdonia National Park
Friday 29th March 2024
Last updated Wed 27th Mar 24 at 3:21PM

How windy? (On the summits)

Southerly, 30 to 40mph.

Effect of the wind on you?

Walking arduous or in places difficult and wind chill significant on exposed higher terrain.

How Wet?

Precipitation on and off; risk thunder

Rain, or above 750m snow, from time to time. Generally a trend toward heavier showery precipitation by afternoon; giving hail and risk thunder.

Cloud on the hills?

Extensive, in places patches on lower slopes

Overall fog very extensive: fragments on lowest slopes, particularly in precipitation. Where dry, cloud base lifting toward 650m; perhaps a few breaks above 850m Snowdon range.

Chance of cloud free summits?

20%

Sunshine and air clarity?

Sunshine coming through from time to time. Visibility good for periods, but abruptly poor in precipitation.

How Cold? (at 900m)

1C; rising marginally during day. Will feel as cold as minus 12C directly in the wind.

Freezing Level

1000m or above.

Viewing Forecast For

Eryri / Snowdonia National Park
Saturday 30th March 2024
Last updated Wed 27th Mar 24 at 3:21PM

How windy? (On the summits)

Southerly, speeds may well vary across Wales and through day: typically 20-30mph east Wales and 25-40mph elsewhere.

Effect of the wind on you?

May well result in considerable buffeting and wind chill for periods, particularly west Wales.

How Wet?

Intermittent showery rain

Morning: A few patches of showery rain (or snow above 650m) heavy in places near west coast. From about midday: Heavier hail showers extending inland and becoming widespread. Risk thunder.

Cloud on the hills?

Extensive at first; mostly lifting to or perhaps above higher summits

Very varied from dawn; some higher slopes cloud free, but many mountains foggy, in places from lower slopes up. Will change through morning as cloud base rises. From late morning, cloud base often above 800 or 900m, but lower in rain, and perhaps near Lleyn peninsula.

Chance of cloud free summits?

Rising to 40% by midday

Sunshine and air clarity?

Bursts of sunshine and often very good visibility. However, visibility abruptly poor in precipitation.

How Cold? (at 900m)

Around 1C after dawn before reaching 2 to 5C mid afternoon; warmest easternmost Wales. Will feel as cold as minus 10C in the wind.

Freezing Level

Just above highest summits.

Planning Outlook

Low pressure will continue to dominate the weather through the Easter weekend and beyond. Nevertheless, through the Easter weekend wind speeds will drop; rain will ease to scattered mainly afternoon showers, and cloud base will rise - many summits clearing at least temporarily in the afternoons. The wind will be slowest to drop on westernmost summits and across Wales, where the showers will also be most prevalent. Toward the middle of next week, further strong wind, rain (snow higher areas, mainly Scotland) and low cloud is likely - although it may remain substantially dry in NW Scotland.