Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Friday'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.
Hazy, some fog banks
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Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
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.
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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.
Hazy, some fog banks
Distant views reduced by haze, locally foggy for a time in valleys and some hill slopes.
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
Friday 19th June 2026
Last updated
Thu 18th Jun 26 at
4:25PM
Summary for all mountain areas
A swathe of heavy rain extends across the Highlands, southern Scotland then into Cumbria and west Wales, some torrential bursts, thunder and lightning possible. A belt of gale-force upland winds just ahead of the rain. Warm and humid. Winds ease in western Scotland, rain fades, cloud lifts, dropping cooler.
Headline for Eryri / Snowdonia National Park
Gales, very gusty. Low cloud. Heavy thundery rain later.
How windy? (On the summits)
South-southwesterly, 40 to 50mph, some fluctuations throughout the day, peak gusts vary, 60mph for periods around high tops. Lessening into evening.
Effect of the wind on you?
Challenging walking, gusts knocking you off balance, including on some downslopes to north. Considerable wind chill on tops despite warm air.
How Wet?
Thundery bursts developing later west
Pulses of rain develop in west, occasionally moving inland, but mostly spots from high cloud until later. Substantially dry for much of day eastern areas. Increasing risk later afternoon into evening of heavy bursts of rain developing from west, risk torrential thunderstorms.
Cloud on the hills?
Varied, most persistent west coast
Covering many hills from dawn, to lower slopes near Cardigan Bay, here likely to persist. Some rise of base inland and north, some breaks. Filling in and lowering in rain widely, ragged low patches.
Chance of cloud free summits?
20% west, 50% north/east.
Sunshine and air clarity?
Any sun weak through high cloud, mostly north & east; largely overcast west. Visibility may be good for a time inland, but a haze, then murkier around rain.
How Cold? (at 900m)
Humid 12 to 14C, tending to drop later in day, into night to 8C. Feeling near freezing in wind all day.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 20th June 2026
Last updated
Thu 18th Jun 26 at
4:25PM
How windy? (On the summits)
Southwesterly 15-20mph early in day, possibly 25mph around dawn; dropping variable 10mph or less.
Effect of the wind on you?
Mostly small.
How Wet?
Early light showers fade
Drizzly showers mostly west coastal hills early in day, fading to become dry.
Cloud on the hills?
Low cloud in west clearing
Cloud banks on western hills in morning, to some lower slopes toward coast. Bases rising, tending to thin and break, but patches still likely to cap tops in Snowdon group into afternoon, increasingly clearing.
Chance of cloud free summits?
20% rising to 80% afternoon
Sunshine and air clarity?
Misty and largely cloudy start, improving with some sun breaking through and visibility becoming very good below cloud.
How Cold? (at 900m)
8C rising to 10C afternoon. Feeling near to 0C in wind on higher tops early morning.
Freezing Level
Above the summits.
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 21st June 2026
Last updated
Thu 18th Jun 26 at
4:25PM
How windy? (On the summits)
East to southeasterly or variable, often 10mph or less, occasional gusts 15-20mph may develop.
Effect of the wind on you?
Small.
How Wet?
Rain unlikely
Chance of odd spots from thickening high cloud, possibly a very remote brief burst of rain mainly in afternoon.
Cloud on the hills?
Hills clear
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
A mix of sun and some high cloud, which may cover the sky for periods. Visibility very good.
How Cold? (at 900m)
12C at dawn, rising to 16C afternoon.
Freezing Level
Above the summits.
Planning Outlook
Cooler and less humid for Saturday, some showery rain and low cloud in the west, tending to improve. Sunday is a dry day for most with clearer hills, light winds and feeling warmer, becoming more humid again from the south. More uncertainty early next week - some rain possible for Scotland into Monday, potential scattered thunderstorms for England and Wales as it becomes very humid. A fresher westerly wind is indicated into Tuesday with some showers, then higher pressure likely expands over the country from the south midweek with drier weather then likely for a few days. Scope for higher temperatures and humidity to build toward next weekend, which may eventually break into thunderstorms.