Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Dry and sunny
Extensive strong warm sunshine. The mountains free of cloud once any early mist patches disperse.
Hot
Heatwave conditions. Very high temperatures, rising to 20C+ on high tops, approaching 30C in some valleys. Beware of heat stroke and dehydration. Carry plenty of liquid.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Click an icon for more information or click here for a key to all icons.
Light wind, negligible impact
Little wind or walking hardly affected by the wind, but feeling chilly if exposed on tops. 10-15mph or less.
Dry and sunny
Extensive strong warm sunshine. The mountains free of cloud once any early mist patches disperse.
Hot
Heatwave conditions. Very high temperatures, rising to 20C+ on high tops, approaching 30C in some valleys. Beware of heat stroke and dehydration. Carry plenty of liquid.
Strong warm sunshine
High UV levels, feeling very warm when ascending, beware of dehydration and sunburn.
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 12th July 2025
Last updated
Fri 11th Jul 25 at
4:00PM
Summary for all mountain areas
Hot everywhere, rising to 30C in valleys widely by early afternoon, slightly cooler easternmost areas. Unbroken sunshine dawn til dusk. Light winds, though breezier west coast of Scotland, particularly on islands. Very dry ground conditions - high fire risk.
Headline for Eryri / Snowdonia National Park
Hot sunshine. Increasing breeze.
How windy? (On the summits)
Southeasterly 15mph or less. Rising towards easterly 20mph by evening.
Effect of the wind on you?
Small, but feeling breezier later.
How Wet?
No rain
Cloud on the hills?
Cloud not expected
Chance of cloud free summits?
100%
Sunshine and air clarity?
Widespread strong sunshine; beware sunburn, dehydration and heatstroke. Low level haze, but excellent visibility on high ground.
How Cold? (at 900m)
20C at dawn, rising a degree or two. Remaining warm overnight.
Freezing Level
Well above the summits. (Valley temperatures approaching 28 to 30C in the afternoon, hottest east Wales.)
Viewing Forecast For
Eryri / Snowdonia National Park
Sunday 13th July 2025
Last updated
Fri 11th Jul 25 at
4:00PM
How windy? (On the summits)
Southeasterly with some variability, 15-20mph. Breezes occasionally reaching 25mph, notably early in the day.
Effect of the wind on you?
Fairly small, occasional uncomfortable breezes; some buffeting gusts early.
How Wet?
Substantially dry
Few local spots of rain from high cloud later in the day, otherwise dry. Then into night, possibility of thundery rain developing.
Cloud on the hills?
Hills clear
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
A widely sunny morning, patchy cloud building and increasingly blocking sun. Excellent visibility.
How Cold? (at 900m)
17 or 18C, only a slight warming if any.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 14th July 2025
Last updated
Fri 11th Jul 25 at
4:00PM
How windy? (On the summits)
South turning southwesterly, strengthening 25 to 35mph, risk 40mph with stronger gusts afternoon-evening.
Effect of the wind on you?
Increasingly affecting comfortable walking and balance on exposed terrain, buffeting gusts, becoming more challenging.
How Wet?
Thunderstorms likely
Heavy rain, torrential bursts and possible thunderstorms from dawn into morning. May break up and clear north, but risk of further heavy showers and scattered thunderstorms during afternoon.
Cloud on the hills?
Low cloud in morning, breaks forming
Fairly extensive across the hills in rain, cloud banks from forest canopies up. With time, cloud tending to lift and break, may clear tops at times afternoon.
Chance of cloud free summits?
20% rising to 60% afternoon.
Sunshine and air clarity?
Overcast in rain, hazy or murky for a time. Improving visibility with some sun breaking through for periods.
How Cold? (at 900m)
10C, fairly humid start, dropping slightly to a much fresher 8C later in day.
Freezing Level
Above the summits
Planning Outlook
Lowering pressure from southwest late Sunday into Monday bringing increasing risk bursts of rain and thunderstorms to start the new week, strong and gusty southerly winds. Temperatures will cool towards average. Pressure goes slack and winds fall light into midweek. A risk of heavy rain moving across England and Wales in particular on Tuesday. Low pressure is likely to be more common in the extended outlook with slow-moving areas of showery rain, some thundery bursts locally, interspersed with drier days.