Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
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Severe gale or storm, mobility very difficult
Severe conditions on the mountains, any movement very challenging, you may be blown over. 55-70mph+
Frequent or persistent rain
Steady rain fairly persistent, occasionally heavy, rather wet underfoot.
Poor visibility
Murky conditions with areas of fog shrouding the hills, making navigation challenging. Map and compass essential.
Cool to mild
Air temperature 5 to 10C on higher terrain. Comfortable temperatures on lower terrain, but feeling chilly if exposed to wind higher up, especially if stationary. Pack extra layers.
Viewing Forecast For
Eryri / Snowdonia National Park
Monday 15th September 2025
Last updated
Sun 14th Sep 25 at
4:15PM
Summary for all mountain areas
Rain likely persistent for the northern Highlands, at times heavy. Showery rain elsewhere over Scotland, may cluster locally into areas of more frequent rain. Wind variable for Highlands, but likely increasing. Westerly gales over hills in England, severe on tops in Wales, and raining most of the day.
Headline for Eryri / Snowdonia National Park
Gales, storm-force on tops. Near-constant rain.
How windy? (On the summits)
West to southwesterly 55 to 70mph, at times 80mph over higher mountains with stronger gusts.
Effect of the wind on you?
Very difficult conditions all day, with significant wind chill and buffeting from mid-elevations upward. Any mobility often challenging higher up, gusts knocking you off your feet.
How Wet?
Often raining all day, heavy bursts
Frequent showery rain, merging into near-constant rainfall on western hills, often heavy. Showers passing eastwards across all areas. Wet underfoot with fast-flowing streams.
Cloud on the hills?
Fairly extensive higher areas
Varying bases, but often around 600-800m, covering the the hills in cloud. Occasionally patches below 500m in west.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Little or no sun, glimpses mostly in the east. Visibility often poor due to rain.
How Cold? (at 900m)
7C. Feeling like -5 to -8C directly in the wind.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Tuesday 16th September 2025
Last updated
Sun 14th Sep 25 at
4:15PM
How windy? (On the summits)
Westerly 40 to 50mph at first, strongest over the tops, easing down into the afternoon to 25mph.
Effect of the wind on you?
Arduous conditions through morning, perhaps difficult for a time, significant wind chill. Easing into the afternoon.
How Wet?
Scattered showers
A scattering of showers coming and going for several hours, tending to ease off for a drier afternoon. More rain arriving evening into night from the southwest.
Cloud on the hills?
Frequent on upper slopes, lifting to tops.
Frequent cloud covering upper slopes of the hills from dawn. Gradual rise of the bases to tops, where there will be intermittent clearing in the afternoon.
Chance of cloud free summits?
20% lifting to 60%
Sunshine and air clarity?
A little hazy patches of sun, through an increasing veil of high cloud. Becoming overcast. Visibility good or very good.
How Cold? (at 900m)
7C. Feeling below freezing in the wind, near -5C high tops.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Wednesday 17th September 2025
Last updated
Sun 14th Sep 25 at
4:15PM
How windy? (On the summits)
Uncertainty as a complex weather system approaches: Southwesterly likely 30-40mph, but risk persistently 50mph+.
Effect of the wind on you?
Challenging conditions likely, possibly difficult walking much of the day over higher terrain.
How Wet?
Rain and drizzle, may fade
Rain and drizzle likely fairly persistent, possibly steady or heavier rain for a few hours. Chance of constant rain continuing, but may tend to fade with time.
Cloud on the hills?
Fairly extensive
Cloud likely to cover higher slopes most or all day, at times blanketing hills to mid-slopes during rain. Chance of lifting a little.
Chance of cloud free summits?
20%
Sunshine and air clarity?
Generally overcast, varied layers of cloud. Visibility reduced by rain, at times poor; some possible improvement if rain eases.
How Cold? (at 900m)
8 to 10C. Feeling sub-zero in the wind, nearer -5C in stronger speeds.
Freezing Level
Above the summits
Planning Outlook
An ongoing unsettled outlook generally dominated by low pressure. Uncertainty about the track of a developing low into midweek, a risk of further extensive rain and gales, though the worst of these conditions may be confined to England and Wales. Areas of rain and showers frequently in the forecast later in the week. Temperatures near-average, but feeling cool when exposed to wind. A chillier northwesterly may emerge by next weekend, briefly dropping near freezing on highest Scottish tops. Indications then favour higher pressure at least briefly expanding northwards early next week for some drier days, but unlikely to settle down for long.