Eryri / Snowdonia National Park
Includes all summits in the the northern half of Wales from Pumlumon northwards.
Today's Forecast
Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
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.
Bright sunshine
Beware of sunburn from bright spring sunshine, despite feeling cool in the breeze on higher terrain.
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Moderate breeze, locally gusty
A noticeable breeze, feeling cool where exposed on tops. Locally may be gusty, but unlikely to affect walking progress. 15-25mph.
Patchwork of cloud and sun
Dry most or all day. A mix of cloud and sunshine. Occasional cloud banks drifting over higher slopes, lifting above the tops.
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.
Bright sunshine
Beware of sunburn from bright spring sunshine, despite feeling cool in the breeze on higher terrain.
Viewing Forecast For
Eryri / Snowdonia National Park
Thursday 22nd May 2025
Last updated
Thu 22nd May 25 at
7:13AM
Summary for all mountain areas
Rather cool northerly air, near freezing on high tops in N/NE Scotland all day; marked chill factor higher Cairngorms with a brisk breeze. Generally dry with good amounts of sunshine and very clear air. Early cloud and a little rain Pennine areas. Locally a shower forming in mid & south Wales.
Headline for Eryri / Snowdonia National Park
Cool, moderate breezes. Largely dry, cloud and sun.
How windy? (On the summits)
At dawn, northwesterly 20-25mph. Shifting north-northeasterly and easing a little to 15-20mph; strongest toward west coast.
Effect of the wind on you?
Fairly small, some walking impeded at dawn, perhaps some brief stability effects on exposed western ridges.
How Wet?
Rare light showers
Risk of an odd spot of rain during morning mainly north/east, or brief shower in afternoon, greatest chance mid-Wales.
Cloud on the hills?
Covering tops for a time, clearing afternoon
Banks of cloud drift over highest tops in the morning, risk more persistent northern tops for a time in the morning above 800-900m. Largely lifting and breaking up into afternoon, locally occasional patches high tops.
Chance of cloud free summits?
40% morning, rising to 90% afternoon
Sunshine and air clarity?
A patchwork of sunshine, some extended cloudy periods late morning into early afternoon, especially toward north/east. Excellent visibility.
How Cold? (at 900m)
6 or 7C, little change if any. Feeling near-freezing in the breeze.
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Friday 23rd May 2025
Last updated
Thu 22nd May 25 at
7:13AM
How windy? (On the summits)
West to northwesterly 15-20mph.
Effect of the wind on you?
Fairly small
How Wet?
Dry daylight, chance rain west by dusk
Dry during the day. Rain arriving from the west from dusk into the night.
Cloud on the hills?
Little cloud expected
Passing caps over highest tops in the morning lift and break for largely cloud free hills.
Chance of cloud free summits?
Above 90%
Sunshine and air clarity?
Mostly sunny, fair weather cloud building. High cloud arrives west, thickens towards evening. Excellent or superb visibility.
How Cold? (at 900m)
5C rising to 8C
Freezing Level
Above the summits
Viewing Forecast For
Eryri / Snowdonia National Park
Saturday 24th May 2025
Last updated
Thu 22nd May 25 at
7:13AM
How windy? (On the summits)
West turning southwesterly, 30 to 40mph, risk strengthening further later in day, possibly 50-60mph+ evening into night.
Effect of the wind on you?
Considerable buffeting across higher terrain, balance challenging on exposed ridges. May deteriorate further later.
How Wet?
Drizzly rain fairly persistent
Generally feeling very damp all day in cloud, some periods of heavier drizzle, may become steadier rain occasionally; driest toward eastern areas. Risk heavier rain developing evening into the night.
Cloud on the hills?
Extensive, very low cloud west
Blanket cloud from lower slopes up most or all day toward the coasts, 400-500m fairly widely inland, some higher breaks 600-700m toward Carneddau and Berwyn.
Chance of cloud free summits?
10%
Sunshine and air clarity?
Rare if any glimpses of sun mainly further east/northeast. Generally overcast and dull, poor visibility across the mountains.
How Cold? (at 900m)
9C, little change all day. Feeling sub-zero directly in the wind.
Freezing Level
Above the summits
Planning Outlook
A big change of weather pattern by the weekend as low pressure moves in from the Atlantic and southwesterly winds then prevail. By Friday evening-night, rain moves eastwards across all areas, amounts smaller toward the south Pennines and Wales. Blustery winds, low cloud, damp conditions for Saturday, then widely heavier rain is expected by Saturday night, accompanied by winds strengthening to gale force over many hills. Remaining very windy through Sunday and Monday with mountain gales; cooler too, with heavy showers, particularly frequent in western Scotland, a risk of hail and thunder. A changeable week ahead, some improvement likely later in the week.