UK Dark Sky & Astrophotography Forecast

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Snowdon - Yr Wyddfa

Forecast at the named peak, not a recommendation to climb it at night. Lower viewpoints can have different cloud and horizons.

Night beginning Friday 13 November 2026. Times are UK local time.

Viewing conditions

Best available dark spell: 13 Nov, 19:00 GMT to 20:00 GMT.

Mixed sky conditions

Forecasts disagree about rain or haze, so it could be murkier than this looks.

Forecast models disagree about this spell.

There is a darker spell with the moon down: the best time for faint stars and meteors.

Crescent moon, about 20% illuminated.

Full darkness: 13 Nov, 18:25 GMT to 14 Nov, 05:35 GMT.

Moon-free darkness: 13 Nov, 18:40 GMT to 14 Nov, 05:35 GMT.

Moonset around 13 Nov, 18:40 GMT.

Compare conditions through the night

Sky weather during fully dark periods
Time	Conditions
13 Nov, 18:25 GMT to 19:00 GMT	Mixed sky conditions Some breaks in the cloud, so stars at times.
13 Nov, 19:00 GMT to 20:00 GMT	Mixed sky conditions Forecasts disagree about rain or haze, so it could be murkier than this looks. Forecast models disagree.
13 Nov, 20:00 GMT to 21:00 GMT	Mixed sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
13 Nov, 21:00 GMT to 22:00 GMT	Mixed sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
13 Nov, 22:00 GMT to 23:00 GMT	Mixed sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
13 Nov, 23:00 GMT to 14 Nov, 00:00 GMT	Mixed sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
14 Nov, 00:00 GMT to 01:00 GMT	Mixed sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
14 Nov, 01:00 GMT to 02:00 GMT	Poor sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
14 Nov, 02:00 GMT to 03:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.
14 Nov, 03:00 GMT to 04:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.
14 Nov, 04:00 GMT to 05:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.
14 Nov, 05:00 GMT to 05:35 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.

Sky weather during fully dark periods
Time	Conditions
10 Nov, 18:30 GMT to 19:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.
10 Nov, 19:00 GMT to 20:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.
10 Nov, 20:00 GMT to 21:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars.
10 Nov, 21:00 GMT to 22:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
10 Nov, 22:00 GMT to 23:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
10 Nov, 23:00 GMT to 11 Nov, 00:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
11 Nov, 00:00 GMT to 01:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times.
11 Nov, 01:00 GMT to 02:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times.
11 Nov, 02:00 GMT to 03:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times.
11 Nov, 03:00 GMT to 04:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
11 Nov, 04:00 GMT to 05:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
11 Nov, 05:00 GMT to 05:30 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times.

Sky weather during fully dark periods
Time	Conditions
11 Nov, 18:30 GMT to 19:00 GMT	Mixed sky conditions Mostly cloudy, so little chance of seeing the stars.
11 Nov, 19:00 GMT to 20:00 GMT	Good sky conditions Some breaks in the cloud, so stars at times.
11 Nov, 20:00 GMT to 21:00 GMT	Good sky conditions Some breaks in the cloud, so stars at times.
11 Nov, 21:00 GMT to 22:00 GMT	Good sky conditions Mostly clear.
11 Nov, 22:00 GMT to 23:00 GMT	Poor sky conditions Some breaks in the cloud, so stars at times. Hazy, which dims the fainter stars.
11 Nov, 23:00 GMT to 12 Nov, 00:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.
12 Nov, 00:00 GMT to 01:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.
12 Nov, 01:00 GMT to 02:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.
12 Nov, 02:00 GMT to 03:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars.
12 Nov, 03:00 GMT to 04:00 GMT	Good sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
12 Nov, 04:00 GMT to 05:00 GMT	Good sky conditions Some breaks in the cloud, so stars at times.
12 Nov, 05:00 GMT to 05:35 GMT	Poor sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.

Sky weather during fully dark periods
Time	Conditions
12 Nov, 18:25 GMT to 19:00 GMT	Mixed sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
12 Nov, 19:00 GMT to 20:00 GMT	Mixed sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
12 Nov, 20:00 GMT to 21:00 GMT	Good sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
12 Nov, 21:00 GMT to 22:00 GMT	Good sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
12 Nov, 22:00 GMT to 23:00 GMT	Good sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
12 Nov, 23:00 GMT to 13 Nov, 00:00 GMT	Mixed sky conditions Mostly cloudy, so little chance of seeing the stars.
13 Nov, 00:00 GMT to 01:00 GMT	Mixed sky conditions Mostly cloudy, so little chance of seeing the stars.
13 Nov, 01:00 GMT to 02:00 GMT	Mixed sky conditions Mostly cloudy, so little chance of seeing the stars.
13 Nov, 02:00 GMT to 03:00 GMT	Good sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
13 Nov, 03:00 GMT to 04:00 GMT	Good sky conditions Some forecasts show clear spells, others keep it cloudy; check again nearer the time. Forecast models disagree.
13 Nov, 04:00 GMT to 05:00 GMT	Very good sky conditions Some breaks in the cloud, so stars at times.
13 Nov, 05:00 GMT to 05:35 GMT	Very good sky conditions Mostly clear.

Sky weather during fully dark periods
Time	Conditions
14 Nov, 18:25 GMT to 19:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
14 Nov, 19:00 GMT to 20:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
14 Nov, 20:00 GMT to 21:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
14 Nov, 21:00 GMT to 22:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars.
14 Nov, 22:00 GMT to 23:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.
14 Nov, 23:00 GMT to 15 Nov, 00:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Hazy, which dims the fainter stars.
15 Nov, 00:00 GMT to 01:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
15 Nov, 01:00 GMT to 02:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
15 Nov, 02:00 GMT to 03:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
15 Nov, 03:00 GMT to 04:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
15 Nov, 04:00 GMT to 05:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
15 Nov, 05:00 GMT to 05:40 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.

Sky weather during fully dark periods
Time	Conditions
15 Nov, 18:25 GMT to 19:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
15 Nov, 19:00 GMT to 20:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
15 Nov, 20:00 GMT to 21:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
15 Nov, 21:00 GMT to 22:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
15 Nov, 22:00 GMT to 23:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
15 Nov, 23:00 GMT to 16 Nov, 00:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars.
16 Nov, 00:00 GMT to 01:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Limited model coverage.
16 Nov, 01:00 GMT to 02:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Limited model coverage.
16 Nov, 02:00 GMT to 03:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Limited model coverage.
16 Nov, 03:00 GMT to 04:00 GMT	Mixed sky conditions Mostly cloudy, so little chance of seeing the stars. Limited model coverage.
16 Nov, 04:00 GMT to 05:00 GMT	Mixed sky conditions Some breaks in the cloud, so stars at times. Limited model coverage.
16 Nov, 05:00 GMT to 05:40 GMT	Good sky conditions Some breaks in the cloud, so stars at times. Limited model coverage.

Sky weather during fully dark periods
Time	Conditions
16 Nov, 18:20 GMT to 19:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Limited model coverage.
16 Nov, 19:00 GMT to 20:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Limited model coverage.
16 Nov, 20:00 GMT to 21:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Limited model coverage.
16 Nov, 21:00 GMT to 22:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Limited model coverage.
16 Nov, 22:00 GMT to 23:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Limited model coverage.
16 Nov, 23:00 GMT to 17 Nov, 00:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars. Limited model coverage.
17 Nov, 00:00 GMT to 01:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars. Limited model coverage.
17 Nov, 01:00 GMT to 02:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars. Limited model coverage.
17 Nov, 02:00 GMT to 03:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars. Limited model coverage.
17 Nov, 03:00 GMT to 04:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars. Limited model coverage.
17 Nov, 04:00 GMT to 05:00 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars. Limited model coverage.
17 Nov, 05:00 GMT to 05:40 GMT	Poor sky conditions Mostly cloudy, so little chance of seeing the stars. Rain at times. Hazy, which dims the fainter stars. Limited model coverage.

Updated 10 Nov 2026, 01:11 GMT. Only available forecast nights are shown.

Check the full mountain weather for Snowdon - Yr Wyddfa

Dark surroundings and the terrain

Estimated darkness rank 804 of 980 assessed peaks (1 is darkest), based on surrounding artificial light in 2021. This is not a measurement of tonight’s sky.

2021 artificial-light baseline, not measured sky brightness or a Bortle class. Changes to lighting, blue-rich LEDs, terrain screening, atmospheric scattering and cloud-reflected light are not resolved. Similar ranks are not meaningfully distinct. Darkness is not a recommendation to climb a summit at night.

VIIRS nighttime lights: Earth Observation Group, Payne Institute for Public Policy, Colorado School of Mines. Reprocessed by OpenGeoHub/OpenLandMap. Cropped and ranked by Mountain Weather.

The terrain horizon has not been checked at this exact location. Nearby slopes or a lower campsite can have a very different view.

Will it be a good night for astrophotography?

Compare the sky-weather summary, moonlight and fully dark periods for your chosen location. A moon-free window is not necessarily cloud-free, and the best available spell can still be poor.

The sky-weather grade is not a measurement of astronomical seeing or a guarantee of sharp images. Artificial-light estimates and terrain context are separate where available. Check the mountain forecast for wind, rain and temperature before choosing a viewpoint.

Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.