Clear Sky Stargazing

Don't drive to a dark site for nothing. Clear Sky Stargazing answers the one question every stargazer asks — "will the sky be clear tonight?" — with a single clarity score, an hour-by-hour breakdown of the night, and the best window to set up your telescope or just lie back and watch.

Tonight's view opens on a clarity dial scored from Poor to Excellent, built from cloud cover, transparency, atmospheric seeing and the moon.

WHAT YOU GET

• Tonight's stargazing score — one clear rating for the night, with the conditions that drive it broken out into cloud, transparency, seeing and moon.
• Best viewing window — the app finds the clearest stretch of dark hours tonight, when it starts and how long it lasts.
• Hour-by-hour tonight — a strip across the dark hours showing the clarity score and low-cloud cover for each hour, so you can pick your moment.
• 5-night outlook — clarity for the dark hours of the next five nights, so you can plan an observing session days ahead.
• Sky conditions in depth — transparency (how faint the stars you'll see), seeing (how steady and crisp), moon interference (a bright moon washes out the Milky Way), astronomical twilight times, and an optics dew-risk read so you know whether to bring a dew heater.

WHO IT'S FOR

Amateur astronomers and telescope owners, astrophotographers, Milky Way and deep-sky observers, meteor and aurora watchers, and anyone who wants to know whether tonight is worth heading out for.

HOW IT WORKS

The clarity forecast is built from Open-Meteo cloud and visibility data plus the moon phase for your location. Enable location for your sky, or browse sample data offline.

A NOTE ON ACCURACY

Cloud, humidity and visibility are forecasts from a global weather model, not a measurement of your sky. Local fog, thin cirrus and light pollution aren't captured. This is a planning aid, not a guarantee — always look up.