Clear Sky Stargazing
Cloud Forecast for Astronomy
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Will the sky be clear tonight? Get a stargazing score, the best viewing window, and a 5-night forecast before you pack the telescope.
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.
Ratings & Reviews
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Thanks for using our app! This update brings behind-the-scenes performance and stability improvements for a smoother, more reliable experience. Your support means the world to us.
The developer, heekyung moon, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- heekyung moon
- Size
- 55 MB
- Category
- Weather
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- Contains
Advertising
- Copyright
- © 2026 Moon