ClearSkys tells you whether tonight's sky will be clear enough to stargaze. We analyse cloud cover, moon, wind and humidity for your exact location and score it out of 100, with the best clear-sky window picked out hour by hour.
Check Tonight's Forecast →Free · No sign-up · Works for any location on Earth
A regular weather app tells you if it'll rain. It won't tell you whether the sky will actually be clear enough to see anything or when tonight's clearest window opens. ClearSkys is built for exactly that: it pulls the cloud, moon, wind and humidity data for wherever you are and turns it into one honest answer about whether tonight is good for stargazing.
Check whether the sky is clear tonight, see which planets are visible tonight and tonight's aurora chances, and browse stargazing forecasts by location for the next genuinely clear night worth planning around. It works anywhere in the world.
Six factors decide whether a night is worth it. We weigh them all so you don't have to.
Everything rolls up into a single score. No need to cross-reference three weather apps, a moon calendar, and a cloud chart. Just check your score.
Beyond the go/no-go decision, we tell you what's worth looking at tonight.
Tonight's conditions for 100+ cities, or search any location.
Learn how stargazing conditions work, what to look for, and how to read a forecast.
Enter your location and ClearSkys shows you tonight's cloud cover hour by hour, alongside moon, wind and humidity, rolled into a single clear-sky score from 0 to 100. A high score means clear, settled skies worth getting out for; a low one means stay in. You'll also see the clearest window of the night, so you know exactly when to look up.
Cloud cover is the biggest factor — if you can't see through it, nothing else matters. After that, wind (shakes the scope), humidity (fogs the optics), rain probability, and moon illumination are all weighted into a single 0–100 score. Above 80 is Excellent, 65–79 Good, 45–64 Mixed, below 45 Poor.
ClearSkys calculates which planets are above the horizon during darkness hours at your exact location, showing peak altitude and direction. No more guessing whether Jupiter is up — you'll know exactly where to point.
Yes — free push notifications alert you when tonight's score crosses your threshold at saved locations. Also fires for aurora activity. No app install needed — works straight from your browser.
Yes — enter any location on Earth. Weather data comes from Open-Meteo's global coverage, and all astronomy calculations (sun, moon, planets, satellites, aurora) are computed for your exact coordinates.