Will tonight be worth going out?
Stargaze Tonight answers that in 30 seconds — then tells you what to look at if the answer is yes.
Free with ads. No subscription, no locked features. Requires iPhone with iOS 17 or later.
What it does
A verdict, not a dashboard
Good, Fair or Poor with three reasons: cloud cover, moon brightness, and the best time window. No jargon, no raw indices.
Hour-by-hour, not just “cloudy”
A colour strip from sunset to dawn. “It is overcast now but clears at 11pm” is the decision most apps cannot show you.
Compare your observing sites
Save up to five spots and see tonight side by side. Home may be clouded in while a site 40 minutes away is clear.
Works with no signal
Every astronomical calculation runs on the device. Out where there is no reception, the app still works — only the cloud forecast needs a connection.
Tonight’s conditions by city
Live figures computed for each city, updated with every build. Calculated July 26, 2026
| City | Sunset | Dark sky starts | Astronomical darkness | Moon-free darkness | Rating |
|---|---|---|---|---|---|
| Seoul | 19:46 | 21:31 | 6.3 h | 1.0 h | Poor |
| Tokyo | 18:50 | 20:31 | 6.5 h | 1.1 h | Poor |
| New York | 20:17 | 22:10 | 5.7 h | 0.4 h | Poor |
| London | 20:57 | 00:06 | 2.0 h | 0.0 h | Poor |
| Madrid | 21:35 | 23:28 | 5.8 h | 0.6 h | Poor |
| Sydney | 17:11 | 18:38 | 10.8 h | 0.2 h | Poor |
| Reykjavík | 22:50 | — | — | — | — |
| São Paulo | 17:41 | 19:00 | 10.4 h | 0.1 h | Poor |
- Seoul
- Busan
- Incheon
- Daegu
- Daejeon
- Gwangju
- Ulsan
- Suwon
- Jeonju
- Cheongju
- Changwon
- Jeju
- Gangneung
- Chuncheon
- Pohang
- Tokyo
- Osaka
- Sapporo
- Fukuoka
- Nagoya
- New York
- Los Angeles
- Chicago
- Houston
- Denver
- Seattle
- San Francisco
- Miami
- Las Vegas
- Toronto
- Vancouver
- Mexico City
- London
- Madrid
- Barcelona
- Paris
- Berlin
- Rome
- Amsterdam
- Dublin
- Lisbon
- Vienna
- Stockholm
- Oslo
- Reykjavík
- Athens
- Istanbul
- Dubai
- Singapore
- Hong Kong
- Taipei
- Bangkok
- Mumbai
- Sydney
- Melbourne
- Auckland
- Buenos Aires
- Santiago
- São Paulo
- Cape Town
The honest version
The app is free and carries ads. There is no subscription and no feature locked behind a paywall. Rewarded ads only extend the forecast beyond three days — today, tomorrow and the day after are always free. The star chart screen carries no ads at all.
Get tonight’s answer on your phone
Stargaze Tonight rates tonight’s observing conditions where you are, shows an hour-by-hour darkness strip, and tells you what is actually worth looking at. Free, ad-supported, no subscription.
Free with ads. No subscription, no locked features. Requires iPhone with iOS 17 or later.