StarsOut
Is tonight good for stargazing in Rio de Janeiro?
Great night tonight
Clear skies and dark conditions. Go outside.
Rio de Janeiro
Tonight's score
8.0
out of 10
Sun ↓ 17:56Dark 19:13–04:0333% cloud, 19:13–04:03
Best 2 hours
8.721:00–23:00
Evening, 21–01
8.421:00–01:00
Best this week
7.4Sat, Oct 17
Parts of the night. The score above covers the whole dark window.
Moon
Waxing Crescent
19% lit
Moon doesn’t interfere — perfect darkness
Moon up: 07:41–21:47
Visible in daylight from 07:41 until sunset
📍 SE · 1°
Full moon: Oct 26
Sky quality tonight
Best 2 hours: 21:00–23:00This week’s nights
America/Sao PauloHow the score works
60% weight
Cloud cover
Averaged over the whole dark window, layer by layer. Low cloud blocks everything; thin high cirrus still lets bright stars through.
40% weight
Moon darkness
A new moon boosts the score. A bright Moon only costs points while it is actually above the horizon in the dark hours, and more the higher it stands.