StarsOut
Should you go outside tonight?
Great night tonight
Clear skies and dark conditions. Go outside.
Rio de Janeiro
7.6
out of 10
Clouds
39%
Moon
Waning Crescent
2% lit
Moon below horizon — perfect darkness
Best window
19:00 – 21:00
Sun ↓ 17:39·Dark from 18:39
Alert me on good nightsSky quality tonight
Best: 19:00–21:00This week’s nights
America/Sao PauloHow the score works
60% weight
Cloud cover
Layer-weighted across the best 2-hour window of the night. Low clouds block everything, thin high cirrus still lets bright stars through.
40% weight
Moon darkness
A new moon boosts the score. A full moon near midnight washes out all but the brightest stars. We ease the penalty after midnight when the moon is setting.