StarsOut
Should you go outside tonight?
Great night tonight
Clear skies and dark conditions. Go outside.
Lisbon
8.4
out of 10
Low confidence
Models disagree on tonight — actual conditions may be cloudier.
Peak 2h
8.722:00–00:00
Prime 21–01
8.621:00–01:00
Best this week
9.0Tue, Jul 21
Moon
Waxing Crescent
5% lit
Moon doesn’t interfere — perfect darkness
🔭 Moon up: 08:40–22:39
Full moon: Jul 29
Sky now
Clear · 13%
Measured at LPPT · 7km away · 25min ago
Sun ↓ 21:00·Dark from 22:00·54% clouds
Alert me on good nightsSky quality tonight
Best: 22:00–00:00This week’s nights
Europe/LisbonHow 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.