StarsOutAlert me on good nights
Should you go outside tonight?
Probably not tonight
Too much cloud cover for a good session.
Lisbon
4.0
out of 10
Peak 2h
5.101:00–03:00
Prime 21–01
4.421:00–01:00
Best this week
8.6Sun, Jun 7
Moon
Waning Gibbous
98% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 21:34–06:32
📍 S · 20°
Sky now
Clear · 13%
Measured at LPPT · 7km away · 31min ago
Sun ↓ 20:55·Dark from 21:55·73% clouds
🔭
Moon visible today
18:56 – 20:55 · 98% lit · great for telescope viewing
Next great night
Saturday — 8.2
✨ Great night tonight
Sky quality tonight
Best: 01:00–03:00This 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.