StarsOutAlert me on good nights
Should you go outside tonight?
Probably not tonight
Too much cloud cover for a good session.
Lima
3.8
out of 10
Low confidence
Currently overcast — score adjusted to match what the sky looks like now.
Peak 2h
8.121:00–23:00
Prime 21–01
8.021:00–01:00
Best this week
9.3Mon, Sep 7
Moon
Waning Gibbous
66% lit
Bright moon — reduces deep sky visibility
🔭 Moon up: 22:08–09:55
📍 NE · 39°
Full moon: Sep 26
Sky now
Mostly cloudy · 75%
Measured at SPJC · 8km away · 22min ago
Sun ↓ 18:04·Dark from 19:04·51% clouds
🔭
Moon visible today
06:10 – 11:01 · 66% lit · great for telescope viewing
Next great night
Thursday — 7.7
✨ Great night tonight
Sky quality tonight
Best: 21:00–23:00This week’s nights
America/LimaHow 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.