StarsOutAlert me on good nights
Should you go outside tonight?
Probably not tonight
Too much cloud cover for a good session.
Turku
4.2
out of 10
Peak 2h
6.202:00–04:00
Prime 21–01
4.221:00–01:00
Best this week
9.0Sat, Sep 5
Moon
Waning Gibbous
84% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 20:36–10:58
📍 W · 19°
Full moon: Sep 26
Sun ↓ 20:40·Dark from 21:40·97% clouds
🔭
Moon visible today
06:25 – 09:24 · 84% lit · great for telescope viewing
Next great night
Wednesday — 8.4
✨ Great night tonight
Sky quality tonight
Best: 02:00–04:00This week’s nights
Europe/HelsinkiHow 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.