StarsOutAlert me on good nights
Should you go outside tonight?
Probably not tonight
Too much cloud cover for a good session.
Helsinki
3.5
out of 10
Peak 2h
6.503:00–05:00
Prime 21–01
3.121:00–01:00
Best this week
9.2Sun, Sep 6
Moon
Waning Gibbous
84% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 20:26–10:45
📍 S · 37°
Full moon: Sep 26
Sky now
Mostly cloudy · 75%
Measured at EFHK · 17km away · 10min ago
Sun ↓ 20:28·Dark from 21:28·98% clouds
🔭
Moon visible today
06:15 – 09:24 · 84% lit · great for telescope viewing
Next great night
Wednesday — 8.1
✨ Great night tonight
Sky quality tonight
Best: 03:00–05:00This 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.