StarsOutAlert me on good nights
Should you go outside tonight?
Not worth it tonight
Clouds will block the view. Stay inside.
Oulu
2.4
out of 10
Peak 2h
5.002:00–04:00
Prime 21–01
1.721:00–01:00
Best this week
9.0Sat, Sep 5
Moon
Waning Gibbous
91% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 20:14–11:01
Full moon: Sep 26
Sun ↓ 20:46·Dark from 21:46·99% clouds
🔭
Moon visible today
05:54 – 08:35 · 91% lit · great for telescope viewing
Next great night
Wednesday — 8.7
✨ 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.