StarsOut
Should you go outside tonight?
Great night tonight
Clear skies and dark conditions. Go outside.
Oulu
8.9
out of 10
Cautious estimate
Models split — score biased toward the cloudier forecast.
Peak 2h
10.006:00–08:00
Prime 21–01
9.521:00–01:00
Best this week
8.2Fri, Jul 17
Moon
Waxing Crescent
5% lit
Moon doesn’t interfere — perfect darkness
🔭 Moon up: 06:26–23:30
📍 NE · 1°
Full moon: Jul 29
Sun ↓ 23:27·Dark from 00:27·36% clouds
Alert me on good nightsSky quality tonight
Best: 06:00–08:00This 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.