StarsOut
Should you go outside tonight?
Drop everything — go outside
Near-perfect conditions. Nights like this are rare.
Helsinki
9.8
out of 10
Peak 2h
9.923:00–01:00
Prime 21–01
9.721:00–01:00
Best this week
8.8Wed, Jul 22
Moon
Waxing Crescent
11% lit
Moon doesn’t interfere — perfect darkness
🔭 Moon up: 08:50–23:11
Full moon: Jul 29
Sky now
Clear · 0%
Measured at EFHK · 17km away · 18min ago
Sun ↓ 22:26·Dark from 23:26·40% clouds
Alert me on good nightsSky quality tonight
Best: 23:00–01:00This 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.