StarsOut
Should you go outside tonight?
Drop everything — go outside
Near-perfect conditions. Nights like this are rare.
Tampere
9.1
out of 10
Cautious estimate
Models split — score biased toward the cloudier forecast.
Peak 2h
10.000:00–02:00
Prime 21–01
9.921:00–01:00
Best this week
9.3Fri, Jul 17
Moon
Waxing Crescent
5% lit
Moon doesn’t interfere — perfect darkness
🔭 Moon up: 07:01–23:20
Full moon: Jul 29
Sun ↓ 22:45·Dark from 23:45·52% clouds
Alert me on good nightsSky quality tonight
Best: 00:00–02:00This 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.