StarsOut
Should you go outside tonight?
Drop everything — go outside
Near-perfect conditions. Nights like this are rare.
Montreal
9.6
out of 10
Peak 2h
10.021:00–23:00
Prime 21–01
10.021:00–01:00
Best this week
10.0Thu, Jul 16
Moon
Waxing Crescent
2% lit
Moon doesn’t interfere — perfect darkness
🔭 Moon up: 07:58–22:12
Full moon: Jul 29
Sky now
Clear · 0%
Measured at CWTA · 1km away · 38min ago
Sun ↓ 20:40·Dark from 21:40·20% clouds
Alert me on good nightsSky quality tonight
Best: 21:00–23:00This week’s nights
America/TorontoHow 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.