StarsOut
Should you go outside tonight?
Great night tonight
Clear skies and dark conditions. Go outside.
Phoenix
7.7
out of 10
Peak 2h
8.601:00–03:00
Prime 21–01
7.521:00–01:00
Best this week
9.5Sat, Jul 18
Moon
Waxing Crescent
2% lit
Moon doesn’t interfere — perfect darkness
🔭 Moon up: 06:50–20:59
📍 W · 3°
Full moon: Jul 29
Sky now
Clear · 0%
Measured at KA39 · 53km away · 5min ago
Sun ↓ 19:38·Dark from 20:38·98% clouds
Alert me on good nightsSky quality tonight
Best: 01:00–03:00This week’s nights
America/PhoenixHow 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.