StarsOutAlert me on good nights
Should you go outside tonight?
Probably not tonight
Too much cloud cover for a good session.
Mauna Kea
4.4
out of 10
Peak 2h
7.402:00–04:00
Prime 21–01
3.821:00–01:00
Best this week
7.7Fri, Sep 4
Moon
Waning Gibbous
91% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 20:21–09:17
Full moon: Sep 26
Sun ↓ 18:38·Dark from 19:38·61% clouds
🔭
Moon visible today
06:06 – 08:35 · 91% lit · great for telescope viewing
Next great night
Friday — 7.7
✨ Great night tonight
Sky quality tonight
Best: 02:00–04:00This week’s nights
Pacific/HonoluluHow 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.