StarsOutAlert me on good nights
Should you go outside tonight?
Might be worth a look
Partial clearing expected. Keep an eye out.
Portland
5.5
out of 10
Peak 2h
6.800:00–02:00
Prime 21–01
5.621:00–01:00
Best this week
9.3Sat, Sep 5
Moon
Waning Gibbous
84% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 20:43–10:35
📍 SW · 42°
Full moon: Sep 26
Sun ↓ 19:50·Dark from 20:50·90% clouds
🔭
Moon visible today
06:32 – 09:24 · 84% lit · great for telescope viewing
Next great night
Thursday — 7.0
🌙 Good night ahead
Sky quality tonight
Best: 00:00–02:00This week’s nights
America/Los AngelesHow 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.