StarsOutAlert me on good nights
Should you go outside tonight?
Probably not tonight
Too much cloud cover for a good session.
Cambridge
3.3
out of 10
Cautious estimate
Models split — score biased toward the cloudier forecast.
Peak 2h
7.700:00–02:00
Prime 21–01
4.421:00–01:00
Best this week
6.9Wed, Sep 2
Moon
Waning Gibbous
91% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 20:17–10:11
Full moon: Sep 26
Sun ↓ 19:52·Dark from 20:52·65% clouds
🔭
Moon visible today
06:09 – 08:35 · 91% lit · great for telescope viewing
Sky quality tonight
Best: 00:00–02:00This week’s nights
Europe/LondonHow 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.