StarsOutAlert me on good nights
Should you go outside tonight?
Probably not tonight
Too much cloud cover for a good session.
Porto
3.8
out of 10
Low confidence
Currently overcast — score adjusted to match what the sky looks like now.
Peak 2h
7.000:00–02:00
Prime 21–01
6.221:00–01:00
Best this week
8.8Thu, Sep 3
Moon
Waning Gibbous
91% lit
Very bright — stick to planets and the moon itself
🔭 Moon up: 20:43–09:20
📍 SW · 40°
Full moon: Sep 26
Sky now
Mostly cloudy · 75%
Measured at LPPR · 10km away · 19min ago
Sun ↓ 20:11·Dark from 21:11·55% clouds
🔭
Moon visible today
07:00 – 08:35 · 91% lit · great for telescope viewing
Next great night
Wednesday — 8.3
✨ Great night tonight
Sky quality tonight
Best: 00:00–02:00This week’s nights
Europe/LisbonHow 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.