Barring any unwanted fog in Sn Francisco tonight, you'll be able to join the rest of humanity and view the "Blood Moon" as it passes over the Bay Area later tonight.
First, what's a Blood Moon, you ask? Technically, it's a total lunar eclipse that will turn the moon a lovely orange color as the earth passes between the moon and the sun.
The fun starts at about midnight and will peak at about 12:45 a.m. If you can hang that late, there are some organized viewing parties for you to attend. Here's two we read about:
If you feel like staying home to check out the amazingness, here's a general schedule of the eclipse for Pacific Daylight Time
And if you've not yet recovered from the weekend and plan to be in bed by 10 p.m., we hear there will be another Blood Moon on October 8.