The Perseids this year will be competing with moonlight each night. In San Francisco, the waxing gibbous moon rises at 10:37 pm on Friday 11th, 11:12 pm on Saturday 12th, and 11:49 pm on Sunday 13th. So take in the view while the moon is below the horizon and enjoy a few hours of meteors each evening. Meteor showers tend to get better as the night goes on, so Saturday and Sunday offer better chances of seeing meteors than Friday. Best of luck, enjoy, and have fun!