You can only find them during the day.
These appear only at night but don't get too close or you'll bother them, forcing them to disperse and leave the area.
They may not be always in the area however, they do appear around in the afternoon.
This street performer is present in the spot marked in the map in the late morning near noon and on sunny days. He's located near the Bushman.
Appears for a specific period of time. I was able to find him around 7:45 AM in front of the Coit Tower.
This costumed fellow is found early evening in clear weather.
Appears for a specific period of time. I was able to find him around 2PM game time
Like other performers, these are only available when the weather's clear, around late afternoon.
This dancer does her routine when it's not raining, in the morning.