The robbery was reported at about 4:10 a.m. near the intersection of 11th and Mission streets.
The 28-year-old victim was approached by a man who demanded her property, according to police.
As two other men also approached the woman, she became frightened and complied with the demand, police said.
The suspects fled with the items, and remain at large.
The victim was not injured during the robbery.
Anyone with information about the case is encouraged to call the Police Department's anonymous tip line at (415) 575-4444 or send a tip by text message to TIP411.