The man entered the Wells Fargo Bank near the intersection of Fair Oaks Boulevard and Munroe Street about 10:45 a.m. and gave the teller a note demanding cash. The teller didn't see a weapon but the robber indicated he was armed, according to the FBI.
The robber is described as a black man in his early 30s, about 180 pounds and 6 feet tall. The Giants cap was red and "San Francisco" was embroidered on the brim.
The case is being investigated by the Sacramento Violent Crimes Task Force, comprised of FBI agents and Sacramento County Sheriff's detectives.
Anyone with information is asked to call the FBI at (916) 481-9110 or deputies at (916) 874-5115. Tipsters may remain anonymous and could be eligible for a reward by calling Crime Alert at (916) 443-4357.