Bank tellers say he handed them a note demanding money and pulled out a knife.
The tellers complied and handed the suspect an undisclosed amount of cash.
The suspect exited the bank and was last seen southbound on Hamner Avenue.
He's described as a white male adult in his early 40s, approximately 6 feet to 6 feet 2 inches tall, weighing 200 pounds, with short brown hair, wearing sunglasses and a red USC hoodie and blue jeans.
Anyone with information is asked to contact the Jurupa Valley Station at (951) 955-2600.
After hours and on weekends, the watch Ccommander can be reached at (951) 776-1099.
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