Josue Abraham Rosales, 30, was last seen at 4 p.m. on the beach near the Santa Monica Pier, Santa Monica police said.
Rosales is described as 5 feet 5 inches tall and weighs around 230 pounds. He was last seen wearing a dark shirt with "America" printed on it, blue jeans, a gray baseball cap and black Converse shoes.
Police said Rosales has the mental capacity of a 12-year-old and suffers from schizophrenia.
If you have seen him, you're asked to call the Santa Monica Police Department at (310) 458-8491.