Schwarzenegger was riding a Harley Davidson motorcycle with his son Patrick in the sidecar when another driver backed into the street, spokeswoman Margita Thompson said in a statement.
"The governor was unable to avoid the vehicle in his path and collided with it at a low speed," she said.
Both Schwarzenegger and his son were treated for cuts and bruises at St. John's Hospital in Santa Monica and released, Thompson said. Both were wearing helmets at the time, she said.
The other driver was uninjured.
The governor was expected to keep his appointments Monday. No further details were immediately released.