Schwarzenegger donned a cowboy hat for the video, wishing San Antonio a happy birthday.
"300 years, that is unbelievable," he said. "This is much older than the United States."
Schwarzenegger called San Antonio a "fantastic city" and said "everything [is] great." He noted a "great after-school program," which is the After-School All-Stars program that he founded.
The Terminator actor even included his character's famous "Hasta la vista, baby" line.