https://techcrunch.com/2019/09/10/ios-13-will-be-available-on-september-19/

Apple announced in a press release that iOS 13 will be available on September 19. Even if you don’t plan on buying a new iPhone, you’ll be able to get a bunch of new features.

But that’s not all. iOS 13.1 will be available on September 30. Apple had to remove some features of iOS 13.0 at the last minute as they weren’t stable enough, such as Shortcuts automations and the ability to share your ETA in Apple Maps. That’s why iOS 13.1 will be released shortly after iOS 13.