When does Apple usually release iOS, iPadOS and macOS?

Historically, Apple releases all of its major iOS/iPadOS and macOS updates shortly after announcing the dates in its Fall Keynote. Since 2021, the updates usually go live on a Monday.

Apple began aligning the releases of each major operating system in the fall, starting with iOS 7 and Mac OS X 10.9 Mavericks. The exceptions to the bundled iOS/iPadOS releases were iPadOS 13 (on September 24, 2019) and iPadOS 16 (on October 24, 2022).
Chart: Alexander KäßnerSource: Wikipedia, Apple Download imageCreated with Datawrapper