WatchOS 6

watchOS 6 is the sixth major release of watchOS for the Apple Watch series developed and distributed by Apple Inc. It was announced at the 2019 Worldwide Developers Conference alongside iOS 13, iPadOS, tvOS 13 and macOS Catalina.

Product history
watchOS 6 is derived from iOS 13; both were announced on June 3, 2019 during the keynote address at WWDC 2019, when it became available to developers. It was released to the public on September 19, 2019.

Supported models
Support for Apple Watch Series 1 and 2 was initially not included and came later with version 6.1 on October 29, 2019.
 * Apple Watch Series 1 (limited support)
 * Apple Watch Series 2 (limited support)
 * Apple Watch Series 3
 * Apple Watch Series 4
 * Apple Watch Series 5 (included with initial release)

Articles

 * Apple releases iOS 13.6, iPadOS 13.6, macOS 10.15.6, tvOS 13.4.8, watchOS 6.2.8 by Mike Peterson at AppleInsider (2020-07-15)