WatchOS 8

watchOS 8 is the eighth major release of the watchOS operating system that is in development at Apple for the Apple Watch series

Product history
watchOS 8 is derived from iOS 15; both were announced on June 7 at the 2021 Worldwide Developers Conference. Both are to be released on September 20, 2021.

Supported models
Models that could run watchOS 7 are supported by watchOS 8, though not all features may be available on older models. An iPhone 6 S or later running at least iOS 15 is required.
 * Apple Watch Series 3
 * Apple Watch Series 4
 * Apple Watch Series 5
 * Apple Watch SE
 * Apple Watch Series 6
 * Apple Watch Series 7 (new model)