When can I download and install watchOS 5? WatchOS 5 officially launches on September 17, 2018. WatchOS 5 includes new workouts, a redesigned user interface, walkie-talkie, advanced running features and many more improvements. Newest iPhone FAQs Do AirPods measure health data? How can I watch March Madness on iPhone? Does my HomePod have temperature / humidity sensors? tags: watchOS