Gurman believes there's more in store for the Health app, too. Ming-Chi Kuo believes temperature tracking is possible for watchOS 9 and the series 8, as well we'll soon see if he's correct!

If so, watchOS 9 will enable that new hardware feature. Now, Gurman is positing that a body-temperature sensor is coming to the Apple Watch 8. This would have been a useful feature in the age of Covid, and assist people IN tracking their fertility, but it failed to appear in the Series 7. watchOS 9 Rumorsīack in 2021, Bloomberg's Debby Wu and Mark Gurman predicted that Apple would add a body temperature sensor to the Apple Watch 7. My guess is that the Apple Watch 3 will not be compatible with watchOS 9, and Apple analyst Ming-Chi Kuo agrees. So, will watchOS 9 be compatible with the same Apple Watch models as watchOS 8, or will Apple drop compatibility for some models? There's no way to know for sure, but if previous Apple Watch software updates are any indicator, at least one (if not two) Apple Watch models will not be compatible. With watchOS 7, Series 1 and 2 were left behind. watchOS 8 is compatible with Apple Watch Series 3, 4, 5, 6, and SE and comes pre-installed on Apple Watch Series 7. When Apple rolled out watchOS 6, every model that could download OS 5 was included.

WatchOS 5 was the first operating system to leave an older model, the Apple Watch first generation, behind. Image courtesy of Apple Apple Watch Software Update Compatibility

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