WeatherKit is not an app itself — rather, it's an API (or a framework, in Apple lingo) that's meant to replace the Dark Sky API Apple has deprecated and is planning to kill off completely by 2023.

Android has been leveraging the more efficient Vulcan API for many years. With Android 16’s new changes, Google is doubling down, requiring devices to support the new Host Image Copy feature.

So it wasn't any surprise when Google and Qualcomm announced last year that they were planning to make the Neural Networks APIs that power those features on Android updateable via Google Play ...

As of this API shutdown announcement, Google has said nothing about the Google Fit apps on Android, Wear OS, and iOS. They still work to track activity and house your full archive.