https://wccftech.com/download-watchos-7-beta-3/

watchOS 7 beta 3 is now available as an over the air download for Apple Watch developers. Here's how you can download it.

Those running watchOS 7 beta 2 will be pleased to learn that the third beta is now available for download. Packed with loads of bug fixes, it is recommended that you update your Apple Watch to the latest release right now if you want things to be as stable as possible. In order to do that, follow the steps outlined below: