The Apple Watch Series 9 45mm is the larger size of the Series 9 family and is expected to be released in September 2023. It is rumored to have a number of new features and improvements over the Series 8.

• A new temperature sensor to track body temperature over time.
• A new low-power mode to extend battery life.
• A faster processor.
• A better display with improved brightness and contrast.
• A more durable design.
• Other minor improvements, such as a new double-tap gesture and improved U2 ultrawide-band capabilities.