On June 8, 2026, Apple formally introduced watchOS 27 at the WWDC 2026 event, subsequently launching a developer beta version. The public beta was made available in mid-July, with the official release anticipated in the autumn season. watchOS 27 has notably raised the bar for system compatibility, supporting all compatible models except for the Apple Watch Ultra 3. A key feature of this update is the advanced integration of Siri AI, which now facilitates multi-turn dialogues and personalized information retrieval, necessitating an iPhone that supports Apple Intelligence. The system's interface and functionalities have seen numerous enhancements, such as the Dynamic app grid layout, Smart Stack recommendations, a refined Liquid Glass interface, the standalone Workout Buddy feature, and a completely revamped Find My app. The Workout Buddy function operates autonomously, capturing 12 key metrics including distance, pace, and workout duration, without the need for an iPhone connection. It also introduces a tiered system for setting training goals. According to tests conducted by professional athletes, the new algorithm boosts the precision of motion trajectory recording to an impressive 98.7%. Moreover, watchOS 27 refines sleep tracking and step count synchronization, and resolves previous issues related to step count accuracy.