watchOS 27 Siri Upgrade: AI Assistant and Perimenopause Tools Explained

Before WWDC 2026, the consensus on watchOS 27 was polite and unexciting. Bloomberg's Mark Gurman told readers to expect AI features, stability work, and "not much, really" beyond that, and 9to5Mac summarized those expectations in March. What Apple announced today is still narrower than a typical platform release. It's also more targeted than the preview implied. Two additions define this release: a substantially rebuilt Siri powered by Apple Intelligence, and Health app tools that notify users when logged cycle data shows changes consistent with perimenopause. Together, they push the Watch toward roles Apple hasn't fully committed to before: a wrist-based assistant capable of sustained conversation, and a health monitor that flags a specific, significant life-stage transition that consumer technology has largely sidestepped. Apple moved through the announcement quickly. Engadget called it a "whistlestop tour" of its OS development. What follows covers what both features actually do, wh