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Availability date from Apple's[2] own newsroom post (https://www.apple.com/newsroom/2026/09/get-ready-to-experience-iphone-18-pro-the-new-apple-watch-lineup-and-airpods-5/), which names Apple Watch Ultra 4 among the products available to pre-order and says the Apple Watch line is 'available in stores and online worldwide beginning Friday, September 18'. September 18, 2026 is the on-sale day.
Apple's[1] Ultra 4 tech-specs page gives the 49mm x 44mm x 12mm Grade 5 titanium case at 63.0 g, a flat sapphire display with "3000 nits peak brightness", 100m water resistance, EN13319 diving to 40m and satellite communications.
Smartwatch Insight's own reporting states the device was "Announced: September 9, 2026," one day after the pin's stored 8 September 2026 date, with in-store availability beginning "Friday, September 18, 2026."
The 5K Runner corroborates, noting the announcement was expected "Wednesday, September 9, 2026" and was confirmed accurate that day, one day after the pin's stored date, with shipping "likely towards the latter half of September."
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