https://www.cnet.com/news/when-will-apple-announce-the-new-2018-iphones/

Fall is approaching soon. That means Apple is expected to announce its next series of iPhones, which includes followups to the iPhone 8, 8 Plus and iPhone X. And while we have no confirmation or knowledge of when the exact unveiling and release dates will occur (Apple did not reply for a request to comment), examining the dates that Apple picked over the past few years offers a rather consistent schedule to extrapolate some strong possibilities for the 2018 dates.

For the last six years, Apple held its iPhone announcements on either a Tuesday or Wednesday, and usually no later than the second full week of September. For 2018, this gives us four possible dates: Tuesday, Sept. 4; Wednesday, Sept. 5; Tuesday Sept. 11; and Wednesday, Sept. 12.