Apple will hold a media event on 9 September when it is widely expected to launch the iPhone 6.
The latest report of a launch date comes from sources speaking to the well-regarded website Recode. Apple has, as usual, declined to comment on the speculation.
Apple is widely reported to be ready to launch two models of the iPhone 6, one with a 4.7in screen and one with a much larger 5.5in screen. Reports last week suggested that Apple could be pushing back the launch of the iPhone 6 in store as Tuesday, 14 October.
Apple typically launches its latest iPhone within 10 days of the media event at which it is launched, though back in 2010 it was 17 days between the unveiling of the iPhone 4 and its launch in store.
This week a fire at a metal polishing plant in China was reported to have impacted the release date of the iPhone 6.
Apple's new iPhones are set to meet pent up demand for a larger screen iPhone with Apple reported to have put in an order for 80 million new iPhones from its suppliers in China - 20 million more than it ordered last year.
As well as larger screens, Apple is expected to include a more powerful A8 chip, an improved camera and potentially a sapphire display covering the screen.
The phone will also launch alongside iOS 8 which bring a host of new features including Healthkit integration, improved maps, third-party keyboards, interactive notifications and closer integration with the Mac OS X desktop software.
Apple is also widely expected to launch its much talked-about iWatch before the end of the year, but it is not expected to be launched at the event in September.