Based on "sources who have proven accurate in the past," iMore said, the two devices would be unveiled at a special event Sept. 12.
French site App4Phone.fr said information from Chinese manufacturing sources also put Sept. 21 as the release date for the iPhone, CNET reported Monday.
Although not reporting a launch date for the 7-inch screen iPad Mini, iMore said it could be available the same day as the iPhone.
Most Apple-watching sites are reporting the new iPhone would offer a 4-inch, 16:9 screen, and that all new Apple iOS devices would come with a smaller dock connector.
The spacing between the announcement and the on-sale date would mirror last year's schedule when Apple unveiled the iPhone 4S on October 4 and then released it for sale 10 days later, CNET said.