The California tech giant is expected to merge style and innovation, along with sensors and computing power, in a wrist-worn device that links wirelessly to iPhone or iPad.
Apple is believed to be planning a September 9 event at which it will introduce the iWatch, along with new-generation iPhone 6 smartphones with increased screen sizes.
The company has not sent out invitations to such an event, nor as is standard Apple practice has it commented on reports it will even take place.
Apple's next-generation iPhone are rumored to have screen sizes stretched to 4.7 and 5.5 inches and have faster processors.
Apple typically updates its product cycle in the second half of the year, getting a lift from holiday sales.
Last year it unveiled the iPhone 5s (Pictures) and the lower-priced iPhone 5C (Pictures) in September, getting record sales at the launch.
Apple is tuning a new operating system which allows for mobile payments and includes a health platform, which could mesh nicely with an "iWatch" for tracking activity, sleep, pulse and more.
The system iOS8 is expected to be in the new iPhone.
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