Apple hinted at new, faster networking capabilities in the invitation for the event, which read: "Hi, Speed."
This year, however, Apple executives had warned investors that new iPhones were not likely to ship until October. Apple held an event in September to introduce new Apple Watch and iPad models.
Analysts expect Apple to show a new version of the iPhone with 5G connectivity at the event. Analysts have also highlighted possible new AirPods over-ear wireless headphones and tags for finding lost items using wireless signals.
Apple shares have soared this year even as the coronavirus has crippled economies around the world, thanks in large part to booming sales of work-from-home items.
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Even though Apple stock has fallen from a record high on Sept. 2, it remains near a $2 trillion stock market valuation.