In the same month last year, it had sold 4,04,787 units, Hero MotoCorp said in a statement.
Hero MotoCorp Senior Vice President (Marketing and Sales) Anil Dua said: "Our performance in September is a result of the strong retail growth we have reported throughout the first half of this financial year.
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"Our 16% growth in despatch sales in September has come on the back of a consistent 7% growth in our retails this year."
In September, the company commenced construction of its Centre of Global Innovation and Research & Design (R&D) at Kukas, on the outskirts of Jaipur in Rajasthan, with an investment of Rs 450 crore.
This facility will be ready for operations by the first quarter of calendar year 2015.