"As despatches will continue till midnight of September 30, the final tally for the month is expected to be much higher," the company said in a statement.
The company had sold 468,670 units of two-wheelers in September 2013.
In the past, Hero MotoCorp had crossed the 6-lakh plus monthly milestone in two previous occasions - in October 2013 when it sold 6.25 lakh units and in May 2014 when it sold 6.02 lakh units of two-wheelers.
Hero MotoCorp said it has lined up over 10 new product launches, including refreshes and variants, which will reach all dealerships across the country during the festive season.