The company had sold 4,30,724 units in September last year, HMSI said in a statement.
Sales in September 2016 was its best-ever monthly sales, breaking the previous record of 4.92 lakh in August this year, it added.
Domestic sales grew 31 per cent to 5,39,662 units as against 4,11,635 in the same month last year.
Scooter sales were at 3,55,655 units as compared with 2,64,408 in September 2015, up 35 per cent, while motorcycle sales grew 25 per cent to 1,84,007 units in September 2016 as against 1,47,227 units in the year-ago month.
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On the festive season sales, he said the company had started planning six months back.
"By leveraging the 12 lakh additional production bandwidth coming from the fourth plant, Honda is for the first time ever ensuring ready availability of all its models, including Activa, throughout the festive season right up to its last-mile rural network," Guleria said.
HMSI said it also had record exports in September at 29,349 units as compared with 19,089 in the same month last year, a growth of 53.75 per cent.