The company said its domestic sales increased by 1.8 per cent during the month to 90,399 units as against 88,801 units in September last year.
The company said its domestic sales had increased by 51.6 per cent during August to 76,018 units.
Sales of mini segment cars, including M800, Alto, A-Star and WagonR, increased by 4.9 per cent to 41,061 units, as compared to 39,150 units in the year-ago month, MSI said in a statement.
The company said sales of the compact segment comprising Swift, Estilo, Ritz rose by 16.9 per cent to 20,828 units in September this year as against 17,813 units last year.
MSI said sales of its popular compact sedan Dzire rose by 42.9 per cent during the month under review at 16,708 units as against 11,694 units in September, 2012.
The company's mid-sized sedan SX4 registered an increase of 31.3 per cent to 378 units as against 288 units in the same month last year. There was no sale of premium sedan Kizashi during the month.
Sales of utility vehicles, including Gypsy, Grand Vitara and Ertiga, stood at 2,657 units in September this year, down 63.2 per cent from 7,224 units in the corresponding month last year.
Sales of vans -- Omni and Eeco -- declined by 30.5 per cent to 8,767 units in September this year as compared to 12,620 units in the same period of previous year.
Exports during the month surged nearly three-fold to 14,565 units as compared to 5,187 units in September last year, the statement added.