The company had sold 51,471 units in the same month last year, HMIL said in a statement.
In the domestic market, Hyundai sold 42,505 units last month as compared with 35,041 units in September 2014, up 21.3 per cent.
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The company's exports were, however, down 14.6 per cent to 14,030 units as against 16,430 units in the same month last year.
HMIL Senior Vice-President (Sales and Marketing) Rakesh Srivastava said: "Hyundai grew by 21.3 per cent with its highest-ever monthly domestic sales of 42,505 units in a single month in its last 17 years on the strong performance of its modern premium brands like CRETA, Elite i20, i20 Active and Grand.