However, Honda Cars India and Mahindra & Mahindra reported decline in sales last month reflecting "fragmented recovery" that the auto industry is witnessing.
Market leader Maruti Suzuki India said its domestic sales increased by 8.6 per cent during the month to 1,06,781 units, as against 98,304 units in August 2014.
Sales of mini segment cars, including, Alto and WagonR, increased by 8.6 per cent to 37,665 units as compared to 34,686 units in the year-ago month, MSI said in a statement.
Rival Hyundai Motor India saw its highest ever monthly domestic sales at 40,505 units last month as compared to 33,750 units in August 2014, up 20.01 per cent.
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"The growth has been led by the new SUV Creta, Elite i20 and i20 Active. While the Creta has done about 7,400 units, other models have also contributed to the overall growth," HMIL senior vice-president (sales and marketing) Rakesh Srivastava said.
Hyundai recorded highest-ever single month sales with a volume of 40,505 units and growth of 20 per cent over the last year, led by strong youthful product portfolio, he added.
Its domestic passenger vehicles sales rose 2 per cent at 11,194 units as against 10,975 units in the same month of previous year.
"The growth that we are seeing in the industry is because of the new models. If you take out the new models, industry growth will be in the negative," Tata Motors President (Passenger Vehicles Business Unit) Mayank Pareek told PTI.
This is a concern as August is the time when usually sales start picking up, which hasn't happened this time, he said, adding that the 'pain areas' of the industry were mainly dip in consumer sentiment and expectation of a cut in interest rates making customers postpone purchases.
Honda Cars India reported 6.58 per cent decline in its domestic sales at 15,655 units in August, despite the launch of its new Jazz in July.
Utility vehicle major Mahindra & Mahindra saw its domestic sales decline 3.10 per cent to 32,122 units last month as against 33,150 units in the same month last year.
"While currently we are witnessing fragmented recovery in auto sales, we are hopeful that the upcoming festive season will provide a much needed fillip to the auto industry," M&M Chief Executive (Automotive Division) Pravin Shah said.