The exchanges had generated a business of Rs 24.46 lakh crore in the same period last year, the commodity markets regulator said in a statement.
Much of the turnover was from energy basket, especially crude oil, followed by metals and agri-commodities.
According to the FMC, the turnover from energy items rose by almost 50 per cent to Rs 8.04 lakh crore in April-August of the 2015-16 fiscal from Rs 5.37 lakh crore year-ago.
However, the turnover from bullion declined marginally to Rs 8.60 lakh crore till August from Rs 8.65 lakh crore Year-ago.
The government has notified merger of FMC with the capital markets regulator Sebi from September 28. Sebi will oversee the functioning of commodity exchanges.
Currently, there are three national and six regional commodity exchanges operating in the country.