In the previous reporting week, the reserves had touched a life-time high of $355.46 billion.
Foreign currency assets (FCAs), a major component of overall reserves, decreased by $216.6 million to $330.500 billion, the data showed.
FCAs, expressed in dollar terms, include the effect of appreciation and depreciation of non-US currencies such as the euro, pound and the yen, held in the reserves.
The country's gold reserves remained unchanged at $19.34 billion.
The special drawing rights with the International Monetary Fund were down by $15.8 million to $4.063 billion in the week under review, while India's reserve position with the financial institution declined by $5.1 million to $1.317 billion, the apex bank said.