In the previous week, the reserves had touched a life time high of $402.509 billion after rising by $1.782 billion.
The foreign currency assets (FCA), a major component of the overall reserves, decreased by $259.3 million to $377.751 billion, the data showed.
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Expressed in US dollar terms, the FCAs include effect of appreciation or depreciation of non-US currencies such as the euro, the pound and the yen held in the reserves.
Gold reserves remained unchanged at $20.691 billion. The special drawing rights with the International Monetary Fund (IMF) declined by $1.2 million to $1.512 billion.
The country's reserve position with the IMF declined by $1.8 million to $2.291 billion, the apex bank said.