The Colombo Consumer Price Index rose 1.3 percent to 167.1 points during the month, with the food component in the index suddenly rising 2.4 percent.
The index which rose to 166.7 points in July following a sharp depreciation of the currency fell in absolute terms for three months in a row.
The rupee also gained with tighter monetary policy involving outright sales of its Treasury bills to mop up liquidity.
From October monetary policy loosened with the central bank printing and injecting large volumes of one month money into the banking system at around 200 points below market interest rates, halting the strengthening of the currency.
Government borrowing pressures, which eased with the sale of a sovereign bond in July has also started to hit credit markets.