(Yicai Global) Sept. 20 -- The central parity rate of the yuan against the US dollar decreased 140 basis points before the opening of the interbank market today, hitting a new high since the start of the month.

The China Foreign Exchange Trade System (CFETS), the interbank trading and foreign exchange division of China's central bank, the People's Bank of China (PBOC), set the yuan central parity rate at 6.5670 against the dollar, compared with the official close of 6.5859 on Sept. 19.

The onshore spot exchange rate of the yuan against the dollar fell to 6.5860 at the close of night trading on Sept. 19, while the offshore rate dipped to 6.5874.

The dollar index stiffened by 0.005 point to 91.816 at 9.22 a.m. on Sept. 20.