SHANGHAI, Sept 20 (Reuters) - China's central bank lowered its official yuan midpoint on Wednesday to 6.5670 per dollar, the weakest level since Sept. 1, reflecting softness in spot yuan a day earlier.
It was the second straight day of a weaker midpoint fixing.
Wednesday's midpoint is 140 pips or 0.21 percent weaker than Tuesday's fix of 6.5530.
China's onshore spot yuan weakened against the U.S. dollar on Tuesday. (Reporting by Winni Zhou and Andrew Galbraith; Editing by Richard Borsuk)