SHANGHAI, Sept 26 (Reuters) - China's central bank fixed its official yuan midpoint weaker than the key psychologically important 6.6 per dollar level for the first time in nearly a month on Tuesday.
Tuesday's official guidance came in at 6.6076 per dollar, 131 pips or 0.2 percent weaker than the previous fix of 6.5945 on Monday.
Tuesday's fix was the weakest since Aug.31.
China's yuan extended losses against the U.S. dollar on Monday afternoon, falling to its lowest in four weeks as of official local close.
(Reporting by Winni Zhou and David Stanway)