"We have made no decisions about September, we don't...do that in advance," Powell said at the press conference following the latest Federal Open Market Committee meeting. He said going forward, "we'll be taking that information" about the economy in the run-up to the next central bank gathering.

MSCI's global equities gauge stumbled on Wednesday while the U.S. dollar extended gains after Federal Reserve chair Powell dampened investor hopes for an interest rate cut in September, saying that it was too soon to make a decision and copper prices tumbled on hefty U.