The next major U.S. economic indicator will be Friday's retail sales report for July.
Reduced liquidity as investors and traders take summer vacations is also seen as exacerbating price moves.
The Australian dollar hit $0.7713 after it advanced to a more than three-month peak of $0.7756, buoyed this week by Australia's relatively high yields and stronger investor appetite for risk.
"Part of the Australian dollar's resilience is the lack of follow-through in pricing for a Fed hike in September, limiting the U.S. dollar's gains," analysts at Westpac said in a note.
The British pound recovered some of its recent weakness, rising 0.05 percent to $1.3007, recovering from $1.2956 on Tuesday, its lowest since July 11.
The Reserve Bank of New Zealand is expected to be the next central bank to ease conditions, by cutting rates on Thursday by 25 basis points to 2.00 percent.
The kiwi gained 0.78 percent against the U.S. dollar to $0.72.