The dollar index, which measures the greenback against six major peers, increased 0.05 percent to 108.6750.
In late New York trading, the euro was up to 0.9965 U.S. dollars from 0.9963 dollars in the previous session, and the British pound was down to 1.1788 U.S. dollars from 1.1818 dollars in the previous session. The Australian dollar decreased to 0.6906 U.S. dollars from 0.6922 dollars.
The U.S. dollar bought 137.09 Japanese yen, higher than 136.85 Japanese yen of the previous session. The U.S. dollar was up to 0.9670 Swiss francs from 0.9647 Swiss francs, and it was up to 1.2976 Canadian dollars from 1.2964 Canadian dollars.
Powell is set to make a keynote speech Friday at the central bank's Jackson Hole symposium.
"The markets will be listening to every word Mr. Powell has to say to glean any insight on how much the Fed will raise rates on Sept. 21," Kevin Matras, executive vice president at Zacks Investment Research, said Wednesday in a note.
"In addition, they'll be looking for any hints on what comes after that," he said.
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