The yen also gained ahead of a U.S. presidential debate between Democrat Hillary Clinton and Republican Donald Trump at 9 p.m. ET (0100 GMT on Tuesday), as well as Moody's move to cut Turkey's sovereign rating to "junk" on Friday and an uncertain outcome to an OPEC meeting.
Analysts said uncertainty over the impact of the U.S. presidential debate hurt the dollar since the nervousness was specific to the United States. The dollar index, which measures the greenback against a basket of six major currencies, was last down 0.21 percent at 95.272.
"Most market participants are waiting to see what comes out of the debate tonight and will take their cue from there," said Richard Scalone, co-head of foreign exchange at TJM Brokerage in Chicago.The euro was last up 0.34 percent against the dollar at $1.13 after hitting an 11-day high of $1.1269 earlier. The dollar was last up 0.46 percent against the Turkish lira at $2.9797 liras in the wake of the Turkey credit downgrade after hitting a seven-week high against the lira in early trade of $2.9981.