The dollar index, which measures the greenback against a basket of currencies, added 0.05% to 98.17. While the yen weakened to a two-month low against the dollar.
The yen lost 0.2% to 150.59 per dollar and earlier touched 150.62, the weakest level since August 1.
Japan's currency also skidded to 176.35 per euro.
The euro was little changed at $1.1705.
The euro slid against the dollar and the pound in the previous session after France's new Prime Minister Sebastien Lecornu and his government resigned on Monday.
