The University of Michigan released its consumer sentiment survey for August, showing an unexpected drop to 95.3 from 97.9 in July, while analysts estimated 98.1.
As of 02:01 GMT, the dollar index fell 0.34% against an array of major rivals to 96.32, with a session-low at 96.27, and a high at 96.66.
The current conditions gauge in the same survey fell to 107.8 from 114.4, while economic outlook steadied at 87.3.
One-year inflation expectations steadied at 2.9%, while five-year expectations rose to 2.5% from 2.4%.