The University of Michigan's preliminary August consumer sentiment index reading was 97.6, compared to the final July 93.4, and the preliminary July 93.1, according to market sources.
The expectations index was 89.0, compared to the final July 80.5, and the preliminary July 80.2.
The current conditions index was 111.0, compared to the final July 113.4, and the preliminary July 113.2.
Economists polled by Thomson Reuters had predicted a 94.0 reading for the main index, 81.0 for expectations and 113.3 for current conditions.
The five-year inflation expectation index was 2.5%, compared to 2.6% in July, while the one-year inflation expectation index was 2.6%, compared to 2.6% in July.
The University of Michigan index is not released to the press, but only to paying subscribers.