The Thomson Reuters/University of Michigan final consumer sentiment index decreased to 91.9 in August from 93.1 in July, missing the preliminary estimate of 92.9.

The downward revision was driven by the recent turbulences on the markets.

"Overall, the data suggest that real personal consumption expenditures will expand by a still healthy 2.9% in 2015, with the pace of growth rising to 3.0% in 2016. Needless to say, consumer sentiment must be carefully monitored in the months ahead," the Surveys of Consumers chief economist at the University of Michigan Richard Curtin.

The current economic conditions index declined to 105.1 in August from 107.2 in July, down from a preliminary reading of 107.1.

The index of consumer expectations fell to 83.4 in August from 84.1 in July, down from a preliminary reading of 83.8.

The inflation expectations for the next year remained unchanged at 2.8% in August.