The barometer of current economic conditions decreased to 105.1 from a preliminary 107.1 and a July final of 107.2.
The gauge of consumer expectations declined further to 83.4 from a preliminary 83.8 and a final 84.1 in the previous month. It is the lowest figure since November.
Americans expect the inflation rate in the next year to be 2.8 percent, unchanged from the preliminary and the previous reading. Over the next 5 to 10 years, they expect consumer prices to rise 2.7 percent, compared with a preliminary reading of 2.7 percent and a final figure of 2.8 percent in July.