The board's monthly index now stands at 80.3, down from 82.1 in June.
The index remains close to a five-year high despite the slight decrease and the Conference Board said the economy continues to improve.
Within the index, consumers remained robust on current conditions but expressed more concern about the future of the economy and job market.
While the housing recovery remains strong, pending home sales dipped in June as mortgage interest rates increased. The pain of the $80 billion federal budget sequester is also being felt in some quarters.