REUTERS/Robert Galbraith
Economists polled by Bloomberg are looking for the 20-city index to rise 0.65% on the month, compared with a 0.62% rise in July.
Meanwhile, on the year, home prices are expected to rise 12.5%, compared with a 12.39% rise in July.
Analysts have warned for some time that the pace of home price growth is unsustainable and would slow.