Pending home sales sank in August for the fifth time in six months, and slower activity in the areas hit hard by Hurricanes Harvey and Irma will likely pull existing sales for the year below the pace set in 2016, according to the National Association of Realtors.

The Pending Home Sales Index retreated 2.6 percent to 106.3 in August from 109.1 in July. The index is now at its lowest reading since January 2016 (106.1), is 2.6 percent below a year ago, and has fallen on an annual basis in four of the past five months.

Lawrence Yun, NAR chief economist, says this summer's terribly low supply levels have officially drained all of the housing market's momentum over the past year. "August was another month of declining contract activity because of the one-two punch of limited listings and home prices rising far above incomes," he said. "Demand continues to overwhelm supply in most of the country, and as a result, many would-be buyers from earlier in the year are still in the market for a home, while others have perhaps decided to temporarily postpone their search."