Costco Wholesale Corp
The mean estimate of analysts polled by Thomson Reuters was for a drop of 6.4 percent in comparable sales for the month, including fuel.
Excluding the impact of fuel and foreign exchange, the company saw same-store sales, or sales at stores open at least a year, rise 1 percent.
The No.1 U.S. warehouse club said total sales for the month fell 5 percent to $5.47 billion.
Costco said last week quarterly net profit slumped 29 percent as shoppers cut back on purchases of non-essential items like clothes and jewelry.
Shares of the company closed at $48.47 Wednesday on Nasdaq.
(Reporting by Nivedita Bhattacharjee in Bangalore; Editing by Anne Pallivathuckal)