Amid persistent inflation, investors have been nervously eyeing how consumer spending pans out during the crucial holiday season, when retailers make more than a third of their annual profits.
The world's largest retailer by sales forecast holiday quarter U.S. same-store sales, excluding fuel, to increase about 3%, below estimates of a 3.4% increase.
The company's comments follow those of FedEx and Amazon, which have also warned of muted holiday season demand in recent weeks.
Home improvement chain Home Depot (HD.N) on Tuesday left its annual forecasts unchanged, adding to holiday season concerns amid a slowing housing market.
read moreFor the full-year, Walmart forecast net sales to rise 5.5%, above its previous forecast of a 4.5% increase.