Toyota says its August U.S. sales fell 13 percent because of supply shortages caused by the earthquake and tsunami in Japan.
The Japanese automaker has struggled to stock its dealerships with enough vehicles in the months since the disaster, which struck in March.
Toyota's sales totaled 129,483 cars and trucks last month, down from 148,388 a year earlier.
Sales of its popular Prius hybrid fell 20 percent, while Corolla sales dropped 19 percent.
Camry sales declined nearly 2 percent. New versions of the Camry go on sale next month.
Toyota says its supply situation continues to improve and North American production is expected to return to 100 percent this month.