The manufacturing purchasing managers' index, or PMI, fell to 53.5 in September from 56 in August.

The latest index reading was the lowest level since February. Economists had forecast a score of 54.5. A PMI reading above 50 suggests growth in the manufacturing sector. Growth in both production and new orders eased in September.

Suppliers' delivery time lengthened. On the price front, input price inflation and output prices increased in September.