September's growth was much stronger than the 1.1 per cent gain that economists had estimated.
Statistics Canada says the improvement from August was due to higher sales in the transportation equipment industry.
It adds the primary metal and food industries also posted sales gains.
Statistics Canada says it was the eighth gain in nine months, and comes after a 3.5 per cent decline in August.
It says sales in constant dollars increased 2.3 per cent, indicating that a higher volume of products was sold.