Matson Navigation Co. is lowering its fuel surcharge by 3.75 percentage points, to 21.75 percent from 25.5 percent, effective Sept. 12 for its mainland-Hawaii service.

The state’s largest ocean shipper said the decrease represents a reduction in shipping costs ranging from $100 to $150 per container.

It is the second consecutive decrease for the state’s largest ocean shipper and comes on the heels of a 2 percentage-point decrease to 25.5 percent on July 18.

Matson also said it is lowering its fuel surcharge for its Guam/Commonwealth of the Northern Mariana Islands and Micronesia service by 3.75 percentage points, to 23.25 percent from 27 percent, on Sept. 12.