The National Weather Service says overall Portland saw more than six inches during the month -- which is the most ever recorded since record keeping began in 1872.
on Sunday, the Portland Airport was already breaking the record.
Meteorologist Steve Pierce is with the American Meteorological Society.
"This is a significant and for some places historical record. The Portland Airport has 4.38 inches in September as of Sunday and that passes the previous record of 4.30 inches set back in 1986."
The Portland Airport went on to get more than five inches for September.
Astoria set a record by getting more than ten inches during the month.