DETROIT (

TheStreet

) -- September auto sales will likely show improvement from a year earlier but deterioration from last month, a new report indicates.

Edmunds.com is predicting new car sales of 936,900 units, a 28% increase from September 2009 but a 5.5% decrease from last month. It said September's seasonally adjusted annualized rate will be 11.47 million vehicles, up slightly from 11.44 million in August, while the retail SAAR will remain constant at 9.4 million.

"Despite some noteworthy new car introductions, auto sales are stagnant right now," said Edmunds.com analyst Jessica Caldwell in a prepared statement. "Automakers seem to have accepted the current sales rate; most seem reluctant to invigorate the market through traditional incentives programs or unload significant levels of inventory as fleet sales."

By comparison to August,

Ford

(F) - Get Report

sales will likely dip 2.6% in September, the smallest decline, while

Nissan

sales are falling 9.5%, the largest decline, Edmunds.com said.

General Motors

sales, reflecting fewer brands, will drop 7.1% while

Toyota

(TM) - Get Report

sales are falling 3.8%, the firm said.

Comparisons to September 2009 are not considered to be meaningful because it was a month when a

severe sales decline followed the completion of the Cash for Clunkers program.

-- Written by Ted Reed in Charlotte, N.C.

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Ted Reed