EXHIBIT 99.1

For Immediate Release

WSI Industries Reports Second Quarter Results

March 18, 2013—Minneapolis, MN—WSI Industries, Inc. (Nasdaq: WSCI) today reported sales for its fiscal 2013 second quarter ending February 24, 2013 of $7,178,000 versus the prior year amount of $7,021,000, or an increase of 2% over the prior year quarter. Year-to-date sales for the six months ended February 24, 2013 totaled $15,762,000, an increase of 21% versus $13,008,000 in the prior year. The Company reported net income of $56,000 or $.02 per diluted share for the fiscal 2013 second quarter which was down from the prior year quarter amount of $171,000 or $.06 per diluted share. Year-to-date income for the first two quarters rose with the Company reporting earnings of $487,000 or $.17 per diluted share versus $276,000 or $.10 per diluted share in the prior year which represented an increase of 77%.

Benjamin Rashleger, president and chief executive officer, commented: “Our fiscal 2013 second quarter results reflected a softening in our energy business that, in combination with the typical seasonality of our second quarter, led to a lower bottom line net income versus the prior year quarter. While our sales increased quarter over quarter, our earnings were negatively impacted mainly by our product mix, and the effect this mix had on our shop efficiency. From a year-to-date perspective, our net income is still up with our fiscal 2013 results at $.17 per diluted share versus the prior year of $.10 per diluted share.” Rashleger continued: “We expect our fiscal third and fourth quarters to show improvement over our second quarter, however, we anticipate the full year fiscal 2013 results will fall short of the fiscal 2012 figures. We are optimistic that over time we will see a rebound in our energy business and that it will remain a key part of our business portfolio.”

Rashleger elaborated: “We remain confident about the core of our business. Our powersports business continues to grow and also to provide new programs. We are in the process of purchasing multiple machines to support the growth in both existing and new programs. In addition, our aerospace business has increased in fiscal 2013 and as we pursue our AS9100 quality certification this year, we are hopeful that it will continue to expand. Our efforts at driving new business remain strong, and the level of open quotes for potential new programs and customers is excellent.” Rashleger concluded: “Our new 47,000 square foot manufacturing space addition is nearly complete and we have begun occupying and utilizing the added space. We view the new addition as an excellent market advantage as it will allow us to approach prospective customers with larger outsourcing needs with a readily available site. We believe we are well positioned to capitalize on further growth opportunities.”

The Company also announced today that its Board of Directors has declared a quarterly dividend of $.04 per share. The dividend will be payable April 16, 2013 to holders of record on April 2, 2013.

WSI Industries, Inc. is a leading contract manufacturer that specializes in the machining of complex, high-precision parts for a wide range of industries, including avionics and aerospace, energy, recreational vehicles, small engines, marine, bioscience and the defense markets.

For additional information:

Benjamin Rashleger (President & CEO) or Paul D. Sheely (CFO)

763-295-9202

WSI INDUSTRIES, INC.

CONSOLIDATED STATEMENT OF OPERATIONS         (Unaudited)

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CONDENSED BALANCE SHEETS      (Unaudited)

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