CNBC's Jim Cramer on Friday walked investors through next week on Wall Street, highlighting new economic data and the expected unveiling of Apple 's latest iPhone. He also warned that September is usually a tough month for the market as a whole.

"As we head into the next week, keep in mind that we're stuck in the month of September, a historically terrible month for the market where bad news is bad news, and good news is fleeting," Cramer said. "It's not the end of the world, people, but it is an awful stretch of the calendar."

On Monday, Cramer will be paying attention to a quarterly report from Casey's General Stores . He said he likes the company's retail concept, adding that it holds a lucrative position in smaller U.S. towns. Cramer suggested he would buy some

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