Here are two more short sale recommendations for this bearish month. : The S&P 500 is likely to close this month at a lower price than that of the August 31 close. The month has been bearish historically, especially so in Septembers ending in zero and in election years. Below, we see the average price change in options expiration week (OPEX) in the average month of September from 1985. This may be a guide to the coming week.