September in markets is a bit like a Monday morning; no one looks forward to it, and it usually lives up to its reputation.

August gave investors plenty to cheer about, but history says September tends to be the worst month of the year for stocks.

The S&P 500

hit a fresh record high at the end of August, topping 6,500, while the Dow Jones

also touched new peaks. Across the Atlantic, the Stoxx Europe 600