markets9 min read
📉
September Really Is the Stock Market's Worst Month — Here's What 75 Years of Data Actually Shows
The S&P 500 has averaged a -0.6% return in September since 1950, with more losing years than winning ones. Here's what that statistic does and doesn't mean for what you should do with your portfolio this month.
SmartRates Editorial Team
August 30, 2026