Stocks often drop in September — but many investors shouldn’t care

Historically, September is a weak month for U.S. stocks, with an average decline of 0.9% since 1926. The trend is thought to be tied to seasonal economic factors and investor psychology, rather than concrete market conditions. However, long-term investors are advised not to panic and sell during September, as market timing is notoriously unreliable. Data shows that stocks can perform well even in September, highlighting the randomness of market movements.