Is September the worst month for stocks?
Yes, for the S&P 500. Since 1928, September has averaged -1.11% and finished higher in only 44% of 99 years, the weakest record of any month.
September also holds 7 of the index's monthly falls of 10% or more. The effect is well known and has been weaker in some decades, so treat it as a tilt.
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Not investment advice. Market Seasonality publishes historical statistics, news summaries and scenario analysis for information and education. Past patterns do not guarantee future results. Nothing here is a recommendation to buy, sell or hold any asset, and scenarios describe possible paths without predicting them. See the disclaimer and methodology.