What Is The Weakest Month In The Stock Market?

Last Updated on November 22, 2022 by Oddmund Groette

Seasonal trends in the financial markets are many, and the stock market is no exception. Some months are better than others. What is the weakest month in the stock market?

The weakest month in the stock market is September. The second weakest month is June.

To find the weakest month, we backtested the S&P 500 back to 1960. The results are found in the table further below in the article:

What is the weakest month in the stock market?

We ranked the performance of all months since 1960. This is how we did it:

We buy at the close of the last month and we sell at the close of the current month.

The results for all months look like this:

What is the weakest month in the stock market?

The first column shows the result for each month.

Clearly, September is the weakest month in the stock market with an average negative return of 0.74%. June is the second weakest month – also negative with 0.15%.

Code for the weakest month in the stock market

We used Amibroker for our backtest. This is an easy program to learn and you can backtest individual stocks or a portfolio of stocks. If you find something that works and would like to trade live, you can easily use the same code for automated trading with a few modifications. Please read our Amibroker review.

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Seasonal trading strategies

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