Is September really the worst month in the stock market?

Many investors will point to September as a difficult time for the stock market, but is it just an opportunity in disguise? Let’s take a look at the data.

| More on:

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

Frustrated young white male looking disconsolate while sat on his sofa holding a beer

Image source: Getty Images

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Ah, September. The month that strikes fear into the hearts of even the most stoic investors. Many will know the adage: “Sell in May and go away, don’t come back till St. Leger Day.” But is there any truth to September’s reputation as the stock market’s bogey month? Let’s dive into the data.

The September effect

First things first, let’s look at the cold, hard facts. According to the data, September does indeed have a rather poor track record. Over the past 20 years, September ranks as one of the worst-performing months. The FTSE 100 has typically fallen by over 1.1% for the month, and the S&P 500 shows September as the only consistently negative month. Even the tech-heavy NASDAQ 100 can’t escape September’s curse, with it being one of the worst months over the past two decades for that index.

Interestingly enough, only five S&P 500 companies posted an average gain in September in the last five years. These all sit within the financial sector, with the best performer, PNC Financial Services (NYSE:PNC), returning an average of 1.2% in the same time period. With its highly diversified operation, it’s no surprise to see the company perform well throughout the year, with a healthy 54% rise in the last year alone.

The firm pays a decent dividend of 3.54%, backed up by solid cash flows, and a payout ratio of 52%, suggesting this could rise further if profits allow. A discounted cash flow (DCF) calculation suggests it’s still about 37% below fair value too. Despite annual earnings of 12% forecast over the next five years, I wouldn’t call this a sure thing. There has been plenty of insider selling in the last three months. Although this can be unrelated to performance, it’s not exactly inspiring to see over $2.5m sold by senior management.

A silver lining

While the general data might seem gloomy at first glance, there’s a flip side that long-term investors should consider. If September tends to see market dips, isn’t this precisely the time when we should be looking for bargains? Warren Buffett famously said, “Be fearful when others are greedy and greedy when others are fearful”.

For those of us diligently investing each month, September offers a chance to buy more with the same amount of money. Remember, we’re investing for years, not months. A single poor month matters little in the grand scheme of a decades-long investing journey.

An autumnal opportunity

So, is September really the worst month in the stock market? Statistically speaking, it has indeed been a weak performer. But for investors with a long-term mindset, I’d say it presents an opportunity rather than a threat.

Instead of fleeing the market, consider these Foolish strategies: keep calm and carry on investing by sticking to a regular investment plan. Use any September weakness to snap up quality companies at a discount. Focus on fundamentals, as a company’s long-term prospects matter more than short-term market jitters. Embrace volatility and remember that market fluctuations are the price paid for superior long-term returns.

So while September might give us a bumpy ride, it’s just one month out of many. By keeping a cool head and focusing on the long game, investors can turn September’s reputation as the worst month into an opportunity for building lasting wealth.

Gordon Best has no position in any of the shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Group of young friends toasting each other with beers in a pub
Investing Articles

FTSE 100 shares: has a once-a-decade chance to build wealth ended?

The FTSE 100 index has had a strong 2025. But that doesn't mean there might not still be some bargain…

Read more »

Passive income text with pin graph chart on business table
Investing Articles

I asked ChatGPT for its top passive income ideas for 2026 and it said…

Stephen Wright is looking for passive income ideas for 2026. But can asking artificial intelligence for insights offer anything valuable?

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Here’s how a 10-share SIPP could combine both growth and income opportunities!

Juggling the prospects of growth and dividend income within one SIPP can take some effort. Our writer shares his thoughts…

Read more »

Tabletop model of a bear sat on desk in front of monitors showing stock charts
Investing Articles

The stock market might crash in 2026. Here’s why I’m not worried

When Michael Burry forecasts a crash, the stock market takes notice. But do long-term investors actually need to worry about…

Read more »

Person holding magnifying glass over important document, reading the small print
Investing Articles

Is this FTSE 250 retailer set for a dramatic recovery in 2026?

FTSE 250 retailer WH Smith is moving on from the accounting issues that have weighed on it in 2025. But…

Read more »

Young Black woman using a debit card at an ATM to withdraw money
Investing Articles

I’m racing to buy dirt cheap income stocks before it’s too late

Income stocks are set to have a terrific year in 2026 with multiple tailwinds supporting dividend growth. Here's what Zaven…

Read more »

ISA Individual Savings Account
Investing Articles

Aiming for a £1k passive income? Here’s how much you’d need in an ISA

Mark Hartley does the maths to calculate how much an investor would need in an ISA when aiming for a…

Read more »

Two business people sitting at cafe working on new project using laptop. Young businesswoman taking notes and businessman working on laptop computer.
Investing Articles

Is investing £5,000 enough to earn a £1,000 second income?

Want to start earning a second income in the stock market? Zaven Boyrazian breaks down how investors can aim to…

Read more »