Why September Seasonality Spells More S&P 500 Volatility

Why September Seasonality Spells More S&P 500 Volatility Interest rates are getting the blame for rising volatility – but September is the S&P 500's worst month on average. Here's what seasonality says comes next… Written by Larry Benedict Published on Sep 3, 2026 Rising interest rates around the world are being blamed for a jump in stock market volatility. Just two weeks after Treasury Secretary Scott Bessent announced measures to stem a jump in long-dated bond yields, rates are increasing once again. The 10-year Treasury yield just hit 4.8% – the highest level since 2023. It’s not much better on the short end either. Following a highly anticipated speech at the Federal Reserve’s Jackson Hole Symposium, Fed Chair Kevin Warsh kept up the hawkish rhetoric against inflation. Odds for a rate hike at the Fed’s next meeting in a few weeks spiked in response. While many are blaming the jump in rates across the yield curve for the pullback in stock indexes, that’s not the full story. Here’s what the calendar says about stock market trends, and what investors can expect next… (If you enjoy this e-letter, I’d be very grateful if you recommended it to a friend. You can click here to forward it. Thank you!)

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What Is Stock Market Seasonality? Seasonality refers to the stock market’s tendency to rise or fall over certain parts of the calendar year. For example, you’ve probably heard the phrase, “Sell in May and go away.” That refers to the S&P 500’s historical tendency to have a difficult six-month stretch from May through October. On the other side, the six months from November to April are often bullish when you look back historically. That’s a big-picture way of using seasonality. Yet traders can narrow their focus to track seasonality over specific months or other shorter-term trends as well. The chart below shows how the S&P 500 has performed on average throughout the year for the past 20 years. The vertical line shows where we are today. Notice that seasonal tendencies also unfold over shorter time frames. Following a strong start to August, the S&P 500 has been drifting slightly lower, which is in line with seasonal trends. But don’t expect the rangebound, low-volatility environment to last long. That’s because weak seasonality is arriving right on cue – with an extra element of uncertainty over the coming months… Tune in to Trading With Larry Live Each week, Market Wizard Larry Benedict goes live to share his thoughts on what’s impacting the markets. Whether you’re a novice or expert trader, you won’t want to miss Larry’s insights and analysis. Even better, it’s free to watch. Visit us on YouTube to catch the latest! Why September Is the S&P 500’s Worst Month The month of September is hands-down the worst month of the year for the S&P 500 on average. And it isn’t even close. The chart below shows average returns by month for the S&P 500 going back 60 years: Historically, September has delivered an average return of -0.70% for the month. That’s the worst average return and the only negative month. It also has the worst “hit rate.” That refers to the percentage of time that the S&P 500 generates a positive return for the month, which stands at just 46% for September. And here’s another thing to note about September. When you string together weekly returns during the year, the last two weeks of September are the worst stretch historically. Not only that, but the coming midterms this year add another complicating factor, as seasonal weakness is also common heading into elections. So while interest rates may play a role in the recent downside in the S&P 500, it’s certainly not the only factor to consider. And if the S&P 500 keeps reflecting historical trends, then investors should be prepared for more volatility in the coming weeks… Happy Trading, Larry Benedict Editor, Trading With Larry Benedict Get Instant Trade Alerts on Mobile! Click the icon below from your mobile device to download The Opportunistic Trader app today for one-tap access to trade alerts, issues, and model portfolios for all of Larry’s services. Available in the app store on Android and iPhone. More stories like this Read the latest analysis on hot growth stocks, and market-moving developments Why the 10-Year Treasury Yield Matters More Than the Fed Everyone's watching the Fed's September rate decision. But another rate – the 10-year Treasury yield – could matter far more for stocks… Sep 2, 2026 • 3 min read The VIX Just Hit a 2026 Low – and That’s a Warning The VIX just fell to a 2026 low while the S&P sits a hair below its record high. Here’s why a "too quiet" market makes trading harder… Sep 1, 2026 • 3 min read Why Commodities Signal Inflation Is About to Get Worse Energy, metals, and agriculture are rallying at once. Here's why commodities are signaling that U.S. inflation is about to take a turn for the worse… Aug 31, 2026 • 3 min read 1125 N Charles St, Baltimore, MD 21201 www.opportunistictrader.com To ensure our emails continue reaching your inbox, please add our email address to your address book. This editorial email containing advertisements was sent to reunisoft.cryptonews@blogger.com because you subscribed to this service. To stop receiving these emails, click here. The Opportunistic Trader welcomes your feedback and questions. But please note: The law prohibits us from giving personalized advice. To contact Customer Service, call toll free Domestic/International: 1-888-208-6550, Mon–Fri, 9am–5pm ET, or email us here. © 2026 Omnia Research, LLC. All rights reserved. Any reproduction, copying, or redistribution of our content, in whole or in part, is prohibited without written permission from Omnia Research, LLC. Privacy Policy | Terms of Use