The S&P 500 sits near record highs after a strong start to 2026, but Motley Fool analyst Micah Zimmerman expects a pullback this August. History backs the caution: August ranks among the market's weakest months, yet the same data shows past corrections have rarely turned into lasting damage.
The S&P 500 slipped 0.2% to 7,723.55 on August 6, giving back 12.97 points. Zimmerman expects the index to pull back further this month, though he says the damage should stay uncomfortable rather than catastrophic — more a pause in the uptrend than the start of a lasting bear market.
August's seasonal soft spot
A study of monthly returns dating back to 1950 found the S&P 500's average August gain rounds to basically zero, with August and September standing out as the weakest pair on the calendar. Looking at the last three decades, another analysis found the index has declined by an average of about 0.5% in August and about 0.7% in September.
Zimmerman notes it isn't surprising to see strategists warn about a pullback when stretched sentiment and a long run higher collide with a historically weak window. Still, he stresses that doesn't mean a crash — only higher odds of a choppy month than usual.
How deep past August corrections have run
Bank of America analysts' seasonality work shows the August-through-October window has been the worst three-month stretch of the year on average since 1928, but even in down years, the typical correction has run around 7%. That is uncomfortable, yet within the range of a normal bull-market pullback.
Zoom out further, and a study of intra-year drawdowns since 1980 found that in more than half of calendar years the S&P 500 has suffered a double-digit decline at some point, with the average maximum drop around 13% — even in years that ultimately finished positive.
A midterm year adds another wrinkle
August 2026 also falls in a U.S. midterm election year, which carries its own pattern. Since 1950, the S&P 500 has suffered an average peak-to-trough decline of about 18% in midterm years, and research from Carson suggests those corrections have, on average, bottomed in August. That doesn't guarantee this month marks the low, but it explains why midterm summers carry a reputation for being statistically fragile.
At the same time, historical work on presidential cycles shows returns around midterms tend to be weaker and more volatile, while the year after a midterm election has frequently been strong as policy clarity returns and investors refocus on fundamentals.
Positioning matters more than timing
To Zimmerman, the most useful way to treat an August pullback prediction is as a stress test for an existing portfolio, not a trading signal. He suggests checking allocations before volatility hits, avoiding over-exposure to sectors that led the rally, and lining up a watch list of quality stocks to buy if prices reset.
Source: The Motley Fool
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