Memorial Day weekend (May 23-25, 2026) has become the unofficial start of summer for many Americans, marking a notable transition in financial markets. In recent years, trading activity typically begins a gradual decline shortly afterward—barring major external events—toward a later summer low.
Over the past 20 years, the Thursday before Memorial Day has delivered the strongest average gains across major indices (DJIA +0.07%, S&P 500 +0.18%, NASDAQ +0.34%, Russell 2000 +0.32%). Friday shows a solid percentage of up days—particularly for the NASDAQ (66.7%, +0.38% average)—but with more mixed overall performance. Wednesday is the weakest, with negative average returns. The dataset includes 2025; both median returns and win rates also tend to favor Thursday in several cases.
Market participants refer to this summertime slowdown as the summer doldrums, characterized by anemic volume and often uninspired, range-bound trading on Wall Street. Seasonal volume patterns since the 1960s for the NYSE and 1970s for the NASDAQ show this typical lull, with daily trading volumes frequently dropping 20-40% from winter peaks, reaching troughs particularly in late July and August as vacations reduce institutional participation.
In the lead-up to the holiday, historical performance presents mixed yet distinctive results. Thursday before Memorial Day has consistently delivered the strongest average gains across the DJIA, S&P 500, and Russell 2000 in 21-year analyses. Friday, the last trading day before the long weekend, records a higher proportion of advancing sessions for most major indexes, with the NASDAQ standing out at a 66.7% win rate, an average gain of 0.38%, and nine up closes in the last ten years. That said, this Friday session also tends to feature lackluster, light-volume trading. For the DJIA, results have been essentially neutral over extended periods, with an even split of up and down closes and a modest average decline of approximately 0.05%.
Following the holiday, market behavior often turns more muted and, in recent decades, weaker. The Tuesday after Memorial Day has shown notable softness, with the DJIA and S&P 500 declining in seven of the last nine observed years, alongside more frequent losses in the NASDAQ and Russell 2000. Broader post-holiday windows, including the full trading week after Memorial Day, performed robustly from the early 1970s through the mid-1990s but have since weakened considerably, with reduced frequency of positive returns and smaller average gains, especially since the late 1990s and after 2010. An event study of returns spanning three days before to three days after the holiday generally aligns with long-term daily averages, showing no pronounced anomaly.
Beyond the immediate sessions, the broader period from Memorial Day to Labor Day (September 7, 2026) has historically produced net positive, albeit modest, results for the S&P 500. The index has advanced in roughly 70% of periods since the early 1970s, with average gains typically ranging from 1.6% to 2.8%. This summer window fits within the broader “Sell in May and Go Away” tendency, during which overall returns tend to be softer than in the November-to-April period, even as the Memorial Day-to-Labor Day segment itself often contributes positively amid the lighter volumes of the doldrums.
In midterm-election years such as 2026, these summer patterns can intersect with the broader presidential cycle, which historically features heightened volatility and often subdued returns. Midterm years frequently see notable market lows forming between late July and mid-August, aligning with the depth of the summer doldrums, reduced liquidity, and pre-election political uncertainty. Such periods have at times served as bottoming phases, setting the stage for stronger recoveries later in the year or into the following pre-election period, though outcomes vary with prevailing economic and geopolitical conditions.
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