“Dog-Days” Seasonals: How August Vacations Shape Stocks & Futures
Traders may be sipping cocktails, but Mr Market rarely sits still. Here’s what eight decades of data say about August performance when desks empty out across Wall Street and Europe.
Why August Is Different
With portfolio managers in the Hamptons and continental Europe virtually shut down, liquidity troughs and a risk-off bias tend to dominate the last full month of summer. Seasonality studies show lighter turnover, higher intraday whips, and a tendency for equities to lag just as volatility (VIX) perks up.
Equity Index Scorecard: Average August Returns
| Index (Study Period) | Avg Aug % Return | Rank vs. Other Months |
|---|---|---|
| S&P 500 (1950-2024) | -0.01 % | Bottom quartile |
| Dow Jones (1988-2020) | -0.8 % | Worst month |
| NASDAQ (1988-2020) | +0.2 % | Mid-pack |
The S&P 500’s near-zero average masks frequent drawdowns: over the last 15 years the index has slipped a median 0.56 % between 1 Aug and 11 Oct.
In post-election years (like 2025) August deteriorates further, with typical losses of 0.5 % – 1.5 % across the major U.S. indices.
Volatility follows suit: the VIX posts its largest average monthly gain
of 13.7 %, rising in two-thirds of cases.
Futures Market Hot-Spots
Crude Oil (WTI)
Energy bulls historically cash out by late summer. A Seasonax study shows WTI falling an average 7.85 % between 1 Jul and 22 Aug. The longer-term EquityClock profile highlights a lucrative “buy 24 Dec / sell 21 Aug” window; after that point prices tend to soften into autumn refinery maintenance.
Gold
Precious-metal traders often dub July–August the summer doldrums
. Since 2000, gold has shown a mean -2.3 % drawdown in August, offering a statistical entry before the September–October festival-driven rally.
Corn
Grain markets pivot from weather premium to harvest pressure. History shows corn futures enjoy a brief early-August bounce, then sell off into late September
; prices finish September lower than pre-Labor-Day levels 54 % of the time, with average losses of 25 ¢ in down years.
Practical Take-Aways for Traders & Investors
- Expect thinner books. Reduced depth amplifies headline risk and can exaggerate intra-day swings.
- Watch the calendar. U.S. Non-Farm Payrolls (first Friday), the mid-month options-expiration “OPEX”, and Jackson Hole (late August) often act as volatility catalysts.
- Volatility hedges pay. Historical VIX behaviour suggests building optionality or protective puts before the last week of July.
- Commodities rotate. Consider tightening stops on crude-long strategies by mid-August and scouting dip-buys in gold for an autumn run-up.
- Agriculture risk shifts. Weather premium fades; harvest-pressure shorts or option collars in corn/soy often gain edge after mid-August.
Key Dates on the August 2025 Radar
- 2 Aug – U.S. Payrolls
- 16 Aug – August OPEX
- 22 Aug – Historic WTI turning-point window
- 28-30 Aug – Jackson Hole Economic Symposium