A review of decades of market data is alerting investors that the summer trading season is not simply a "downward period." Analysts at Bank of America point out that the months from August to October are more prone to a defensive market environment, where the US dollar, gold, and bonds may attract more capital than equities.
As August approaches, investors may need to heighten their vigilance, keeping an eye on market direction while preparing for potential volatility. In the latest seasonal research report, Bank of America Securities technical analyst Paul Ciana notes that historical data over the past several decades indicates the next three months could bring a more defensive investment climate for the US stock market.
Based on historical performance, the August-to-October period is typically the weakest three-month stretch for the S&P 500 Index on a rolling basis. During this same period, the US dollar, gold, and bonds have historically performed better. However, historical seasonality does not necessarily mean the US stock market will inevitably decline during the summer. The so-called "summer weakness" reflected in the market is more about differences in average returns rather than a bear market occurring every year.
Long-term statistics show that the average performance of US stocks from May to October is typically weaker than from November to April of the following year, though there are clear differences between individual months. For example, July has historically shown relatively stronger performance, while August is more often associated with increased volatility and rising market uncertainty. Since 1928, the August-to-October period has been the weakest three-month window for the S&P 500 in terms of average performance.
According to Ciana's report, during this phase, the S&P 500 has a probability of rising of only 55%, with an average return that is essentially flat at negative 0.02%. The average peak-to-trough decline reaches 7.35%, the largest among all rolling three-month cycles. This historical pattern continues the defensive strategy Bank of America Securities has adopted since the end of May.
However, not all stock indices experience the same degree of weakness in August. Historical data shows that the Dow Jones Industrial Average (DJI) is the most resilient among the major indices. The Dow has a 62% probability of rising in August, with an average gain of 0.86%. Market research generally attributes the tendency for weaker summer performance to changes in the trading environment. European and American investors tend to take more vacations in the summer, reducing market participation, and trading volumes typically decrease.
In conditions of lower liquidity, capital flows can amplify price volatility. Additionally, August usually falls after the peak of second-quarter earnings season and before the next round of earnings forecast adjustments. With a lack of fresh corporate earnings information, the market is more prone to trade around interest rates, inflation, and policy expectations. Ciana emphasizes that seasonal weakness does not equate to a weakening of the long-term trend.
Historical data indicates that corrections occurring in late summer often pave the way for a subsequent strong market period. The November-to-January period is typically a strong phase for the S&P 500, with an average historical gain of 3.54%. Therefore, the weakness from August to October is more a reflection of a phase of increased risk rather than a change in the underlying long-term investment thesis.
The US dollar has historically performed relatively strongly in August. The Bank of America Securities report shows that August is often a favorable period for the US dollar. Among developed market currencies, the dollar's performance against the British pound and the Australian dollar is particularly notable. Since 2000, the probability of the US dollar rising against the British pound in August is 65%, and against the Australian dollar, it is 69%.
This seasonal trend is more pronounced in the second year of the US presidential cycle, a phase we are currently in. Among emerging market currencies, the South African rand shows the weakest seasonal performance. Historical data indicates that the probability of the US dollar rising against the South African rand in August is 73%, with an average gain of 2.19%. Therefore, if the market shifts to a risk-off mode, the US dollar against the South African rand (USD/ZAR) becomes one of Bank of America Securities' preferred seasonal trading directions.
The report also notes that August typically sees a decline in government bond yields. The yield on the US 30-year Treasury bond often falls during August, especially in the second year of the US presidential cycle, with a decline observed in approximately three-quarters of historical observations and an average drop of 18 basis points. The yield on the Australian 10-year government bond shows a similar trend, historically declining in about 73% of August periods. Falling bond yields are typically associated with a more defensive investment environment, as investors tend to increase their allocation to relatively safe assets like government bonds.
Among major macro assets, gold is one of the more prominent defensive assets in the late summer period. The Bank of America report shows that since 1992, gold has had a 61% probability of rising during the August-to-October period, with an average gain of 2.52%. Historical performance shows that when the stock market weakens and US Treasury yields fall, gold often finds support. Consequently, Bank of America Securities views gold as an important seasonal asset for hedging against stock market volatility.
In an overall defensive market environment, the energy sector is a notable exception. The report shows that the Bloomberg Energy Index has historically averaged a gain of 2.42% in August, with even stronger performance in the second year of the US presidential cycle. Additionally, crude oil prices tend to strengthen in late August, which could provide extra support for energy-related investments. However, seasonal factors alone cannot determine market direction.
Historical data suggests that summer is more often characterized by weaker returns and increased volatility rather than a sustained decline. For long-term investors, summer does not necessarily mean they must reduce their equity holdings. The ultimate direction of the market will still depend on corporate earnings growth, interest rate policy, the economic cycle, and valuation levels. Ciana states that seasonality is just one reference indicator in investment decisions, but data from the past several decades suggests that the August market environment is more conducive to a defensive allocation. This means increasing attention on assets like the US dollar and gold while maintaining caution on stock risks until the market enters the historically stronger period from November to January.
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