Full Breakdown
September Market Volatility: Historical Trends and Current Uncertainties
9/3/2025, 1:29:07 PM
Historical Context of September Market Performance
September has historically been the weakest month for U.S. stocks, with the S&P 500 averaging a return of -0.68% since 1950. This trend is underscored by the fact that the index has posted positive returns only 44% of the time during this month, the lowest rate for any calendar month. Recent data indicates that the average return in September has worsened, with a near -2% average over the last decade. Analysts suggest that various factors contribute to this trend, including fiscal year-end selling by fund managers and investor psychology, where a history of poor performance leads to heightened caution and potential selling.
Current Market Conditions
As September approaches, Wall Street's main indexes are at or near record highs, with the S&P 500 and Nasdaq having experienced consecutive monthly gains. However, the momentum appears to be slowing, particularly in the technology sector, which has seen valuations reach levels not seen since the dot-com bubble. Nearly 80% of companies reporting earnings have exceeded analysts' expectations, yet concerns about stretched valuations and potential corrections loom large.
Impact of Recent Legal Rulings on Trade Policy
Adding to the uncertainty, a recent federal appeals court ruling deemed most of President Donald Trump's tariffs illegal, although they will remain in place pending a Supreme Court appeal. This ruling has contributed to a decline of about 1% in Wall Street's main indexes and has raised questions about the future of trade policy and its implications for the market. Investors are now in a "wait-and-watch" mode, with concerns about how trade partners will react and the potential for tariff refunds that could exacerbate fiscal issues.
Criticism and Concerns
Market analysts express mixed feelings about the current environment. Some, like Jim Baird of Plante Moran Financial Advisors, emphasize the need for patience as the situation unfolds, while others, such as Lori Calvasina from RBC, note that corporate uncertainty around tariffs is likely to remain elevated. Concerns about the Federal Reserve's independence and the risk of stagflation are also prevalent, as rising bond yields and political instability add to the market's challenges.
Verbatim Quotes
- “Whether it's the level (of the tariffs) or the timing or now questions about their validity, we've just got to let it play out,” — Jim Baird, Chief Investment Officer, Plante Moran Financial Advisors
- “On a more intermediate term basis, we think corporate uncertainty around tariffs will remain elevated, though lower than late spring levels,” — Lori Calvasina, Head of U.S. Equity Strategy, RBC
- “the process might change, but the outcome on tariffs will largely stay the same.” — Ed Mill, Washington Policy Analyst, Raymond James
What's Next for Investors?
Looking ahead, investors are advised to remain cautious as September historically presents a volatile environment. The potential for a correction is heightened, especially given the current market dynamics and the looming uncertainties surrounding trade policies and Federal Reserve actions. Analysts suggest that while a pullback may be likely, it could also present buying opportunities for those prepared to act swiftly.
