Historically, this is the month that the three main averages of the stock market usually perform the poorest. It doesn’t have to happen, but my advice would be to tread carefully in September.
The “September Effect” is a market anomaly worldwide. It is unrelated to any event or news. The Dow Jones Industrial Average as well as the S&P 500 Index have averaged a decline of 0.8% and 0.5% respectively since 1950 during this month. In the period from 1928 through 2021, the benchmark S&P had an even worse record, down 1% on average.
The only reasonable explanation might be that investors tend to cash in on gains made throughout the sleepy summer, but that’s just a guess. As for the historical track record, I pay attention, although I need more reasons than seasonality to make me wary.
In any event, stocks regained quite a bit of the August 5.5% sell-off by the end of the month. I was expecting a bounce and I got it. Quarterly corporate earnings helped somewhat. On average, earnings came in better than expected.
Volume has been extremely light throughout the month since most of the financial community was on vacation. Only skeleton staff manned the trading desks and that allowed traders to push the averages higher on fewer and fewer stocks.
The economic data this week also helped support the markets. Remember that bad economic news is good for the stock market right now. The weaker the data the higher the chance that the Fed will pause or even cease raising interest rates.
The second quarter Gross Domestic Product was revised downward by 0.3% to 2.1%.
The Fed’s key inflation indicator, the Personal Consumer Expenditure Index (PCE) came in as expected with a gain of 0.2%, which was no change versus last month.
On the jobs front, both the Jobs Openings and Labor Turnover Survey (JOLTS) and ADP National Employment Report data indicated that new job creation slowed substantially last month. Both data points are considered a leading indicator of the labor market. A recent non-farm payroll revealed that the economy only added 187,000 new jobs and the unemployment rate rose to 3.8%. Bad news for labor but good news for the Fed which wanted to see employment gains slow.
On another subject, the marijuana industry had a good week. Many pot stocks saw gains of between 30-50%. Several marijuana exchange-traded funds also spiked higher. Why?
The Health and Human Services, after reviewing the present status of marijuana in the U.S. at the behest of the Biden Administration, recommended to the Drug Enforcement Agency (DEA) that the classification of marijuana be changed from a Schedule 1 controlled substance to a Schedule III drug. What’s the difference?
A Schedule I drug is considered one “with no currently accepted use and a high potential for abuse.” A Schedule III substance has “moderate to low potential for physical and psychological dependence.” If the DEA were to re-classify marijuana, it would then be considered a drug like ketamine, anabolic steroids, and testosterone, which are all Schedule III drugs. The difference in schedules could provide a large boost in sales, cash flow, and profits for American-based pot purveyors. My advice is to hold back if you have an itch to play this sector.
All the stocks are up a huge amount and will likely be subject to profit-taking shortly.
The week before Labor Day weekend is usually up. Check that one off the list. The risk going forward during the next few weeks is that we pull back to re-test the lows made on the S&P 500 Index in mid-August. From a technical point of view, that would be perfectly normal. But, if we break that level (roughly 4,432 or -5.5% from here), then we could go even lower,
How much lower? A rough guess would be down to the 4,200 level give or take.
Bill Schmick is a founding partner of Onota Partners Inc. in the Berkshires. None of his commentary is or should be considered investment advice. Email him at bill@-schmicksretiredinvestor.com.



Joel Blumert, right, followed by Trish Walter, of Collinsville, and Linda Huebner of Halifax, Vt., climb the ridge leading to the summit of Bear Mountain on New Year’s Day. Photo by Steve Barlow
The Mountaineer cheer squad amps up team spirit in front of a pink-themed student section during rivalry night against Lakeview High School on Feb. 5. Photo by Riley Klein
The baseball dugout had a good time heckling former Mountaineers during the HVRHS varsity vs. alumni baseball game in May.Photo by Riley Klein
The varsity lacrosse team poses with the runner-up trophy following the Western Connecticut Lacrosse Conference championship game against Watertown High School.Photo by Riley Klein
Anthony Labbadia set a new HVRHS record with a 44-foot one-inch triple jump June 14. The distance earned him 9th place at the New England track and field championship, which this year was held in New Britain, Conn. Photo by Riley Klein
Georgie Clayton, left, celebrates with Ava Segalla after a goal in the 2025 season.Photo by Riley Klein
Captain Gustavo Portillo celebrates with his teammates after a goal in soccer.Photo by Riley Klein
Gilbert/Northwestern/Housatonic football captain Wes Allyn, left, and QB Trevor Campbell after the end of the 2025 season.Photo by Riley Klein
Housatonic Valley Regional High School’s girls basketball team. From left, Autumn McKone, Olivia Simonds, Keely Malone, Selena Black, Hayden Bachman, Olivia Brooks, Maddy Johnson, Victoria Brooks, Carmela Egan, Aubrey Funk, Grace Graney and Noell Laurry. (Not pictured: Mya Weed) Riley Klein 
Sharon’s Mudge Pond spans more than 200 acres. Alec Linden
Citizen scientists look skyward for Audubon’s Christmas Bird Count Photo: Cheri Johnson/Sharon Audubon Center. 





September not kind to investors