charts: September Stock Markets

Courtesy of thepatternsite.com

Courtesy of thepatternsite.com

Possible Explanation By Investopedia
Since 1950, the month of September has seen an average decline in the Dow Jones Industrial Average (DJIA) of 1.1%, while the S&P 500 has averaged a 0.7% decline during September. Since the Nasdaq was first established in in 1971, its composite index has fallen an average of 1% during September trading. This is, of course, only an average exhibited over many years, and September is certainly not the worst month of stock-market trading every year.
There are several theories which attempt to explain this phenomenon. One particular theory points to the fact the summer months usually offer light trading volumes on the stock market, as a good deal of investors typically take vacation time and refrain from selling stocks from their portfolio. Once fall begins these investors typically return to work and exit positions they had been planning on selling. When this occurs, the market experiences increased selling pressure, and thus an overall decline.
*As well, many mutual funds experience their fiscal yearend in September. Mutual fund managers, on average, typically sell losing positions before year end, and this trend is another possible explanation for the market's poor performance during September.

Data from moneychimp.com

            Yrs  Yrs  Avg

Month  Up  Dn   Gain/Loss

Jan        39   26   +0.94%

Feb       37   28    -0.13%

Mar       42   23   +1.10%

Apr       44   21   +1.36%

May      37   28   +0.11%

Jun       33   32    -0.07%

Jul        35   30   +0.83%

Aug     37   28    -0.18%

Sep     29   36     -0.65%

Oct     40   25     +0.68%

Nov    43   22     +1.37%

Dec    49   16     +1.59%

The data above supports that September is the worst month of the year and that the best six months of the year is November to April.

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This has been posted for Educational Purposes Only.   Do your own work and consult with Professionals before making any investment decisions.  
Past performance is not indicative of future results