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November Had the S&P 500's Best Average Return From 1950 Through 2025
The index’s average November gain was 1.9%, while September had the weakest average, a 0.6% decline.

From 1950 through 2025, the S&P 500 recorded its largest monthly average gain in November, at 1.9%, while September marked the weakest month in the historical comparison.
The average September return was a loss of 0.6%. Most months showed positive long-term average returns, and performance was generally stronger near year-end. The November-December period also showed an advantage in both average and median returns.
These figures describe past market behavior; they do not determine how the index will perform in a future November.