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Historical September Seasonal Drag Affects Bitcoin and Traditional Equities

Historical trading patterns show Bitcoin and broader equity indexes frequently facing downside pressure during the month of September.

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Historical performance data shows that Bitcoin has finished in negative territory in eight of the past 13 Septembers, posting an average decline of 2.97% and making it the asset's weakest month on average. The seasonal weakness mirrors patterns in traditional equities, where the S&P 500 has averaged September losses going back decades. Although September 2025 bucked the trend with a 5.16% gain, market participants enter September 2026 with Bitcoin trading near $77,500 following a nearly 25% advance in August, while navigating potential Federal Reserve interest rate moves and election-year dynamics.

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