September Is Bitcoin's Worst Month But BTC Is Up 7.8% So Far. What Does This Mean for Q4?

Bitcoin is beating its historically worst month, but the real question is whether that momentum can survive what comes next. Two specific conditions will determine if Q4 turns into a repeat of 2024's 48% surge or a collapse like 2025's…

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September is historically Bitcoin’s worst month, yet this year it has defied expectations with a 7.8% increase so far. After a remarkable 25% gain in August, many are wondering what this trend could mean for the fourth quarter.

Looking at past data from CoinGlass, Bitcoin (CRYPTO:BTC) has lost value in eight out of the 13 Septembers since 2013, with an average loss of about 2.9%. This month, however, has taken a different turn. Bitcoin ended August at $78,563 and is trading at $84,702 as of September 21, 2026—a rise of 8.2% for the week, 7.8% this month, and 10% over the past 30 days.

This impressive rise occurred despite setbacks. Bitcoin dropped to around $76,000 after the Senate halted the CLARITY Act on September 15 and the Federal Reserve raised interest rates on September 16. Nevertheless, it rebounded sharply, surging 11% over the next five days. So what does a positive September suggest about Q4?