Bitcoin Posts September Gains Despite Historical Monthly Losses and Macro Headwinds
Bitcoin rose over 3% in mid-September, extending a multi-year trend of positive returns for the calendar month despite regulatory setbacks and a Federal Reserve rate hike.
Bitcoin reached $81,214 on September 19, marking a roughly 3.4% gain from its August close of $78,563, according to CoinGlass data cited in the report. The cryptocurrency has historically struggled during September, recording losses in eight of the past 13 years with an average monthly decline of roughly 2.9%, largely driven by a five-year losing streak between 2017 and 2021.
The recent advance follows three consecutive years of positive September performance, with gains of 3.9% in 2023, 7.3% in 2024, and 5.2% in 2025. The piece notes that the historical 13-year sample remains limited, meaning single-year movements significantly alter the long-term monthly average.
The current month's performance withstood notable volatility mid-month. Bitcoin briefly slid toward $76,000 following a 49-50 Senate vote against advancing the CLARITY Act on September 15 and a 25-basis-point interest rate increase by the Federal Reserve on September 16. Spot Bitcoin ETFs saw single-day outflows of $450 million on September 15 before the price rebounded past $81,000 on September 18.
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