September Is Bitcoin’s Worst Month and It’s Up 2.7% So Far. What That Says About Q4

Bitcoin is beating its worst month on the calendar, but the last time it pulled off this same trick it crashed 23% in the quarter that followed. Two factors in October will decide whether 2026 ends in profit or loss.

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Bitcoin (CRYPTO:BTC) has lost money in eight of the 13 Septembers since 2013, and its average monthly return is a loss of about 2.9%, the worst of any month on the calendar, according to CoinGlass. That record is why traders call September Bitcoin’s toughest month. This year, the Bitcoin price closed August at $78,563 and trades at $81,214 as of September 19, 2026, up about 3.4% so far this month.

The gain comes despite a turbulent few weeks, in which Bitcoin dipped to around $76,000 after the Senate voted down a motion to advance the CLARITY Act on September 15 and the Fed raised rates by 25 basis points on September 16. However, by September 18 it had rebounded above $81,000. So the question for Bitcoin holders heading into October is whether a September gain like this one points to a strong fourth quarter.

Has September Stopped Being Bitcoin’s Worst Month?