Bitcoin posted six consecutive negative Septembers from 2017 through 2022, which is where the month's reputation comes from, but it has closed green in 2023, 2024, and 2025. SOPR and Mean Coin Age readings have been improving alongside spot and ETF demand. Forecasts remain split rather than converging: one set of model outputs spans a 1.37% gain to $79,674 against a 9.05% decline to $71,500, while Fundstrat's Tom Lee argues a pivotal September 15 Fed meeting could take Bitcoin to $150,000 after a short, sharp equity drawdown first.