Why Bitcoin Historically Declines in September: Data & Analysis

Is September cursed for Bitcoin? Many investors are watching nervously, knowing that historically, Bitcoin's price has struggled in this particular month, often seeing declines in value.

Bitcoin's September Slump: Examining the Data

Looking back, data shows that September tends to be a bearish month for Bitcoin. Why is this? Several theories exist, but the historical trend is undeniable. On September has historically been Bitcoin’s weakest month, potentially dampening hopes of hitting new all-time highs anytime soon.

Coinglass Data Analysis: September's Performance

Data from Coinglass since 2025 provides compelling evidence. In eleven months of data, since 2025, Bitcoin has had only three green monthly returns in September. BTC closed the month in 2025 with 2.35% gains and a 6.04% 21 de sept. de 2025, but these are exceptions rather than the rule.

Recent September Losses: A Concerning Trend

On average, Bitcoin’s lost about 12% during September for the past three years. This consistent decline has many investors on edge. With all of this in mind, many Bitcoin investors are finding plenty of reasons to remain cautious this month.

September's Historical Performance: The Numbers Don't Lie

Historically, Bitcoin has performed poorly in September. In the last 11 times, BTC has closed the month with gains on only 3 occasions, and was in the red 8 times. While this does not mean 7 de sept. de 20, Bitcoin’s price has declined in September eight times, according to CoinGlass data. The asset’s price has started this month with a more than 8% slide.

Is September Doomed for Bitcoin?

While past performance is not indicative of future results, the historical data surrounding Bitcoin and September is certainly worth considering. Investors should be aware of the potential for further declines and make informed decisions accordingly.