September is resisting its old pattern

Bitcoin was up about 7% for September on September 29, following an approximately 25% advance in August, according to CoinDesk’s market report. With the month still open, the cryptocurrency was on course for three consecutive monthly gains.

A positive finish would also break a pattern in the data going back to 2013: previous positive Augusts had been followed by negative Septembers. It is a notable historical comparison, but the result cannot be final until the month closes.

Higher bond yields create a competing force

The advance has held up alongside a difficult interest-rate backdrop. CoinDesk reported the US 10-year Treasury yield above 5.2%, while oil remained above $90 a barrel.

Higher yields can make interest-bearing assets more attractive relative to holdings that do not generate an income. Expensive energy can also complicate the inflation outlook, making expectations for monetary policy harder to settle.

A strong month can contain weak sessions

The broader gain does not mean every recent trading session has been positive. MarketWatch reported that the iShares Bitcoin Trust was heading for a sixth consecutive decline on September 29, even while retaining a gain for the month.

That difference between the short-term move and the monthly result helps explain the mixed mood. Investors can recognise a substantial recovery while still becoming more cautious about its next stage.

Seasonality is context, not a forecast

October has historically been a stronger month for Bitcoin, but averages cannot account for the specific conditions facing the market this year. A changing interest-rate outlook can overwhelm a familiar calendar pattern.

The immediate milestone is the September close. Beyond that, sustained demand and the direction of yields will matter more than the assumption that a strong month must be followed by another.