Bitcoin Faces 'Rektember' as Fed Hike Odds Rise to 66%

Bitcoin entered September down about 1% at just below $78,000, carrying a 25% August rally into the month the market calls “Rektember.” The seasonal label has statistical support, but this year it is paired with a more concrete headwind: derivatives markets priced a 66% probability that the Federal Reserve raises rates at its Sept. 16 meeting, according to CoinDesk’s reading of the CME FedWatch tool.

A weak month by the numbers

Since 2013, September has been bitcoin’s worst-performing month on average, producing a loss of around 3% and only five positive returns, CoinDesk reported. The seasonality is not confined to crypto — since 1975, September has been the only month in which the S&P 500 has generated a negative average return.

The recent track record offers a counterpoint: each of the past three Septembers delivered gains. After bitcoin’s strongest month since November 2024, analysts quoted by CoinDesk framed the setup as one where consolidation, if not correction, would be unsurprising.

The macro turn

The rate-hike repricing follows Fed Chair Kevin Warsh’s hawkish Jackson Hole speech on Aug. 28, in which he emphasized that there is “work to do” on inflation. The remarks contributed to a global bond sell-off: the US 10-year Treasury yield reached 4.784%, a new cycle high. Gold fell more than 2% on Sept. 1, and WTI crude oil climbed to $88 a barrel — its highest level since late July — as US strikes against Iran continued, per CoinDesk.

Rate futures now imply a 25-basis-point hike on Sept. 16 and another potential increase by year-end, which would take the federal funds target range to 4.00-4.25% by the close of 2026.

Higher rates, tighter conditions

The mechanism linking Fed policy to crypto is indirect but well understood: higher rates tighten financial conditions and support the dollar, both of which tend to weigh on risk assets. The August rally ran while markets still treated a hike as possible rather than probable; the September repricing removes part of that cushion.

What the data does not tell you

Seasonal averages are not forecasts — they are summaries of history, and the past three Septembers have all been positive. Nor is a 66% priced probability a decision: employment and inflation prints before Sept. 16 can move it quickly in either direction. Flow data cuts the other way, too: spot bitcoin ETFs just recorded their best month of 2026 in August, a source of demand that did not exist in most prior Septembers.

The takeaway

September is not a verdict on bitcoin’s fundamentals; it is a collision between record ETF demand and a hawkish policy repricing. Which force dominates is an open question that the Sept. 16 decision — and the data released before it — will help answer.