August turned out to be a surprisingly strong month for bitcoin: in two weeks, the asset compensated for three months of decline, rising by about 28% and surpassing the $80,000 mark. However, September poses a much more serious challenge to the market. The rhetoric of Federal Reserve Chairman Kevin Warsh at the Jackson Hole symposium dramatically changed the landscape: the probability of a rate hike at the September meeting jumped from 45% to 60% within just an hour after his speech.
This is the first time in 11 years that bitcoin closes August in positive territory after the U.S. midterm elections. But historical statistics are relentless: September is the second worst month for BTC, and this is no coincidence. Analysts attribute this to the "September effect" — the closing of the third quarter, fund tax payments, and portfolio rebalancing. Warsh only added to the uncertainty, stating that the labor market remains resilient (unemployment around 4.1%), corporate capital expenditures are growing by 9% annually (largely driven by AI), and PCE inflation holds at 3.7% against a 2% target. The regulator is clearly not confident in a steady move toward the goal.
A high rate makes U.S. Treasuries more attractive, strengthens the dollar, and forces investors to demand a higher risk premium from stocks and cryptocurrencies. Bitcoin, as one of the assets most sensitive to global dollar liquidity, finds itself at the epicenter of this pressure. At the time of writing this review, nearly 62% of market participants are pricing in a rate hike at the next meeting.
Key September dates
The first half of the month will be packed with macroeconomic releases: September 1 and 4 — labor market reports, September 10 — Producer Price Index (PPI), September 11 — the main consumer inflation report (CPI) for August. It is the CPI that will trigger the first significant move. Next comes the Fed meeting on September 16 with updated economic forecasts, and on September 18 — the Bank of Japan's decision, which could affect carry trades. But the real test will be September 25 — the expiration of the quarterly block of bitcoin options with open interest of around $12 billion. I consider this date decisive for determining the medium-term trend.
Levels to watch
The base scenario is consolidation in the range of $74,000–$75,000 (lower bound) and $80,000–$84,000 (upper). A rise to $100,000 in September is unlikely, but a sharp collapse should not be expected either. Inflows into spot ETFs will be a key indicator: $400–800 million over several sessions could send BTC to $74,000–$75,000, $800 million–$1.2 billion could restore the $80,000 level, and $1.5–2.5 billion could push toward $84,000–$85,000.
Before the CPI release on September 11, profit-taking after a strong August is likely, which could lead to a pullback to $75,000, $74,000, and even $72,000. If inflation comes in below expectations and ETFs do not show major outflows, bitcoin will quickly return to the $80,000–$84,000 range. Otherwise, the probability of a rate hike will rise to 70–80%, and losing the $74,000–$75,000 level will open the door to a correction into the $70,000–$72,000 zone.
The open interest structure for September 25 indicates that many traders are pricing in a drop to $70,000, which sets the stage for heightened volatility and false breakouts in the second half of the month. The historical average return for BTC in September is about −3%, but the last three years have seen the month close in positive territory, so relying solely on seasonality would be a mistake. My final outlook: movement in a wide range with a downward bias in the first half of the month and an attempt to return to $80,000–$84,000 in the second, provided inflation data does not worsen the picture.
My comment: The market is currently at a bifurcation point. The reaction to the CPI on September 11 and the subsequent options expiration on September 25 will set the tone for the rest of the year. Investors should be prepared for high volatility and not give in to emotions — key support and resistance levels are now clearly defined, and their breakout will provide a clearer signal than any verbal interventions.