September Forex Outlook: Navigating Fed Policy Shifts and Dollar Volatility

As September opens, a heavy G10 policy calendar and renewed scrutiny of US fiscal credibility have put the dollar back under pressure, with Convera's monthly currency outlook pointing to the Treasury's expanded long-dated bond buyback program as the key catalyst reviving FX volatility after a largely muted August. The combination of softer US data, reduced expectations of further Federal Reserve tightening, and questions about long-term debt sustainability shifted sentiment toward risk-on, lifting equities to fresh highs, keeping carry trades well-bid, and allowing higher-beta currencies to outperform.

The dollar's August unwind and what it set up

The greenback's 0.4% decline in August — the second consecutive monthly drop after July's joint Japan-US intervention to buy yen — reflected a fundamental repricing rather than a sentiment wobble, with MUFG Research identifying the August 19 Treasury buyback announcement as the main inflection point. The dollar's losses would have run deeper had Fed Chair Kevin Warsh not used the Jackson Hole platform to push rate-hike odds higher, partially anchoring front-end yields and preventing a disorderly break in capital flows. Even so, EUR/USD reclaimed key technical levels and sterling pushed to a six-month high as the greenback absorbed the brunt of the move, with concerns over US fiscal sustainability and Fed communication credibility compounding the policy signal. The Canadian dollar illustrates how quickly fundamentals can split from flows: relatively firm domestic data was offset by the breakdown in US-Canada trade negotiations, which introduced fresh tariff risk and capped the loonie's upside even as the broad dollar sold off.

September's central bank gauntlet

Every G10 central bank now meets this month, making it the densest policy window of the cycle. The FOMC decision on September 16 anchors the calendar, with over 60% probability of a hike currently priced and both the September 4 nonfarm payrolls and September 11 CPI prints likely to reshape that path. The RBNZ and Bank of Canada open the month on September 2, the ECB follows on September 10 with a 25bp move near-fully priced, and the BoE sits the day after the Fed with markets leaning heavily toward no change. The BoJ concludes the major Asian leg on September 18 with a 25bp hike nearly fully priced, while Norges Bank, the Riksbank, and the SNB all convene on September 24 — Norges at roughly 60% hike odds. The RBA rounds things out on September 29, with a 50% probability that will likely hinge on Australian data prints through the month. Parallel to the policy density, energy markets are reintroducing a stagflationary tail: European TTF gas spiked 20% in August and is up 73% from the late-June low, sitting above both BoE and ECB inflation assumptions and amplifying the case for hawkish pivots where they remain priced.

Levels and signals to monitor

We will be watching whether the renewed Treasury buyback program continues to feed debasement narratives and pressure the dollar across major crosses, or whether Chair Warsh's communication can restore the credibility premium the Fed spent August losing. The September payrolls and CPI prints will set the boundary conditions for the FOMC's pricing; the ECB and BoJ decisions will define the euro and yen legs; and gas prices — now decoupling from the Strait of Hormuz supply narrative amid rising European demand and depleted storage — will determine whether hawkish expectations hold into year-end. For traders, the month's defining trade is the dollar's response to a policy calendar where every major central bank is forced to reconcile inflation persistence with growth fragility simultaneously.