Dollar index breaks 101, hits 8-week high as market bets on further Fed rate hikes

After months of fluctuation, the U.S. Dollar Index has once again breached the 101 mark.

On September 24, driven by market expectations that the Federal Reserve will raise interest rates further, the dollar climbed against a basket of major currencies to its highest level since late July. The ICE Dollar Index touched 101.23 during trading, marking an eight-week high.

This marks the latest push by dollar bulls, following the index's previous break above 101 in June, when it hit a 13-month high.

The dollar's reversal—from weak, range-bound trading at the start of the year to a strong rebound—reflects a combination of factors: a repricing of the Fed's policy path, persistent inflationary pressures, and relative resilience in the U.S. economy. In particular, stronger-than-expected economic data, a sharp rise in U.S. Treasury yields, and hawkish signals from Fed officials have reinforced the market's "higher for longer" interest rate narrative.

A Sharp Reversal

In the first half of 2026, the Dollar Index experienced a pronounced V-shaped reversal.

At the start of the year, markets broadly anticipated that the Fed would begin a rate-cutting cycle within the year. The dollar index fell below 96, touching a low of 95.55—its weakest level in nearly four years. However, a sudden escalation of geopolitical tensions in the Middle East in late February became a turning point. Safe-haven capital quickly flowed back into U.S. markets, and a sharp rise in international energy prices triggered a rapid rebound in the dollar.

By June, the Fed's policy meeting became a key inflection point. Although the federal funds rate was held steady in the 3.50%–3.75% range, the latest dot plot showed the median rate forecast for 2026 rising to 3.875%, up from 3.625% in March. This shift quickly changed market expectations. On June 24, the Dollar Index rose to around 101.8 during trading, breaking above the 101 threshold for the first time in 13 months.

In September, the dollar's momentum strengthened further. On September 16, the Fed voted 12–0 to raise the federal funds rate target range by 25 basis points to 3.75%–4.00%, noting that U.S. economic activity continued to expand at a solid pace, domestic spending remained resilient, and inflation remained elevated.

More notably, the September dot plot showed the median federal funds rate forecast for 2026 rising further to 4.125%, significantly above the June level. Meanwhile, non-U.S. currencies broadly weakened. The euro fell to 1.1368 against the dollar, sterling dropped to 1.3223, and the dollar rose to around 158 against the yen.

Rising Rate-Hike Expectations

The core logic behind the dollar's latest rally remains interest rate differentials.

Following the Fed's hawkish policy signals, short-end U.S. Treasury yields rose rapidly, widening the relative yield advantage of dollar-denominated assets and driving capital back into the dollar.

Recent U.S. economic data have further reinforced this narrative. On September 23, the U.S. September composite PMI flash reading came in at 58.4, up from 56 in August and the highest level in nearly five years. At the same time, 2-year, 10-year, and 30-year Treasury yields rose to 4.903%, 5.116%, and 5.402%, respectively. The 10-year yield surged 14.6 basis points in a single day, reaching its highest level since July 2007.

The sharp adjustment in the Treasury market has been a key driver of the dollar's strength. On September 23, the U.S. Treasury completed a $70 billion auction of 5-year notes, with the high yield reaching 5.033%—the highest since June 2006. This suggests that, amid higher rate expectations and fiscal supply pressures, demand for U.S. government debt has softened.

Meanwhile, international oil prices have rebounded. On September 23, Brent crude futures rose 3.86% to above $103 per barrel, while WTI crude futures gained 1.81% to $92.16 per barrel. As of September 23, interest rate swaps priced in approximately a 68% probability of a 25-basis-point rate hike at the Fed's October meeting, with a December hike also largely priced in.

Fed Chair Kevin Warsh has previously emphasized reducing forward guidance and expressed a desire to make policy statements "shorter, simpler, and more focused on facts." This suggests that future market assessments of Fed policy will rely more heavily on economic data. As U.S. data continue to show resilience, markets are more likely to reprice further rate hikes.

Can the Dollar's Strength Persist?

The relative resilience of the U.S. economy provides fundamental support for the dollar.

In the labor market, nonfarm payrolls rose by 172,000 in May, far exceeding the market expectation of 88,000, while the unemployment rate held steady at 4.3%. On inflation, the May PCE price index rose 4.1% year-over-year, with core PCE up 3.4%—the fastest pace since October 2023. Additionally, the September composite PMI hit a nearly five-year high, further reinforcing expectations that the Fed will continue tightening.

The Fed's latest forecasts also indicate that inflation pressures are more persistent than previously expected. The September economic projections raised the median 2026 PCE inflation forecast to 3.7% from 3.6% in June, and the core PCE forecast to 3.4% from 3.3%. At the same time, the median federal funds rate forecast for 2026 was raised to around 4.1% from 3.8%, reflecting a shift in Fed officials' views on both inflation and the rate path.

However, the momentum behind the dollar's continued appreciation is not without risks. Lin Chengwei, chief macro analyst at Zheshang Securities, noted that the Fed's rate-hike "bullets" may still be in the air for some time, and the Dollar Index is expected to remain elevated and volatile. But once transitory factors such as oil prices and the World Cup fade, the Fed may gradually shift dovish, potentially leading to a pullback in the dollar.

A research note from CICC also argued that, as long as core inflation, consumption, and employment have not weakened in tandem, the dollar will continue to be supported by policy rate differentials and uncertainty premiums. However, the foundation for further dollar gains is not solid.

Shenwan Hongyuan Research pointed out that a sustained dollar rally typically occurs during a continuous Fed tightening cycle. With the September rate hike already delivered, if future moves are only sporadic rather than part of a sustained tightening cycle, the risk of a trend dollar appreciation remains relatively manageable.

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