Dollar tumbles to four-week low after Hormuz ceasefire as oil drops 15% from highs. All eyes now on Friday's U.S. CPI for the rally's next test.

Key Highlights

  • The U.S. dollar edged lower on Tuesday as investors held defensive positions ahead of Trump's 8 p.m. deadline for Iran to reopen the Strait of Hormuz.
  • A last-minute two-week ceasefire brokered by Pakistan sent the Dollar Index to 98.838, a four-week low, on Wednesday.
  • The Australian dollar and sterling led G10 gains, climbing 1.1% and 1% respectively as risk appetite returned sharply across global markets.
  • Oil prices collapsed more than 15% from intraday highs above $117, with Brent falling below $95 a barrel on prospects of Hormuz reopening.
  • Friday's U.S. March CPI release will determine whether the ceasefire-driven relief narrative holds or war-related inflation forces a reassessment.

From Edge-of-Seat Anxiety to Relief: The Dollar's Two-Day Arc

For much of Tuesday, the U.S. dollar drifted modestly lower, held in check by a market unable to price a binary geopolitical outcome with any conviction. The Dollar Index slipped 0.04%, as concerns mounted that the Iran conflict could spike energy prices and derail the broader economy, with additional pressure from dovish remarks by New York Fed President John Williams.

The greenback had been trading near its highest levels in almost 11 months, with investors pausing ahead of the U.S.-imposed deadline for Iran to reopen the Strait of Hormuz or face attacks on its infrastructure. Brent crude hovered around $110 a barrel as Iran's rejection of the U.S. ceasefire proposal kept tensions elevated, and traders were no longer pricing a Federal Reserve move until well into the second half of 2027, compared with expectations of two rate cuts in 2026 at the start of the year.

With roughly 90 minutes before the deadline expired, the dynamic shifted. Trump agreed to suspend the bombing and attack of Iran for two weeks, contingent on the complete, immediate, and safe opening of the Strait of Hormuz, calling it a "double-sided ceasefire." Iran confirmed that safe passage through the Strait would be possible via coordination with Iran's Armed Forces, with due consideration of technical limitations.

The market response on Wednesday was immediate and broad. The euro rose 0.9% to $1.1698, the pound gained 1% to $1.3428, and the dollar slid nearly 1% against the yen to 158.12. The Australian dollar climbed 1.1% to $0.7054, while the Dollar Index fell to 98.838, its weakest since mid-March. The greenback gave back more than half of its gains accumulated since the war began. U.S. crude slid more than 15% to around $95 a barrel after trading as high as $117 on Tuesday, while Japan's Nikkei gained 5.4%, Germany's DAX rose 4.7%, and S&P 500 futures climbed 2.5%.

Rates Recalibration and the Monetary Policy Shift

The ceasefire triggered a meaningful reassessment of the monetary policy outlook. Markets moved to price roughly a 50% probability of a Federal Reserve rate cut by year-end, having previously seen no such move, while ECB rate hike expectations also moderated from nearly three priced the prior week to two by January.

Falling energy prices, if sustained, reduce headline inflation pressure and potentially reopen the easing window for the Fed, compressing the U.S.-global yield differential that had underpinned dollar strength throughout the conflict. However, the durability of this recalibration depends entirely on how completely the Strait reopens and whether the ceasefire survives its initial two-week period. As one FX strategist noted, a lot has to happen in the next fourteen days, and currencies remain vulnerable to sharp retracement if the truce frays.

CPI: The Next Valuation Anchor

The relief rally now faces its first significant data test. U.S. consumer inflation expectations rose in March and transportation costs in the logistics sector saw a notable increase, with Friday's March CPI release expected to provide further insight into price pressures linked to the conflict.

A reading demonstrating significant war-related inflation transmission into consumer prices would complicate the easing narrative markets have begun to construct. A contained print would validate the rally and support further erosion of the dollar's geopolitical premium.

The dollar's two-day arc, from modest safe-haven accumulation to sharp broad-based decline, illustrates a structural truth about geopolitically driven currency moves. The risk premium builds slowly over weeks of persistent uncertainty and unwinds in hours once the binary outcome resolves. Whether this resolution proves durable or merely the latest postponement in a conflict without a settled framework for peace remains the central question for capital markets over the next fourteen days.