The US dollar slumped to its weakest level since early June on Monday, as a preliminary peace framework between the United States and Iran prompted investors to rotate out of safe-haven assets and into riskier positions. The dollar index touched 99.55 before steadying, marking a sharp reversal from the geopolitical premium that had supported the greenback during the Middle East conflict.
Risk-On Rally Reshapes Currency Markets
The euro climbed to $1.1601, sterling advanced to $1.3434, and the Australian and New Zealand dollars both gained ground as traders unwound safety trades built up over recent weeks. The Australian dollar rose 0.6% to $0.7079, while the kiwi added 0.4% to $0.5854, reflecting renewed appetite for cyclical currencies tied to global growth.
However, the move was not a wholesale dollar selloff but rather a measured reset. Markets remain cautious, awaiting concrete evidence that the Strait of Hormuz can reopen smoothly and that energy flows normalize. Unresolved aspects of the agreement, including Iran's nuclear program, could still derail the truce before its formal signing in Switzerland.
Oil Plunges as Geopolitical Premium Evaporates
Brent crude fell more than 4% to near $83 per barrel, erasing a significant portion of the geopolitical risk premium that had built up during the conflict. The preliminary deal, announced by US and Iranian officials, aims to end hostilities, lift the US blockade of Iranian ports, and reopen the Strait of Hormuz—a critical chokepoint for global oil and gas trade.
Lower energy prices eased fears that central banks would need to maintain tighter monetary policy to combat imported inflation, further supporting the risk-on mood. For context, the dollar had strengthened earlier amid Middle East tensions, as detailed in our previous coverage: US Dollar Holds Near 100.80 as Middle East Tensions Fuel Safe-Haven Demand.
Yen Remains Under Pressure
The Japanese yen was the notable outlier, weakening to around 160 per dollar—a level that traders view as a trigger for potential intervention by Japanese authorities. Tokyo has historically pushed back against disorderly currency moves, and the yen's persistent weakness keeps intervention risk alive.
The pressure on the yen is compounded by Japan's domestic policy backdrop. The Bank of Japan is widely expected to raise its policy rate to 1% this week, but investors are focused on whether the BOJ signals confidence to continue tightening once the oil shock fades.
Central Bank Decisions in Focus
This week's slate of central bank meetings could determine whether the dollar continues its slide or stabilizes. The Federal Reserve is expected to hold rates steady, with all attention on Chair Kevin Warsh's first press conference for clues on inflation and any potential December move. The Reserve Bank of Australia is also anticipated to keep rates at 4.35% after earlier tightening this year.
The dollar's weakness is currently built on relief rather than conviction. A durable reopening of the Strait of Hormuz would likely sustain risk appetite, but any delays or renewed tensions could quickly restore demand for havens. Meanwhile, broader market dynamics remain fluid, as seen in recent moves across asset classes: Gold Slips Below $4,040 as Oil Rally Revives Fed Rate Hike Fears.
For now, investors are watching for confirmation that the peace deal holds and that energy markets can normalize, which would further weaken the dollar and support risk assets. The coming days will test whether this risk-on shift has staying power or is merely a temporary reprieve.
This article is for informational purposes only and does not constitute financial advice.
