The U.S. dollar held firm on Monday, July 20, 2026, as fresh U.S. strikes on Iran lifted oil prices and pushed traders toward safe-haven assets. Brent crude topped $90 a barrel. The euro, pound and yen all stayed on the back foot, and stock futures slipped.
The move matters for anyone who trades currencies or imports energy. Higher oil raises inflation risk and import bills. That tends to weigh on the currencies of big energy buyers while lifting the dollar, since the United States is a net energy exporter. The dollar’s safe-haven role means it often gains when conflict flares, even when U.S. data is soft.
How US-Iran strikes pushed Brent past $90
Brent crude for September delivery rose about 2.54% to trade above $90 a barrel, while U.S. West Texas Intermediate for August climbed about 2.29% to $84.38. The gains followed another round of U.S. strikes on Iran and new American military casualties. The U.S. military said a third service member had been killed in recent operations, and investigators recovered unidentified remains near the site of an earlier Iranian attack in Jordan that had killed two U.S. personnel and left another missing.
Prices have climbed for weeks. By July 17, U.S. forces had run a sixth straight night of strikes, and Iran had hit back at U.S. bases in Kuwait, Jordan and Bahrain. Washington also reinstated a naval blockade of Iranian ports near the Strait of Hormuz. On July 14, President Donald Trump dropped a plan to charge ships a 20% fee to cross the strait, after Tehran agreed to hold off on tolls for 60 days under a June 17 interim deal.
Where the euro, pound and yen stood
The dollar bought 162.48 yen, its strongest level since July 9. On the USD/JPY pair, that keeps the yen near the weak end of its recent range. The euro slipped 0.1% to $1.1426, easing from one-month highs. EUR/USD has struggled to hold above $1.1450 in recent sessions. The British pound was flat at $1.3445, leaving GBP/USD little changed. The Australian dollar eased 0.1% to $0.6975.
The U.S. dollar index, or DXY, traded near 100.7 to 100.9. That sits close to a one-month low, but the gauge has firmed on safe-haven demand as buyers seek shelter. Westpac analysts called FX markets “relatively subdued, with the USD broadly stable.”
Why costlier oil is pressuring the yen
Japan imports most of its energy. Higher oil raises its import costs and worsens its trade balance. That gives traders a reason to sell yen, analysts at Aozora Bank said. Rising oil also revives worries about U.S. inflation, which could keep Federal Reserve rates higher for longer and support the dollar.
Fear of Japanese intervention has capped the yen‘s losses near 162 per dollar. In India, the rupee weakened, and the Reserve Bank of India stepped in to slow the slide, Reuters reported.
Dates and data that could steer the dollar next
Traders are watching three markers. The first is whether the June 17 truce on Hormuz tolls holds past its 60-day window, which runs into mid-August. The second is any move by Iran to press Yemen’s Houthi forces to disrupt Red Sea shipping, a step Reuters reported Tehran had readied. The third is upcoming U.S. inflation and jobs data, which will shape Fed rate bets.
The safe-haven bid may not last. Natixis projects the dollar index could fall toward 98 by the end of 2026 as its recent rally fades. For now, oil and the conflict are setting the tone across FX.
