Oil prices head for steepest weekly gain since July amid renewed U.S.-Iran military strikes

Oil prices are heading for their steepest weekly gains since mid-July 2026, with Brent crude rising over 7% to $96.06 a barrel and WTI climbing over 9% to $92.10. The surge is driven by the fiercest U.S.-Iran military clashes in months, featuring heavy U.S. airstrikes on Iranian coastal targets and retaliatory Iranian strikes. Shipping transits through the critical Strait of Hormuz have plummeted amid sea mine explosions and expanded Iranian vessel blacklists, prompting regional military alerts and threats of further escalation from Israel.

U.S.-Iran military strikes

• ▪U.S. military attacks in September 2026 killed and wounded dozens of people, including Iranian civilians, marking the fiercest clashes between the two nations since July 2026.
• ▪U.S. President Donald Trump stated the strikes were in retaliation for an Iranian attempt to lay sea mines in the Strait of Hormuz and an Iranian attack shooting eight missiles at a U.S. military base in Jordan.
• ▪U.S. President Donald Trump announced large and powerful strikes on Iranian targets near the Strait of Hormuz, targeting radar and missile systems on Iran's southern coast.
• ▪Iran pledged retaliation following the U.S. strikes and fired on American military bases across the Middle East region.

Strait of Hormuz disruption

• ▪Iran expanded its list of vessels deemed non-compliant and subject to fines, confiscation, or detention if they attempt to transit the Strait of Hormuz.
• ▪Iran's Islamic Revolutionary Guard Corps stated that two oil tankers hit sea mines and were disabled while attempting to transit the Strait of Hormuz on September 1, 2026.
• ▪Vessel crossings through the Strait of Hormuz dropped from 23 crossings on August 26, 2026, to 10 crossings on August 31, 2026, amid escalating hostilities.
• ▪U.S. Secretary of Energy Chris Wright claimed that 17 million barrels of oil transited the Strait of Hormuz on August 31, 2026, marking the largest volume since the war began.

Oil price surge

• ▪Brent crude rose to $96.06 a barrel and West Texas Intermediate rose to $92.10 on September 4, 2026, heading for their steepest weekly gains since mid-July 2026.
• ▪U.S. crude oil inventories fell by 4.5 million barrels in the last week of August 2026, exceeding analysts' expectations of a 1.1 million-barrel draw.
• ▪On a weekly basis ending September 4, 2026, Brent crude rose between 7.1% and 7.6% while West Texas Intermediate rose between 9.8% and 10.4%.

Regional security responses

• ▪U.S. Vice President JD Vance stated that Washington will not hold talks with Iran unless Tehran stops attacking commercial shipping in the Strait of Hormuz.
• ▪Kuwait, Jordan, and Bahrain sounded military alerts and intercepted missiles on the morning of September 2, 2026.
• ▪Iraq increased its oil exports to 2.34 million barrels per day in August 2026 from 1.35 million barrels per day in July 2026 after receiving Iranian transit approvals.
• ▪Israeli Defence Minister Israel Katz warned that Israel would cripple Iran's military and civilian infrastructure, including energy facilities.

U.S.-Iran conflict background

• ▪The U.S.-Iran war, which began with joint U.S.-Israeli strikes on Iranian targets in late February 2026, entered its seventh month in September 2026.
• ▪Prior to the outbreak of the war in February 2026, approximately one-fifth of global oil exports passed through the Strait of Hormuz.

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