Oil Prices Surge as US-Iran Fighting Chokes Off the Strait of Hormuz
Brent crude rose 7.8% and WTI (West Texas Intermediate, the US benchmark for oil prices) gained nearly 10% in the week ending September 7, 2026, after the US and Iran resumed attacks that reduced oil flows through the Strait of Hormuz Reuters. The weekly advance extends a run of supply-driven rallies that has accelerated since late August, when the collapse of a two-week ceasefire returned the conflict to open military escalation.
The most recent leg higher follows a September 1 session in which Brent futures settled up $4.16, or 4.6%, on renewed US-Iran fighting Reuters. That move came two days after an August 30 rally of more than 2.5% triggered by a resumption of military action, including a US attack on Iran's Larak Island Reuters. For the week ending September 4, Brent rose 7.6% and US crude gained nearly 10% as Middle East supply routes remained impaired Reuters.
The Strait of Hormuz is the choke point at the center of this crisis. Roughly a fifth of global oil consumption normally transits the narrow waterway between Iran and Oman, along with substantial LNG (liquefied natural gas) volumes. The US-Iran war has disrupted both since early March, when tanker disruptions first rattled energy markets and sent European natural gas futures surging alongside a 6% oil rally AP. Production and shipping across the Middle East have been upended since then, straining energy supplies worldwide AP.
The escalation timeline has tracked a tightening supply trajectory. On July 14, prices climbed about 2% to a one-month high after the US reimposed a naval blockade on Iran, constraining flows through the strait Reuters. Six days later, Brent topped $90 amid volatile trading as participants weighed the possibility of renewed negotiations Reuters. By July 23, Brent closed above $100 for the first time since May 22, as Houthi attacks compounded supply risks Reuters.
The first half of August saw the conflict move through a brief de-escalation phase before reversing. A two-week ceasefire had been in effect earlier in the year, and uncertainty about its durability drove a wave of positioning — traders adjusting their bets — across commodity and equity markets AP. On August 11, escalating tensions sent oil prices surging 5% in a single session Reuters. Three days later, the US threatened an indefinite naval blockade of Iran; Brent futures traded up $1.43, or 1.64%, to $88.50 at 0810 GMT that day Reuters.
The conflict's progression through the blockade, ceasefire, and resumed strikes has produced a stair-step pattern in crude pricing rather than a single shock. Each military inflection has been met with a discrete risk premium — an extra amount buyers pay because of uncertainty — that has not fully unwound before the next escalation arrives. Brent has traded from the high $80s in mid-August back through $100 territory in late July, with the latest weekly moves suggesting the market is pricing sustained impairment of Hormuz throughput rather than a transient disruption.
The broader context here is that the Strait of Hormuz disruption affects the entire energy complex, including LNG flows that feed European and Asian gas markets. The simultaneous pressure on oil and gas benchmarks signals that participants are hedging against a scenario in which the choke point remains partially closed for an extended period. For energy importers in Asia, which rely heavily on Gulf crude and LNG, the cost pass-through into refined products and industrial gas inputs is direct. For central banks still managing inflation — the rate at which prices for goods and services rise — a sustained oil price above $90 or $100 reintroduces a headline CPI (Consumer Price Index) impulse that had been fading through the first half of 2026.
What remains unpriced is the duration of the current escalation cycle. The ceasefire in the spring showed that de-escalation is possible but also that it has been short-lived. Each subsequent resumption of hostilities has produced a higher floor for Brent than the one before. Whether that pattern holds depends on factors the oil market cannot resolve: the willingness of both sides to sustain naval operations, the operational status of Iranian export infrastructure, and the degree to which alternative supply sources, including US shale and strategic reserves, can offset lost barrels.
