Oil markets are heading into September facing a familiar challenge: tight supply, depleted inventories, and an unresolved Middle East conflict all keeping upward pressure on crude prices.

Brent crude has climbed sharply this week as tensions between the United States and Iran have intensified. On September 4, Brent was trading around US$96 a barrel, having gained 7.6% over the week.

The core problem is that global inventories have been run down while supply through the Middle East remains disrupted. ANZ expects production from Iran and Saudi Arabia to stay under pressure through August and September, with Persian Gulf supply only beginning to recover toward the end of 2026. That leaves the market vulnerable to another supply shock, particularly with northern hemisphere seasonal demand approaching.

The geography of the region magnifies the risk. The Strait of Hormuz, the narrow chokepoint between Iran and Oman, handles roughly a fifth of global petroleum liquids consumption, according to the US Energy Information Administration, meaning even partial disruption to flows through it affects the entire world market rather than just the region. Spare production capacity that could offset a shock is also concentrated largely in the Middle East itself, limiting the buffer available from producers elsewhere.

Citi has lifted its Brent forecasts to US$110 a barrel for the second quarter, US$95 for the third quarter, and US$80 for the fourth quarter of 2026, assigning a 50% probability to that scenario. Its more bullish case assumes continued disruption to oil flows through the Strait of Hormuz. Under that scenario, Brent could reach US$150 a barrel, with average prices around US$130 in the second and third quarters before easing later in the year. The more extreme scenario is a prolonged closure of the Strait, which could push oil prices substantially higher again.

On the demand side, ANZ expects global oil consumption to fall by 1.7 million barrels per day in 2026, averaging 102.5 million barrels per day. China remains an important part of the demand picture. Reuters' August survey of 31 analysts put average 2026 Brent at US$85.08 a barrel, with US crude at US$80.20. Analysts also expect global oil demand to decline by between 1 million and 1.6 million barrels per day.

This creates an unusual tension for the market: supply is being squeezed at the same time as high prices are destroying demand. The wide gap between the consensus forecast near US$85 and Citi's US$150 disruption scenario illustrates how much the outlook hinges on whether Middle East supply normalises, rather than on demand alone.

For Australian investors, the oil price remains an important variable for the energy sector. Sustained crude prices around current levels could support cash flows and investment across Australian oil and gas producers, while higher fuel costs create a very different picture for transport, airlines, and other energy-intensive businesses. The spread of outcomes being debated among forecasters also means company guidance and upcoming quarterly production reports will be worth watching as an indicator of how producers themselves are reading the price environment.

The material provided in this article is for information only and should not be treated as investment advice. Viewers are encouraged to conduct their own research and consult with a certified financial advisor before making any investment decisions.