Oil tops $90 as Wall Street slips on Iran strikes
Published on August 31, 2026
Oil jumped more than 2% overnight after US strikes on Iranian targets, and Wall Street starts the last session of August on the back foot. S&P 500 and Nasdaq futures are lower, right as bets on a September Fed rate hike jumped to 57%. A more expensive barrel landing exactly when the central bank says it is worried about inflation is the one setup stocks had not priced in.
Oil pushes back above $90 after the Iran strikes
Late Sunday, the US military destroyed two Iranian rocket launchers on Larak Island, at the mouth of the Strait of Hormuz. CENTCOM said the Revolutionary Guard was preparing to fire rockets carrying sea mines. Tehran hit back with ballistic missiles and drones aimed at two US air bases in Jordan. Jordanian air defenses shot down eight missiles and no casualties were reported, Benzinga reported.
The reaction in crude was instant. Brent climbed back above $90, up roughly 2.7%, while WTI recovered toward $85, according to Trading Economics. It is the first direct clash in more than a month in a waterway that carries a large share of the world's seaborne crude, OilPrice reported.
Wall Street takes the hit, and the Fed makes it worse
Friday already ended in the red. The S&P 500 closed at 7,711.71, down 0.25%, the Nasdaq Composite at 26,402.42, off 0.52%, and the Dow at 53,559.99, barely changed, per TheStreet. All three still finished the week higher.
The real jolt came from Jackson Hole. Fed Chair Kevin Warsh said the economy "appears to have strengthened" while repeating that inflation is still too high. In a single day, the odds of a 25 basis point hike in September went from 35% to 57%. The two year Treasury yield climbed to 4.33%, a one month high.
Tom Essaye, founder of Sevens Report Research, had warned ahead of the speech that Warsh needed to "signal to the market that he's not interested in sort of starting an extended rate-hike campaign." That signal never arrived. Rate sensitive names were hit hardest and the Russell 2000 dropped 1.31%.
What pricier oil means for the S&P 500 and the Nasdaq
A $90 barrel feeds straight into inflation through fuel, freight and production costs. That is where this gets awkward. The Fed wants inflation heading back to 2% before it eases off, and an energy shock pushes that date further out. Stocks are caught between two forces pulling the same way.
The cleanest tell is gold. A military escalation normally lifts the metal. Instead it slid below $4,450, dragged down by the prospect of higher rates that pay investors to sit in cash. The dollar is the winner. The dollar index is holding near 99.6 and the yen has broken through 160. Sim Moh Siong, currency strategist at OCBC, said Warsh's "defense of the inflation target has reduced a major drag on the U.S. dollar," Reuters reported.
Europe is a step behind the news. On Friday the Euro Stoxx 50 gained 0.95% and the DAX added 0.77%, led by carmakers. London is shut on Monday for a bank holiday, which will thin out volume all session.
Key levels today
| Instrument | Level (support / resistance) | Change (last session) | Scenario / What to watch |
|---|---|---|---|
| S&P 500 | Support 7,600, resistance 7,800 | -0.25% Friday | A close under 7,700 puts 7,600 back in play. Above 7,800, the 7,816.70 record becomes the target again |
| Brent | Support $85, resistance $93 | +2.7% Monday morning | A break above $93 flips the market into full oil shock mode. Back under $85 and the risk premium deflates |
Economic calendar
Tuesday, September 1, 11:00 Paris : euro zone flash CPI for August. Above 3%, bets on a firmer ECB come back and the euro can claw back ground against the dollar.
Tuesday, September 1, 16:00 Paris : US ISM manufacturing. A print above 50 backs the resilient economy story, strengthens the hike camp and weighs on indexes.
Thursday, September 3, 16:00 Paris : ISM services. The prices paid subindex is what matters here. If it rises, traders stack expensive oil on top of sticky services inflation.
Friday, September 4, 14:30 Paris : August US jobs report. July showed 23,000 jobs lost and unemployment at 4.1%. A clean rebound pushes hike odds past 57%, a weak number knocks them back.
The bottom line
Oil above $90 after the Iran strikes adds inflation pressure the Fed did not need. Wall Street heads into the final session of August with 57% odds of a September hike and a jobs report on Friday.
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This is not investment advice. Informational content only.