The short answer: markets are suddenly more worried that the oil shock will reignite inflation before the Fed has fully beaten it. That changes the calculus from “the Fed can wait” to “the Fed may need to act preemptively.”

1. Oil above $100 → renewed inflation risk.
The latest surge is tied to escalating Middle East tensions and disruption risks around the Strait of Hormuz. Higher crude feeds directly into gasoline and energy costs and can eventually spill into transportation and other prices. The Fed itself has noted that energy prices have already been a significant source of inflation pressure this year.

2. Inflation is already above the Fed's comfort zone.
The Fed's July Monetary Policy Report said headline PCE inflation was 4.1% in May, substantially above its 2% target, with PCE energy prices up sharply. That means another sustained oil shock is particularly uncomfortable for policymakers.

3. Treasury yields rising to ~4.7% reinforce the "higher-for-longer" narrative.
The 10-year Treasury yield recently climbed to around 4.7%, reflecting a combination of inflation concerns, strong economic data and uncertainty about the Fed's policy path. Higher yields effectively tighten financial conditions even before the Fed changes its policy rate.

4. Markets are repricing the risk of a policy mistake in either direction.
If the Fed does nothing while oil stays high, inflation expectations could become harder to control. If it hikes into an oil-driven slowdown, it risks worsening growth. But with inflation still elevated, traders are increasingly assigning a non-trivial probability to the Fed choosing the inflation-fighting option.

5. The key change is not that a July hike is now the base case—it isn't.
Rather, the probability of a hike has risen sharply from very low levels. Recent market pricing has put the odds roughly in the 30–40% range, depending on the snapshot and market used, versus around 10% earlier in the month. The Reuters analysis also highlighted that the oil shock and rising yields have revived concerns about future Fed hikes.

The big picture

$100+ oil → higher inflation risk → higher inflation expectations → higher Treasury yields → tighter financial conditions → greater pressure on the Fed to keep rates high or hike.

The important caveat is that an oil spike caused by geopolitics is not automatically a reason for the Fed to hike. If the shock is temporary and doesn't spread into wages, core inflation and inflation expectations, the Fed could look through it. That's why the July decision remains finely balanced: the Fed has to judge whether the oil surge is a temporary price-level shock or the beginning of a persistent inflation problem.

So, in one sentence: the odds of a July hike are rising because markets now see a greater chance that the combination of $100+ oil and already-elevated inflation will force the Fed to prioritize price stability over waiting for clearer evidence that inflation is cooling.
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