On July 14, the U.S. Bureau of Labor released the June 2026 CPI data. In June, CPI rose 3.5% year-over-year unadjusted for seasonality, below the market expectation of 3.8% and down sharply from the prior value of 4.2%; core CPI rose 2.6% year-over-year as well, also below the expected 2.8% and the prior value of 2.9%. Seasonally adjusted CPI fell 0.4% month-over-month, marking the largest single-month decline since April 2020, and also the first time in six years that CPI recorded negative month-over-month growth.

This inflation report was supposed to be a catalyst for a more accommodative trading stance in the market. After the data was released, U.S. Treasury yields and the U.S. dollar index both dropped, gold prices rebounded, and U.S. stock index futures rose. However, this “late” inflation tailwind only lasted for less than 48 hours—the sudden escalation of the U.S.-Iran military conflict is rewriting the inflation outlook and the Federal Reserve’s policy path at a pace far exceeding market expectations.

## June CPI: An energy-price-driven “technical cooldown”

The upside surprise decline in June CPI is essentially an energy-price-driven technical cooldown. In June, energy prices fell 5.7% month-over-month, versus an increase of 3.9% in the prior period. Energy alone dragged CPI by 0.43 percentage points month-over-month, which basically explains the entire month-over-month decline in June’s CPI. Specifically, energy goods fell 9.5% month-over-month, and U.S. gasoline prices declined for four consecutive weeks throughout June. Core goods fell 0.1% month-over-month, marking two straight months of declines; the month-over-month growth rate for core services fell from the prior value of 0.3% to 0%.

In other words, the broad cooling in the June inflation data depends heavily on international oil prices.