CPI month-over-month in Jun 2026?

rationale:

The assessment of the June 2026 month-over-month CPI is dominated by a sharp reversal in energy prices. Following the energy-driven inflation spikes in April and May—where May headline CPI rose 0.5% m/m largely due to a Middle East conflict bls.gov—a mid-June ceasefire triggered a rapid decline in oil and gasoline prices.

AAA data shows the national regular gasoline average falling consecutively from above $4.50 in May to $3.918 by June 25 gasprices.aaa.com gasprices.aaa.com. EIA weekly all-grades gasoline data confirms this trend, dropping from roughly $4.60 in May to $4.048 through the week of June 22 eia.gov. Extrapolating through the end of June implies a monthly decline in gasoline prices of approximately 9%.

Given that gasoline accounts for about 3.9% of the CPI basket bls.gov, a 9% drop translates to roughly a 0.35 to 0.40 percentage point drag on the headline CPI figure before accounting for core and food components bls.gov. Meanwhile, core inflation is expected to remain positive. The Cleveland Fed Nowcast, updated in late June, estimates core CPI at +0.23% m/m clevelandfed.org.

Combining a core print of +0.2% to +0.3% with an energy drag of roughly -0.35% to -0.40% points to a net headline CPI change of approximately -0.15%. Because the BLS reports the headline figure to one decimal place kalshi-public-docs.s3.amazonaws.com, an underlying print near -0.15% creates a near toss-up between -0.1% and -0.2%. Consequently, these two outcomes receive the bulk of the probability mass (32% and 34%, respectively).

There are two primary forces pulling on the tails. On the upside, the Cleveland Fed Nowcast for June headline CPI sits at -0.02% clevelandfed.org clevelandfed.org. While bottom-up math suggests a deeper drag, the Nowcast's proximity to zero warrants preserving a 12% probability for exactly 0.0%. On the downside, a 12% probability is assigned to -0.3% in the event that the late-June gasoline drop hits the survey harder than anticipated or core services surprise to the downside. Extreme positive tail outcomes are highly unlikely given the confirmed energy crash, retaining only nominal probability for extreme upside surprises in core components. Deep deflation below -0.4% (captured in 'Other') remains a minor tail risk.