Inflation · September 16, 2026 · 2 min read

U.S. Consumer Price Index Rises 0.4% in August as Gasoline Prices Accelerate Inflation

Published September 16, 2026 • Updated September 16, 2026

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The U.S. Bureau of Labor Statistics reported that the Consumer Price Index for All Urban Consumers increased by 0.4 percent on a seasonally adjusted basis in August 2026, accelerating from a 0.1 percent gain in July. On an unadjusted basis, the headline all-items index rose 3.4 percent over the 12 months ending August, matching the annual pace recorded in the prior month. The monthly increase was primarily driven by energy costs, as gasoline prices jumped 3.9 percent and accounted for over one-third of the headline monthly increase. Meanwhile, core CPI—which excludes food and energy components—rose 0.3 percent month-over-month and 2.4 percent year-over-year, reflecting modest upward pressure in shelter and transportation services.

The U.S. Bureau of Labor Statistics released its Consumer Price Index report for August 2026, showing a seasonally adjusted monthly increase of 0.4 percent for the all-items index. This represents a notable uptick from the 0.1 percent increase recorded in July 2026. Over the past 12 months, headline consumer prices grew by 3.4 percent before seasonal adjustment, remaining flat relative to the year-over-year rate observed in the prior reporting period. The primary catalyst behind August's monthly increase was energy costs, which expanded by 2.1 percent overall, headlined by a 3.9 percent rise in the gasoline index. Food prices exhibited a more muted trajectory, inching up 0.1 percent on the month and 2.7 percent from a year earlier, with food away from home increasing 0.3 percent while grocery costs remained comparatively subdued. Excluding the food and energy sectors, the core Consumer Price Index advanced 0.3 percent in August after a 0.2 percent increase in July. On a 12-month basis, core inflation slowed slightly to 2.4 percent, compared with a 2.5 percent annual pace recorded in July. Upward momentum within core categories was led by shelter costs, which gained 0.3 percent over the month following a 0.1 percent increase in July, alongside advances in communication, lodging away from home, airline fares, and used cars and trucks. Conversely, downward adjustments were registered in medical care services and motor vehicle insurance. Policy analysts and central bank officials closely monitor these expenditure trends to determine whether underlying price pressures are stabilizing toward long-run policy targets or experiencing localized persistent friction. Economic commentators emphasize that single-month data movements should be interpreted with caution due to underlying volatility in commodity prices, particularly energy markets. While headline figures reflect immediate consumer expense shifts, the persistent differential between top-line CPI and core metrics underscores the varying drivers currently influencing domestic consumer purchasing power. Future statistical revisions and subsequent monthly readings from federal economic agencies will provide additional clarity regarding broader structural economic trends.

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