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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Costco’s latest monthly release shows adjusted comparable-sales growth easing from 6.6% in July 2026 to 5.4% in August. That verifies a one-month slowdown, not the headline’s full claim of three consecutive monthly declines: the June monthly adjusted rate is not established in the available official releases. Costco’s investor calendar scheduled its September sales report for October 7, 2026; results were still pending as of October 4.
What Costco’s latest monthly figures show
Costco’s August 2026 release reported total-company comparable-sales growth of 5.4% after excluding changes in gasoline prices and foreign exchange. In July, the same adjusted measure was 6.6%. The difference is a decline of 1.2 percentage points, calculated from Costco’s reported monthly figures. Costco’s August results and July results are the direct comparisons.
That comparison is narrower than saying growth slowed for three months in a row. The June monthly adjusted rate is not established by the cited releases, so the complete three-month sequence cannot be verified here. Costco’s fourth-quarter adjusted comparable-sales growth of 6.7% covers sixteen weeks; it is not a substitute for June’s monthly rate.
Adjusted comparable sales are not net-sales growth
Costco reports comparable sales both before and after excluding gasoline-price and foreign-exchange impacts. The adjusted measure is the closest company-reported measure to what might be called “underlying” sales growth, but Costco does not identify it as a separate metric by that name. It is also supplemental information, not a replacement for net sales reported under U.S. GAAP.
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| Period and measure | Reported result |
|---|---|
| August 2026 adjusted total-company comparable sales | 5.4% |
| August 2026 unadjusted comparable sales | 8.4% |
| August 2026 net sales | $23.70 billion, up 9.9% year over year |
| July 2026 adjusted total-company comparable sales | 6.6% |
| July 2026 unadjusted comparable sales | 8.9% |
| July 2026 net sales | $23.12 billion, up 10.7% year over year |
These measures answer different questions. Adjusted comparable sales compare sales at established locations while removing estimated gasoline-price and foreign-exchange effects. Unadjusted comparable sales retain those effects. Net-sales growth compares total reported sales with the year-earlier period, so it should not be treated as another reading of adjusted comparable-sales momentum.
August’s calendar effect and regional variation
Costco said Labor Day fell one week later in the United States and Canada in 2026, negatively affecting August total and comparable sales by “a little less than 75 bps.” That is Costco’s estimate of the calendar impact; it does not mean the holiday shift accounts for the entire July-to-August decline.
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August’s adjusted comparable-sales rates also differed by region: 5.6% in the U.S., 2.8% in Canada, and 6.8% in Other International. Digitally-enabled comparable-sales growth was 17.9%, a separate measure Costco reported for the month. Regional and digital figures should not be conflated with the total-company rate.
Longer-term context
For fiscal 2026, Costco reported net sales of $297.2 billion, up 10.1%, and adjusted full-year comparable-sales growth of 6.6%. Fourth-quarter adjusted comparable-sales growth was 6.7%; unadjusted growth for the quarter was 9.4%. These broader periods provide context, but they cannot establish the missing June monthly figure. See Costco’s fourth-quarter and fiscal-year 2026 results.
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When Costco reports September sales
Costco’s official investor events calendar listed September Sales Results for October 7, 2026. As of October 4, the September figures had not been released. The date is the scheduled report date, not a reported result or a forecast of what sales will be.
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