Eurostat’s flash estimate published on 2 October 2026 puts annual inflation in the euro area at 3.8% in September. The agency reported 3.2% for August, while the annual rate had been 2.2% in September 2025. The monthly change for September was estimated at 0.6%. These figures describe different comparisons: the annual rate compares prices with the same month a year earlier, while the monthly rate compares them with the previous month. A 3.8% annual rate does not mean prices rose by that amount during September alone. Eurostat’s figures use the Harmonised Index of Consumer Prices (HICP), and the September observation is not yet the complete, final data set. September values in the headline and component table should therefore be treated as estimates.

Energy had the highest annual rate among the main components. Energy inflation increased from 14.3% in August to 18.8% in September, with the monthly energy change estimated at 3.9%. The annual services rate moved from 3.0% to 3.2%, while the monthly rate was a 0.7% decrease. Food, alcohol and tobacco rose from 1.1% to 1.4% year on year and was estimated to increase by 0.2% month on month. For non-energy industrial goods, the annual rate eased from 1.2% to 1.1%, even as the monthly rate was estimated at a 2.1% increase. Annual and monthly component readings are presented together, but use different reference periods. A sharp change in one month does not by itself establish that an equally large annual pressure will persist.

The basket weights describe the relative share of components in the index; they do not represent price inflation. For 2026, the table assigns all items a total weight of 1,000.0 per mille, with 90.3 for energy, 468.2 for services, 189.4 for food, alcohol and tobacco, and 252.2 for non-energy industrial goods. These weights are not the same as the annual rates estimated for September. For example, energy’s 18.8% annual increase does not mean that energy makes up 18.8% of the total HICP weight. Weights and price changes convey different information; the overall rate reflects movements across components combined with their relative importance in the index. It would therefore be incorrect to recalculate the total by simply adding component inflation rates.

Country estimates also showed different annual levels and monthly movements. Eurostat’s table put the September annual rate at an estimated 6.1% in Lithuania, 5.6% in Bulgaria, 5.1% in Greece and Luxembourg, and 5.0% in Spain. Among lower readings were Latvia at 2.9%, Finland at 2.6% and Malta at 2.4%. Monthly estimates showed increases of 2.0% in Italy and 1.8% in Greece, alongside decreases of 0.9% in Malta and 0.4% in France and Cyprus. These differences alone do not compare the cost-of-living level between countries. HICP inflation measures price changes over time; it is not a direct ranking of price levels or of each household’s personal spending experience. Most country values in the table were marked as estimates.

Eurostat issues a flash estimate at the end of each reference month and releases the complete HICP set for the euro area, EU and Member States around the middle of the following month. The full September 2026 data were scheduled for 16 October. Annual inflation compares prices in the current month with the same month of the previous year; monthly inflation compares them with the month immediately before. The geographical composition has also changed over time: the euro area was EA20 through the end of 2025, then Bulgaria joined on 1 January 2026, making the aggregate EA21 from the start of 2026. Eurostat incorporates the changing composition using a chain-index formula. Thus the September 2025 comparison reflects EA20 and the aggregate from January 2026 onward reflects EA21. The later full release may revise this estimate. This first estimate alone does not establish a monetary-policy decision, household-specific inflation or the cause of energy-cost movements.