According to the provisional estimate from INSEE, over a year, the Consumer Price Index (CPI) should rise by 2.1% in September 2021, after +1.9% in the previous month. This increase in inflation should result from the acceleration in service and energy prices. The prices of manufactured goods, and to a lesser extent food and tobacco should slow down.

Over one month, consumer prices should fall back by 0.2%, after +0.6% in August. Service prices should contract sharply, due to the seasonal downturn in the prices of certain tourism-related services. The prices of food should drop in the wake of those of fresh food. The prices of tobacco should decrease slightly and those of manufactured goods should slow down. In contrast, the prices of energy should accelerate.

Year on year, the Harmonised Index of Consumer Prices should rise by 2.7% after +2.4% in August. Over one month, it should decrease by 0.2% after +0.7% in the previous month.