The Consumer Price Index (CPI) rose 5.3% between September 2020 and August 2021 (12 months) as this publication of the Bureau of Labor Statistics shows. This represents a slight decline compared to the previous report. In August the CPI increased 0.3%

The main drivers of this rise have been the price of used vehicles, and energy again.

This is the official inflation rate. However, there are other calculations, specially the ones using the methodology prior to the 1980's, which show higher inflation rates. For a view at these rates take a look here.

Previous posts regarding the inflation rate

July 15, 2021. Inflation Peaks as CPI Rises 5.4%
September 12, 2021. 12-Month Percent Change in CPI is 5.4% in July 2021