Friday, September 11, 2026

The Seasonally Adjusted CPI Was Up 0.396% in August

Here are the changes in the seasonally adjusted CPI for the six months ending in June: 

Feb. 0.2670
March 0.8651%
April 0.6400%
May 0.4729%
June -0.4220%
July 0.0737%
 
See Consumer Price Index for All Urban Consumers: All Items in U.S. City Average from FRED (Federal Reserve Economic Data) compiled by the Research Division at the Federal Reserve Bank of St. Louis for data on the seasonally adjusted CPI.  

That site shows a graph but if you click on the Download button you will get the actual numbers in Microsoft Excel.

The Consumer Price Index for All Urban Consumers: All Items in U.S. City Average (CPIAUCSL) was 332.813 in July and 334.131 in Aug. Since 334.131/332.813 = 1.00396, that means it was up 0.396%. If we had that every month for 12 months the CPI would be up 4.86%. 

It was 323.291 in Aug. 2025. Since 334.131/323.291 = 1.0335, that means it was up 3.35% over the last 12 months. 

The non-seasonally adjusted CPI was 334.980 in Aug. and 323.976 in Aug. 2025. That was up 3.4%. So pretty close to the seasonally adjusted CPI. This is well above the Fed's target of 2.0% (although they prefer to use the Personal Consumption Expenditures Price Index which was 3.7% higher in July 2026 than July 2025).

For more information see Inflation persisted in August, potentially locking in a Fed interest rate hike by Jeff Cox of CNBC. Excerpt:   

"Prices for a wide swath of goods and services continued to climb in August, according to a report Friday that raises the specter of a Federal Reserve interest rate hike next week.

The consumer price index rose a seasonally adjusted 0.4% for the month, putting the 12-month increase at 3.4%, the Bureau of Labor Statistics reported Friday. Both readings were in line with the Dow Jones consensus.

However, stripping out volatile food and energy prices, the core CPI posted a 0.3% monthly gain, or 0.1 percentage point higher than forecast. The core annual rate came in at 2.4%, matching the estimate."

The article also discusses what types of products are going up in price and what is going down. There is a graph of the monthly year-over-year percent change in prices and core prices going back almost 4 years.

Related material: 

Consumer Price Index for All Urban Consumers: All Items Less Food and Energy in U.S. City Average (CPILFESL) This is also from from FRED (Federal Reserve Economic Data), compiled by the Research Division at the Federal Reserve Bank of St. Louis. It has the seasonally adjusted core CPI.
 
 
 
The Bureau of Labor Statistics makes seasonal adjustments. See Consumer Price Index Summary.
 
The table below has the annual inflation rate since 1914 in the columns labeled CPI %Ch. or CPI percentage change. It is from Consumer Price Index Data from 1913 to 2026 and is not seasonally adjusted. It is also the December to December change in the CPI. That site also looks at how the 12 month average for the CPI changed from one year to the next.
 

Year

CPI %Ch.

 

Year

CPI %Ch.

 

Year

CPI %Ch.

 

Year

CPI %Ch.

1914

1

 

1944

2.3

 

1974

12.3

 

2004

3.3

1915

2

 

1945

2.2

 

1975

6.9

 

2005

3.4

1916

12.6

 

1946

18.1

 

1976

4.9

 

2006

2.5

1917

18.1

 

1947

8.8

 

1977

6.7

 

2007

4.1

1918

20.4

 

1948

3

 

1978

9

 

2008

0.1

1919

14.5

 

1949

-2.1

 

1979

13.3

 

2009

2.7

1920

2.6

 

1950

5.9

 

1980

12.5

 

2010

1.5

1921

-10.8

 

1951

6

 

1981

8.9

 

2011

3

1922

-2.3

 

1952

0.8

 

1982

3.8

 

2012

1.7

1923

2.4

 

1953

0.7

 

1983

3.8

 

2013

1.5

1924

0

 

1954

-0.7

 

1984

3.9

 

2014

0.8

1925

3.5

 

1955

0.4

 

1985

3.8

 

2015

0.7

1926

-1.1

 

1956

3

 

1986

1.1

 

2016

2.1

1927

-2.3

 

1957

2.9

 

1987

4.4

 

2017

2.1

1928

-1.2

 

1958

1.8

 

1988

4.4

 

2018

1.9

1929

0.6

 

1959

1.7

 

1989

4.6

 

2019

2.3

1930

-6.4

 

1960

1.4

 

1990

6.1

 

2020

1.4

1931

-9.3

 

1961

0.7

 

1991

3.1

 

2021

7

1932

-10.3

 

1962

1.3

 

1992

2.9

 

2022

6.5

1933

0.8

 

1963

1.6

 

1993

2.7

 

2023

3.4

1934

1.5

 

1964

1

 

1994

2.7

 

2024

2.9

1935

3

 

1965

1.9

 

1995

2.5

 

         2025    

          2.7

1936

1.4

 

1966

3.5

 

1996

3.3

 

 

 

1937

2.9

 

1967

3

 

1997

1.7

 

 

 

1938

-2.8

 

1968

4.7

 

1998

1.6

 

 

 

1939

0

 

1969

6.2

 

1999

2.7

 

 

 

1940

0.7

 

1970

5.6

 

2000

3.4

 

 

 

1941

9.9

 

1971

3.3

 

2001

1.6

 

 

 

1942

9

 

1972

3.4

 

2002

2.4

 

 

 

1943

3

 

1973

8.7

 

2003

1.9

 

 

 

 
Here is a timeline graph of this data: 
 
 

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