Iowa September Temperature by Year

This page is a list of the average statewide temperature in the month of September in Iowa for each year from 1895–2023. It is a statewide average over the entire territory of the state, based on data from the NOAA.

State:

Month:

What Was the Hottest September in Iowa History?

1931 was the warmest September in Iowa history. Statewide, the average daily high temperature was 81.8 °F, and the average low was 58.3 °F.

What Was the Coldest September in Iowa History?

1896 was the coolest September in Iowa history. Statewide, the average daily high temperature was 68.5 °F, and the average low was 46.3 °F.

Click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	12	79.6	54.9
2022	36	77.2	52.9
2021	19	79.5	53.7
2020	88	73.2	50.6
2019	5	78.0	58.4
2018	28	75.9	55.9
2017	18	79.1	54.3
2016	11	77.8	56.8
2015	3	79.3	57.5
2014	85	73.1	50.9
2013	13	79.5	54.5
2012	82	76.9	47.3
2011	109	71.9	48.6
2010	66	74.2	52.0
2009	63	75.1	51.6
2008	61	74.4	52.6
2007	42	77.4	52.1
2006	114	70.7	49.3
2005	9	80.2	55.0
2004	20	79.1	53.7
2003	101	74.0	48.1
2002	33	77.8	52.8
2001	100	72.3	50.1
2000	45	78.0	51.3
1999	98	74.6	48.1
1998	5	80.8	55.7
1997	50	75.8	52.6
1996	106	71.5	49.9
1995	109	72.1	48.4
1994	48	75.8	52.8
1993	128	67.5	47.2
1992	105	72.1	49.4
1991	76	74.3	50.4
1990	25	77.9	54.4
1989	107	72.5	48.5
1988	42	77.4	52.0
1987	71	74.4	51.2
1986	42	74.4	55.1
1985	73	72.3	53.2
1984	101	73.6	48.5
1983	50	76.9	51.6
1982	90	71.9	51.8
1981	73	75.2	50.2
1980	48	76.7	51.9
1979	50	77.6	50.8
1978	10	79.9	55.1
1977	57	74.2	53.3
1976	76	76.3	48.5
1975	121	69.9	47.5
1974	123	71.2	45.3
1973	80	71.4	52.9
1972	68	74.0	51.9
1971	38	77.5	52.2
1970	68	73.8	52.0
1969	68	74.5	51.3
1968	90	73.2	50.3
1967	112	73.0	47.3
1966	107	72.9	48.1
1965	120	68.5	49.0
1964	82	72.8	51.3
1963	53	75.4	52.8
1962	117	71.8	47.7
1961	104	71.8	50.2
1960	47	75.7	53.1
1959	73	73.6	51.8
1958	59	75.6	51.6
1957	115	71.5	48.3
1956	80	76.8	47.6
1955	30	79.5	51.3
1954	34	77.2	53.1
1953	57	79.0	48.3
1952	56	78.0	49.5
1951	121	69.8	47.6
1950	85	74.4	49.5
1949	124	71.4	44.9
1948	16	80.1	53.6
1947	20	79.0	53.7
1946	82	73.9	50.2
1945	90	73.1	50.4
1944	64	74.1	52.3
1943	119	71.2	46.8
1942	109	70.7	49.7
1941	30	76.8	54.0
1940	38	78.0	51.7
1939	5	83.0	53.5
1938	29	78.2	53.3
1937	38	78.9	50.8
1936	13	77.9	56.0
1935	54	76.4	51.5
1934	115	71.9	48.0
1933	3	80.9	56.0
1932	101	74.4	47.8
1931	1	81.8	58.3
1930	34	79.1	51.4
1929	97	72.7	50.1
1928	118	72.4	46.6
1927	23	77.9	54.6
1926	85	71.4	52.6
1925	8	79.5	56.4
1924	126	69.4	46.3
1923	64	74.0	52.4
1922	27	78.6	53.5
1921	25	78.0	54.4
1920	30	77.4	53.5
1919	20	78.6	54.2
1918	127	70.6	44.5
1917	90	73.3	50.3
1916	94	74.3	49.1
1915	71	73.4	52.3
1914	59	75.4	51.8
1913	61	75.6	51.5
1912	98	72.1	50.6
1911	41	76.3	53.3
1910	76	73.7	51.1
1909	96	72.8	50.3
1908	13	80.3	53.6
1907	88	73.3	50.4
1906	23	78.0	54.6
1905	37	76.0	54.1
1904	66	74.6	51.6
1903	112	71.4	48.8
1902	124	69.3	47.1
1901	76	74.4	50.4
1900	55	75.3	52.4
1899	94	75.1	48.3
1898	46	77.0	51.9
1897	1	84.3	55.7
1896	128	68.5	46.3
1895	17	79.4	54.1