Average September Temperature in Idaho Falls by Year

This page contains a list of the average monthly high and low temperatures in Idaho Falls, Idaho for the month of September each year between 1948 and 2023. It is based on NOAA data.

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What Was the Hottest September Ever in Idaho Falls?

1990 was the warmest September in the history of Idaho Falls, Idaho. The average daily high temperature was 82.4 °F, and the average low was 45.9 °F.

What Was the Coldest September Ever in Idaho Falls?

1965 was the coolest September in the history of Idaho Falls, Idaho. The average daily high temperature was 64.4 °F, and the average low was 35.2 °F.

* click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	14	75.9	44.1
2022	2	81.9	45.1
2021	20	77.9	40.5
2020	32	77.8	38.6
2019	40	71.4	42.9
2018	26	77.2	39.8
2017	43	71.8	42.2
2016	39	71.7	42.9
2015	11	77.7	43.5
2014	12	77.3	43.1
2012	15	78.7	41.3
2011	9	79.8	42.1
2010	30	78.0	38.7
2009	6	81.0	42.3
2008	37	75.3	39.4
2007	50	73.0	39.7
2006	62	70.6	37.9
2005	59	72.3	38.2
2004	61	71.0	38.9
2003	54	74.0	37.8
2002	48	72.5	40.4
2001	17	78.1	41.5
2000	57	72.5	39.0
1999	65	72.5	34.7
1998	4	78.2	46.5
1993	47	74.9	38.6
1992	44	74.4	39.4
1991	22	75.6	42.0
1990	1	82.4	45.9
1989	27	76.8	40.1
1988	53	73.2	38.8
1987	24	78.5	39.0
1986	66	65.1	39.9
1985	68	65.3	38.3
1984	56	71.6	40.1
1983	18	75.3	43.9
1982	55	69.2	42.6
1981	21	76.0	41.9
1980	36	72.9	41.9
1979	19	79.6	39.6
1978	58	70.6	39.9
1977	45	72.9	40.9
1976	31	75.0	41.5
1975	49	75.3	37.4
1974	35	76.3	38.6
1973	60	68.9	41.3
1972	64	68.4	39.1
1971	69	66.2	36.8
1970	67	67.1	37.0
1969	5	78.2	45.1
1968	51	71.3	41.0
1967	13	76.5	43.9
1966	7	77.4	44.9
1965	71	64.4	35.2
1964	63	71.8	36.1
1963	3	78.4	46.6
1962	28	76.6	40.3
1961	70	63.7	37.4
1960	16	77.3	42.6
1959	52	69.4	42.9
1958	41	72.7	41.4
1957	33	76.8	39.1
1956	29	76.7	40.2
1955	38	73.9	40.8
1954	34	75.8	39.9
1953	8	78.9	43.2
1952	10	79.0	42.3
1951	46	74.5	39.2
1950	42	71.9	42.1
1949	23	76.1	41.4
1948	25	75.2	41.9

Weather Station Details

Years	Station	Coordinates
1948–2024	Idaho Falls Fanning Field	location