Montana September Temperature by Year

This page is a list of the average statewide temperature in the month of September in Montana 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 Montana History?

1998 was the warmest September in Montana history. Statewide, the average daily high temperature was 76.3 °F, and the average low was 46.5 °F.

What Was the Coldest September in Montana History?

1965 was the coolest September in Montana history. Statewide, the average daily high temperature was 53.4 °F, and the average low was 33.8 °F.

Click column headers to sort

Year	Rank	High (°F)	Low (°F)
2023	13	71.9	45.0
2022	3	76.0	45.2
2021	15	74.0	42.6
2020	22	72.3	41.6
2019	50	66.6	43.4
2018	89	66.0	40.1
2017	46	68.5	41.8
2016	54	67.0	42.6
2015	21	71.9	42.6
2014	48	68.7	41.5
2013	9	71.5	46.1
2012	17	74.8	41.7
2011	15	74.8	41.9
2010	70	67.0	41.2
2009	3	77.3	44.0
2008	78	68.1	39.2
2007	50	69.6	40.5
2006	54	68.5	41.0
2005	44	69.8	41.0
2004	70	67.3	41.0
2003	62	68.8	40.4
2002	38	69.5	41.8
2001	11	73.8	43.6
2000	64	68.3	40.5
1999	105	65.9	37.4
1998	1	76.3	46.5
1997	18	73.1	43.0
1996	95	65.5	39.8
1995	63	68.7	40.2
1994	12	74.7	42.5
1993	105	65.5	37.6
1992	82	67.9	39.0
1991	40	69.9	41.4
1990	5	77.0	43.6
1989	65	69.5	39.1
1988	74	67.9	39.8
1987	30	72.6	40.4
1986	123	57.9	39.9
1985	126	57.9	37.8
1984	122	61.6	36.5
1983	101	65.1	39.0
1982	93	65.9	39.4
1981	30	72.3	40.6
1980	59	68.1	41.4
1979	13	75.1	41.8
1978	44	68.4	42.4
1977	88	65.5	40.8
1976	27	72.6	40.8
1975	84	68.7	37.6
1974	99	67.5	36.9
1973	89	65.4	40.6
1972	114	63.6	37.0
1971	109	64.4	37.7
1970	110	64.2	37.8
1969	23	72.1	41.6
1968	74	66.7	41.0
1967	8	74.4	44.0
1966	9	73.5	44.1
1965	129	53.4	33.8
1964	112	63.7	37.8
1963	6	74.2	45.7
1962	84	68.1	38.2
1961	125	59.9	36.2
1960	42	71.4	39.7
1959	102	63.8	40.2
1958	54	69.2	40.3
1957	67	68.3	40.1
1956	53	70.0	39.7
1955	92	67.1	38.6
1954	82	66.4	40.4
1953	32	72.1	40.7
1952	20	73.2	41.8
1951	115	62.4	37.7
1950	93	65.9	39.5
1949	74	68.9	38.7
1948	27	72.0	41.4
1947	78	66.0	41.1
1946	89	65.8	40.2
1945	107	64.5	38.2
1944	54	69.5	40.1
1943	59	71.4	38.0
1942	73	67.7	40.1
1941	119	60.3	39.0
1940	7	72.7	46.6
1939	37	71.0	40.9
1938	2	76.4	45.2
1937	29	70.7	42.5
1936	42	70.1	40.8
1935	33	71.9	40.3
1934	118	62.7	36.6
1933	67	67.8	40.8
1932	72	69.5	38.4
1931	40	68.6	42.7
1930	59	68.1	41.2
1929	120	61.9	36.9
1928	84	68.5	37.7
1927	97	64.6	40.3
1926	128	58.4	35.1
1925	84	64.4	41.8
1924	77	68.6	38.8
1923	38	70.1	41.4
1922	19	73.2	42.6
1921	116	61.9	37.9
1920	50	68.6	41.3
1919	48	68.1	42.0
1918	80	67.0	40.0
1917	46	69.2	41.1
1916	95	66.5	38.6
1915	116	60.8	39.0
1914	67	68.3	40.0
1913	54	70.2	39.4
1912	127	58.4	35.6
1911	104	63.7	39.7
1910	97	64.6	40.3
1909	35	69.1	42.8
1908	33	70.2	42.0
1907	99	64.9	39.4
1906	25	71.2	42.3
1905	25	70.9	42.8
1904	65	69.4	39.2
1903	111	62.7	38.8
1902	107	66.3	36.4
1901	124	59.0	38.3
1900	102	63.5	40.5
1899	35	71.3	40.7
1898	80	67.5	39.5
1897	23	71.8	42.0
1896	120	61.9	37.0
1895	112	64.2	37.2