Great Falls, MT: September

30 September 2026: September 2026 averaged 58.7°F in Great Falls, MT, the warmest September since 2025, 50th warmest of 129.

September 2026

Mean temperature: 58.7°F; Warmest since 2025; 50th warmest of 129
Precipitation: 1.00 in; Driest since 2025; 58th driest of 135

A normal September in Great Falls, MT (1991 to 2020): a mean temperature of 56.8°F, between 54.1°F and 61.9°F in eight years of ten and 1.46 in of precipitation, between 0.27 in and 2.22 in in eight years of ten.

The mean temperature of every September in Great Falls, MT since 1894: 58.7°F in 2026; the highest is 65.5°F, in 1938.

Normal range, 54.1 to 61.9°F

Every year, ranked, as a table

Every September in Great Falls, MT from 1892 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.

Year	Mean, °F	Rank	High, °F	Rank	Low, °F	Rank	Precipitation, in	Rank	Days missing
2026	58.7	50	72.1	50	45.2	40	1.00	76	0
2025	63.5	5	80.4	2	46.7	21	0.28	115	0
2024	62.6	9	77.8	11	47.4	13	1.80	43	0
2023	60.3	23	74.4	32	46.2	29	2.52	13	0
2022	62.2	13	78.2	7	46.1	30	2.33	19	0
2021	59.8	29	76.4	19	43.2	71	0.26	119	0
2020	58.9	40	75.3	26	42.6	86	0.49	108	0
2019	56	85	68.5	87	43.5	63	2.13	26	0
2018	54	106	66.9	101	41.2	112	1.44	58	0
2017	56.7	71	70.2	72	43.3	67	2.37	16	0
2016	55.6	94	68.6	85	42.7	79	2.22	23	0
2015	57.8	59	72.2	47	43.3	67	2.54	12	0
2014	57	67	70.4	68	43.5	63	0.72	94	0
2013	61.9	14	75.3	26	48.5	5	0.84	87	0
2012	60.9	19	78	9	43.8	58	trace	134	0
2011	62.3	12	79.3	5	45.2	40	0.20	124	0
2010	55.2	96	68.1	89	42.3	96	2.25	21	0
2009	63.6	4	80.3	3	46.9	18	0.91	82	0
2008	55	97	68.9	81	41	115	1.87	39	0
2007	56.4	78	70.8	65	42	100	1.71	47	0
2006	58.3	53	71.3	60	45.2	40	1.82	42	0
2005	56.5	74	70.3	70	42.6	86	1.68	49	0
2004	54.9	98	67	99	42.8	78	1.99	31	0
2003	56.4	78	69.7	77	43	75	1.13	73	0
2002	57	67	70.3	70	43.6	61	1.65	51	0
2001	60.6	21	76.5	18	44.6	51	1.50	55	0
2000	55.8	89	69.7	77	41.9	103	1.32	61	0
1999	52.5	116	66.6	104	38.4	131	1.72	45	0
1998	63.1	6	77.7	12	48.4	6	1.00	76	0
1997	60.5	22	75.9	22	45	45	0.27	118	0
1996	54.1	104	67.3	95	40.8	118	1.47	57	0
1995	56	85	70.4	68	41.6	107	1.20	66	0
1994	60.1	25	77.5	14	42.7	79	0.35	112	0
1993	52.5	116	65.1	115	39.9	123	1.71	47	0
1992	56.8	70	70.8	65	42.7	79	0.25	120	0
1991	57.7	61	71.9	57	43.5	63	1.00	76	0
1990	62.4	10	79.4	4	45.3	37	0.09	131	0
1989	56.1	82	69.5	79	42.7	79	1.87	39	0
1988	56	85	69.3	80	42.6	86	2.33	19	0
1987	58.9	40	74.2	33	43.6	61	1.30	63	0
1986	51.4	124	60	127	42.9	77	1.52	54	0
1985	48.2	128	57.2	128	39.2	128	3.23	5	0
1984	51.8	122	64.2	118	39.4	127	0.71	97	0
1983	53.6	112	66	110	41.2	112	1.89	37	0
1982	53.9	108	67.2	96	40.5	122	2.43	15	0
1981	59.8	29	74.5	29	45	45	0.39	111	0
1980	58	56	71.1	62	44.9	47	0.98	80	0
1979	62.9	7	79.1	6	46.7	21	0.33	113	0
1978	58.8	44	71.3	60	46.3	24	2.56	11	0
1977	56.1	82	68.8	82	43.3	67	2.22	23	0
1976	61.2	17	75.6	23	46.8	19	0.61	100	0
1975	57.3	64	72	52	42.6	86	0.74	91	0
1974	54.8	99	68.8	82	40.7	121	0.73	93	0
1973	58.1	55	70	75	46.3	24	1.29	65	0
1972	53.9	108	66.5	106	41.3	110	0.85	85	0
1971	54.7	101	66.8	102	42.5	91	0.61	100	0
1970	54.6	102	67.5	94	41.6	107	0.67	98	0
1969	61.3	15	76	20	46.6	23	0.13	129	0
1968	56.5	74	67.6	92	45.4	36	2.92	7	0
1967	62.8	8	77.7	12	48	8	1.59	52	0
1966	64.2	2	78.2	7	50.2	2	0.21	123	0
1965	45	129	53.5	129	36.5	134	1.90	35	0
1964	53.9	108	65.3	112	42.5	91	0.28	115	0
1963	64	3	77.9	10	50.1	3	0.87	84	0
1962	56.7	71	70.7	67	42.6	86	0.10	130	0
1961	50.2	126	61.4	125	39	129	1.95	32	0
1960	60.2	24	73	43	47.4	13	0.43	110	0
1959	55.7	92	66.1	109	45.3	37	1.55	53	0
1958	58.5	51	70.2	72	46.8	19	0.28	115	0
1957	59.3	36	71.1	62	47.5	12	1.68	49	0
1956	58.8	44	71.8	58	45.8	33	0.44	109	0
1955	56	85	67.7	91	44.3	55	0.16	127	0
1954	55.8	89	66.8	102	44.7	49	1.86	41	0
1953	60.9	19	74.1	36	47.6	11	1.14	72	0
1952	61.3	15	74.7	28	47.9	9	0.24	122	0
1951	52.6	115	63.7	121	41.5	109	1.44	58	0
1950	55.8	89	67.1	97	44.5	52	0.31	114	0
1949	58.4	52	70.9	64	45.9	32	0.52	104	0
1948	59.9	27	72.1	50	47.8	10	0.72	94	0
1947	56.5	74	67.1	97	46	31	2.52	13	0
1946	56.9	69	67.6	92	46.3	24	1.93	33	0
1945	54.6	102	65.6	111	43.7	60	2.60	9	0
1944	59.4	35	71.5	59	47.2	15	1.31	62	0
1943	59.2	38	73.2	40	45.2	40	0.61	100	0
1942	57.2	65	68.6	85	45.8	33	1.06	74	0
1941	51.8	122	62	122	41.7	105	3.56	1	0
1940	62.4	10	74.5	29	50.3	1	2.24	22	0
1939					45.6	35	1.30	63	7
1938	65.5	1	81	1	50	4	0.75	90	0
1937	58.9	40	73.2	40	44.5	52	1.17	68	0
1936	58.8	44	74.5	29	43.1	73	1.17	68	0
1935	59.9	27	77	15	42.7	79	0.52	104	0
1934	52.4	118	66.6	104	38.3	133	2.36	18	0
1933	57.2	65	72	52	42.4	95	0.89	83	0
1932	58.8	44	76.6	17	41	115	trace	134	0
1931	58.9	40	73.6	38	44.3	55	1.18	67	0
1930	58.8	44	73.5	39	44	57	2.03	29	0
1929	52.4	118	66.2	108	38.7	130	1.79	44	0
1928	56.5	74	72.2	47	40.9	117	0.51	107	0
1927	55.3	95	68.5	87	42.1	99	0.53	103	0
1926	48.4	127	60.4	126	36.5	134	3.42	3	0
1925	54.8	99	66.5	106	43	75	3.52	2	0
1924	58	56	74.2	33	41.8	104	2.37	16	0
1923	57.7	61	75.6	23	39.8	124	0.17	126	0
1922	61	18	76.9	16	45.2	40	0.85	85	0
1921	51.9	120	64.1	119	39.7	125	1.40	60	0
1920	59.2	38	73.7	37	44.7	49	0.72	94	0
1919	58.3	53	75.4	25	41.2	112	0.81	88	0
1918	57.5	63	74.2	33	40.8	118	2.02	30	0
1917	57.9	58	72.7	45	43.2	71	1.90	35	2
1916	56.2	80	69.9	76	42.5	91	1.50	55	0
1915	52.8	114	63.9	120	41.7	105	3.22	6	0
1914	58.8	44	72.7	45	44.8	48	1.15	71	0
1913	59.3	36	76	20	42.7	79	0.97	81	0
1912	51.4	124	61.5	124	41.3	110	2.10	27	0
1911	53.4	113	64.3	117	42.5	91	2.18	25	0
1910	55.7	92	67	99	44.4	54	3.35	4	0
1909	59.6	32	72	52	47.2	15	2.85	8	0
1908	59.6	32	72.9	44	46.3	24	2.58	10	0
1907	53.7	111	65.3	112	42	100	0.25	120	0
1906	60.1	25	72	52	48.2	7	0.63	99	0
1905	59.6	32	72	52	47.1	17	0.18	125	0
1904	57.8	59	72.2	47	43.3	67	0.14	128	0
1903	56.1	82	68.7	84	43.5	63	0.99	79	0
1902	56.2	80	70.1	74	42.3	96	0.74	91	0
1901	51.9	120	61.7	123	42	100	1.89	37	0
1900	54.1	104	64.4	116	43.8	58	1.17	68	0
1899	59.7	31	73.2	40	46.3	24	0.76	89	0
1898	56.6	73	67.8	90	45.3	37	1.72	45	0
1897					43.1	73	1.04	75	5
1896					40.8	118	2.06	28	11
1895					42.3	96	0.02	133	7
1894	54	106	65.2	114	42.7	79	0.52	104	0
1893					39.6	126	1.92	34	14
1892					38.4	131	0.08	132	18

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1938	65.5
1966	64.2
1963	64
2009	63.6
2025	63.5
1998	63.1
1979	62.9
1967	62.8
2024	62.6
1990	62.4
More years share the last value

Coldest
Year	Mean, °F
1965	45
1985	48.2
1926	48.4
1961	50.2
1986	51.4
1912	51.4
1984	51.8
1941	51.8
1921	51.9
1901	51.9

Wettest
Year	Precipitation, in
1941	3.56
1925	3.52
1926	3.42
1910	3.35
1985	3.23
1915	3.22
1968	2.92
1909	2.85
1945	2.60
1908	2.58

Driest
Year	Precipitation, in
2012	trace
1932	trace
1895	0.02
1892	0.08
1990	0.09
1962	0.10
1969	0.13
1904	0.14
1955	0.16
1923	0.17

The hottest, coldest and wettest days

Hottest day: 88°F; 25 September 2026
Coldest night: 28°F; 27 September 2026
Wettest day: 0.48 in; 7 September 2026

Every month, season and year

Months

Seasons

Years

Great Falls, MT the day's answers

All-time records

Every answer in words

September 2026 brought 1.00 in of precipitation in Great Falls, MT, the driest September since 2025, tied 58th driest of 135 (with 1998 and 1991).
The hottest day of September 2026 in Great Falls, MT: 88°F on Friday 25 September 2026.
The coldest night of September 2026 in Great Falls, MT: a low of 28°F on Sunday 27 September 2026.
The wettest day of September 2026 in Great Falls, MT: 0.48 in on Monday 7 September 2026.