Helena, MT: September

30 September 2026: September 2026 averaged 59.9°F in Helena, MT, the warmest September since 2025, tied 25th warmest of 147 (with 1987).

September 2026

Mean temperature: 59.9°F; Warmest since 2025; 25th warmest of 147
Precipitation: 1.38 in; Wettest since 2023; 49th wettest of 146

A normal September in Helena, MT (1991 to 2020): a mean temperature of 58.6°F, between 55.8°F and 61.6°F in eight years of ten and 0.90 in of precipitation, between 0.09 in and 1.78 in in eight years of ten.

The mean temperature of every September in Helena, MT since 1880: 59.9°F in 2026; the highest is 64.6°F, in 2001.

Normal range, 55.8 to 61.6°F

Every year, ranked, as a table

Every September in Helena, MT from 1880 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
2026	59.9	25	73.1	35	46.8	18	1.38	49
2025	63.5	7	78.8	7	48.2	9	0.60	98
2024	64.3	2	78.7	9	49.9	2	1.23	56
2023	61.9	11	75.3	23	48.5	8	2.70	8
2022	64.2	3	78.9	5	49.5	3	1.95	27
2021	62.2	10	78.8	7	45.7	30	0.03	142
2020	61.3	18	76.7	18	45.8	27	0.25	124
2019	59.1	34	70.4	71	47.8	11	3.03	4
2018	57.1	66	70.6	67	43.5	73	0.76	84
2017	58	48	71.7	51	44.2	57	1.92	29
2016	58.2	46	70.8	62	45.6	33	0.97	69
2015	60.3	24	74.8	25	45.8	27	2.08	25
2014	58.9	37	72.7	42	45	42	1.10	64
2013	61.6	14	74.4	27	48.8	7	1.46	42
2012	61.6	14	78.2	14	45	42	0.00	146
2011	61.5	17	78.4	12	44.5	52	0.04	141
2010	57.2	65	70.6	67	43.8	61	0.83	77
2009	64.1	5	81	2	47.2	15	0.97	69
2008	56.8	72	71.8	49	41.8	97	0.70	90
2007	58.3	45	72.9	37	43.7	69	1.69	37
2006	59.2	32	73.6	31	44.8	48	1.17	59
2005	58	48	72.7	42	43.3	75	0.72	87
2004	56.3	84	68.1	102	44.4	53	1.76	34
2003	59.3	31	72.8	39	45.7	30	0.74	85
2002	59.1	34	71.9	48	46.2	24	1.22	57
2001	64.6	1	80.2	3	48.9	5	1.38	49
2000	56.4	79	70.4	71	42.3	90	0.54	103
1999	52.9	125	68.9	89	36.9	141	0.54	103
1998	61.9	11	78.4	12	45.4	37	0.82	78
1997	58.8	38	76.1	20	41.4	108	0.31	120
1996	55.5	95	69.8	80	41.1	112	0.51	106
1995	55.8	93	71	58	40.5	122	1.59	39
1994	61.6	14	79.6	4	43.6	72	0.09	137
1993	53.9	114	68.1	102	39.8	128	1.25	55
1992	56.7	75	72	47	41.4	108	0.09	137
1991	58.4	43	72.9	37	43.9	60	1.26	54
1990	63.6	6	81.3	1	45.9	26	0.11	134
1989	55.6	94	71.2	53	40	127	1.31	51
1988	56.4	79	71.2	53	41.5	105	2.09	24
1987	59.9	25	77.2	16	42.6	87	0.80	82
1986	51.1	134	60.6	141	41.7	100	2.45	15
1985	49.6	143	59.8	142	39.3	134	2.11	23
1984	52.3	127	65.2	123	39.4	133	0.73	86
1983	53.5	120	66	117	40.9	114	1.56	41
1982	55.5	95	68.9	89	42	93	2.74	6
1981	58.8	38	74.8	25	42.7	85	0.90	71
1980	56.8	72	69.7	82	43.8	61	2.57	11
1979	61.3	18	78.7	9	43.8	61	0.12	133
1978	57.9	51	72.1	46	43.7	69	1.11	63
1977	56.3	84	70.9	60	41.6	103	1.93	28
1976	57.8	53	73.1	35	42.6	87	1.82	31
1975	54	113	69.9	79	38.2	139	0.47	109
1974	53.5	120	68.8	92	38.1	140	0.22	126
1973	54.3	112	68.2	101	40.5	122	0.43	111
1972	50.8	137	65	124	36.7	142	0.08	139
1971	49.7	141	63.2	130	36.1	145	0.89	74
1970	51.1	134	66.2	116	36	146	0.36	114
1969	58	48	73.5	32	42.5	89	0.33	119
1968	55	102	68.4	100	41.5	105	2.22	20
1967	61.9	11	78.7	9	45.1	41	0.68	91
1966	62.7	8	78.9	5	46.5	22	0.34	116
1965	45.6	147	56.1	147	35	147	3.37	2
1964	53.7	118	67.4	109	40.1	126	0.16	128
1963	61.2	20	76.8	17	45.6	33	1.10	64
1962	55	102	70.2	74	39.7	131	0.31	120
1961	48.9	145	61.4	139	36.4	144	1.16	60
1960	57	67	73.2	34	40.8	117	0.13	132
1959	53.7	118	66.8	112	40.6	121	0.46	110
1958	56.5	78	70.7	64	42.3	90	0.42	112
1957	56.2	88	71.1	56	41.3	111	1.85	30
1956	57.6	59	74.2	28	41	113	0.16	128
1955	54.6	108	68.5	98	40.7	120	0.24	125
1954	55.3	97	69.8	80	40.9	114	0.65	95
1953	59.2	32	76.1	20	42.3	90	0.34	116
1952	59	36	76.5	19	41.5	105	0.18	127
1951	51.9	130	64.6	125	39.2	135	0.81	80
1950	53.9	114	67.1	111	40.8	117	0.99	68
1949	55	102	70.1	77	39.8	128	1.08	67
1948	56.8	72	72.8	39	40.8	117	0.31	120
1947	56.1	90	68.7	94	43.4	74	3.05	3
1946	54.7	106	67.8	104	41.7	100	2.51	13
1945	53.3	123	67.3	110	39.2	135	1.46	42
1944	56.3	84	70.7	64	41.8	97	0.82	78
1943	57.6	59	74.9	24	40.3	125	0.78	83
1942	56	91	70.2	74	41.8	97	0.66	92
1941	50.4	140	62	135	38.9	137	2.27	17
1940	60.4	23	73.3	33	47.5	13	2.00	26
1939	57.4	63	70.6	67	44.3	55	0.89	74
1938	64.2	3	77.8	15	50.5	1	0.72	87
1937	58.7	41	70.7	64	46.6	21	2.25	18
1936	56.4	79	68.6	96	44.2	57	0.90	71
1935	58.7	41	72.2	45	45.3	40	0.11	134
1934	51.8	132	63.1	131	40.4	124	0.63	97
1933	55	102	66.8	112	43.2	76	0.66	92
1932	58.4	43	71.8	49	44.9	45	trace	144
1931	56.7	75	67.6	106	45.7	30	1.18	58
1930	57.7	56	69.2	85	46.2	24	1.12	62
1929	50.7	139	61.9	137	39.5	132	1.57	40
1928	56.2	88	69.1	86	43.2	76	0.05	140
1927	54.4	111	65.6	120	43.1	80	0.55	102
1926	46.4	146	56.3	146	36.5	143	2.72	7
1925	53.5	120	63.9	127	43.2	76	3.03	4
1924	57.3	64	70.8	62	43.8	61	1.15	61
1923	58.2	46	71	58	45.5	35	0.16	128
1922	60.6	22	74.1	29	47.2	15	0.54	103
1921	50.8	137	60.8	140	40.9	114	1.09	66
1920	56.9	71	68.9	89	44.9	45	1.39	47
1919	57	67	68.7	94	45.4	37	0.57	100
1918	56	91	67.6	106	44.3	55	1.76	34
1917	57.7	56	70.6	67	44.7	51	1.45	45
1916	55.3	97	67.8	104	42.7	85	1.69	37
1915	52	129	61.9	137	42	93	2.13	22
1914	56.4	79	68.8	92	44	59	1.46	42
1913	57.8	53	71.2	53	44.4	53	0.36	114
1912	49	144	59.4	143	38.7	138	1.73	36
1911	51.2	133	62.6	134	39.8	128	2.24	19
1910	52.2	128	62.8	132	41.6	103	1.77	33
1909	56.3	84	66.7	115	45.8	27	2.14	21
1908	57.5	61	69.4	83	45.5	35	1.81	32
1907	54.5	110	66	117	42.9	82	0.81	80
1906	57.9	51	70.9	60	44.8	48	1.29	53
1905	59.4	30	71.5	52	47.2	15	0.34	116
1904	59.6	28	72.8	39	46.3	23	0.01	143
1903	54.7	106	65.5	121	43.8	61	0.90	71
1902	55.3	97	67.6	106	43	81	0.39	113
1901	49.7	141	57.9	145	41.4	108	2.63	10
1900	53	124	62.8	132	43.2	76	1.39	47
1899	59.8	27	72.4	44	47.3	14	0.64	96
1898	56.7	75	68.5	98	44.9	45	0.87	76
1897	57.8	53	70.3	73	45.4	37	0.66	92
1896	51.9	130	62	135	41.7	100	2.54	12
1895	52.7	126	63.4	129	42	93	0.57	100
1894	53.9	114	64.1	126	43.8	61	1.42	46
1893	54.6	108	65.3	122	43.8	61	2.69	9
1892	60.8	21	73.8	30	47.8	11	0.26	123
1891	57.7	56	68.6	96	46.7	19	0.72	87
1890	57.5	61	70	78	45	42	0.58	99
1889	55.3	97	66.8	112	43.7	69	0.48	108
1888	62.6	9	76.1	20	49.1	4	0.14	131
1887	56.4	79	69	88	43.8	61	0.50	107
1886	53.8	117	65.7	119	42	93	2.40	16
1885	57	67	69.1	86	44.8	48	0.11	134
1884	51.1	134	59.4	143	42.8	83	1.30	52
1883	58.8	38	69.3	84	48.2	9
1882	59.5	29	70.2	74	48.9	5	3.66	1
1881	55.1	101	63.5	128	46.7	19	2.49	14
1880	57	67	71.1	56	42.8	83	trace	144

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2001	64.6
2024	64.3
2022	64.2
1938	64.2
2009	64.1
1990	63.6
2025	63.5
1966	62.7
1888	62.6
2021	62.2

Coldest
Year	Mean, °F
1965	45.6
1926	46.4
1961	48.9
1912	49
1985	49.6
1971	49.7
1901	49.7
1941	50.4
1929	50.7
1972	50.8
More years share the last value

Wettest
Year	Precipitation, in
1882	3.66
1965	3.37
1947	3.05
2019	3.03
1925	3.03
1982	2.74
1926	2.72
2023	2.70
1893	2.69
1901	2.63

Driest
Year	Precipitation, in
2012	0.00
1932	trace
1880	trace
1904	0.01
2021	0.03
2011	0.04
1928	0.05
1972	0.08
1994	0.09
1992	0.09

The hottest, coldest and wettest days

Hottest day: 87°F; 10 September 2026
Coldest night: 34°F; 27 September 2026
Wettest day: 0.56 in; 19 September 2026

Every month, season and year

Months

Seasons

Years

Helena, MT the day's answers

All-time records

Every answer in words

September 2026 brought 1.38 in of precipitation in Helena, MT, the wettest September since 2023, tied 49th wettest of 146 (with 2001).
The hottest day of September 2026 in Helena, MT: 87°F on Thursday 10 September 2026.
The coldest night of September 2026 in Helena, MT: a low of 34°F on Sunday 27 September 2026.
The wettest day of September 2026 in Helena, MT: 0.56 in on Saturday 19 September 2026.