Bismarck, ND: September

30 September 2026: September 2026 averaged 64°F in Bismarck, ND, the warmest September since 2025, 9th warmest of 152.

September 2026

Mean temperature: 64°F; Warmest since 2025; 9th warmest of 152
Precipitation: 2.49 in; Wettest since 2025; 21st wettest of 152

A normal September in Bismarck, ND (1991 to 2020): a mean temperature of 60°F, between 56.5°F and 63.4°F in eight years of ten and 1.30 in of precipitation, between 0.36 in and 3.68 in in eight years of ten.

The mean temperature of every September in Bismarck, ND since 1875: 64°F in 2026; the highest is 67.3°F, in 2024.

Normal range, 56.5 to 63.4°F

Every year, ranked, as a table

Every September in Bismarck, ND from 1875 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	64	9	75.5	30	52.5	1	2.49	21
2025	64.3	8	77.1	15	51.4	3	4.14	8
2024	67.3	1	83.6	1	50.9	7	0.21	144
2023	63.6	12	76.1	25	51.1	5	2.99	13
2022	63.5	14	78.4	10	48.6	20	0.97	88
2021	65.1	3	80.6	4	49.6	12	1.06	81
2020	60	52	74.1	50	45.9	55	0.50	117
2019	60.4	40	70.7	89	50.2	9	5.74	2
2018	57.9	81	69.1	114	46.6	45	2.28	30
2017	60.4	40	73.8	51	46.9	40	1.39	61
2016	60	52	72.2	73	47.7	31	1.22	72
2015	64.4	7	80.2	6	48.5	21	0.37	129
2014	60.2	46	74.3	42	46.1	51	0.37	129
2013	63.8	11	76.5	23	51.2	4	4.36	6
2012	59	64	77.3	13	40.7	142	0.05	150
2011	57.7	85	72.4	70	42.9	117	0.96	89
2010	56.2	116	67.9	126	44.6	84	3.60	11
2009	65	4	78.9	8	51	6	1.24	70
2008	59	64	72.8	65	45.2	72	2.46	23
2007	59.5	57	73.4	56	45.6	63	1.77	42
2006	57	99	69.3	110	44.6	84	1.74	45
2005	61.3	30	77.3	13	45.4	69	0.26	139
2004	61.1	31	73.8	51	48.4	23	2.08	35
2003	60.1	49	74.2	46	46.1	51	1.77	42
2002	61.4	29	74.6	38	48.2	26	0.62	110
2001	61	32	74.3	42	47.8	30	1.06	81
2000	59.7	55	74.7	37	44.7	80	0.98	85
1999	55	129	65.9	139	44	92	1.31	65
1998	63.4	16	78.2	11	48.7	19	0.98	85
1997	62.1	20	76.9	16	47.3	35	1.73	47
1996	58	78	70.2	97	45.8	57	2.80	17
1995	57.2	95	71.9	76	42.5	123	0.80	97
1994	61.6	27	76	26	47.2	36	5.01	4
1993	53.2	142	67.1	133	39.3	149	0.26	139
1992	56.5	108	71.8	79	41.2	137	1.28	67
1991	58.9	68	71.8	79	46	53	2.49	21
1990	61.7	25	76.7	17	46.7	43	1.25	69
1989	58.6	71	73.7	55	43.5	107	1.23	71
1988	56.5	108	71.9	76	41.2	137	0.63	109
1987	58.6	71	73.2	60	44.1	90	0.29	136
1986	54.3	137	63	151	45.5	65	4.41	5
1985	53.6	141	63.5	149	43.7	100	1.29	66
1984	52.6	149	65.8	140	39.4	148	0.94	90
1983	56.3	112	69.3	110	43.2	111	1.03	83
1982	56.7	105	71.1	84	42.3	127	0.45	122
1981	59.2	60	73	63	45.5	65	1.88	39
1980	58.1	76	71	86	45.1	73	1.11	78
1979	59.4	58	74.8	36	43.9	95	0.82	96
1978	61.8	21	76.7	17	46.8	41	1.80	41
1977	57	99	67.3	132	46.6	45	6.93	1
1976	60.1	49	78.7	9	41.5	133	1.59	55
1975	55	129	69.5	106	40.5	144	0.57	113
1974	52.9	145	69.2	113	36.5	151	0.23	142
1973	54.6	134	67.6	128	41.5	133	2.32	27
1972	57	99	70	99	44	92	0.29	136
1971	56.8	102	69.4	108	44.1	90	1.63	53
1970	58	78	72.4	70	43.7	100	1.47	58
1969	61.8	21	76.7	17	47	39	0.49	118
1968	57.5	90	70.4	93	44.6	84	1.20	73
1967	60.4	40	74.2	46	46.6	45	2.09	34
1966	58.7	70	74.2	46	43.1	112	0.86	93
1965	46.2	152	57.2	152	35.3	152	3.02	12
1964	53.9	138	69.1	114	38.7	150	0.66	107
1963	60.9	35	76	26	45.8	57	0.72	102
1962	57.6	87	73.4	56	41.8	130	0.79	98
1961	52.4	151	64.5	145	40.2	145	2.81	15
1960	59.4	58	75.1	34	43.8	96	0.29	136
1959	57.1	97	69.6	103	44.6	84	1.57	56
1958	60.2	46	74.9	35	45.5	65	0.41	124
1957	56.1	118	70.1	98	42.1	129	0.74	101
1956	55.5	126	70	99	41	139	0.55	114
1955	57.9	81	72.8	65	43	113	2.26	31
1954	56.8	102	68.2	123	45.3	71	2.69	19
1953	59	64	74.2	46	43.8	96	0.42	123
1952	63.2	17	79.5	7	46.8	41	0.40	126
1951	54.4	135	66	138	42.9	117	0.76	99
1950	58.9	68	71.4	83	46.3	50	1.70	48
1949	56.3	112	71.9	76	40.8	141	0.54	115
1948	64.8	5	80.9	3	48.8	17	0.02	152
1947	57.1	97	70.6	90	43.5	107	1.50	57
1946	58.1	76	70.8	87	45.4	69	2.23	33
1945	55.6	124	68.6	121	42.6	121	1.99	37
1944	57.4	91	69.1	114	45.7	61	1.34	64
1943	57.4	91	72	75	42.7	120	0.23	142
1942	55.2	128	67.5	129	42.8	119	2.08	35
1941	57.3	93	68.5	122	46	53	3.91	9
1940	64.5	6	80.6	4	48.3	24	1.38	62
1939	60.1	49	74.5	40	45.8	57	0.24	141
1938	63.6	12	76.4	24	50.7	8	1.11	78
1937	60.3	43	72.8	65	47.9	29	1.19	75
1936	61.7	25	75.4	31	48	27	1.66	52
1935	60.3	43	74.6	38	45.9	55	0.38	127
1934	52.7	148	64.6	144	40.7	142	0.54	115
1933	62.9	18	76.6	22	49.2	13	0.37	129
1932	58.3	75	73	63	43.7	100	0.33	133
1931	63.5	14	76.7	17	50.2	9	2.81	15
1930	57.7	85	70.3	94	45.1	73	2.70	18
1929	53.1	144	63.6	147	42.6	121	1.69	49
1928	56.2	116	69	117	43.3	110	1.15	77
1927	58.5	74	70.6	90	46.5	48	0.47	120
1926	53.7	140	65.6	141	41.8	130	2.31	28
1925	59.8	54	71.6	81	48	27	0.85	94
1924	57.3	93	69.6	103	44.9	76	1.60	54
1923	61	32	73.1	62	48.9	15	2.83	14
1922	61.5	28	74.4	41	48.5	21	1.93	38
1921	59.2	60	70.8	87	47.6	33	1.67	51
1920	60.3	43	73.4	56	47.2	36	1.20	73
1919	61	32	73.2	60	48.9	15	0.34	132
1918	53.9	138	67.9	126	39.9	147	0.47	120
1917	57.6	87	70.3	94	44.9	76	1.75	44
1916	56.8	102	70	99	43.6	105	0.70	104
1915	56	119	66.8	135	45.1	73	1.68	50
1914	60.9	35	75.2	33	46.7	43	1.10	80
1913	59	64	73.3	59	44.7	80	2.29	29
1912	52.5	150	63.6	147	41.5	133	2.42	24
1911	56.5	108	68.1	124	44.9	76	2.26	31
1910	56.3	112	68.9	119	43.7	100	2.66	20
1909	60.7	37	75.6	29	45.8	57	0.83	95
1908	62.9	18	76.7	17	49	14	0.59	112
1907	52.8	146	65.4	142	40.2	145	1.19	75
1906	63.9	10	77.9	12	49.8	11	0.60	111
1905	61.8	21	75.8	28	47.7	31	0.94	90
1904	56.6	107	69.5	106	43.8	96	1.03	83
1903	52.8	146	63.2	150	42.4	125	2.36	25
1902	55.7	123	70.3	94	41	139	0.41	124
1901	54.8	132	65.1	143	44.4	88	1.47	58
1900	55.9	121	66.1	137	45.6	63	4.27	7
1899	58	78	72.4	70	43.6	105	0.06	149
1898	58.6	71	72.5	69	44.7	80	0.76	99
1897	67.1	2	82.6	2	51.6	2	0.30	135
1896	54.4	135	67.5	129	41.4	136	1.42	60
1895	59.1	62	74.3	42	43.8	96	0.67	105
1894	57.9	81	71.1	84	44.7	80	3.83	10
1893	59.7	55	73.8	51	45.7	61	0.18	145
1892	60.2	46	72.8	65	47.6	33	0.66	107
1891	61.8	21	75.4	31	48.3	24	0.87	92
1890	56.3	112	70.5	92	42.2	128	0.98	85
1889	55.9	121	68.8	120	43	113	0.48	119
1888	59.1	62	74.3	42	44	92	0.33	133
1887	57.6	87	69.7	102	45.5	65	1.35	63
1886	56	119	69	117	43	113	0.38	127
1885	57.9	81	71.5	82	44.3	89	0.14	146
1884	56.7	105	66.9	134	46.5	48	2.34	26
1883	56.5	108	69.4	108	43.7	100	0.04	151
1882	60.5	38	72.1	74	48.8	17	1.74	45
1881	53.2	142	64	146	42.4	125	1.26	68
1880	55.6	124	68.1	124	43	113	0.72	102
1879	55.5	126	69.3	110	41.7	132	0.07	148
1878	55	129	67.5	129	42.5	123	0.67	105
1877	60.5	38	73.8	51	47.2	36	0.11	147
1876	54.8	132	66.2	136	43.4	109	5.61	3
1875	57.2	95	69.6	103	44.8	79	1.85	40

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2024	67.3
1897	67.1
2021	65.1
2009	65
1948	64.8
1940	64.5
2015	64.4
2025	64.3
2026	64
1906	63.9

Coldest
Year	Mean, °F
1965	46.2
1961	52.4
1912	52.5
1984	52.6
1934	52.7
1907	52.8
1903	52.8
1974	52.9
1929	53.1
1993	53.2
More years share the last value

Wettest
Year	Precipitation, in
1977	6.93
2019	5.74
1876	5.61
1994	5.01
1986	4.41
2013	4.36
1900	4.27
2025	4.14
1941	3.91
1894	3.83

Driest
Year	Precipitation, in
1948	0.02
1883	0.04
2012	0.05
1899	0.06
1879	0.07
1877	0.11
1885	0.14
1893	0.18
2024	0.21
1974	0.23
More years share the last value

The hottest, coldest and wettest days

Hottest day: 96°F; 5 September 2026
Coldest night: 39°F; 16 September 2026
Wettest day: 1.07 in; 29 September 2026

Every month, season and year

Months

Seasons

Years

Bismarck, ND the day's answers

All-time records

Every answer in words

September 2026 brought 2.49 in of precipitation in Bismarck, ND, the wettest September since 2025, tied 21st wettest of 152 (with 1991).
The hottest day of September 2026 in Bismarck, ND: 96°F on Saturday 5 September 2026.
The coldest night of September 2026 in Bismarck, ND: a low of 39°F on Wednesday 16 September 2026.
The wettest day of September 2026 in Bismarck, ND: 1.07 in on Tuesday 29 September 2026.