Indianapolis, IN: September

30 September 2026: September 2026 averaged 73.8°F in Indianapolis, IN, the warmest September on record, in 156 years since 1871; provisional.

September 2026

Mean temperature: 73.8°F; Warmest on record; Warmest of 156, provisional
Precipitation: 1.29 in; Driest since 2020; 32nd driest of 156

A normal September in Indianapolis, IN (1991 to 2020): a mean temperature of 67.8°F, between 64.7°F and 71.3°F in eight years of ten and 2.36 in of precipitation, between 0.55 in and 5.88 in in eight years of ten.

The mean temperature of every September in Indianapolis, IN since 1871: 73.8°F in 2026, the highest of them all.

Normal range, 64.7 to 71.3°F

Every year, ranked, as a table

Every September in Indianapolis, IN from 1871 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	73.8	1	83.1	5	64.5	1	1.29	125
2025	70.5	26	81.8	20	59.2	46	1.77	112
2024	70.9	19	81.4	23	60.4	21	1.52	119
2023	69.9	36	80.3	37	59.4	40	1.60	116
2022	68.1	60	77.7	73	58.5	56	2.12	99
2021	70.2	33	80.1	40	60.2	25	5.25	23
2020	67.8	67	78.3	66	57.2	72	0.12	156
2019	73.7	2	84.2	3	63.1	6	0.47	153
2018	71.3	15	80	45	62.6	8	5.46	19
2017	69.8	39	80.6	33	59	49	0.66	149
2016	71.3	15	81	27	61.6	12	4.67	29
2015	70.5	26	81	27	60.1	27	1.70	115
2014	65.4	109	75.6	108	55.3	104	2.53	81
2013	69.5	46	80.1	40	58.9	50	2.86	72
2012	65.2	113	74.3	129	56.1	91	7.73	5
2011	66	98	74.5	127	57.4	69	5.37	20
2010	70.5	26	82.6	9	58.3	59	0.56	151
2009	68.5	56	77.3	77	59.6	37	1.86	108
2008	70.1	34	80.1	40	60.1	27	2.04	102
2007	71.7	9	82.7	7	60.6	18	1.59	117
2006	64.1	137	72.9	142	55.3	104	3.53	48
2005	70.5	26	80.4	36	60.6	18	4.67	29
2004	69	52	79.4	53	58.7	54	0.75	145
2003	64.6	125	74.2	130	55	110	10.37	1
2002	71.3	15	82.1	16	60.4	21	3.70	46
2001	65.1	117	75.4	114	54.8	115	4.66	32
2000	65.2	113	75.5	112	54.8	115	4.82	27
1999	67.1	80	81.2	25	52.9	140	0.75	145
1998	71.4	12	83	6	59.8	31	0.48	152
1997	66.1	96	77.1	85	55	110	1.51	121
1996	65.5	107	75.5	112	55.5	101	7.61	6
1995	64.7	124	76.1	96	53.3	136	1.27	127
1994	66.4	90	77.3	77	55.6	96	2.19	95
1993	62.1	150	71.7	150	52.6	144	5.69	15
1992	65.1	117	75.4	114	54.8	115	3.40	54
1991	67.8	67	80.6	33	55.1	108	1.12	135
1990	66.9	84	77.1	85	56.7	81	2.68	79
1989	64.4	131	74.1	133	54.6	123	8.06	4
1988	67.3	77	79	60	55.6	96	1.14	133
1987	68.1	60	80.8	30	55.4	103	1.41	123
1986	69.8	39	80.5	35	59.1	48	5.68	16
1985	66.2	95	77.1	85	55.3	104	2.71	77
1984	64.2	135	74.9	120	53.5	135	4.69	28
1983	69.4	47	82.4	11	56.3	87	1.28	126
1982	64.4	131	74.8	123	53.9	132	1.20	130
1981	64.6	125	74.6	126	54.5	125	2.04	102
1980	67.9	65	79.3	55	56.5	84	3.31	59
1979	64.9	122	77.3	77	52.5	146	0.36	154
1978	70.3	31	82.3	13	58.4	58	0.85	142
1977	69.6	44	79.8	50	59.4	40	3.40	54
1976	63.5	141	76.1	96	51	150	2.02	106
1975	62.6	147	72.4	148	52.7	142	2.32	90
1974	60.6	154	70.5	154	50.7	153	3.25	62
1973	69.8	39	80	45	59.7	33	2.43	83
1972	68.3	58	77.2	83	59.4	40	5.65	17
1971	69.4	47	79.1	59	59.6	37	3.10	64
1970	69.1	51	80.7	31	57.5	67	2.41	86
1969	65.1	117	75.9	102	54.4	129	2.89	71
1968	65.8	104	76.5	92	55	110	1.54	118
1967	65.9	101	77.7	73	54	131	0.80	143
1966	65.2	113	75.8	107	54.5	125	5.73	14
1965	67.5	71	76.6	91	58.3	59	5.16	24
1964	67.2	78	79.8	50	54.5	125	1.27	127
1963	65.4	109	78.9	61	51.8	149	0.24	155
1962	62.6	147	72.6	146	52.6	144	4.13	40
1961	70.9	19	82.5	10	59.3	45	4.40	36
1960	69.8	39	80.7	31	58.9	50	2.43	83
1959	68.4	57	79.9	48	56.9	77	2.33	89
1958	65.4	109	74.8	123	56.1	91	3.35	56
1957	64.6	125	74.5	127	54.7	121	2.22	94
1956	63.8	139	76.8	90	50.8	151	1.07	136
1955	68.9	54	81.8	20	55.9	93	6.01	12
1954	69.6	44	82.3	13	56.8	78	0.96	139
1953	67.2	78	81.2	25	53.1	138	1.44	122
1952	66	98	79.2	57	52.8	141	4.62	33
1951	62.6	147	74.8	123	50.3	154	2.39	87
1950	64.6	125	74.1	133	55.1	108	4.96	26
1949	60.6	154	72.1	149	49.1	156	2.52	82
1948	67.4	75	78.3	66	56.4	86	3.03	66
1947	66.4	90	77.2	83	55.6	96	3.45	51
1946	66.3	93	79.3	55	53.2	137	1.00	138
1945	67.5	71	77.1	85	57.8	64	5.61	18
1944	66	98	77.3	77	54.8	115	2.31	91
1943	61.9	151	73.6	137	50.1	155	3.26	61
1942	66.3	93	76	98	56.6	82	3.46	50
1941	71.8	8	82.7	7	60.9	17	1.94	107
1940	66.8	85	77.7	73	55.8	95	1.06	137
1939	72.4	7	84.8	1	59.9	30	1.17	132
1938	68.9	54	78.3	66	59.4	40	1.74	114
1937	65.4	109	75.2	116	55.6	96	3.28	60
1936	70.9	19	80.1	40	61.7	11	4.30	37
1935	67.7	70	77.6	76	57.7	65	3.98	41
1934	66.5	88	75.6	108	57.4	69	4.54	34
1933	73.2	3	82.4	11	63.9	4	5.27	22
1932	66.7	86	75.9	102	57.5	67	7.18	10
1931	72.7	6	81.8	20	63.7	5	3.66	47
1930	69.2	50	78.8	63	59.7	33	2.86	72
1929	66.5	88	75.2	116	57.7	65	2.03	105
1928	63	145	72.9	142	53	139	0.92	140
1927	71.4	12	81	27	61.8	10	2.70	78
1926	67.8	67	75.9	102	59.7	33	9.33	2
1925	73.2	3	82.3	13	64.2	3	5.89	13
1924	61.7	152	70.7	153	52.7	142	2.80	75
1923	67	82	75.1	118	58.9	50	3.91	43
1922	71.3	15	82.1	16	60.4	21	1.52	119
1921	70.7	24	79.2	57	62.3	9	7.54	7
1920	69.4	47	78.9	61	59.8	31	2.37	88
1919	70.3	31	80.2	39	60.4	21	1.86	108
1918	59.7	156	68.7	156	50.8	151	5.14	25
1917	65.2	113	75.6	108	54.7	121	2.93	70
1916	65.5	107	76	98	54.9	114	2.26	93
1915	68.1	60	77.3	77	58.9	50	4.17	39
1914	66.4	90	75.9	102	57	75	2.15	96
1913	65.9	101	75.6	108	56.3	87	3.02	68
1912	68.1	60	78	70	58.2	61	3.44	52
1911	69.9	36	78.3	66	61.5	14	4.67	29
1910	68.1	60	76.5	92	59.6	37	3.34	58
1909	64.3	134	74.2	130	54.4	129	2.15	96
1908	71.6	10	83.5	4	59.7	33	1.14	133
1907	66.1	96	74.9	120	57.2	72	2.31	91
1906	70.5	26	79.9	48	61	15	4.50	35
1905	67.9	65	77.1	85	58.7	54	2.13	98
1904	67.1	80	76.2	95	57.9	63	3.96	42
1903	67	82	77.3	77	56.6	82	1.18	131
1902	64.4	131	73.6	137	55.2	107	5.33	21
1901	67.5	71	77.8	72	57.1	74	0.66	149
1900	70.8	22	80	45	61.6	12	2.95	69
1899	65.7	106	75.9	102	55.5	101	2.54	80
1898	70.1	34	79.7	52	60.5	20	4.23	38
1897	71.4	12	84.6	2	58.2	61	0.79	144
1896	64.1	137	73.1	140	55	110	8.17	3
1895	70.8	22	81.3	24	60.2	25	7.46	8
1894	69.8	39	80.3	37	59.2	46	1.82	111
1893	69	52	79.4	53	58.5	56	3.03	66
1892	67.5	71	78.7	64	56.2	90	2.42	85
1891	70.6	25	81.9	18	59.4	40	0.74	147
1890	62.9	146	71.2	152	54.6	123	7.31	9
1889	64.5	129	74.2	130	54.8	115	3.79	45
1888	63.2	144	74	135	52.4	147	1.23	129
1887	65.8	104	76	98	55.6	96	2.11	100
1886	67.4	75	77.9	71	56.8	78	3.43	53
1885	64.8	123	74.9	120	54.8	115	3.50	49
1884	71.5	11	80.1	40	63	7	3.09	65
1883	63.4	142	72.9	142	53.9	132	2.72	76
1882	65.1	117	73.9	136	56.3	87	0.72	148
1881	73.1	5	81.9	18	64.3	2	3.25	62
1880	65	121	73.5	139	56.5	84	1.86	108
1879	60.9	153	69.8	155	52.1	148	6.94	11
1878	66.7	86	76	98	57.4	69	3.35	56
1877	65.9	101	75.1	118	56.8	78	2.04	102
1876	64.2	135	71.4	151	57	75	3.85	44
1875	63.3	143	72.6	146	53.9	132	1.34	124
1874	69.9	36	78.7	64	61	15	2.09	101
1873	64.5	129	73	141	55.9	93	1.76	113
1872	68.2	59	76.3	94	60.1	27	2.81	74
1871	63.7	140	72.9	142	54.5	125	0.89	141

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2026	73.8
2019	73.7
1933	73.2
1925	73.2
1881	73.1
1931	72.7
1939	72.4
1941	71.8
2007	71.7
1908	71.6

Coldest
Year	Mean, °F
1918	59.7
1974	60.6
1949	60.6
1879	60.9
1924	61.7
1943	61.9
1993	62.1
1975	62.6
1962	62.6
1951	62.6

Wettest
Year	Precipitation, in
2003	10.37
1926	9.33
1896	8.17
1989	8.06
2012	7.73
1996	7.61
1921	7.54
1895	7.46
1890	7.31
1932	7.18

Driest
Year	Precipitation, in
2020	0.12
1963	0.24
1979	0.36
2019	0.47
1998	0.48
2010	0.56
2017	0.66
1901	0.66
1882	0.72
1891	0.74

The hottest, coldest and wettest days

Hottest day: 97°F; 4 September 2026
Coldest night: 49°F; 27 September 2026
Wettest day: 0.64 in; 21 September 2026

Every month, season and year

Months

Seasons

Years

Indianapolis, IN the day's answers

All-time records

Every answer in words

September 2026 brought 1.29 in of precipitation in Indianapolis, IN, the driest September since 2020, 32nd driest of 156.
The hottest day of September 2026 in Indianapolis, IN: 97°F on Friday 4 September 2026.
The coldest night of September 2026 in Indianapolis, IN: a low of 49°F on Sunday 27 September 2026.
The wettest day of September 2026 in Indianapolis, IN: 0.64 in on Monday 21 September 2026.