St Louis, MO: September

30 September 2026: September 2026 averaged 78.4°F in St Louis, MO, the warmest September on record, in 152 years since 1874 (1895 excluded: 4 of 30 days missing); provisional.

September 2026

Mean temperature: 78.4°F; Warmest on record; Warmest of 152, provisional
Precipitation: 1.38 in; Driest since 2025; 32nd driest of 147

A normal September in St Louis, MO (1991 to 2020): a mean temperature of 70.2°F, between 67.7°F and 75°F in eight years of ten and 2.78 in of precipitation, between 0.88 in and 4.99 in in eight years of ten.

The mean temperature of every September in St Louis, MO since 1874: 78.4°F in 2026, the highest of them all.

Normal range, 67.7 to 75°F

Every year, ranked, as a table

Every September in St Louis, MO from 1874 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	78.4	1	87.5	4	69.3	1	1.38	116	0
2025	73.6	29	84.9	15	62.3	46	0.74	135	0
2024	73.5	32	83.7	29	63.4	36	5.75	17	0
2023	74.2	18	84.8	17	63.6	34	2.67	79	0
2022	71.4	56	81.4	62	61.5	56	1.73	101	0
2021	74.9	13	85.2	12	64.6	18	3.04	62	0
2020	70.9	64	80.8	70	61	70	0.90	130	0
2019	77.9	2	87.1	5	68.6	3	1.68	108	0
2018	74.8	15	84.5	19	65.1	15	2.00	95	0
2017	73.2	39	84.2	24	62.2	48	0.27	141	0
2016	75.4	8	85	14	65.8	8	4.95	25	0
2015	75.1	11	84.9	15	65.3	13	3.11	57	0
2014	70	80	80.3	77	59.8	93	4.20	33	0
2013	73.9	26	84.3	21	63.5	35	2.74	75	0
2012	69.4	95	78.9	97	59.9	92	3.03	63	0
2011	67.7	126	77.4	119	58	122	3.18	52	0
2010	71.3	57	81.2	65	61.4	61	3.73	38	0
2009	69.8	87	78.7	99	60.8	75	3.16	53	0
2008	70.2	76	79.2	92	61.3	65	9.77	2	0
2007	74	24	84.3	21	63.7	32	1.71	103	0
2006	67.5	129	77	126	58	122	1.28	119	0
2005	73.8	27	83.9	27	63.8	27	5.30	21	0
2004	71.5	55	82.3	55	60.6	80	0.23	143	0
2003	67.7	126	77.5	118	57.9	126	4.15	34	0
2002	73.3	36	83.5	31	63.2	39	2.44	87	0
2001	68.7	108	79.3	91	58.2	118	2.81	74	0
2000	69.6	90	80.3	77	58.9	107	2.62	81	0
1999	69.7	89	81.9	58	57.5	128	1.09	128	0
1998	75	12	84.2	24	65.7	9	1.86	99	0
1997	70.2	76	80	81	60.3	83	2.73	76	0
1996	67.2	133	77	126	57.4	130	2.86	71	0
1995	68	121	77.1	125	58.9	107	0.74	135	0
1994	70.2	76	79.6	89	60.7	76	1.18	124	0
1993	66.4	139	74.1	148	58.6	109	9.16	4	0
1992	69.2	98	78.7	99	59.7	95	2.98	66	0
1991	72.4	44	81.8	60	62.9	41	2.98	66	0
1990	74.1	20	83.5	31	64.6	18	0.78	133	0
1989	67.3	131	76.5	132	58.2	118	1.69	107	0
1988	72.5	41	83.3	35	61.7	52	1.99	96	0
1987	70.5	72	81.3	63	59.6	96	1.62	109	0
1986	73.3	36	82.8	41	63.8	27	7.99	7	0
1985	70.9	64	80.7	72	61	70	0.43	139	0
1984	68.2	118	77.7	116	58.6	109	8.88	6	0
1983	71.9	50	82.7	44	61.2	68	1.24	121	0
1982	68	121	76.7	129	59.3	102	5.27	22	0
1981	69.1	99	78.7	99	59.6	96	1.17	125	0
1980	72.4	44	83.2	36	61.7	52	3.12	56	0
1979	70.8	68	82.4	54	59.2	105	trace	146	0
1978	73.1	40	85.2	12	61	70	3.10	59	0
1977	70.7	71	80.4	74	61	70	3.64	40	0
1976	68.2	118	80.9	68	55.4	148	0.90	130	0
1975	64.7	149	74.8	144	54.6	151	2.48	85	0
1974	62.3	152	72.6	152	52	153	2.50	83	0
1973	70	80	78.6	102	61.4	61	3.52	43	0
1972	71.1	61	80.8	70	61.4	61	6.21	13	0
1971	72.5	41	83.2	36	61.8	50	3.98	36	0
1970	71.8	52	82.3	55	61.3	65	5.54	20	0
1969	69.3	96	80.1	79	58.4	115	5.03	24	0
1968	68	121	78.9	97	57.1	134	3.74	37	0
1967	66.5	138	77.2	124	55.7	144	4.33	31	0
1966	65.6	143	75.7	141	55.5	146	2.15	93	0
1965	69.1	99	78.3	110	59.8	93	3.00	65	0
1964	69.3	96	80.1	79	58.4	115	1.47	112	0
1963	68.5	112	80.9	68	56.1	140	1.13	126	0
1962	66.4	139	76.1	137	56.7	137	2.63	80	0
1961	71	62	82.7	44	59.4	100	4.01	35	0
1960	74.1	20	84.4	20	63.9	26	0.76	134	0
1959	71.3	57	81	66	61.5	56	2.85	72	0
1958	69.1	99	78.2	112	60	89	2.16	92	0
1957	68.4	114	78.6	102	58.2	118	0.88	132	0
1956	70.8	68	83.5	31	58.1	121	1.21	123	0
1955	73.6	29	85.8	10	61.3	65	3.19	51	0
1954	74.6	16	86.6	8	62.5	44	3.29	49	0
1953	72.4	44	86.1	9	58.6	109	0.40	140	0
1952	70	80	83.5	31	56.5	138	0.56	138	0
1951	66.3	142	76	138	56.5	138	3.15	54	0
1950	67.3	131	76	138	58.5	112	2.62	81	0
1949	63.9	150	74.5	147	53.3	152	3.32	48	0
1948	71.2	59	81.6	61	60.7	76	1.71	103	0
1947	71.2	59	82.8	41	59.6	96	3.03	63	0
1946	68.7	108	80	81	57.3	131	2.22	90	0
1945	69	104	77.8	114	60.2	86	10.04	1	0
1944	69.5	93	79.4	90	59.5	99	2.96	69	0
1943	65.6	143	76.2	136	55	149	3.46	46	0
1942	68.3	115	79.1	93	57.5	128	1.46	113	0
1941	71.6	54	82.9	40	60.3	83	4.45	29	0
1940	68.7	108	82.5	50	54.8	150	trace	146	0
1939	75.4	8	87.8	3	62.9	41	1.11	127	0
1938	72.2	48	83.8	28	60.7	76	1.00	129	0
1937	69.1	99	81.3	63	56.9	136	2.21	91	0
1936	73.6	29	82.6	47	64.6	18			0
1935	69.6	90	80.7	72	58.5	112			0
1934	65.4	146	74.7	146	56.1	140			0
1933	75.7	7	86.9	6	64.5	22			0
1932	68	121	79.8	85	56.1	140			0
1931	75.8	6	86.7	7	64.9	16	6.63	12	0
1930	71.9	50	82.7	44	61	70			0
1929	68.7	108	77.4	119	60	89	1.71	103	0
1928	67.4	130	76.9	128	57.9	126	1.70	106	0
1927	75.3	10	84.1	26	66.5	5	2.93	70	0
1926	70.9	64	78.4	107	63.4	36	7.40	9	0
1925	77.2	4	85.5	11	68.9	2	4.59	27	0
1924	64.9	148	73.9	149	56	143	1.97	98	0
1923	69	104	76.6	130	61.5	56	3.51	44	0
1922	73.7	28	83.7	29	63.8	27	2.49	84	0
1921	74.4	17	82.6	47	66.3	6	5.60	18	0
1920	72.5	41	80.4	74	64.6	18	4.79	26	0
1919	73.5	32	83	39	64.1	25	6.13	14	1
1918	63.5	151	71.6	153	55.5	146	5.09	23	0
1917	69	104	78	113	60	89	3.50	45	0
1916	68.3	115	77.3	122	59.3	102	2.69	77	0
1915	72.4	44	81	66	63.7	32	1.41	115	0
1914	69.6	90	77.7	116	61.6	55	6.68	11	0
1913	69.9	85	78.3	110	61.5	56	4.50	28	0
1912	70.9	64	79	94	62.7	43	2.84	73	0
1911	74.2	18	82.8	41	65.7	9	7.09	10	0
1910	70.4	73	78.4	107	62.4	45	6.09	15	0
1909	68.3	115	77.3	122	59.3	102	4.22	32	0
1908	73.4	34	82.5	50	64.2	24	1.24	121	0
1907	68.5	112	76.5	132	60.4	82	1.57	111	0
1906	73.4	34	81.9	58	64.9	16	4.40	30	0
1905	70.8	68	78.4	107	63.2	39	5.56	19	0
1904	71	62	79.7	86	62.3	46	2.97	68	0
1903	69.5	93	79	94	60.1	87	3.06	61	0
1902	66.4	139	74.8	144	58	122	1.98	97	0
1901	71.7	53	82	57	61.5	56	0.64	137	0
1900	74.1	20	82.6	47	65.6	11	2.68	78	0
1899	70.1	79	79.9	83	60.3	83	1.27	120	0
1898	74.1	20	83.1	38	65.2	14	3.23	50	0
1897	77.4	3	88.9	1	65.9	7	0.09	144	0
1896	68.2	118	77.4	119	59	106	2.42	88	0
1895			84.6	18	64.4	23	2.01	94	4
1894	70.4	73	79.7	86	61.7	52	3.11	57	2
1893	73.3	36	82.5	50	63.4	36	3.69	39	2
1892	70.3	75	79.9	83	60.7	76	1.59	110	0
1891	74	24	84.3	21	63.8	27	1.43	114	0
1890	65.1	147	72.9	151	57.2	133	1.80	100	0
1889	67	135	75.5	142	58.4	115	3.54	42	0
1888	66.7	137	76.3	134	57	135	1.31	118	0
1887	70	80	79	94	61.1	69	2.47	86	0
1886	72.1	49	80.4	74	63.8	27	9.60	3	0
1885	69.1	99	76.3	134	61.9	49	8.98	5	0
1884	74.9	13	82.5	50	67.3	4	6.04	16	0
1883	68	121	78.6	102	57.3	131	0.01	145	0
1882	69.9	85	79.7	86	60.1	87	1.73	101	0
1881	76.7	5	88	2	65.4	12	3.14	55	0
1880	67.6	128	76.6	130	58.5	112	3.10	59	0
1879	65.6	143	75.4	143	55.7	144	1.34	117	0
1878	68.9	107	78.5	106	59.4	100	3.42	47	0
1877	69.8	87	77.8	114	61.8	50	3.56	41	0
1876	67.2	133	73.8	150	60.5	81	7.63	8	0
1875	67	135	75.9	140	58	122	0.24	142	0
1874	70	80	78.6	102	61.4	61	2.30	89	1

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2026	78.4
2019	77.9
1897	77.4
1925	77.2
1881	76.7
1931	75.8
1933	75.7
2016	75.4
1939	75.4
1927	75.3

Coldest
Year	Mean, °F
1974	62.3
1918	63.5
1949	63.9
1975	64.7
1924	64.9
1890	65.1
1934	65.4
1966	65.6
1943	65.6
1879	65.6

Wettest
Year	Precipitation, in
1945	10.04
2008	9.77
1886	9.60
1993	9.16
1885	8.98
1984	8.88
1986	7.99
1876	7.63
1926	7.40
1911	7.09

Driest
Year	Precipitation, in
1979	trace
1940	trace
1883	0.01
1897	0.09
2004	0.23
1875	0.24
2017	0.27
1953	0.40
1985	0.43
1952	0.56

The hottest, coldest and wettest days

Hottest day: 101°F; 5 September 2026
Coldest night: 55°F; 29 September 2026
Wettest day: 0.73 in; 20 September 2026

Every month, season and year

Months

Seasons

Years

St Louis, MO the day's answers

All-time records

Every answer in words

September 2026 brought 1.38 in of precipitation in St Louis, MO, the driest September since 2025, 32nd driest of 147.
The hottest day of September 2026 in St Louis, MO: 101°F on Saturday 5 September 2026.
The coldest night of September 2026 in St Louis, MO: a low of 55°F on Tuesday 29 September 2026.
The wettest day of September 2026 in St Louis, MO: 0.73 in on Sunday 20 September 2026.