Stillwater, OK: September

30 September 2026: September 2026 averaged 82.3°F in Stillwater, OK, the warmest September since 1931 (1946 excluded: 30 of 30 days missing; 1947 excluded: 30 of 30 days missing; 1957 excluded: 30 of 30 days missing; 2 more years excluded for missing days), 2nd warmest of 125.

September 2026

Mean temperature: 82.3°F; Warmest since 1931; 2nd warmest of 125
Precipitation: 1.01 in; Driest since 2025; 23rd driest of 129

A normal September in Stillwater, OK (1991 to 2020): a mean temperature of 74.1°F, between 69.8°F and 76.2°F in eight years of ten and 2.90 in of precipitation, between 1.30 in and 5.06 in in eight years of ten.

The mean temperature of every September in Stillwater, OK since 1894: 82.3°F in 2026; the highest is 82.4°F, in 1931.

Normal range, 69.8 to 76.2°F

Every year, ranked, as a table

Every September in Stillwater, OK from 1893 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	82.3	2	93.8	5	70.7	2	1.01	106	0
2025	74.4	46	87	48	61.8	53	0.06	128	0
2024	76.7	19	91.3	11	62	48	0.44	120	0
2023	78.1	10	91.4	10	64.8	16	1.01	106	0
2022	77.7	13	92.6	7	62.7	39	0.14	127	0
2021	79.1	7	93.9	3	64.4	19	0.18	125	0
2020	71.4	88	83.6	91	59.2	88	2.58	66	0
2019	81.2	3	91.7	9	70.7	2	7.41	11	0
2018	74.3	47	83.7	89	64.8	16	2.98	56	0
2017	74.1	55	87	48	61.1	63	3.50	48	0
2016	75.5	27	87.8	40	63.3	30	1.99	86	0
2015	76.2	22	87.9	38	64.4	19	4.03	41	0
2014	74.3	47	86.6	52	61.9	50	4.03	41	0
2013	76.2	22	91.2	13	61.1	63	1.71	90	0
2012	75.5	27	88.8	28	62.1	45	1.19	101	0
2011	70.6	101	85.3	71	55.9	117	3.11	50	0
2010	75.4	29	88	37	62.7	39	2.79	59	0
2009	71.3	91	81.5	110	61	66	2.51	69	0
2008	71.5	86	84	86	58.9	91	2.44	73	0
2007	75.1	32	85.9	61	64.2	21	4.57	36	1
2006	70.4	105	85.2	73	55.5	121	1.31	99	0
2005	76.1	24	88.7	29	63.6	28	3.07	52	0
2004	74.3	47	88.1	34	60.4	72	0.69	115	0
2003	68.5	118	79.7	126	57.3	110	1.67	92	0
2002	73.8	59	86.5	53	61	66	4.01	43	0
2001	70.9	98	83.4	95	58.4	96	2.67	63	0
2000	75.4	29	91.2	13	59.6	82	0.16	126	0
1999	69.9	113	81.2	114	58.6	93	4.47	38	0
1998	80.1	5	92.5	8	67.7	5	2.79	59	0
1997	74.3	47	86	58	62.5	41	4.37	40	0
1996	69.6	115	80.9	117	58.3	99	4.99	30	0
1995	71.4	88	79.8	124	61.1	63	5.90	25	2
1994	70.4	105	82.7	101	57.5	107	2.81	57	1
1993	68.1	119	81.1	115	55.1	123	4.67	33	1
1992	70.5	103	82.7	101	58.4	96	2.72	61	3
1991			80.5	121			5.70	27	5
1990	76.9	18	90.7	15	63.3	30	3.83	45	1
1989	67.9	122	79.9	123	55.8	119	4.86	31	0
1988	72.2	80	85.6	65	58.8	92	7.78	10	0
1987	71.2	95	84.1	80	58.3	99	4.41	39	0
1986	74.3	47	83.1	98	65.5	10	8.40	9	0
1985			84.9	77			5.99	24	4
1984	71.8	85	83.5	92	60	76	1.19	101	0
1983	73.7	61	87.1	46	60.3	74	2.05	84	0
1982	73	73	85.6	65	60.8	69	2.30	77	1
1981	73.9	58	86.1	56	61.6	54	2.58	66	0
1980	76.6	20	87.9	38	65.2	11	1.40	97	0
1979	71.5	86	85.3	71	57.6	106	1.31	99	0
1978	77.6	15	89.2	24	66	8	0.95	109	0
1977	75.6	26	86.1	56	65.1	13	2.06	83	0
1976	70.2	111	82.3	107	58.1	102	1.84	88	0
1975	69.2	117	80.8	119	56.8	112	2.09	82	2
1974	64.6	125	74.2	129	55	124	6.03	23	0
1973	70.6	101	79.3	128	62	48	12.41	3	1
1972	74.6	41	84.1	80	64.8	16	2.51	69	1
1971	71.4	88	83.1	98	59.7	81	7.21	13	0
1970	73.7	61	85.7	64	61.6	54	6.57	16	0
1969	73.3	70	85.2	73	61.5	57	3.77	46	0
1968	71.3	91	85.8	62	56.7	113	1.88	87	0
1967	70.2	111	81	116	59.4	83	4.60	35	0
1966	70.3	109	82.5	106	58	103	1.34	98	0
1965	73.6	65	86.5	53	60.7	70	6.50	18	0
1964	72.9	76	83.7	89	62.1	45	2.43	74	0
1963	74.9	34	87.5	41	62.3	44	3.03	54	0
1962	72.1	81	82.7	101	61.5	57	7.23	12	0
1961	70.7	99	81.5	110	59.8	80	9.43	5	0
1960	74.7	40	88.2	32	61.2	62	0.74	113	0
1959	73	73	85.5	67	60.4	72	11.10	4	0
1958	74.6	41	85.5	67	63.7	26	3.57	47	0
1956	79.2	6	95.6	2	62.8	38	0.20	124	0
1955	77.6	15	90.1	18	65.2	11	1.16	104	0
1954	78.8	9	93.8	5	63.7	26	0.96	108	0
1953	74.8	38	89.6	22	60	76	2.20	80	0
1952	73.6	65	89.8	20	57.4	109	0.68	116	0
1951	71.3	91	83.5	92	59.1	89	6.18	20	0
1950	70.4	105	81.3	113	59.4	83	1.54	94	0
1949	68	121	80.5	121	55.5	121	4.50	37	0
1948	74.3	47	88.6	30	60	76	0.61	118	0
1945	72.9	76	85.5	67	60.2	75	14.04	1	0
1944	73.1	72	87	48	59.1	89	3.12	49	0
1943	72.1	81	87.2	43	57	111	3.10	51	0
1942	71	97	84.1	80	57.8	104	4.83	32	0
1941	74.6	41	85.2	73	64	24	5.18	29	0
1940	71.3	91	84.1	80	58.4	96	1.17	103	0
1939	80.4	4	97.6	1	63.1	33	0.39	122	0
1938	74.8	38	89.7	21	59.9	79	2.16	81	0
1937	75	33	86	58	64.1	22	2.24	79	0
1936	77.9	11	87.2	43	68.7	4	5.77	26	0
1935	69.7	114	80.7	120	58.3	99	2.26	78	1
1934	68.1	119	79.8	124	55.9	117			1
1933	77.8	12	89	26	66.5	7			1
1932	73.6	65	84.8	78	62.4	42	0.94	110	0
1931	82.4	1	93.9	3	70.8	1	2.01	85	1
1930	77.7	13	89.5	23	65.8	9	0.91	111	0
1929	71.9	83	83.4	95	60.7	70	2.66	64	2
1928			86	58			0.37	123	5
1927	73	73	84.1	80	61.9	50	6.57	16	0
1926	71.9	83	82.7	101	61	66	7.07	14	0
1925	75.2	31	87.1	46	63.3	30	2.45	72	0
1924	71.2	95	85.8	62	56.2	116	2.65	65	2
1923	74	57	83.8	88	64.1	22	13.98	2	0
1922	74.9	34	88.4	31	61.3	60	1.69	91	0
1921	76.1	24	88.2	32	64	24	6.43	19	0
1920	74.3	47	85.5	67	63.1	33	2.43	74	0
1919	74.6	41	86.2	55	63	36	2.48	71	0
1918	66.7	123	80.9	117	52.9	125	5.36	28	2
1917	70.3	109	81.8	109	58.6	93	0.50	119	2
1916	70.7	99	83.5	92	57.8	104	1.81	89	0
1915	72.3	78	82.6	105	61.9	50	8.56	8	0
1914					63.4	29	3.84	44	9
1913	70.5	103	81.5	110	59.3	85	6.13	21	2
1912	70.4	105	84	86	56.3	114	2.80	58	3
1911	79	8	90.3	16	67.6	6	3.07	52	0
1910	76.5	21	90.1	18	62.9	37	0.67	117	0
1909	73.3	70	89.1	25	57.5	107	1.54	94	0
1908			82.2	108			6.11	22	22
1907	73.7	61	88.1	34	59.3	85	0.44	120	0
1906	73.6	65	84.1	80	63.1	33	9.00	7	0
1905	74.9	34	87.4	42	62.4	42	2.38	76	0
1904	73.4	69	85.1	76	61.6	54	1.66	93	0
1903	69.5	116	83.1	98	55.8	119	3.01	55	0
1902	66.1	124	79.6	127	52.6	126	4.64	34	3
1901	74.3	47	87.2	43	61.4	59	1.11	105	0
1900	74.9	34	84.8	78	65	14	9.22	6	0
1899	73.8	59	91.3	11	56.3	114	0.88	112	0
1898	74.6	41	86.9	51	62.1	45	2.72	61	1
1897	74.1	55	88.9	27	59.3	85	0.71	114	1
1896	73.7	61	88.1	34	58.6	93	2.54	68	3
1895	77.6	15	90.2	17	65	14	1.50	96	0
1894	72.3	78	83.4	95	61.3	60	6.89	15	0
1893							0.00	129	30

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1931	82.4
2026	82.3
2019	81.2
1939	80.4
1998	80.1
1956	79.2
2021	79.1
1911	79
1954	78.8
2023	78.1

Coldest
Year	Mean, °F
1974	64.6
1902	66.1
1918	66.7
1989	67.9
1949	68
1993	68.1
1934	68.1
2003	68.5
1975	69.2
1903	69.5

Wettest
Year	Precipitation, in
1945	14.04
1923	13.98
1973	12.41
1959	11.10
1961	9.43
1900	9.22
1906	9.00
1915	8.56
1986	8.40
1988	7.78

Driest
Year	Precipitation, in
1893	0.00
2025	0.06
2022	0.14
2000	0.16
2021	0.18
1956	0.20
1928	0.37
1939	0.39
2024	0.44
1907	0.44

The hottest, coldest and wettest days

Hottest day: 101°F; 9 September 2026, 8 September 2026, 7 September 2026, 6 September 2026
Coldest night: 58°F; 23 September 2026
Wettest day: 0.50 in; 10 September 2026

Every month, season and year

Months

Seasons

Years

Stillwater, OK the day's answers

All-time records

Every answer in words

September 2026 brought 1.01 in of precipitation in Stillwater, OK, the driest September since 2025, tied 23rd driest of 129 (with 2023).
The hottest day of September 2026 in Stillwater, OK: 101°F on Wednesday 9 September 2026, Tuesday 8 September 2026, Monday 7 September 2026 and 1 other day.
The coldest night of September 2026 in Stillwater, OK: a low of 58°F on Wednesday 23 September 2026.
The wettest day of September 2026 in Stillwater, OK: 0.50 in on Thursday 10 September 2026.