Key West, FL: September

30 September 2026: September 2026 averaged 84.1°F in Key West, FL, the warmest September since 2024, tied 22nd warmest of 152 (with 1995, 1957 and 1880).

September 2026

Mean temperature: 84.1°F; Warmest since 2024; 22nd warmest of 152
Precipitation: 8.11 in; Wettest since 2025; 40th wettest of 156

A normal September in Key West, FL (1991 to 2020): a mean temperature of 83.8°F, between 82.3°F and 85°F in eight years of ten and 6.53 in of precipitation, between 4.39 in and 9.38 in in eight years of ten.

The mean temperature of every September in Key West, FL since 1872: 84.1°F in 2026; the highest is 86.2°F, in 2024.

Normal range, 82.3 to 85°F

Every year, ranked, as a table

Every September in Key West, FL 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	Days missing
2026	84.1	22	88.7	34	79.4	19	8.11	40	0
2025	83.8	29	88.6	41	79	30	9.39	24	0
2024	86.2	1	90.4	5	81.9	1	3.34	133	0
2023	85.4	4	90.4	5	80.5	6	8.77	31	0
2022	83.4	48	88.5	48	78.3	54	12.06	10	0
2021	83.7	35	88.2	64	79.2	23	2.53	150	0
2020	85.6	3	89.8	13	81.4	3	12.21	9	0
2019	84.5	16	88.9	26	80	11	4.10	118	0
2018	85.8	2	90.1	9	81.5	2	6.08	81	0
2017	84.6	15	88.9	26	80.3	7	9.28	26	0
2016	83.9	27	88.6	41	79.1	26	8.04	42	0
2015	84.9	10	89.1	22	80.7	4	6.31	74	0
2014	83.7	35	88	72	79.4	19	5.42	92	0
2013	82.8	81	87.1	121	78.5	46	4.80	109	0
2012	82.2	118	86.6	137	77.8	80	5.53	88	0
2011	84.9	10	89.2	21	80.7	4	7.30	51	0
2010	83.5	41	88	72	79.1	26	8.92	30	0
2009	84.7	14	89.8	13	79.5	17	5.31	97	0
2008	82.3	113	86.5	138	78.2	59	8.12	39	0
2007	85	8	90.2	8	79.7	12	9.31	25	0
2006	83.4	48	88.4	55	78.4	49	6.86	62	0
2005	83.3	52	88.4	55	78.2	59	7.35	50	0
2004	82.6	91	87.1	121	78	69	6.09	80	0
2003	85	8	89.6	16	80.3	7	5.69	85	0
2002	84	26	88.3	59	79.6	15	8.30	36	0
2001	81.8	134	86.8	132	76.8	125	10.01	19	0
2000	83.8	29	88.9	26	78.8	37	4.02	123	0
1999	83.3	52	88.7	34	78	69	7.72	47	0
1998			88	72			3.25	137	4
1997	81.9	132	87	127	76.8	125	6.50	67	0
1996	83.5	41	88.6	41	78.4	49	6.55	66	0
1995	84.1	22	90	12	78.3	54	4.42	113	0
1994	82.6	91	87.3	113	77.9	75	13.00	7	0
1993	83.9	27	88.9	26	78.8	37	5.75	83	0
1992	83.1	63	88.2	64	78	69	7.15	53	0
1991	83.8	29	89.3	20	78.2	59	5.39	93	0
1990	83.8	29	89.5	18	78.1	67	5.29	98	0
1989	85.1	6	90.4	5	79.7	12	3.15	139	0
1988	83.6	38	88.7	34	78.4	49	3.48	129	0
1987	84.9	10	90.7	3	79.1	26	6.88	61	0
1986	83.4	48	88.5	48	78.4	49	4.58	112	0
1985	82.1	122	86.9	130	77.4	95	6.42	69	0
1984	81.5	139	85	152	78	69	8.11	40	0
1983	82.7	84	86.8	132	78.5	46	2.25	151	0
1982	82.3	113	87.3	113	77.2	104	6.36	71	0
1981	83	69	87.4	105	78.6	43	6.68	65	0
1980	84.4	17	88.6	41	80.2	9	6.01	82	0
1979	83.6	38	88.1	70	79.2	23	2.84	148	0
1978	84.2	21	89.1	22	79.2	23	3.03	144	0
1977	83.3	52	87.5	95	79.1	26	3.71	125	0
1976	83.5	41	88.3	59	78.7	40	3.38	131	0
1975	82.7	84	87.8	86	77.7	81	7.11	56	0
1974	84.3	19	88.5	48	80.2	9	3.05	143	0
1973	83	69	87.4	105	78.6	43	3.30	134	0
1972	82.9	75	87.9	79	77.9	75	8.70	32	0
1971	82.7	84	87	127	78.3	54	5.47	89	0
1970	81.6	137	86.3	144	76.9	117	5.35	95	0
1969	83	69	87	127	79	30	10.21	18	0
1968	83.1	63	88	72	78.2	59	6.90	60	0
1967	83.8	29	88.3	59	79.4	19	4.96	107	0
1966	83.3	52	88	72	78.5	46	8.34	35	0
1965	83.2	59	87.5	95	78.9	34	10.59	16	0
1964	83.5	41	88.4	55	78.7	40	4.10	118	0
1963	83.8	29	88.9	26	78.7	40	18.45	1	0
1962	83.1	63	88.7	34	77.5	90	5.12	102	0
1961	83	69	87.9	79	78.1	67	1.71	156	0
1960	82.7	84	87.7	90	77.6	85	9.12	27	0
1959	82.5	94	87.9	79	77.1	109	8.50	33	0
1958	83.2	59	88.5	48	77.9	75	7.55	48	0
1957	84.1	22	90.9	2	77.3	98	3.00	145	0
1956	82	125	88.7	34	75.3	151	11.19	13	0
1955	83.3	52	90.1	9	76.5	139	4.05	121	0
1954	82.9	75	89.6	16	76.2	147	5.75	83	0
1953	83.5	41	89.5	18	77.6	85	12.27	8	0
1952	83.2	59	88.8	32	77.6	85	4.06	120	0
1951	85.2	5	91.3	1	79	30	2.96	147	0
1950	82.4	106	88.6	41	76.3	144	9.66	23	0
1949	82.9	75	88.3	59	77.5	90	6.46	68	0
1948	82.7	84	88.2	64	77.2	104	13.84	6	0
1947	82.5	94	87.5	95	77.5	90	6.72	63	0
1946	83.3	52	88.5	48	78	69	3.44	130	0
1945	82.3	113	87.5	95	77.2	104	8.04	42	0
1944	84.3	19	89	25	79.5	17	4.60	111	0
1943	83.6	38	88.6	41	78.6	43	6.35	72	0
1942	83.5	41	88.5	48	78.4	49	2.79	149	0
1941	83.1	63	88.7	34	77.5	90	4.93	108	0
1940	81.5	139	86.9	130	76	149	11.88	12	0
1939	83.1	63	89.1	22	77.1	109	3.18	138	0
1938	82.8	81	88.2	64	77.3	98	3.72	124	0
1937	82.2	118	87.7	90	76.8	125	8.01	45	0
1936	82.9	75	88.6	41	77.3	98	5.19	100	0
1935	82.5	94	88	72	76.9	117	9.69	22	0
1934	82.5	94	88.2	64	76.7	129	6.72	63	0
1933	82.8	81	87.7	90	77.9	75	3.10	142	0
1932	83.7	35	88.3	59	79	30	3.29	135	0
1931	82	125	87.2	117	76.9	117	9.10	29	0
1930	83.4	48	88	72	78.8	37	2.19	153	0
1929	82.4	106	87.3	113	77.4	95	5.57	86	0
1928	82.3	113	87.7	90	76.9	117	8.13	38	0
1927	82.5	94	88.5	48	76.5	139	5.37	94	0
1926	82.9	75	87.9	79	78	69	2.17	154	0
1925	82.5	94	87.9	79	77.1	109	6.22	77	0
1924	83	69	88.4	55	77.6	85	5.10	103	0
1923	82.3	113	87.5	95	77.1	109	4.97	106	0
1922	82.2	118	87.4	105	77	115	5.56	87	0
1921	82.2	118	87.4	105	76.9	117	5.45	90	0
1920	82.1	122	87.4	105	76.9	117	11.89	11	0
1919	82.4	106	87.1	121	77.7	81	14.26	4	0
1918	82.6	91	87.9	79	77.3	98	3.53	128	0
1917	81.6	137	86.7	135	76.6	134	8.37	34	0
1916	81.7	135	87.1	121	76.3	144	4.38	115	0
1915	82.4	106	87.8	86	76.9	117	7.82	46	0
1914	81.9	132	87.2	117	76.6	134	4.62	110	0
1913	81.5	139	86.4	140	76.6	134	6.22	77	0
1912	83	69	87.8	86	78.3	54	4.35	116	0
1911	82.5	94	88.1	70	76.9	117	2.05	155	0
1910	81.5	139	86.4	140	76.5	139	6.42	69	0
1909	80.6	151	86.1	147	75.2	152	6.35	72	0
1908	82.4	106	88.2	64	76.5	139	7.14	55	0
1907	82.5	94	87.8	86	77.2	104	8.17	37	0
1906	82.5	94	87.4	105	77.7	81	5.09	104	0
1905	82.5	94	87.5	95	77.6	85	7.03	59	0
1904	82	125	87.1	121	76.8	125	3.55	127	0
1903	82.1	122	87.5	95	76.6	134	3.00	145	0
1902	82.9	75	87.5	95	78.3	54	3.37	132	0
1901	81.4	143	86.1	147	76.7	129	7.15	53	0
1900	81.4	143	85.8	149	77	115	10.00	20	0
1899	82.7	84	87.3	113	78.2	59	3.27	136	0
1898	82	125	86.8	132	77.2	104	5.33	96	0
1897	80.7	150	84.7	153	76.6	134	9.11	28	0
1896	82	125	86.4	140	77.7	81	4.22	117	0
1895	82	125	87.2	117	76.7	129	4.41	114	0
1894	81.4	143	86.3	144	76.4	143	17.29	2	0
1893	82.5	94	87.5	95	77.4	95	2.23	152	0
1892	82	125	87.2	117	76.7	129	4.05	121	0
1891	81	148	86.5	138	75.4	150	10.39	17	0
1890	80.3	152	86.3	144	74.4	153	16.14	3	0
1889	81.2	147	86.4	140	76.1	148	13.87	5	0
1888	81.3	146	85.6	151	77.1	109	5.45	90	0
1887	81	148	85.8	149	76.3	144	7.30	51	0
1886					77.1	109	7.10	57	30
1885	84.4	17	89.8	13	78.9	34	5.23	99	0
1884	82.5	94	87.7	90	77.3	98	7.08	58	0
1883	83.5	41	88.8	32	78.2	59	5.17	101	0
1882	82.4	106	87.4	105	77.5	90	6.16	79	0
1881	83.3	52	88.7	34	77.9	75	10.71	14	0
1880	84.1	22	88.9	26	79.4	19	3.59	126	1
1879	83.1	63	87.9	79	78.2	59	9.71	21	0
1878	83.2	59	87.4	105	78.9	34	8.04	42	1
1877	84.8	13	90.1	9	79.6	15	5.04	105	0
1876							3.13	141	7
1875	82.7	84	87.1	121	78.2	59	10.67	15	0
1874	81.7	135	86.7	135	76.7	129	7.42	49	0
1873	82.4	106	87.5	95	77.3	98	6.23	76	0
1872	85.1	6	90.5	4	79.7	12	3.15	139	0
1871							6.30	75	30

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2024	86.2
2018	85.8
2020	85.6
2023	85.4
1951	85.2
1989	85.1
1872	85.1
2007	85
2003	85
2015	84.9
More years share the last value

Coldest
Year	Mean, °F
1890	80.3
1909	80.6
1897	80.7
1891	81
1887	81
1889	81.2
1888	81.3
1901	81.4
1900	81.4
1894	81.4

Wettest
Year	Precipitation, in
1963	18.45
1894	17.29
1890	16.14
1919	14.26
1889	13.87
1948	13.84
1994	13.00
1953	12.27
2020	12.21
2022	12.06

Driest
Year	Precipitation, in
1961	1.71
1911	2.05
1926	2.17
1930	2.19
1893	2.23
1983	2.25
2021	2.53
1942	2.79
1979	2.84
1951	2.96

The hottest, coldest and wettest days

Hottest day: 94°F; 12 September 2026
Coldest night: 72°F; 29 September 2026
Wettest day: 0.97 in; 8 September 2026

Every month, season and year

Months

Seasons

Years

Key West, FL the day's answers

All-time records

Every answer in words

September 2026 brought 8.11 in of precipitation in Key West, FL, the wettest September since 2025, tied 40th wettest of 156 (with 1984).
The hottest day of September 2026 in Key West, FL: 94°F on Saturday 12 September 2026.
The coldest night of September 2026 in Key West, FL: a low of 72°F on Tuesday 29 September 2026.
The wettest day of September 2026 in Key West, FL: 0.97 in on Tuesday 8 September 2026.