Carbondale, IL: September

30 September 2026: September 2026 averaged 77°F in Carbondale, IL, the warmest September since 1925 (1948 excluded: 14 of 30 days missing; 1984 excluded: 30 of 30 days missing), 3rd warmest of 118.

September 2026

Mean temperature: 77°F; Warmest since 1925; 3rd warmest of 118

A normal September in Carbondale, IL (1991 to 2020): a mean temperature of 68.3°F, between 64.8°F and 71.9°F in eight years of ten and 3.00 in of precipitation, between 0.89 in and 5.77 in in eight years of ten.

The mean temperature of every September in Carbondale, IL since 1899: 77°F in 2026; the highest is 78.1°F, in 1925.

Normal range, 64.8 to 71.9°F

Every year, ranked, as a table

Every September in Carbondale, IL from 1899 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	77	3	88.8	5	65.2	3			0
2025	71.8	30	85.8	22	57.8	44	2.33	76	0
2024	70.9	39	82.8	56	59.1	29			2
2023	70.5	47	83.3	49	57.7	46	0.64	111	1
2022	68.2	80	82.5	60	53.8	90	0.69	109	0
2021	70.6	43	83.2	51	57.9	42	6.48	10	0
2020	68.5	78	79.7	92	57.3	52	2.99	63	0
2019	75.5	8	88.9	4	62	11	0.41	116	0
2018	71.9	28	82	67	61.8	13	5.74	16	0
2017	69.4	64	82.3	63	56.4	66	1.77	88	0
2016	71.1	36	82.3	63	60	22	3.94	38	0
2015	70.2	50	82.2	65	58.1	37	3.03	60	0
2014	66.6	94	79.5	94	53.7	91	2.04	82	0
2013	70.2	50	82.7	57	57.8	44	0.90	101	0
2012	67.5	88	79.1	96	55.9	71	3.95	37	0
2011	66.3	98	77	112	55.7	73	6.08	13	0
2010	69.5	61	82.7	57	56.2	68	1.57	93	0
2009	69.2	67	79.9	89	58.6	32	3.19	55	0
2008	68.9	74	80.4	84	57.3	52	3.41	51	0
2007	71.7	31	84.8	34	58.6	32	2.23	78	0
2006	64.4	113	76.3	115	52.6	100	3.51	48	0
2005	72.1	27	84.6	36	59.6	24	3.47	50	0
2004	69.3	66	83.8	45	54.8	81	0.65	110	0
2003	64.7	112	76.9	114	52.4	104	2.86	66	0
2002	71.2	33	85.1	31	57.4	51	2.35	75	1
2001	65.7	104	78.6	99	52.9	96	2.32	77	0
2000	66.8	91	79.9	89	53.7	91	3.00	62	0
1999	67.3	89	84.7	35	49.9	115	0.84	104	0
1998	73.3	13	86.2	21	60.3	20	1.58	91	0
1997	67.8	83	79.7	92	55.9	71	4.39	29	0
1996	66.2	100	78.2	101	54.1	86	5.62	19	1
1995	65.1	109	78	104	51.9	106	1.54	95	2
1994	64.3	114	77.2	110	51.2	110	2.53	71	2
1993	64.8	111	75.3	117	54.3	83	9.52	1	0
1992	66.3	98	77.5	108	55.1	78	6.28	12	0
1991	68	81	82.4	61	53.9	88	3.20	54	1
1990	69.9	54	83	53	56.9	60	2.06	81	0
1989	65.4	107	78.1	102	52.5	102	2.09	80	1
1988	67.7	86	81	80	54.4	82	7.57	4	1
1987	68	81	84	42	52.5	102	1.76	89	2
1986	70.6	43	83.4	48	57.9	42	5.51	23	1
1985	66	102	80.8	81	51.3	109	0.53	112	2
1983	68.5	78	84.2	40	53.1	95	0.90	101	1
1982	65.5	105	78	104	52.6	100	3.05	58	2
1981	65.8	103	79.8	91	51.8	107	0.70	108	0
1980	70.8	40	84.6	36	57.1	56	3.93	39	0
1979	65.5	105	80	88	51	111	1.58	91	0
1978	70.5	47	84.2	40	56.7	64	0.16	117	0
1977	70.8	40	82.1	66	59.6	24	4.03	36	0
1976	65.1	109	80.7	83	49.4	119	1.32	96	0
1975	63.5	116	75.4	116	51.5	108	2.88	65	0
1974	62.6	118	73.2	118	52	105	5.02	27	0
1973	71.2	33	81.6	72	60.8	16	1.92	84	0
1972	72.5	20	81.7	69	63	9	3.64	44	1
1971	72.5	20	82.9	54	62.1	10	1.89	85	0
1970	74.6	10	85.4	27	63.7	8	3.79	42	0
1969	69.1	71	81.2	79	57	58	5.42	25	0
1968	69.2	67	81.9	68	56.5	65	3.36	52	0
1967	66.5	95	78.8	97	54.2	85	3.50	49	0
1966	66.7	93	77.8	106	55.6	75	4.08	35	0
1965	70.6	43	81.7	69	59.6	24	7.56	5	0
1964	70.3	49	83.7	46	56.9	60	3.31	53	0
1963	69.5	61	85.2	29	53.7	91	0.47	113	0
1962	67.2	90	78.3	100	56.1	69	2.84	67	0
1961	72.2	25	85	32	59.3	28	0.82	105	0
1960	73.2	14	87.9	12	58.6	32	0.88	103	0
1959	70.6	43	83.6	47	57.5	48	5.89	15	0
1958	68.9	74	80.4	84	57.3	52	2.14	79	0
1957	69.6	59	81.6	72	57.5	48	2.51	72	0
1956	68.6	77	83.9	44	53.2	94	2.49	73	0
1955	72.4	23	88.7	7	56.1	69	0.91	100	0
1954	71.4	32	87.9	12	55.3	77	4.65	28	2
1953	71.1	36	89.6	3	52.7	97	0.44	115	0
1952	67.8	83	84.5	39	51	111	2.91	64	0
1951	66.8	91	79.5	94	54	87	5.72	17	0
1950	67.7	86	77.2	110	58.1	37	4.32	30	0
1949	63.9	115	77.3	109	50.5	114	4.19	32	0
1948									14
1947	69.7	57	82.9	54	57	58	3.60	45	1
1946	69.9	54	81.6	72	58.1	37	3.02	61	0
1945	71.2	33	81.6	72	60.6	17	9.28	2	2
1944	70.2	50	80.8	81	59.7	23	1.97	83	0
1943	66.5	95	77.6	107	55.5	76	5.61	21	0
1942	69.1	71	80.2	86	58	41	1.25	97	0
1941	73.2	14	85.6	23	60.9	15	2.72	69	0
1940	69.1	71	88.2	11	49.9	115	0.45	114	0
1939	76.7	4	93.8	1	59.6	24	0.77	106	0
1938	72.2	25	86.3	17	58.1	37	1.57	93	0
1937	69.2	67	82.7	57	55.7	73	4.11	33	0
1936	75.4	9	86.3	17	64.5	4	6.77	8	0
1935	70.2	50	85.5	25	54.9	80	3.19	55	0
1934	67.8	83	78.7	98	56.9	60	6.57	9	0
1933	75.7	6	87	15	64.4	6	2.67	70	0
1932	69.4	64	81.7	69	57.2	55	5.47	24	0
1931	76.3	5	88.8	5	63.8	7	3.88	40	0
1930	73	17	85	32	61.1	14	7.26	6	0
1929	69.8	56	82.4	61	57.1	56	5.90	14	0
1928	66.2	100	81.5	78	50.9	113	0.09	118	0
1927	74.6	10	88.6	9	60.6	17	6.80	7	0
1926	73.7	12	85.5	25	61.9	12	3.59	46	0
1925	78.1	1	90.7	2	65.4	2	6.29	11	0
1924	66.5	95	80.2	86	52.7	97	3.88	40	0
1923	69.6	59	81.6	72	57.6	47	4.21	31	0
1922	72.5	20	88.5	10	56.4	66	1.73	90	0
1921	75.6	7	86.8	16	64.5	4	8.51	3	0
1920	72.4	23	86.3	17	58.5	35	1.81	87	0
1919	73.2	14	87.7	14	58.8	31	3.72	43	0
1918	63.3	117	77	112	49.6	118	5.04	26	0
1917	69.5	61	84	42	55	79	0.92	99	0
1916	69.2	67	81.6	72	56.8	63	3.07	57	0
1915	72.9	18	85.4	27	60.4	19	3.58	47	0
1914	71.1	36	83.3	49	59	30	3.04	59	0
1913	70.8	40	83.2	51	58.4	36	2.74	68	0
1912	71.9	28	86.3	17	57.5	48	5.62	19	0
1911	77.6	2	88.7	7	66.4	1	5.70	18	0
1910	72.9	18	85.6	23	60.1	21	5.60	22	0
1904					49.9	115	4.10	34	7
1903							2.46	74	18
1902	65.4	107	78.1	102	52.7	97	1.88	86	0
1901	69.7	57	85.2	29	54.3	83	0.74	107	1
1900									14
1899	68.9	74	84.6	36	53.9	88	1.07	98	1

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1925	78.1
1911	77.6
2026	77
1939	76.7
1931	76.3
1933	75.7
1921	75.6
2019	75.5
1936	75.4
1970	74.6
More years share the last value

Coldest
Year	Mean, °F
1974	62.6
1918	63.3
1975	63.5
1949	63.9
1994	64.3
2006	64.4
2003	64.7
1993	64.8
1995	65.1
1976	65.1

Wettest
Year	Precipitation, in
1993	9.52
1945	9.28
1921	8.51
1988	7.57
1965	7.56
1930	7.26
1927	6.80
1936	6.77
1934	6.57
2021	6.48

Driest
Year	Precipitation, in
1928	0.09
1978	0.16
2019	0.41
1953	0.44
1940	0.45
1963	0.47
1985	0.53
2023	0.64
2004	0.65
2022	0.69

The hottest, coldest and wettest days

Hottest day: 103°F; 5 September 2026
Coldest night: 46°F; 28 September 2026
Wettest day: 0.96 in; 10 September 2026

Every month, season and year

Months

Seasons

Years

Carbondale, IL the day's answers

All-time records

Every answer in words

The hottest day of September 2026 in Carbondale, IL: 103°F on Saturday 5 September 2026.
The coldest night of September 2026 in Carbondale, IL: a low of 46°F on Monday 28 September 2026.
The wettest day of September 2026 in Carbondale, IL: 0.96 in on Thursday 10 September 2026.