Spencer, IA: September

30 September 2026: September 2026 averaged 66.4°F in Spencer, IA, the warmest September since 2024, 19th warmest of 112.

September 2026

Mean temperature: 66.4°F; Warmest since 2024; 19th warmest of 112
Precipitation: 6.53 in; Wettest since 2018; 10th wettest of 111

A normal September in Spencer, IA (1991 to 2020): a mean temperature of 62.7°F, between 59°F and 66.9°F in eight years of ten and 2.31 in of precipitation, between 0.86 in and 5.99 in in eight years of ten.

The mean temperature of every September in Spencer, IA since 1895: 66.4°F in 2026; the highest is 69.9°F, in 1931.

Normal range, 59 to 66.9°F

Every year, ranked, as a table

Every September in Spencer, IA from 1895 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	66.4	19	74.2	66	58.5	2	6.53	10	0
2025	65.2	27	79.8	16	50.5	45	0.43	106	0
2024	67	12	82.4	3	51.6	29	0.93	94	0
2023	67.7	9	81.5	6	53.9	14	0.26	110	0
2022	65.6	22	80.9	11	50.2	50	0.59	102	0
2021	65.4	24	80.2	15	50.7	41	4.18	25	1
2020	62.7	49	76.2	47	49.1	60	1.02	89	0
2019	68.6	4	78.9	23	58.2	3	4.64	21	0
2018	65.2	27	75.7	51	54.6	10	8.51	5	0
2017	65.6	22	78.6	26	52.5	24	3.29	44	0
2016	66	21	77.7	32	54.4	12	6.74	9	2
2015	67.3	11	78.9	23	55.6	5	2.58	61	0
2014	60.9	72	72.8	78	49	64	3.01	50	0
2013	66.8	14	81	10	52.6	23	0.37	109	0
2012	61.1	69	78.2	30	44	107	1.21	87	0
2011	58.8	97	72.7	79	45	100	0.68	101	0
2010	60.4	77	72.7	79	48.2	72	5.80	15	0
2009	63.5	39	77.2	35	49.8	52	1.55	80	0
2008	61.3	66	74.7	62	47.9	76	2.15	68	0
2007	62.9	46	76.8	40	49.1	60	3.42	41	0
2006	57.6	105	69.8	103	45.4	96	2.17	67	0
2005	68.1	5	81.5	6	54.6	10	3.64	35	2
2004	66.7	16	79.4	19	54	13	14.66	1	0
2003	60.1	82	75.2	55	45	100	1.57	79	0
2002	62.9	46	76.1	48	49.7	54	1.84	73	0
2001	59.8	85	72.4	84	47.2	82	1.78	75	0
2000	62.2	55	77.1	37	47.2	82	0.90	95	0
1999	59.1	90	74.5	64	43.8	109	0.39	107	0
1998	66.2	20	81.4	8	50.9	38	1.32	86	0
1997	63.1	42	75.9	50	50.5	45	2.78	55	1
1996	59.7	86	70.5	100	48.8	66	2.55	62	0
1995	59	93	70.8	96	47.4	79	3.04	47	1
1994	64	37	75.3	54	52.7	21	3.56	39	0
1993	56.6	108	66.8	111	46.4	90	2.31	65	0
1991	60.6	74	72	89	49.1	60	2.06	70	0
1990	65.2	27	76.8	40	53.6	16	1.36	85	0
1989	60.4	77	73.2	73	47.5	78	3.83	33	0
1988	62.7	49	75.1	58	50.3	49	3.62	36	0
1987	61.9	61	73.8	68	50	51	2.80	54	0
1986	62.2	55	72.5	82	51.8	28	2.93	51	0
1985	58.9	95	67.3	110	50.6	43	7.06	8	0
1984	58.1	103	70.9	95	45.2	98	0.45	104	0
1983	62.2	55	74.3	65	50.7	41	3.95	31	2
1982	60.9	72	70.5	100	51.3	32	5.70	16	0
1981	69	2	79.2	21	58.7	1	5.42	18	0
1979	64.1	36	76.9	39	51.2	33	2.90	52	0
1978	67.6	10	79.7	17	55.4	7	1.52	81	0
1977	62.5	51	74.6	63	50.4	48	4.20	23	0
1976	61.5	64	76.1	48	46.9	86	2.61	60	0
1975	56.5	110	68.6	107	44.5	105	0.79	96	0
1974	57.4	106	72.3	86	42.4	112	1.51	82	0
1973	59.3	89	69.3	106	49.3	58	6.21	12	0
1972	58.9	95	71.5	92	46.4	90	3.04	47	0
1971	61.5	64	74.9	60	48.1	74	1.50	83	0
1970	61.3	66	73.3	72	49.4	57	3.87	32	0
1969	61.2	68	73.2	73	49.1	60	1.41	84	0
1967	58.5	101	72.9	76	44	107	0.44	105	0
1966	59.6	87	72.9	76	46.2	92	0.78	97	0
1965	54.1	112	63.3	112	44.9	102	7.96	6	0
1964	60.6	74	71.9	90	49.3	58	8.77	4	0
1963	63.3	41	75.1	58	51.5	31	2.15	68	0
1962	58.2	102	71.6	91	44.8	103	1.71	76	0
1961	59	93	69.8	103	48.3	70	4.04	29	0
1960	62.3	53	73.4	70	51.1	35	4.02	30	0
1959	60.3	79	72.3	86	48.2	72	3.47	40	0
1958	63.1	42	77.6	33	48.7	67	0.78	97	0
1957	59.1	90	70.8	96	47.4	79	2.72	58	0
1956	59.5	88	75.2	55	43.8	109	0.38	108	0
1955	63.5	39	78.3	27	48	75	1.80	74	2
1954	62	59	73.1	75	50.8	40	2.62	59	0
1953	60.3	79	76.4	44	44.2	106	0.98	90	0
1952	62.3	53	77.2	35	47.3	81	0.95	92	0
1951	56.6	108	67.8	109	45.3	97	3.59	37	0
1950	60.5	76	73.7	69	47.2	82	3.18	46	0
1949	56.7	107	70.8	96	42.6	111	4.89	19	0
1948	64.6	34	79.7	17	49.5	56	0.76	99	0
1947	63.1	42	76.6	42	49.7	54			0
1946	58.7	99	70.7	99	46.9	86			2
1945	59.9	83	71.4	94	46.7	88	1.59	78	2
1944	62.4	52	74.1	67	50.6	43	2.02	71	0
1943	59.1	90	72.5	82	45.7	94	1.18	88	0
1942	58.7	99	69.8	103	47.7	77	3.33	43	1
1941	64.9	32	76.4	44	53.3	18	6.43	11	0
1940	66.5	17	80.6	12	52.7	21	0.09	111	1
1939	66.8	14	83.3	2	50.9	38	0.49	103	1
1938	66.5	17	79.1	22	53.9	14	12.00	2	0
1937	64.7	33	78.3	27	51.1	35	2.20	66	1
1936	67.9	8	80.6	12	55.1	8	2.90	52	0
1935	64.6	34	79.4	19	49.8	52	1.94	72	2
1934	58.8	97	72.4	84	45.1	99	3.04	47	0
1933	68	6	80.3	14	55.6	5	3.26	45	0
1932	61	70	75.5	52	46.5	89	2.34	64	0
1931	69.9	1	82.3	4	57.5	4	5.83	14	0
1930	63.1	42	77.4	34	49	64	3.35	42	1
1929	59.9	83	71.5	92	48.3	70	3.80	34	0
1928	60.3	79	74.8	61	45.9	93	1.66	77	0
1927	65.2	27	77	38	53.5	17	5.62	17	0
1926	62	59	72.7	79	51.2	33	9.69	3	0
1925	68	6	81.1	9	54.9	9	7.37	7	0
1924	57.9	104	70.2	102	45.6	95	4.72	20	0
1923	64	37	76.4	44	51.6	29	4.12	27	0
1922	66.9	13	82.2	5	52.1	26	0.96	91	1
1921	65.1	31	78.3	27	51.9	27	4.16	26	0
1920	65.4	24	78.8	25	52.3	25	3.57	38	1
1919							4.09	28	10
1915	61.7	63	72.3	86	51	37	4.59	22	0
1913	62.1	58	75.5	52	48.6	68	2.78	55	0
1912	61	70	73.4	70	48.6	68	2.54	63	0
1911	62.8	48	75.2	55	50.5	45	4.19	24	0
1898	61.9	61	76.5	43	47.2	82	0.94	93	0
1897	69	2	84.7	1	53.2	20	0.71	100	0
1896	56.4	111	68	108	44.7	104	2.73	57	0
1895	65.3	26	77.9	31	53.3	18	5.85	13	1

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1931	69.9
1981	69
1897	69
2019	68.6
2005	68.1
1933	68
1925	68
1936	67.9
2023	67.7
1978	67.6

Coldest
Year	Mean, °F
1965	54.1
1896	56.4
1975	56.5
1993	56.6
1951	56.6
1949	56.7
1974	57.4
2006	57.6
1924	57.9
1984	58.1

Wettest
Year	Precipitation, in
2004	14.66
1938	12.00
1926	9.69
1964	8.77
2018	8.51
1965	7.96
1925	7.37
1985	7.06
2016	6.74
2026	6.53

Driest
Year	Precipitation, in
1940	0.09
2023	0.26
2013	0.37
1956	0.38
1999	0.39
2025	0.43
1967	0.44
1984	0.45
1939	0.49
2022	0.59

The hottest, coldest and wettest days

Hottest day: 94°F; 4 September 2026
Coldest night: 44°F; 13 September 2026
Wettest day: 2.04 in; 6 September 2026

Every month, season and year

Months

Seasons

Years

Spencer, IA the day's answers

All-time records

Every answer in words

September 2026 brought 6.53 in of precipitation in Spencer, IA, the wettest September since 2018, 10th wettest of 111.
The hottest day of September 2026 in Spencer, IA: 94°F on Friday 4 September 2026.
The coldest night of September 2026 in Spencer, IA: a low of 44°F on Sunday 13 September 2026.
The wettest day of September 2026 in Spencer, IA: 2.04 in on Sunday 6 September 2026.