Waterloo, IA: Summer

31 August 2026: Summer 2026 averaged 72.6°F in Waterloo, IA, the warmest summer since 2025, tied 44th warmest of 131 (with 1980, 1975 and 1910).

Summer 2026

Mean temperature: 72.6°F; Warmest since 2025; 44th warmest of 131
Precipitation: 16.62 in; Wettest since 2025; 22nd wettest of 131

A normal summer in Waterloo, IA (1991 to 2020): a mean temperature of 71.6°F, between 69.7°F and 73.2°F in eight years of ten and 12.90 in of precipitation, between 8.71 in and 20.19 in in eight years of ten.

The mean temperature of every summer in Waterloo, IA since 1895: 72.6°F in 2026; the highest is 76.7°F, in 1936.

Normal range, 69.7 to 73.2°F

Every year, ranked, as a table

Every summer in Waterloo, 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	72.6	44	82.5	76	62.7	9	16.62	22	0
2025	72.8	37	82.8	66	62.7	9	19.62	12	0
2024	73.3	20	83.7	50	62.8	6	14.41	38	0
2023	73.5	15	86.1	14	61	49	7.27	118	0
2022	73.3	20	84.4	32	62.3	17	14.95	34	0
2021	74.9	7	87.2	8	62.7	9	8.79	104	0
2020	74.9	7	86.3	11	63.5	1	13.72	47	0
2019	72.5	48	83.2	61	61.7	33	12.19	65	0
2018	71.7	67	82.3	78	61.1	47	19.21	13	0
2017	70.4	98	82	88	58.9	98	9.66	94	0
2016	72.2	54	82.3	78	62.1	22	18.20	18	0
2015	70	104	80.3	114	59.7	80	14.37	39	0
2014	70.3	99	80.9	106	59.7	80	13.26	54	0
2013	71.1	78	81.8	92	60.4	60	10.71	83	0
2012	74	12	87.1	9	61	49	4.76	131	0
2011	73	30	83.8	45	62.2	18	9.89	92	0
2010	72.9	34	82.7	70	63.1	5	24.36	4	0
2009	68.3	123	78.4	128	58.1	113	14.46	37	0
2008	71.1	78	82.2	83	60.1	69	15.87	29	0
2007	72	59	82.7	70	61.4	40	20.06	10	0
2006	71.8	64	82.6	72	61	49	10.61	85	0
2005	72	59	83.3	59	60.7	55	14.63	36	0
2004	67.9	128	78.8	126	56.9	123	8.72	106	0
2003	72.3	51	84.3	33	60.4	60	8.76	105	0
2002	73	30	83.8	45	62.1	22	14.98	33	0
2001	71.4	72	82.1	86	60.7	55	12.29	64	0
2000	70.5	93	81	102	60	72	12.02	68	0
1999	72	59	82	88	61.9	27	21.39	7	0
1998	70.8	87	80.9	106	60.6	58	19.63	11	0
1997	70.5	93	81.4	98	59.7	80	12.53	61	0
1996	70.7	89	81.5	96	59.9	74	8.57	109	0
1995	74.3	11	85.3	22	63.4	2	11.79	71	0
1994	69.9	108	80.9	106	58.9	98	19.02	14	0
1993	71.4	72	80.6	111	62.2	18	31.02	1	0
1992	67	129	78.4	128	55.7	128	10.64	84	0
1991	73.1	28	84.3	33	62	25	8.66	107	0
1990	71.1	78	81	102	61.2	45	22.83	5	0
1989	72.1	55	84.7	29	59.6	83	6.40	126	0
1988	75.1	5	88.8	3	61.4	40	7.78	115	0
1987	73.4	17	84.2	39	62.6	12	16.76	21	0
1986	70.5	93	81.1	101	60	72	12.91	57	0
1985	69.1	116	80.9	106	57.3	119	10.32	88	0
1984	71	83	82.8	66	59.1	91	11.29	76	0
1983	74.7	10	86	15	63.4	2	10.50	86	0
1982	69.7	110	80.3	114	59	94	10.44	87	0
1981	70	104	80.2	116	59.8	78	12.88	58	0
1980	72.6	44	83.8	45	61.3	43	15.76	30	0
1979	71.1	78	81	102	61.2	45	18.08	19	0
1978	71.2	75	82.3	78	60.2	67	13.04	55	0
1977	69.7	110	81	102	58.4	109	13.49	49	0
1976	70.7	89	83.7	50	57.8	115	6.34	127	0
1975	72.6	44	83.4	56	61.7	33	9.59	96	0
1974	70.1	101	81.3	99	58.9	98	9.91	91	0
1973	72.8	37	83.1	62	62.6	12	9.08	102	0
1972	69.5	113	79.6	119	59.3	88	13.33	53	0
1971	68.2	124	79.8	118	56.6	126	6.71	123	0
1970	70.7	89	82.1	86	59.2	90	7.28	117	0
1969	68.4	121	79.3	121	57.6	118	14.26	42	0
1968	69.8	109	80.4	112	59.1	91	25.33	2	0
1967	67	129	78.3	130	55.8	127	11.72	72	0
1966	71.2	75	82.5	76	59.9	74	20.37	9	0
1965	68.1	125	79.5	120	56.7	125	16.58	23	0
1964	71	83	82.9	65	59	94	12.35	63	0
1963	71.8	64	83.4	56	60.2	67	16.26	25	0
1962	70	104	80.4	112	59.6	83	14.00	44	0
1961	70.9	85	82.3	78	59.5	86	12.66	60	0
1960	70.1	101	81.6	95	58.5	108	9.61	95	0
1959	72.8	37	83.7	50	61.9	27	14.79	35	0
1958	68.1	125	79	124	57.3	119	11.31	75	0
1957	72.1	55	82.8	66	61.5	38	11.84	70	0
1956	72.3	51	83.8	45	60.8	53	9.58	97	0
1955	74	12	85.9	16	62.2	18	7.13	119	0
1954	73.5	15	84.2	39	62.8	6	11.39	73	0
1953	72.8	37	85.3	22	60.4	60	11.04	82	2
1952	73	30	85	26	61	49	9.37	99	1
1951	69	117	78.9	125	58.7	105	18.98	15	6
1950									31
1949	73.3	20	84	42	62.5	15	6.77	122	0
1948	71.7	67	82.6	72	60.8	53	11.25	78	0
1947	72.1	55	82.6	72	61.6	35	18.78	16	0
1946	69.6	112	80.2	116	58.9	98	12.36	62	0
1945	69	117	79.1	123	58.9	98	11.36	74	0
1944	71.2	75	81.9	90	60.4	60	16.46	24	0
1943	73.3	20	83.3	59	63.4	2	13.68	48	0
1942	70.9	85	81.7	93	60.1	69	22.70	6	0
1941	72.8	37	83.7	50	61.8	29	8.58	108	0
1940	72.9	34	84.3	33	61.5	38	15.56	31	0
1939	72.5	48	83.9	43	61.1	47	9.19	101	0
1938	73.4	17	84.7	29	62.1	22	14.07	43	0
1937	73.8	14	85.8	19	61.8	29	11.27	77	0
1936	76.7	1	90.9	1	62.6	12	11.14	80	0
1935	72.7	42	83.8	45	61.6	35	13.45	51	0
1934	75.5	3	88.2	5	62.8	6	13.03	56	0
1933	74.9	7	88.1	6	61.8	29	6.06	129	0
1932	73.4	17	85.1	25	61.8	29	13.97	45	0
1931	75.5	3	88.7	4	62.2	18	6.59	124	0
1930	73.3	20	85.9	16	60.6	58	10.28	89	0
1929	70.8	87	83.1	62	58.4	109	6.54	125	0
1928	70.5	93	82.2	83	58.8	103	18.42	17	0
1927	68.7	119	81.9	90	55.4	130	6.81	120	0
1926	71.1	78	83.6	54	58.7	105	8.44	111	0
1925	72	59	85.5	21	58.4	109	11.92	69	0
1924	69.4	114	81.7	93	57.2	122	20.61	8	0
1923	73.2	27	85.9	16	60.4	60	16.00	28	0
1922	72	59	85	26	59	94	8.51	110	0
1921	75	6	87.7	7	62.4	16	11.21	79	0
1920	70.3	99	82.6	72	57.9	114	14.33	40	0
1919	72.9	34	84.5	31	61.3	43	9.04	103	0
1918	71.7	67	83.4	56	60.1	69	13.49	49	0
1917	70.1	101	82.8	66	57.3	119	11.05	81	0
1916	73.1	28	86.3	11	59.9	74	5.26	130	0
1915	66.3	131	77.2	131	55.4	130	12.06	67	0
1914	73.3	20	86.2	13	60.4	60	10.20	90	0
1913	73.3	20	85	26	61.6	35	6.11	128	0
1912	69.2	115	80.7	110	57.8	115	15.23	32	0
1911	72.1	55	84.3	33	59.8	78	13.41	52	0
1910	72.6	44	85.7	20	59.5	86	6.79	121	0
1909	72.7	42	83.9	43	61.4	40	9.35	100	0
1908	70.6	92	82.2	83	59	94	12.77	59	0
1907	70.5	93	81.5	96	59.6	83	16.15	27	0
1906	71.3	74	83.5	55	59.1	91	7.52	116	0
1905	71.5	70	83.1	62	59.9	74	14.29	41	0
1904	68.4	121	81.2	100	55.7	128	7.92	113	0
1903	68.1	125	79.3	121	56.9	123	16.18	26	0
1902	68.7	119	78.7	127	58.7	105	25.12	3	0
1901	75.6	2	89.2	2	62	25	7.92	113	0
1900	73	30	85.3	22	60.7	55	16.87	20	0
1899	72.3	51	84.3	33	60.4	60	12.14	66	0
1898	71.8	64	84.3	33	59.3	88	9.44	98	0
1897	70	104	82.3	78	57.8	115	9.73	93	0
1896	71.5	70	84.1	41	58.8	103	13.82	46	0
1895	72.4	50	86.5	10	58.2	112	7.93	112	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1936	76.7
1901	75.6
1934	75.5
1931	75.5
1988	75.1
1921	75
2021	74.9
2020	74.9
1933	74.9
1983	74.7

Coldest
Year	Mean, °F
1915	66.3
1992	67
1967	67
2004	67.9
1965	68.1
1958	68.1
1903	68.1
1971	68.2
2009	68.3
1969	68.4
More years share the last value

Wettest
Year	Precipitation, in
1993	31.02
1968	25.33
1902	25.12
2010	24.36
1990	22.83
1942	22.70
1999	21.39
1924	20.61
1966	20.37
2007	20.06

Driest
Year	Precipitation, in
2012	4.76
1916	5.26
1933	6.06
1913	6.11
1976	6.34
1989	6.40
1929	6.54
1931	6.59
1971	6.71
1949	6.77

The hottest, coldest and wettest days

Hottest day: 96°F; 26 July 2026
Coldest night: 46°F; 15 June 2026
Wettest day: 1.99 in; 20 July 2026

Every month, season and year

Months

Seasons

Years

Waterloo, IA the day's answers

All-time records

Every answer in words

Summer 2026 brought 16.62 in of precipitation in Waterloo, IA, the wettest summer since 2025, 22nd wettest of 131.
The hottest day of summer 2026 in Waterloo, IA: 96°F on Sunday 26 July 2026.
The coldest night of summer 2026 in Waterloo, IA: a low of 46°F on Monday 15 June 2026.
The wettest day of summer 2026 in Waterloo, IA: 1.99 in on Monday 20 July 2026.