Waterloo, IA: August

31 August 2026: August 2026 averaged 71.7°F in Waterloo, IA, the warmest August since 2024, tied 53rd warmest of 132 (with 2001, 2000, 1990 and 1 other year).

August 2026

Mean temperature: 71.7°F; Warmest since 2024; 53rd warmest of 132
Precipitation: 3.60 in; Wettest since 2022; 57th wettest of 132

A normal August in Waterloo, IA (1991 to 2020): a mean temperature of 71.2°F, between 67.5°F and 73.1°F in eight years of ten and 3.65 in of precipitation, between 1.46 in and 7.77 in in eight years of ten.

The mean temperature of every August in Waterloo, IA since 1895: 71.7°F in 2026; the highest is 79.4°F, in 1947.

Normal range, 67.5 to 73.1°F

Every year, ranked, as a table

Every August 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	71.7	53	81.2	93	62.2	25	3.60	57	0
2025	70.7	80	80.8	99	60.6	51	3.09	73	0
2024	73	30	83.9	43	62	27	1.78	102	0
2023	74.8	13	87.2	14	62.4	23	1.12	121	0
2022	73	30	83.5	50	62.5	20	5.45	25	0
2021	74	16	86.2	21	61.9	29	6.69	13	0
2020	73.1	28	86	26	60.3	56	1.33	116	0
2019	70.5	85	81.6	86	59.3	70	3.45	65	0
2018	71	74	81.2	93	60.8	46	6.08	16	0
2017	67.1	124	78.6	124	55.5	122	1.30	117	0
2016	71.9	49	81.7	84	62	27	5.22	32	0
2015	68.8	108	79.4	109	58.2	94	5.55	22	0
2014	71.9	49	82.3	73	61.5	37	2.49	88	0
2013	71.6	58	82.8	62	60.5	53	2.00	98	0
2012	71	74	85.2	32	56.8	111	1.47	111	0
2011	71.4	62	83.5	50	59.4	69	3.21	71	0
2010	74	16	84.3	37	63.6	9	5.46	24	0
2009	68.4	112	78.2	127	58.6	89	5.36	28	0
2008	69.9	94	81.9	79	57.9	102	1.57	107	0
2007	73.1	28	82.5	66	63.6	9	10.31	2	0
2006	71.3	66	81.2	93	61.4	38	2.71	85	0
2005	69.9	94	81.9	79	57.9	102	2.80	82	0
2004	66.3	128	77.2	129	55.5	122	3.85	53	0
2003	73.5	24	86.7	18	60.2	57	0.19	132	0
2002	69.9	94	80.9	97	58.8	83	5.53	23	0
2001	71.7	53	82.6	65	60.8	46	2.44	90	0
2000	71.7	53	82.5	66	60.9	44	1.56	108	0
1999	69.1	103	79.1	115	59	79	4.30	48	0
1998	71.8	51	81.3	89	62.4	23	10.53	1	0
1997	68.6	110	79.1	115	58	98	4.62	43	0
1996	70.5	85	82.4	71	58.6	89	1.77	103	0
1995	77.3	4	87.5	11	67.2	2	4.97	36	0
1994	67.5	121	78.9	119	56.1	117	7.56	10	0
1993	72.4	42	81.7	84	63.1	15	9.65	5	0
1992	65	132	77.1	130	52.8	132	2.84	81	0
1991	71.6	58	82.5	66	60.7	49	4.88	39	0
1990	71.7	53	81.5	88	61.9	29	5.22	32	0
1989	71.6	58	83.9	43	59.3	70	2.33	94	0
1988	76.4	7	89.4	4	63.4	14	3.15	72	0
1987	69.9	94	79.6	108	60.1	59	8.51	6	0
1986	66.5	127	77.9	128	55	125	2.27	95	0
1985	67.6	119	78.9	119	56.3	113	4.22	49	0
1984	72.4	42	85.3	31	59.5	67	0.38	130	0
1983	77.3	4	88.7	7	66	3	1.30	117	0
1982	70.2	89	80.5	101	60	61	3.29	67	0
1981	69	106	79.1	115	59	79	4.13	50	0
1980	73	30	83.4	55	62.7	17	5.38	27	0
1979	71.8	51	80.9	97	62.7	17	5.33	29	0
1978	71.4	62	83.7	46	59.2	75	3.60	57	0
1977	65.9	130	76.2	132	55.6	120	5.45	25	0
1976	69.6	101	82.9	61	56.3	113	0.68	125	0
1975	72.8	37	83.5	50	62.2	25	4.53	44	0
1974	68.2	115	79	118	57.5	107	2.87	79	0
1973	73.8	20	83.8	45	63.8	8	2.72	84	0
1972	71.1	71	80.5	101	61.6	35	3.71	55	0
1971	66.7	126	80.2	104	53.2	131	0.43	129	0
1970	70	92	81.3	89	58.7	85	0.99	123	0
1969	70.6	84	83.2	58	58	98	0.54	127	0
1968	69.4	102	79.4	109	59.5	67	8.07	7	0
1967	65.2	131	76.6	131	53.8	128	3.95	52	0
1966	67.4	122	79.3	113	55.6	120	5.97	17	0
1965	67.8	118	79.4	109	56.2	115	7.08	11	0
1964	68.1	116	80.1	106	56.2	115	4.86	40	0
1963	69.9	94	81.3	89	58.5	91	3.01	76	0
1962	70.7	80	82.5	66	58.9	82	3.74	54	0
1961	71.7	53	83.5	50	59.8	63	1.51	109	0
1960	72.8	37	83.7	46	61.8	31	5.12	35	0
1959	75.9	9	85.7	29	66	3	3.41	66	0
1958	70.9	77	83.1	60	58.7	85	2.59	87	0
1957	71.5	61	82.1	77	60.9	44	4.94	37	0
1956	71.3	66	82	78	60.6	51	3.24	70	0
1955	75.7	10	88.7	7	62.7	17	0.37	131	0
1954	71.1	71	81.6	86	60.5	53	5.92	19	0
1953	72	47	85.5	30	58.5	91	1.94	99	0
1952	69.9	94	81.2	93	58.7	85	3.03	75	1
1951	69.1	103	78.7	122	59.3	70	5.86	20	2
1950	67.6	119	79.4	109	55.7	119	0.67	126	1
1949	72.8	37	84.4	36	61.1	42	0.45	128	0
1948	73.2	26	84.6	35	61.8	31	1.51	109	0
1947	79.4	1	90.6	2	68.3	1	3.08	74	0
1946	67.4	122	78.4	126	56.5	112	1.17	120	0
1945	71.2	70	81.3	89	61.2	41	5.94	18	0
1944	71.1	71	81.8	83	60.5	53	5.78	21	0
1943	73	30	82.8	62	63.1	15	3.51	61	0
1942	70.8	79	81.9	79	59.6	65	4.38	47	0
1941	74	16	86.1	24	61.8	31	2.37	93	0
1940	70	92	79.3	113	60.8	46	3.29	67	0
1939	70.7	80	82.8	62	58.5	91	2.42	91	0
1938	75.3	11	87.1	15	63.6	9	3.46	64	0
1937	77	6	88.9	6	65	6	3.59	59	0
1936	78.2	2	91.8	1	64.5	7	5.30	31	0
1935	73	30	84.3	37	61.7	34	1.88	101	0
1934	70.5	85	82.3	73	58.7	85	5.31	30	0
1933	70.4	88	83.5	50	57.2	110	1.60	106	0
1932	72.3	45	83.2	58	61.4	38	7.58	9	0
1931	72.8	37	86.3	20	59.3	70	2.88	78	0
1930	73.8	20	87.5	11	60.1	59	0.75	124	0
1929	70.7	80	83.3	56	58	98	2.14	97	0
1928	72.1	46	84.1	40	60.2	57	10.06	3	0
1927	67	125	80.5	101	53.5	129	2.75	83	0
1926	73.2	26	85	33	61.4	38	2.48	89	0
1925	72	47	86.5	19	57.5	107	2.66	86	0
1924	71.3	66	83.3	56	59.3	70	6.81	12	0
1923	70.1	90	82.3	73	57.9	102	9.94	4	0
1922	73.4	25	86.9	16	59.9	62	1.41	113	0
1921	71.4	62	83.6	48	59.1	77	4.68	41	0
1920	68.5	111	81.9	79	55	125	4.43	45	0
1919	71.4	62	84.8	34	57.9	102	1.67	105	0
1918	74.9	12	87.3	13	62.5	20	1.40	114	0
1917	69.8	100	84.2	39	55.3	124	1.76	104	0
1916	74	16	88.3	9	59.8	63	1.12	121	0
1915	66.1	129	78.7	122	53.5	129	2.25	96	0
1914	73	30	86.9	16	59	79	1.42	112	0
1913	73.8	20	86	26	61.6	35	2.40	92	0
1912	68.9	107	79.8	107	58.1	96	6.40	14	0
1911	69.1	103	80.2	104	58	98	6.33	15	0
1910	72.4	42	84.1	40	60.7	49	4.11	51	0
1909	76.3	8	89.1	5	63.6	9	1.94	99	0
1908	70.1	90	82.5	66	57.7	106	3.61	56	0
1907	70.9	77	82.3	73	59.6	65	4.94	37	0
1906	74.8	13	86	26	63.5	13	2.87	79	0
1905	74.3	15	86.2	21	62.5	20	4.41	46	0
1904	68.4	112	82.4	71	54.5	127	2.93	77	0
1903	68	117	78.6	124	57.5	107	5.17	34	0
1902	68.8	108	78.8	121	58.8	83	7.70	8	0
1901	73	30	87.9	10	58.2	94	1.40	114	0
1900	77.5	3	89.6	3	65.4	5	3.48	62	0
1899	73.6	23	86.2	21	61.1	42	3.59	59	0
1898	71	74	84	42	58.1	96	3.47	63	0
1897	68.4	112	80.8	99	56	118	1.25	119	0
1896	71.3	66	83.6	48	59.1	77	3.29	67	0
1895	72.7	41	86.1	24	59.2	75	4.68	41	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1947	79.4
1936	78.2
1900	77.5
1995	77.3
1983	77.3
1937	77
1988	76.4
1909	76.3
1959	75.9
1955	75.7

Coldest
Year	Mean, °F
1992	65
1967	65.2
1977	65.9
1915	66.1
2004	66.3
1986	66.5
1971	66.7
1927	67
2017	67.1
1966	67.4
More years share the last value

Wettest
Year	Precipitation, in
1998	10.53
2007	10.31
1928	10.06
1923	9.94
1993	9.65
1987	8.51
1968	8.07
1902	7.70
1932	7.58
1994	7.56

Driest
Year	Precipitation, in
2003	0.19
1955	0.37
1984	0.38
1971	0.43
1949	0.45
1969	0.54
1950	0.67
1976	0.68
1930	0.75
1970	0.99

The hottest, coldest and wettest days

Hottest day: 90°F; 31 August 2026
Coldest night: 50°F; 28 August 2026
Wettest day: 0.65 in; 13 August 2026

Every month, season and year

Months

Seasons

Years

Waterloo, IA the day's answers

All-time records

Every answer in words

August 2026 brought 3.60 in of precipitation in Waterloo, IA, the wettest August since 2022, tied 57th wettest of 132 (with 1978).
The hottest day of August 2026 in Waterloo, IA: 90°F on Monday 31 August 2026.
The coldest night of August 2026 in Waterloo, IA: a low of 50°F on Friday 28 August 2026.
The wettest day of August 2026 in Waterloo, IA: 0.65 in on Thursday 13 August 2026.