Waterloo, IA: May

31 May 2026: May 2026 averaged 60.9°F in Waterloo, IA, the warmest May since 2025, tied 45th warmest of 132 (with 2025 and 2001).

May 2026

Mean temperature: 60.9°F; Warmest since 2025; 45th warmest of 132
Precipitation: 2.76 in; Driest since 2025; 38th driest of 132

A normal May in Waterloo, IA (1991 to 2020): a mean temperature of 60°F, between 56.8°F and 64.6°F in eight years of ten and 4.28 in of precipitation, between 2.61 in and 7.01 in in eight years of ten.

The mean temperature of every May in Waterloo, IA since 1895: 60.9°F in 2026; the highest is 70.2°F, in 1934.

Normal range, 56.8 to 64.6°F

Every year, ranked, as a table

Every May 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	60.9	45	74.1	33	47.8	78	2.76	95	0
2025	60.9	45	73.2	42	48.5	61	2.37	102	0
2024	62.8	27	75.1	25	50.4	36	10.04	2	0
2023	64.4	15	78.4	7	50.3	38	1.75	122	0
2022	62.2	34	73.4	41	51.1	27	4.08	61	0
2021	59.6	73	70.6	77	48.6	57	3.48	71	0
2020	59	81	69.8	91	48.2	65	5.47	32	0
2019	57.9	94	68.9	102	46.9	88	6.87	15	0
2018	66.1	4	77.6	10	54.5	3	3.02	89	0
2017	57.9	94	69.9	90	45.8	102	3.52	70	0
2016	59.9	65	72.1	52	47.7	81	3.24	78	0
2015	60.8	48	70.4	83	51.3	25	4.87	46	0
2014	60.1	61	72	55	48.3	64	2.66	98	0
2013	59.2	80	69.8	91	48.6	57	10.81	1	0
2012	65.1	10	77.9	9	52.4	16	3.20	82	0
2011	59.3	77	70.8	70	47.9	75	3.65	66	0
2010	60.6	52	71.8	58	49.5	44	4.44	56	0
2009	59.7	69	70.7	76	48.7	55	4.11	60	0
2008	56.8	109	68.7	104	44.8	113	6.25	24	0
2007	64.5	14	76.3	14	52.6	13	4.65	50	0
2006	59.8	67	71.1	66	48.5	61	1.72	123	0
2005	56.6	110	67.7	112	45.5	106	3.22	81	0
2004	60.7	51	72.4	50	49.1	51	8.12	4	0
2003	58.6	87	70.8	70	46.5	96	5.06	41	0
2002	57.7	100	70.3	84	45.2	111	3.29	75	0
2001	60.9	45	70.6	77	51.2	26	5.44	33	0
2000	62.7	29	74.4	31	50.9	30	6.93	13	0
1999	61.7	38	71.4	62	52	20	6.66	18	0
1998	65.5	8	77.3	13	53.6	8	3.08	87	0
1997	54.6	122	66.5	119	42.8	125	2.68	97	0
1996	56.5	112	65.4	128	47.6	83	5.36	34	0
1995	58.4	88	69.7	95	47.1	86	3.15	84	0
1994	61.5	41	74.9	28	48.1	69	2.17	107	0
1993	61	43	71.3	64	50.6	34	6.11	27	0
1992	60.5	54	74.1	33	47	87	0.82	131	0
1991	63.6	21	72.9	45	54.4	4	7.72	6	0
1990	56	115	67.3	113	44.8	113	5.06	41	0
1989	58.3	90	71.1	66	45.5	106	1.54	126	0
1988	65	11	79.5	3	50.6	34	1.61	124	0
1987	64.9	12	77.6	10	52.2	19	2.93	91	0
1986	60.4	56	70.9	68	49.9	41	6.33	22	0
1985	63.2	24	75.7	20	50.8	32	2.32	103	0
1984	57.8	96	68.7	104	46.9	88	4.77	49	0
1983	55.9	120	65.6	125	46.2	99	5.28	39	0
1982	64.4	15	73.8	37	54.9	2	6.66	18	0
1981	57.8	96	69.6	97	46	100	2.05	110	0
1980	59.7	69	72.9	45	46.6	93	5.36	34	0
1979	58.2	91	70.6	77	45.7	105	3.83	64	0
1978	60	64	70.8	70	49.3	47	2.69	96	0
1977	65.5	8	77.5	12	53.4	10	1.47	127	0
1976	56.6	110	68.8	103	44.4	117	2.21	106	0
1975	63.1	26	74.8	29	51.4	23	1.93	116	0
1974	56	115	65.2	129	46.7	91	5.35	36	0
1973	56.5	112	66.7	116	46.3	98	7.23	8	0
1972	60.8	48	72.6	47	49	52	3.35	73	0
1971	53.5	131	66.2	122	40.8	132	5.51	31	0
1970	61.6	39	72.5	49	50.7	33	7.24	7	0
1969	59	81	70.1	87	47.9	75	6.76	17	0
1968	54.1	128	65.6	125	42.6	126	1.95	115	0
1967	54.6	122	66.3	121	42.9	124	1.89	118	0
1966	54.6	122	67.3	113	41.8	128	4.79	48	0
1965	60.2	58	72.2	51	48.2	65	5.24	40	0
1964	63.2	24	75.4	22	50.9	30	5.01	44	0
1963	59.3	77	70.8	70	47.7	81	2.31	104	0
1962	65.8	6	75.6	21	56	1	6.62	20	0
1961	56	115	68	109	44.1	119	3.12	85	0
1960	58.4	88	69.2	100	47.5	84	7.18	9	0
1959	62.2	34	71.8	58	52.6	13	4.59	54	0
1958	60.1	61	73.6	39	46.6	93	2.64	99	0
1957	57.5	102	67.2	115	47.8	78	4.14	59	0
1956	59.9	65	71.7	61	48	73	3.23	79	0
1955	62.8	27	75.2	23	50.4	36	3.65	66	0
1954	55	121	66.4	120	43.7	122	5.29	38	0
1953	60.5	54	72.1	52	49	52	1.47	127	0
1952	58.7	86	70	89	47.4	85	5.35	36	0
1951	62.3	33	73.7	38	51.1	27	2.95	90	1
1950	59.5	75	69.6	97	49.4	46	4.31	57	0
1949	62.5	31	73.5	40	51.4	23	2.04	112	0
1948	58	92	68.3	107	47.8	78	3.26	77	0
1947	54.5	125	65.6	125	43.4	123	4.81	47	0
1946	56	115	66.7	116	45.3	110	4.62	51	0
1945	54.5	125	65.1	130	43.8	121	6.21	25	0
1944	64	19	74.6	30	53.5	9	5.03	43	0
1943	57.4	104	68.4	106	46.4	97	4.07	62	0
1942	59	81	69.8	91	48.1	69	3.58	68	0
1941	66.4	2	78.8	5	54.1	6	1.90	117	0
1940	57.8	96	70.5	81	45.1	112	3.23	79	0
1939	66	5	79.6	2	52.3	17	3.27	76	0
1938	59.7	69	70.1	87	49.2	48	3.88	63	0
1937	61	43	71.8	58	50.2	39	2.88	92	0
1936	66.4	2	78.7	6	54.2	5	1.55	125	0
1935	56	115	66.2	122	45.8	102	2.11	109	0
1934	70.2	1	86.5	1	53.8	7	0.65	132	0
1933	60.2	58	70.3	84	50	40	7.17	10	0
1932	62.1	36	75	26	49.2	48	4.62	51	0
1931	57.5	102	70.5	81	44.5	116	2.40	101	0
1930	60.3	57	72	55	48.6	57	4.55	55	0
1929	57.3	105	69.2	100	45.5	106	2.13	108	0
1928	62.7	29	76	18	49.5	44	3.10	86	0
1927	58.9	84	69.7	95	48.1	69	6.77	16	0
1926	64.4	15	79.3	4	49.6	43	2.82	93	0
1925	57.2	107	73.2	42	41.2	130	1.12	130	0
1924	54	129	66.6	118	41.4	129	2.81	94	0
1923	60.2	58	73.9	36	46.6	93	2.23	105	0
1922	64.4	15	76.3	14	52.5	15	5.53	30	0
1921	63.8	20	76	18	51.5	22	3.42	72	0
1920	59.3	77	72	55	46.7	91	3.55	69	0
1919	57.8	96	69.8	91	45.8	102	2.02	114	0
1918	62.5	31	75.2	23	49.7	42	7.17	10	0
1917	53.9	130	65.7	124	42	127	2.62	100	0
1916	59.7	69	71.3	64	48.2	65	3.20	82	0
1915	54.5	125	64.3	131	44.6	115	7.17	10	0
1914	61.6	39	74	35	49.2	48	3.73	65	0
1913	58	92	68	109	48	73	6.91	14	0
1912	60.6	52	72.6	47	48.6	57	1.78	121	0
1911	64.6	13	76.3	14	52.8	12	6.27	23	0
1910	56.2	114	68	109	44.4	117	2.05	110	0
1909	57	108	68.1	108	46	100	1.86	119	0
1908	59.6	73	70.3	84	48.9	54	6.49	21	0
1907	52.6	132	64.2	132	41	131	3.06	88	0
1906	60.1	61	72.1	52	48.1	69	3.35	73	0
1905	57.6	101	69.6	97	45.5	106	5.66	29	0
1904	58.8	85	70.8	70	46.9	88	4.62	51	0
1903	61.5	41	70.9	68	52	20	7.85	5	0
1902	63.3	23	74.3	32	52.3	17	8.54	3	0
1901	60.8	48	73.2	42	48.4	63	1.79	120	0
1900	63.6	21	76.3	14	51	29	1.37	129	0
1899	59.8	67	71.4	62	48.2	65	6.08	28	0
1898	59.4	76	70.8	70	47.9	75	4.22	58	0
1897	57.3	105	70.6	77	43.9	120	2.03	113	0
1896	65.8	6	78.4	7	53.1	11	6.13	26	0
1895	61.9	37	75	26	48.7	55	4.91	45	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
1934	70.2
1941	66.4
1936	66.4
2018	66.1
1939	66
1962	65.8
1896	65.8
1998	65.5
1977	65.5
2012	65.1

Coldest
Year	Mean, °F
1907	52.6
1971	53.5
1917	53.9
1924	54
1968	54.1
1947	54.5
1945	54.5
1915	54.5
1997	54.6
1967	54.6
More years share the last value

Wettest
Year	Precipitation, in
2013	10.81
2024	10.04
1902	8.54
2004	8.12
1903	7.85
1991	7.72
1970	7.24
1973	7.23
1960	7.18
1933	7.17
More years share the last value

Driest
Year	Precipitation, in
1934	0.65
1992	0.82
1925	1.12
1900	1.37
1977	1.47
1953	1.47
1989	1.54
1936	1.55
1988	1.61
2006	1.72

The hottest, coldest and wettest days

Hottest day: 89°F; 27 May 2026
Coldest night: 28°F; 2 May 2026
Wettest day: 0.83 in; 18 May 2026

Every month, season and year

Months

Seasons

Years

Waterloo, IA the day's answers

All-time records

Every answer in words

May 2026 brought 2.76 in of precipitation in Waterloo, IA, the driest May since 2025, 38th driest of 132.
The hottest day of May 2026 in Waterloo, IA: 89°F on Wednesday 27 May 2026.
The coldest night of May 2026 in Waterloo, IA: a low of 28°F on Saturday 2 May 2026.
The wettest day of May 2026 in Waterloo, IA: 0.83 in on Monday 18 May 2026.