Ontario, OR: May

31 May 2026: May 2026 averaged 63.7°F in Ontario, OR, the warmest May since 2023, 7th warmest of 71.

May 2026

Mean temperature: 63.7°F; Warmest since 2023; 7th warmest of 71
Precipitation: 0.02 in; Driest on record; Driest of 78, provisional

A normal May in Ontario, OR (1991 to 2020): 1.08 in of precipitation, between 0.24 in and 2.39 in in eight years of ten.

The mean temperature of every May in Ontario, OR since 1946: 63.7°F in 2026; the highest is 66.1°F, in 2023.

Every year, ranked, as a table

Every May in Ontario, OR from 1946 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	63.7	7	79.6	10	47.8	10	0.02	78	0
2025	62.2	18	77	25	47.4	16	0.10	73	0
2024	60.1	38	74.6	44	45.5	35	1.21	26	0
2023	66.1	1	79.7	9	52.4	1	1.35	20	0
2022	57.8	56	71.4	63	44.3	48	1.02	29	0
2021	62.1	19	75.8	34	48.4	7	0.59	49	0
2020	61.9	23	76.4	30	47.5	14	1.81	11	0
2019	62.3	17	75.6	36	48.9	5	2.52	5	0
2018	66	2	80	7	52	2	0.95	35	0
2017	60.5	36	75	40	45.9	30	1.28	22	2
2016	62.4	16	76.6	29	48.2	8	0.30	65	0
2015	62.9	12	76.9	26	49	4	1.67	12	0
2014	62	21	77.4	19	46.5	24	0.42	58	0
2013	62	21	77.2	20	46.8	21	0.53	52	0
2012	59	48	73.1	54	44.9	40	1.21	26	0
2011	55.5	69	68.3	69	42.7	68	1.99	8	0
2010	54	70	67.2	72	40.8	75	1.34	21	0
2009	61.1	29	76	32	46.2	28	1.42	16	1
2008	61.2	28	75.4	37	47	19	0.34	62	0
2007	62.9	12	78.1	16	47.6	13	0.44	57	0
2006	61.1	29	76.4	30	45.7	33	0.57	50	0
2005	59.3	46	72.3	60	46.2	28	2.93	3	1
2004	58.4	53	71.2	65	45.7	33	1.26	23	0
2003	60.6	35	74.6	44	46.6	22	1.54	13	0
2002	59.9	39	74.9	41	44.8	42	0.06	77	0
2001	61.1	29	77.1	23	45.1	38	0.22	67	1
2000	60.9	33	74	49	47.7	11	0.32	64	0
1999	57.3	61	70.9	66	43.7	54	0.25	66	0
1998	56.8	65	67.6	71	45.9	30	4.39	1	0
1996	57	64	69.8	67	44.3	48	2.34	6	2
1995			73.2	52			0.95	35	5
1994	61.7	25	77.2	20	46.6	22			1
1993					48.1	9	0.81	43	4
1992					48.7	6	0.17	68	5
1991					44.5	45	2.06	7	5
1990					44.1	52	1.82	10	7
1989					43.4	58	0.91	39	5
1988					43.6	56	0.94	38	6
1987					46.5	24	1.08	28	6
1986	59.3	46	75.9	33	43.5	57	0.41	59	3
1985	61.3	26	77.2	20	45.4	36	0.97	34	0
1984	57.4	60	71.4	63	43.4	58	1.24	24	0
1983	59.7	43	75.7	35	43.4	58	1.02	29	1
1982	58.3	54	73.6	50	42.9	66	0.67	47	0
1981	58.7	51	72.5	58	44.8	42	0.81	43	0
1980	59.6	45	74.5	47	44.6	44	0.95	35	0
1979	62.1	19	76.8	27	47.1	18	0.74	46	1
1978	57.8	56	72.4	59	43.3	61	0.12	72	0
1977	55.9	68	69.2	68	42.7	68	1.40	17	0
1976	61.8	24	80.5	6	43.3	61	0.15	70	1
1975	57.2	63	73	55	41.3	72	0.10	73	0
1974	57.7	58	74.2	48	41.2	73	0.16	69	0
1973	63.2	9	81.9	4	44.5	45	0.89	40	0
1972	63.4	8	81.7	5	45.1	38	0.09	76	0
1971	62.5	15	79.2	13	45.8	32	0.10	73	0
1970	59.9	39	77.6	17	42.2	70	0.51	55	0
1969	64.8	4	82	3	47.5	14	1.01	32	0
1968	59.9	39	76.8	27	42.9	66	0.52	53	0
1967	60.4	37	77.6	17	43.1	64	1.24	24	0
1966	63.8	6	83.7	2	43.8	53	0.13	71	0
1965	59	48	74.9	41	43.1	64	0.52	53	0
1964	58.1	55	74.7	43	41.5	71	0.89	40	0
1963	62.9	12	79.3	12	46.4	27	0.37	61	0
1962	58.7	51	73	55	44.4	47	1.90	9	0
1961	61.1	29	78.5	14	43.7	54	0.34	62	0
1960	57.3	61	73.5	51	41.1	74	1.46	14	0
1959	56.6	66	72.9	57	40.3	77	1.00	33	0
1958	66	2	84.6	1	47	19	1.37	19	1
1957	60.8	34	74.6	44	47.2	17	2.74	4	1
1956	63	10	79.5	11	46.5	24	1.46	14	0
1954	61.3	26	77.1	23	45.4	36	0.77	45	0
1953	53.9	71	68	70	39.8	78	3.18	2	0
1952	59.8	42	75.3	38	44.3	48	0.54	51	0
1951	59	48	73.2	52	44.9	40	1.02	29	0
1950	56.4	67	72.2	61	40.5	76	0.60	48	0
1949	63	10	78.3	15	47.7	11	1.40	17	0
1948	57.6	59	71.8	62	43.3	61	0.89	40	0
1947	64.8	4	80	7	49.7	3	0.50	56	0
1946	59.7	43	75.1	39	44.2	51	0.39	60	1

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2023	66.1
2018	66
1958	66
1969	64.8
1947	64.8
1966	63.8
2026	63.7
1972	63.4
1973	63.2
1956	63
More years share the last value

Coldest
Year	Mean, °F
1953	53.9
2010	54
2011	55.5
1977	55.9
1950	56.4
1959	56.6
1998	56.8
1996	57
1975	57.2
1999	57.3
More years share the last value

Wettest
Year	Precipitation, in
1998	4.39
1953	3.18
2005	2.93
1957	2.74
2019	2.52
1996	2.34
1991	2.06
2011	1.99
1962	1.90
1990	1.82

Driest
Year	Precipitation, in
2026	0.02
2002	0.06
1972	0.09
2025	0.10
1975	0.10
1971	0.10
1978	0.12
1966	0.13
1976	0.15
1974	0.16

The hottest, coldest and wettest days

Hottest day: 92°F; 25 May 2026
Coldest night: 36°F; 1 May 2026
Wettest day: 0.02 in; 27 May 2026

Every month, season and year

Months

Seasons

Years

Ontario, OR the day's answers

All-time records

Every answer in words

May 2026 brought 0.02 in of precipitation in Ontario, OR, the driest May on record, in 78 years since 1946 (1955 excluded: 31 of 31 days missing; 1994 excluded: 24 of 31 days missing; 1997 excluded: 31 of 31 days missing); provisional.
The hottest day of May 2026 in Ontario, OR: 92°F on Monday 25 May 2026.
The coldest night of May 2026 in Ontario, OR: a low of 36°F on Friday 1 May 2026.
The wettest day of May 2026 in Ontario, OR: 0.02 in on Wednesday 27 May 2026.