Ontario, OR: Summer

31 August 2026: Summer 2026 averaged 74.9°F in Ontario, OR, the warmest summer since 2025, tied 15th warmest of 68 (with 2006).

Summer 2026

Mean temperature: 74.9°F; Warmest since 2025; 15th warmest of 68
Precipitation: 1.37 in; Wettest since 2025; 27th wettest of 78

A normal summer in Ontario, OR (1991 to 2020): 0.74 in of precipitation, between 0.34 in and 2.23 in in eight years of ten.

The mean temperature of every summer in Ontario, OR since 1946: 74.9°F in 2026; the highest is 79.4°F, in 2021.

Every year, ranked, as a table

Every summer in Ontario, OR from 1945 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	74.9	15	90.9	35	58.8	12	1.37	27	0
2025	75.2	11	90.5	39	59.9	6	1.52	21	0
2024	77	4	93.9	11	60.2	5	0.95	43	0
2023	76.3	8	91.5	28	61	3	3.61	1	0
2022	77.7	3	93.8	12	61.7	2	1.35	29	0
2021	79.4	1	95.8	3	63.1	1	1.41	25	0
2020	74.3	28	89.7	44	58.8	12	2.25	6	0
2019	75.1	12	91.1	32	59.2	10	0.25	76	0
2018	74.7	20	91	33	58.5	15	0.42	65	1
2017	76.1	9	92.6	21	59.6	8	0.63	56	0
2016	74.2	29	90.7	36	57.8	20	0.34	72	0
2015	76.4	6	93.1	17	59.7	7	0.72	53	0
2014	74.8	17	90.3	40	59.2	10	0.81	50	0
2013	76.5	5	92.8	18	60.3	4	0.67	55	0
2012	74.7	20	91.3	29	58	18	0.28	74	0
2011	71.8	51	87.6	63	56.1	32	0.97	40	0
2010	71.1	58	86.7	67	55.6	35	2.22	8	0
2009	72.7	42	87.8	60	57.6	21	2.70	2	0
2008	73.3	34	89.5	46	57	24	0.59	58	0
2007	75.1	12	91.7	26	58.5	15	0.95	43	0
2006	74.9	15	91.3	29	58.6	14	0.39	68	0
2005	71.6	55	88.9	54	54.2	56	0.98	39	5
2004	72.8	39	89	53	56.7	27	0.85	46	6
2003	75.9	10	92.4	23	59.4	9	0.54	59	4
2002	74.1	30	90.2	42	57.9	19	0.82	48	0
2001	72.8	39	88.5	56	57	24	0.75	52	0
2000	73.4	33	89.9	43	57	24	0.33	73	1
1999	70.4	64	85.8	70	54.9	43	1.04	35	5
1998	73.3	34	89.2	51	57.5	22	2.07	11	5
1997									42
1996			91.3	29			0.43	63	10
1995			86.3	69			0.42	65	12
1994			92.1	24			0.35	70	14
1993					49.8	76	2.27	5	13
1992					56.1	32			21
1991					55.5	36	1.01	37	18
1990					57.1	23	1.18	32	14
1989					54.9	43	1.78	18	19
1988					56.4	29	0.50	61	20
1987					53.7	63	0.52	60	14
1986					55.2	41	0.38	69	20
1985	74.4	27	93.2	16	55.5	36	0.82	48	8
1984	72.1	49	89.5	46	54.7	48	2.01	14	0
1983	70.8	61	87.9	58	53.7	63	2.19	9	2
1982	71.8	51	89.1	52	54.7	48	1.41	25	3
1981	72.3	47	90.7	36	53.9	61	1.82	17	0
1980	70.1	66	88.1	57	52.1	73	1.02	36	0
1979	73.3	34	91	33	55.5	36	2.02	12	0
1978	70.8	61	89.6	45	52.1	73	1.37	27	0
1977	74.6	24	92.7	19	56.6	28	0.96	41	0
1976	69.9	67	87.5	65	52.3	71	1.63	19	0
1975	71.7	54	88.7	55	54.7	48	2.16	10	0
1974	73.6	31	93.3	15	53.8	62	0.70	54	0
1973	74.7	20	94.9	6	54.4	54	0.04	78	0
1972	74.5	25	94.1	9	54.9	43	1.46	22	0
1971	75.1	12	94.9	6	55.4	39	1.14	33	0
1970	74.8	17	95.3	5	54.5	53	2.02	12	1
1969	73.3	34	93.4	14	53.2	67	1.22	31	0
1968	73.3	34	91.7	26	54.9	43	2.64	3	0
1967	76.4	6	96.4	2	56.4	29	1.42	23	0
1966	73.5	32	93.5	13	53.6	66	0.62	57	0
1965	72.5	43	90.6	38	54.4	54	2.23	7	0
1964	71.2	56	89.5	46	53	69	2.49	4	0
1963	72	50	90.3	40	53.7	63	1.98	15	1
1962	72.4	44	91.9	25	53	69	0.28	74	0
1961	78.5	2	98.7	1	58.4	17	0.48	62	1
1960	74.8	17	95.4	4	54.1	59	0.80	51	1
1959	74.7	20	94.8	8	54.6	52	0.42	65	0
1958	74.5	25	94.1	9	55	42	0.99	38	1
1957	72.4	44	92.5	22	52.3	71	0.43	63	0
1956	72.3	47	92.7	19	51.9	75	1.57	20	0
1954	69	68	84.7	71	53.2	67	0.92	45	0
1953	70.3	65	86.5	68	54.1	59	1.23	30	0
1952	71	59	87.9	58	54.2	56	1.42	23	0
1951	71	59	87.8	60	54.2	56	0.96	41	0
1950	71.2	56	87.7	62	54.7	48	1.05	34	0
1949	72.8	39	89.5	46	56.1	32	0.35	70	0
1948	71.8	51	87.6	63	56.3	31	0.85	46	8
1947	70.8	61	86.9	66	54.8	47	1.98	15	0
1946	72.4	44	89.4	50	55.4	39	0.16	77	0
1945									30

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2021	79.4
1961	78.5
2022	77.7
2024	77
2013	76.5
2015	76.4
1967	76.4
2023	76.3
2017	76.1
2003	75.9

Coldest
Year	Mean, °F
1954	69
1976	69.9
1980	70.1
1953	70.3
1999	70.4
1983	70.8
1978	70.8
1947	70.8
1952	71
1951	71

Wettest
Year	Precipitation, in
2023	3.61
2009	2.70
1968	2.64
1964	2.49
1993	2.27
2020	2.25
1965	2.23
2010	2.22
1983	2.19
1975	2.16

Driest
Year	Precipitation, in
1973	0.04
1946	0.16
2019	0.25
2012	0.28
1962	0.28
2000	0.33
2016	0.34
1994	0.35
1949	0.35
1986	0.38

The hottest, coldest and wettest days

Hottest day: 104°F; 20 July 2026
Coldest night: 40°F; 11 June 2026
Wettest day: 1.00 in; 26 June 2026

Every month, season and year

Months

Seasons

Years

Ontario, OR the day's answers

All-time records

Every answer in words

Summer 2026 brought 1.37 in of precipitation in Ontario, OR, the wettest summer since 2025, tied 27th wettest of 78 (with 1978).
The hottest day of summer 2026 in Ontario, OR: 104°F on Monday 20 July 2026.
The coldest night of summer 2026 in Ontario, OR: a low of 40°F on Thursday 11 June 2026.
The wettest day of summer 2026 in Ontario, OR: 1.00 in on Friday 26 June 2026.