Weather on July 3
Ontario, CA
55 Years of Data
Avg High
90°F
Avg Low
60°F
Warmest
1973
84°F avg
Coldest
1979
66°F avg
About This Date
July 3rd in Ontario, CA typically brings hot summer weather, with average highs around 90°F and lows near 60°F — a 30°F daily swing. Over 42 years of records, the warmest July 3rd was in 1973 (84°F average), while the coldest was 1979 (66°F) — a 18°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
Planning for July 3rd in Ontario, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 59° | 73° | — | — |
| 2024 | 98° | 67° | 82° | — | — |
| 2023 | 92° | 63° | 77° | — | — |
| 2022 | 84° | 60° | 72° | — | — |
| 2021 | 97° | 69° | 83° | — | — |
| 2020 | 96° | 61° | 78° | — | — |
| 2019 | 89° | 65° | 77° | — | — |
| 2018 | 86° | 62° | 74° | — | — |
| 2017 | 98° | 59° | 79° | — | — |
| 2016 | 87° | 59° | 73° | — | — |
| 2015 | 93° | 66° | 80° | — | — |
| 2014 | 99° | 64° | 81° | — | — |
| 2013 | 94° | 67° | 80° | — | — |
| 2012 | 83° | 61° | 72° | — | — |
| 2011 | 98° | 65° | 81° | — | — |
| 2010 | 81° | 58° | 69° | — | — |
| 2009 | 91° | 61° | 76° | — | — |
| 2008 | 97° | 64° | 80° | — | — |
| 2007 | 101° | 66° | 83° | — | — |
| 2006 | 97° | 70° | 83° | — | — |
| 2005 | 89° | 58° | 73° | — | — |
| 2004 | 79° | 59° | 69° | — | — |
| 2003 | 99° | 66° | 82° | — | — |
| 2002 | 84° | 59° | 72° | — | — |
| 2001 | 95° | 69° | 82° | — | — |
| 2000 | 84° | 62° | 73° | — | — |
| 1999 | 80° | 59° | 70° | — | — |
| 1998 | 80° | 59° | 70° | — | — |
| 1984 | 100° | 62° | 81° | — | — |
| 1983 | 87° | 60° | 74° | — | — |
| 1982 | 86° | 53° | 70° | — | — |
| 1981 | 104° | 60° | 82° | — | — |
| 1980 | 88° | 61° | 74° | — | — |
| 1979coldest | 78° | 53° | 66° | — | — |
| 1978 | 85° | 49° | 67° | — | — |
| 1977 | 87° | 60° | 74° | — | — |
| 1976 | 85° | 53° | 69° | — | — |
| 1975 | 84° | 50° | 67° | — | — |
| 1974 | 88° | 51° | 69° | — | — |
| 1973warmest | 104° | 65° | 84° | — | — |
| 1972 | 92° | 52° | 72° | — | — |
| 1971 | 88° | 51° | 69° | — | — |
42 years of data from ONTARIO INTL AP