Weather on July 4
Ontario, CA
55 Years of Data
Avg High
91°F
Avg Low
60°F
Warmest
2001
87°F avg
Coldest
1979
61°F avg
About This Date
July 4th in Ontario, CA typically brings hot summer weather, with average highs around 91°F and lows near 60°F — a 31°F daily swing. Over 42 years of records, the warmest July 4th was in 2001 (87°F average), while the coldest was 1979 (61°F) — a 26°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
Planning for July 4th in Ontario, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 93° | 60° | 77° | — | — |
| 2024 | 94° | 67° | 80° | — | — |
| 2023 | 91° | 61° | 76° | — | — |
| 2022 | 85° | 59° | 72° | — | — |
| 2021 | 92° | 64° | 78° | — | — |
| 2020 | 94° | 64° | 79° | — | — |
| 2019 | 89° | 66° | 78° | — | — |
| 2018 | 93° | 60° | 77° | — | — |
| 2017 | 98° | 64° | 81° | — | — |
| 2016 | 89° | 58° | 73° | — | — |
| 2015 | 88° | 63° | 75° | — | — |
| 2014 | 96° | 68° | 82° | — | — |
| 2013 | 96° | 66° | 81° | — | — |
| 2012 | 81° | 61° | 71° | — | — |
| 2011 | 95° | 70° | 82° | — | — |
| 2010 | 81° | 57° | 69° | — | — |
| 2009 | 96° | 61° | 78° | — | — |
| 2008 | 101° | 66° | 83° | — | — |
| 2007 | 97° | 67° | 82° | — | — |
| 2006 | 96° | 70° | 83° | — | — |
| 2005 | 90° | 57° | 73° | — | — |
| 2004 | 87° | 60° | 74° | — | — |
| 2003 | 96° | 64° | 80° | — | — |
| 2002 | 84° | 58° | 71° | — | — |
| 2001warmest | 101° | 73° | 87° | — | — |
| 2000 | 83° | 58° | 70° | — | — |
| 1999 | 87° | 58° | 72° | — | — |
| 1998 | 84° | 59° | 72° | — | — |
| 1984 | 98° | 53° | 76° | — | — |
| 1983 | 89° | 55° | 72° | — | — |
| 1982 | 86° | 53° | 70° | — | — |
| 1981 | 103° | 60° | 81° | — | — |
| 1980 | 92° | 58° | 75° | — | — |
| 1979coldest | 73° | 48° | 61° | — | — |
| 1978 | 85° | 53° | 69° | — | — |
| 1977 | 80° | 56° | 68° | — | — |
| 1976 | 90° | 52° | 71° | — | — |
| 1975 | 87° | 51° | 69° | — | — |
| 1974 | 93° | 56° | 74° | — | — |
| 1973 | 98° | 60° | 79° | — | — |
| 1972 | 96° | 57° | 77° | — | — |
| 1971 | 87° | 50° | 69° | — | — |
42 years of data from ONTARIO INTL AP