Weather on June 28
Ontario, CA
55 Years of Data
Avg High
91°F
Avg Low
61°F
Warmest
2006
88°F avg
Coldest
1978
65°F avg
About This Date
June 28th in Ontario, CA typically brings hot summer weather, with average highs around 91°F and lows near 61°F — a 30°F daily swing. Over 42 years of records, the warmest June 28th was in 2006 (88°F average), while the coldest was 1978 (65°F) — a 23°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
Planning for June 28th in Ontario, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 61° | 79° | — | — |
| 2024 | 90° | 62° | 76° | — | — |
| 2023 | 81° | 57° | 69° | — | — |
| 2022 | 99° | 70° | 84° | — | — |
| 2021 | 100° | 68° | 84° | — | — |
| 2020 | 78° | 63° | 70° | — | — |
| 2019 | 93° | 60° | 77° | — | — |
| 2018 | 88° | 60° | 74° | — | — |
| 2017 | 92° | 62° | 77° | — | — |
| 2016 | 99° | 70° | 84° | — | — |
| 2015 | 103° | 70° | 86° | — | — |
| 2014 | 90° | 63° | 76° | — | — |
| 2013 | 101° | 71° | 86° | — | — |
| 2012 | 94° | 61° | 77° | — | — |
| 2011 | 88° | 61° | 74° | — | — |
| 2010 | 81° | 59° | 70° | — | — |
| 2009 | 100° | 65° | 82° | — | — |
| 2008 | 91° | 60° | 76° | — | — |
| 2007 | 93° | 63° | 78° | — | — |
| 2006warmest | 102° | 73° | 88° | — | — |
| 2005 | 82° | 56° | 69° | — | — |
| 2004 | 81° | 61° | 71° | — | — |
| 2003 | 89° | 59° | 74° | — | — |
| 2002 | 87° | 57° | 72° | — | — |
| 2001 | 91° | 60° | 76° | — | — |
| 2000 | 95° | 64° | 80° | — | — |
| 1999 | 89° | 57° | 73° | — | — |
| 1998 | 90° | 60° | 75° | — | — |
| 1984 | 101° | 60° | 80° | — | — |
| 1983 | 79° | 58° | 68° | — | — |
| 1982 | 85° | 56° | 70° | — | — |
| 1981 | 91° | 59° | 75° | — | — |
| 1980 | 100° | 66° | 83° | — | — |
| 1979 | 103° | 64° | 83° | — | — |
| 1978coldest | 80° | 50° | 65° | — | — |
| 1977 | 91° | 57° | 74° | — | — |
| 1976 | 102° | 66° | 84° | — | — |
| 1975 | 85° | 51° | 68° | — | — |
| 1974 | 101° | 62° | 81° | — | — |
| 1973 | 87° | 56° | 71° | — | — |
| 1972 | 92° | 53° | 72° | — | — |
| 1971 | 78° | 57° | 68° | — | — |
42 years of data from ONTARIO INTL AP