Weather on June 20
Ontario, CA
55 Years of Data
Avg High
89°F
Avg Low
59°F
Warmest
2016
93°F avg
Coldest
2003
60°F avg
About This Date
June 20th in Ontario, CA typically brings warm summer weather, with average highs around 89°F and lows near 59°F — a 30°F daily swing. Over 42 years of records, the warmest June 20th was in 2016 (93°F average), while the coldest was 2003 (60°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 2% of June 20th dates historically. The last decade has been 6.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.3°F warmer on this date compared to 20-30 years ago.
Planning for June 20th in Ontario, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 62° | 73° | — | — |
| 2024 | 86° | 59° | 73° | — | — |
| 2023 | 82° | 60° | 71° | — | — |
| 2022 | 100° | 59° | 80° | — | — |
| 2021 | 92° | 65° | 78° | — | — |
| 2020 | 82° | 61° | 71° | — | — |
| 2019 | 82° | 65° | 73° | — | — |
| 2018 | 90° | 60° | 75° | — | — |
| 2017 | 103° | 69° | 86° | — | — |
| 2016warmest | 112° | 74° | 93° | — | — |
| 2015 | 97° | 66° | 81° | — | — |
| 2014 | 94° | 62° | 78° | — | — |
| 2013 | 87° | 60° | 74° | — | — |
| 2012 | 88° | 58° | 73° | — | — |
| 2011 | 91° | 56° | 73° | — | — |
| 2010 | 84° | 55° | 70° | — | — |
| 2009 | 75° | 61° | 68° | — | — |
| 2008 | 108° | 70° | 89° | — | — |
| 2007 | 94° | 59° | 76° | — | — |
| 2006 | 91° | 60° | 76° | — | — |
| 2005 | 93° | 55° | 74° | — | — |
| 2004 | 82° | 56° | 69° | — | — |
| 2003coldest | 63° | 58° | 60° | — | — |
| 2002 | 82° | 63° | 72° | — | — |
| 2001 | 93° | 64° | 79° | — | — |
| 2000 | 90° | 58° | 74° | — | — |
| 1999 | 86° | 56° | 71° | — | — |
| 1998 | 81° | 58° | 69° | — | — |
| 1984 | 90° | 54° | 72° | — | — |
| 1983 | 82° | 57° | 70° | — | — |
| 1982 | 77° | 55° | 66° | — | — |
| 1981 | 96° | 66° | 81° | — | — |
| 1980 | 89° | 50° | 70° | — | — |
| 1979 | 86° | 51° | 69° | — | — |
| 1978 | 94° | 59° | 76° | — | — |
| 1977 | 76° | 52° | 64° | — | — |
| 1976 | 90° | 56° | 73° | — | — |
| 1975 | 72° | 51° | 61° | 0.2" | — |
| 1974 | 89° | 50° | 70° | — | — |
| 1973 | 106° | 61° | 83° | — | — |
| 1972 | 83° | 58° | 70° | — | — |
| 1971 | 99° | 58° | 78° | — | — |
42 years of data from ONTARIO INTL AP