Weather on June 15
Rancho Cucamonga, CA
55 Years of Data
Avg High
88°F
Avg Low
59°F
Warmest
2021
87°F avg
Coldest
1973
61°F avg
About This Date
June 15th in Rancho Cucamonga, CA typically brings warm summer weather, with average highs around 88°F and lows near 59°F — a 29°F daily swing. Over 42 years of records, the warmest June 15th was in 2021 (87°F average), while the coldest was 1973 (61°F) — a 26°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for June 15th in Rancho Cucamonga, 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 | 100° | 63° | 81° | — | — |
| 2024 | 93° | 63° | 78° | — | — |
| 2023 | 73° | 59° | 66° | — | — |
| 2022 | 95° | 62° | 79° | — | — |
| 2021warmest | 105° | 70° | 87° | — | — |
| 2020 | 87° | 63° | 75° | — | — |
| 2019 | 86° | 65° | 75° | — | — |
| 2018 | 91° | 62° | 77° | — | — |
| 2017 | 95° | 63° | 79° | — | — |
| 2016 | 78° | 58° | 68° | — | — |
| 2015 | 95° | 60° | 78° | — | — |
| 2014 | 84° | 61° | 72° | — | — |
| 2013 | 84° | 59° | 72° | — | — |
| 2012 | 79° | 60° | 69° | — | — |
| 2011 | 86° | 58° | 72° | — | — |
| 2010 | 88° | 59° | 73° | — | — |
| 2009 | 74° | 56° | 65° | — | — |
| 2008 | 94° | 63° | 78° | — | — |
| 2007 | 91° | 61° | 76° | — | — |
| 2006 | 85° | 61° | 73° | — | — |
| 2005 | 82° | 62° | 72° | — | — |
| 2004 | 85° | 60° | 72° | — | — |
| 2003 | 89° | 59° | 74° | — | — |
| 2002 | 94° | 60° | 77° | — | — |
| 2001 | 97° | 62° | 79° | — | — |
| 2000 | 92° | 61° | 76° | — | — |
| 1999 | 93° | 60° | 77° | — | — |
| 1998 | 83° | 57° | 70° | — | — |
| 1984 | 80° | 54° | 67° | — | — |
| 1983 | 88° | 54° | 71° | — | — |
| 1982 | 82° | 54° | 68° | — | — |
| 1981 | 96° | 68° | 82° | — | — |
| 1980 | 94° | 52° | 73° | — | — |
| 1979 | 88° | 51° | 69° | — | — |
| 1978 | 86° | 51° | 69° | — | — |
| 1977 | 85° | 49° | 67° | — | — |
| 1976 | 98° | 56° | 77° | — | — |
| 1975 | 80° | 49° | 64° | — | — |
| 1974 | 94° | 57° | 75° | — | — |
| 1973coldest | 74° | 48° | 61° | — | — |
| 1972 | 87° | 52° | 69° | — | — |
| 1971 | 97° | 57° | 77° | — | — |
42 years of data from ONTARIO INTL AP