Weather on August 9
Rancho Cucamonga, CA
55 Years of Data
Avg High
94°F
Avg Low
64°F
Warmest
2012
89°F avg
Coldest
1974
70°F avg
About This Date
August 9th in Rancho Cucamonga, CA typically brings hot summer weather, with average highs around 94°F and lows near 64°F — a 30°F daily swing. Over 42 years of records, the warmest August 9th was in 2012 (89°F average), while the coldest was 1974 (70°F) — a 19°F range across recorded history. This date has historically been dry, with little recorded precipitation. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for August 9th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 95° | 65° | 80° | — | — |
| 2024 | 97° | 65° | 81° | — | — |
| 2023 | 90° | 67° | 78° | — | — |
| 2022 | 99° | 74° | 86° | — | — |
| 2021 | 97° | 65° | 81° | — | — |
| 2020 | 94° | 64° | 79° | — | — |
| 2019 | 93° | 64° | 79° | — | — |
| 2018 | 103° | 71° | 87° | — | — |
| 2017 | 95° | 65° | 80° | — | — |
| 2016 | 90° | 64° | 77° | — | — |
| 2015 | 86° | 60° | 73° | — | — |
| 2014 | 92° | 63° | 77° | — | — |
| 2013 | 86° | 58° | 72° | — | — |
| 2012warmest | 104° | 74° | 89° | — | — |
| 2011 | 87° | 58° | 72° | — | — |
| 2010 | 86° | 56° | 71° | — | — |
| 2009 | 89° | 62° | 76° | — | — |
| 2008 | 91° | 66° | 79° | — | — |
| 2007 | 91° | 62° | 77° | — | — |
| 2006 | 101° | 66° | 83° | — | — |
| 2005 | 95° | 66° | 81° | — | — |
| 2004 | 100° | 67° | 83° | — | — |
| 2003 | 102° | 69° | 86° | — | — |
| 2002 | 103° | 66° | 84° | — | — |
| 2001 | 93° | 62° | 78° | — | — |
| 2000 | 95° | 65° | 80° | — | — |
| 1999 | 84° | 57° | 71° | — | — |
| 1998 | 101° | 66° | 83° | — | — |
| 1984 | 99° | 60° | 79° | — | — |
| 1983 | 90° | 71° | 80° | — | — |
| 1982 | 99° | 61° | 80° | — | — |
| 1981 | 99° | 63° | 81° | — | — |
| 1980 | 104° | 64° | 84° | — | — |
| 1979 | 96° | 62° | 79° | — | — |
| 1978 | 93° | 65° | 79° | — | — |
| 1977 | 90° | 52° | 71° | — | — |
| 1976 | 89° | 52° | 70° | — | — |
| 1975 | 91° | 63° | 77° | — | — |
| 1974coldest | 80° | 60° | 70° | — | — |
| 1973 | 90° | 57° | 73° | — | — |
| 1972 | 88° | 62° | 75° | — | — |
| 1971 | 102° | 69° | 86° | — | — |
42 years of data from ONTARIO INTL AP