Weather on August 12
Rancho Cucamonga, CA
55 Years of Data
Avg High
93°F
Avg Low
64°F
Warmest
2012
90°F avg
Coldest
1975
69°F avg
About This Date
August 12th in Rancho Cucamonga, CA typically brings hot summer weather, with average highs around 93°F and lows near 64°F — a 29°F daily swing. Over 41 years of records, the warmest August 12th was in 2012 (90°F average), while the coldest was 1975 (69°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 12th dates historically. The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for August 12th in Rancho Cucamonga, 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 | 92° | 65° | 78° | — | — |
| 2024 | 95° | 72° | 83° | — | — |
| 2023 | 89° | 65° | 77° | — | — |
| 2022 | 101° | 70° | 85° | — | — |
| 2021 | 99° | 72° | 85° | — | — |
| 2020 | 101° | 65° | 83° | — | — |
| 2019 | 92° | 63° | 77° | — | — |
| 2018 | 94° | 72° | 83° | — | — |
| 2017 | 97° | 66° | 81° | — | — |
| 2016 | 93° | 64° | 79° | — | — |
| 2015 | 100° | 63° | 81° | — | — |
| 2014 | 94° | 68° | 81° | — | — |
| 2013 | 91° | 60° | 76° | — | — |
| 2012warmest | 105° | 76° | 90° | — | — |
| 2011 | 86° | 62° | 74° | — | — |
| 2010 | 88° | 57° | 72° | — | — |
| 2009 | 93° | 63° | 78° | — | — |
| 2008 | 93° | 61° | 77° | — | — |
| 2007 | 97° | 65° | 81° | — | — |
| 2006 | 92° | 64° | 78° | — | — |
| 2005 | 86° | 62° | 74° | — | — |
| 2004 | 90° | 63° | 76° | — | — |
| 2003 | 103° | 70° | 86° | — | — |
| 2002 | 96° | 66° | 81° | — | — |
| 2001 | 91° | 63° | 77° | — | — |
| 2000 | 101° | 65° | 83° | — | — |
| 1999 | 91° | 59° | 75° | — | — |
| 1998 | 101° | 70° | 85° | — | — |
| 1983 | 98° | 62° | 80° | — | — |
| 1982 | 86° | 59° | 73° | — | — |
| 1981 | 90° | 62° | 76° | — | — |
| 1980 | 101° | 70° | 85° | — | — |
| 1979 | 80° | 61° | 70° | — | — |
| 1978 | 89° | 56° | 72° | — | — |
| 1977 | 93° | 61° | 77° | — | — |
| 1976 | 92° | 54° | 73° | — | — |
| 1975coldest | 86° | 51° | 69° | — | — |
| 1974 | 82° | 59° | 71° | — | — |
| 1973 | 92° | 60° | 76° | — | — |
| 1972 | 84° | 66° | 75° | 0.28" | — |
| 1971 | 93° | 62° | 78° | — | — |
41 years of data from ONTARIO INTL AP