Weather on October 4
Rancho Cucamonga, CA
55 Years of Data
Avg High
83°F
Avg Low
57°F
Warmest
2014
83°F avg
Coldest
2009
60°F avg
About This Date
October 4th in Rancho Cucamonga, CA typically brings warm fall weather, with average highs around 83°F and lows near 57°F — a 26°F daily swing. Over 41 years of records, the warmest October 4th was in 2014 (83°F average), while the coldest was 2009 (60°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 5% of October 4th dates historically. The last decade has been 5.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.1°F warmer on this date compared to 20-30 years ago.
Planning for October 4th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 57° | 68° | — | — |
| 2024 | 95° | 64° | 80° | — | — |
| 2023 | 94° | 60° | 77° | — | — |
| 2022 | 89° | 63° | 76° | — | — |
| 2021 | 97° | 67° | 82° | — | — |
| 2020 | 99° | 65° | 82° | — | — |
| 2019 | 82° | 55° | 69° | — | — |
| 2018 | 79° | 63° | 71° | — | — |
| 2017 | 85° | 55° | 70° | — | — |
| 2016 | 79° | 56° | 67° | — | — |
| 2015 | 69° | 60° | 65° | 0.3" | — |
| 2014warmest | 102° | 64° | 83° | — | — |
| 2013 | 87° | 56° | 71° | — | — |
| 2012 | 85° | 60° | 72° | — | — |
| 2011 | 71° | 58° | 64° | — | — |
| 2010 | 68° | 57° | 63° | — | — |
| 2009coldest | 68° | 51° | 60° | — | — |
| 2008 | 68° | 61° | 64° | — | — |
| 2007 | 81° | 57° | 69° | — | — |
| 2006 | 81° | 57° | 69° | — | — |
| 2005 | 84° | 53° | 69° | — | — |
| 2004 | 82° | 58° | 70° | — | — |
| 2003 | 80° | 55° | 68° | — | — |
| 2002 | 82° | 53° | 68° | — | — |
| 2001 | 96° | 60° | 78° | — | — |
| 2000 | 68° | 60° | 64° | — | — |
| 1999 | 88° | 54° | 71° | — | — |
| 1998 | 76° | 54° | 65° | — | — |
| 1983 | 80° | 54° | 67° | 0.36" | — |
| 1982 | 81° | 52° | 66° | — | — |
| 1981 | 75° | 55° | 65° | — | — |
| 1980 | 93° | 56° | 74° | — | — |
| 1979 | 90° | 64° | 77° | — | — |
| 1978 | 86° | 55° | 71° | — | — |
| 1977 | 90° | 57° | 73° | — | — |
| 1976 | 82° | 50° | 66° | — | — |
| 1975 | 95° | 62° | 79° | — | — |
| 1974 | 70° | 52° | 61° | — | — |
| 1973 | 87° | 48° | 68° | — | — |
| 1972 | 76° | 50° | 63° | — | — |
| 1971 | 92° | 55° | 73° | — | — |
41 years of data from ONTARIO INTL AP