Weather on October 3
Rancho Cucamonga, CA
55 Years of Data
Avg High
84°F
Avg Low
58°F
Warmest
2020
84°F avg
Coldest
1973
60°F avg
About This Date
October 3rd in Rancho Cucamonga, CA typically brings warm fall weather, with average highs around 84°F and lows near 58°F — a 26°F daily swing. Over 41 years of records, the warmest October 3rd was in 2020 (84°F average), while the coldest was 1973 (60°F) — a 24°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 6.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.1°F warmer on this date compared to 20-30 years ago.
Planning for October 3rd 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 | 77° | 60° | 69° | — | — |
| 2024 | 97° | 67° | 82° | — | — |
| 2023 | 85° | 55° | 70° | — | — |
| 2022 | 87° | 62° | 75° | — | — |
| 2021 | 99° | 64° | 81° | — | — |
| 2020warmest | 101° | 67° | 84° | — | — |
| 2019 | 84° | 56° | 70° | — | — |
| 2018 | 79° | 65° | 72° | — | — |
| 2017 | 76° | 58° | 67° | — | — |
| 2016 | 77° | 58° | 67° | — | — |
| 2015 | 85° | 61° | 73° | — | — |
| 2014 | 99° | 60° | 79° | — | — |
| 2013 | 76° | 61° | 68° | — | — |
| 2012 | 93° | 65° | 79° | — | — |
| 2011 | 83° | 59° | 71° | — | — |
| 2010 | 86° | 63° | 74° | — | — |
| 2009 | 81° | 55° | 68° | — | — |
| 2008 | 80° | 60° | 70° | — | — |
| 2007 | 90° | 62° | 76° | — | — |
| 2006 | 83° | 59° | 71° | — | — |
| 2005 | 81° | 55° | 68° | — | — |
| 2004 | 84° | 55° | 70° | — | — |
| 2003 | 70° | 58° | 64° | — | — |
| 2002 | 79° | 50° | 64° | — | — |
| 2001 | 85° | 62° | 73° | — | — |
| 2000 | 78° | 59° | 69° | — | — |
| 1999 | 85° | 52° | 68° | — | — |
| 1998 | 73° | 58° | 65° | — | — |
| 1983 | 84° | 51° | 68° | — | — |
| 1982 | 86° | 50° | 68° | — | — |
| 1981 | 69° | 58° | 63° | — | — |
| 1980 | 98° | 55° | 77° | — | — |
| 1979 | 91° | 62° | 77° | — | — |
| 1978 | 89° | 55° | 72° | — | — |
| 1977 | 88° | 52° | 70° | — | — |
| 1976 | 75° | 50° | 63° | — | — |
| 1975 | 95° | 60° | 78° | — | — |
| 1974 | 74° | 53° | 63° | — | — |
| 1973coldest | 74° | 47° | 60° | — | — |
| 1972 | 75° | 52° | 63° | — | — |
| 1971 | 87° | 48° | 68° | — | — |
41 years of data from ONTARIO INTL AP