Weather on October 31
Rancho Cucamonga, CA
55 Years of Data
Avg High
76°F
Avg Low
50°F
Warmest
1981
75°F avg
Coldest
1971
49°F avg
About This Date
October 31st in Rancho Cucamonga, CA typically brings pleasant fall weather, with average highs around 76°F and lows near 50°F — a 26°F daily swing. Over 40 years of records, the warmest October 31st was in 1981 (75°F average), while the coldest was 1971 (49°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 10% of October 31st dates historically. The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
Planning for October 31st in Rancho Cucamonga, CA? Great weather for outdoor activities.
Warming Trend
1.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 58° | 70° | — | — |
| 2024 | 73° | 50° | 62° | — | — |
| 2023 | 86° | 50° | 68° | — | — |
| 2022 | 83° | 50° | 66° | — | — |
| 2021 | 72° | 59° | 65° | — | — |
| 2020 | 91° | 52° | 71° | — | — |
| 2019 | 78° | 41° | 60° | — | — |
| 2018 | 82° | 57° | 70° | — | — |
| 2017 | 70° | 58° | 64° | — | — |
| 2016 | 69° | 53° | 61° | — | — |
| 2015 | 91° | 58° | 74° | — | — |
| 2014 | 73° | 57° | 65° | 0.46" | — |
| 2013 | 81° | 47° | 64° | — | — |
| 2012 | 77° | 51° | 64° | — | — |
| 2011 | 85° | 52° | 68° | — | — |
| 2010 | 70° | 49° | 59° | 0.13" | — |
| 2009 | 85° | 49° | 67° | — | — |
| 2008 | 85° | 65° | 75° | — | — |
| 2007 | 81° | 53° | 67° | — | — |
| 2006 | 68° | 52° | 60° | — | — |
| 2005 | 88° | 50° | 69° | — | — |
| 2004 | 71° | 45° | 58° | — | — |
| 2003 | 61° | 49° | 55° | 0.03" | — |
| 2002 | 65° | 50° | 57° | — | — |
| 2001 | 71° | 56° | 63° | — | — |
| 2000 | 76° | 45° | 60° | — | — |
| 1999 | 91° | 47° | 69° | — | — |
| 1998 | 75° | 45° | 60° | — | — |
| 1983 | 74° | 58° | 66° | — | — |
| 1981warmest | 83° | 67° | 75° | — | — |
| 1980 | 85° | 49° | 67° | — | — |
| 1979 | 68° | 42° | 55° | — | — |
| 1978 | 71° | 48° | 60° | — | — |
| 1977 | 71° | 43° | 57° | — | — |
| 1976 | 82° | 48° | 65° | — | — |
| 1975 | 65° | 41° | 53° | 0.3" | — |
| 1974 | 61° | 43° | 52° | — | — |
| 1973 | 85° | 50° | 67° | — | — |
| 1972 | 65° | 38° | 51° | — | — |
| 1971coldest | 63° | 35° | 49° | — | — |
40 years of data from ONTARIO INTL AP