Weather on September 25
Rancho Cucamonga, CA
55 Years of Data
Avg High
89°F
Avg Low
61°F
Warmest
2009
87°F avg
Coldest
1971
64°F avg
About This Date
September 25th in Rancho Cucamonga, CA typically brings warm fall weather, with average highs around 89°F and lows near 61°F — a 28°F daily swing. Over 41 years of records, the warmest September 25th was in 2009 (87°F average), while the coldest was 1971 (64°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 25th dates historically. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
Planning for September 25th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 65° | 74° | — | — |
| 2024 | 84° | 60° | 72° | — | — |
| 2023 | 86° | 59° | 73° | — | — |
| 2022 | 96° | 68° | 82° | — | — |
| 2021 | 89° | 65° | 77° | — | — |
| 2020 | 90° | 64° | 77° | — | — |
| 2019 | 91° | 66° | 79° | — | — |
| 2018 | 81° | 60° | 70° | — | — |
| 2017 | 89° | 54° | 71° | — | — |
| 2016 | 99° | 60° | 79° | — | — |
| 2015 | 100° | 70° | 85° | — | — |
| 2014 | 96° | 71° | 84° | — | — |
| 2013 | 81° | 59° | 70° | — | — |
| 2012 | 86° | 61° | 73° | — | — |
| 2011 | 73° | 60° | 67° | — | — |
| 2010 | 105° | 64° | 85° | — | — |
| 2009warmest | 105° | 68° | 87° | — | — |
| 2008 | 101° | 69° | 85° | — | — |
| 2007 | 90° | 59° | 74° | — | — |
| 2006 | 94° | 60° | 77° | — | — |
| 2005 | 86° | 52° | 69° | — | — |
| 2004 | 97° | 60° | 78° | — | — |
| 2003 | 88° | 59° | 73° | — | — |
| 2002 | 93° | 68° | 81° | — | — |
| 2001 | 99° | 65° | 82° | — | — |
| 2000 | 93° | 58° | 75° | — | — |
| 1999 | 86° | 58° | 72° | — | — |
| 1998 | 74° | 55° | 64° | — | — |
| 1983 | 89° | 54° | 71° | — | — |
| 1982 | 91° | 70° | 80° | — | — |
| 1981 | 78° | 54° | 66° | — | — |
| 1980 | 94° | 54° | 74° | — | — |
| 1979 | 90° | 60° | 75° | — | — |
| 1978 | 103° | 69° | 86° | — | — |
| 1977 | 83° | 52° | 67° | — | — |
| 1976 | 68° | 59° | 64° | 0.1" | — |
| 1975 | 96° | 62° | 79° | — | — |
| 1974 | 80° | 60° | 70° | — | — |
| 1973 | 83° | 49° | 66° | — | — |
| 1972 | 75° | 57° | 66° | — | — |
| 1971coldest | 81° | 48° | 64° | — | — |
41 years of data from ONTARIO INTL AP