Weather on September 26
Rancho Cucamonga, CA
55 Years of Data
Avg High
88°F
Avg Low
60°F
Warmest
1978
86°F avg
Coldest
1971
61°F avg
About This Date
September 26th in Rancho Cucamonga, CA typically brings warm fall weather, with average highs around 88°F and lows near 60°F — a 28°F daily swing. Over 41 years of records, the warmest September 26th was in 1978 (86°F average), while the coldest was 1971 (61°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 5% of September 26th dates historically, with the wettest September 26th recording 0.89" of rain. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for September 26th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 64° | 70° | — | — |
| 2024 | 86° | 58° | 72° | — | — |
| 2023 | 88° | 60° | 74° | — | — |
| 2022 | 99° | 70° | 84° | — | — |
| 2021 | 79° | 63° | 71° | — | — |
| 2020 | 89° | 61° | 75° | — | — |
| 2019 | 78° | 67° | 72° | — | — |
| 2018 | 94° | 60° | 77° | — | — |
| 2017 | 90° | 56° | 73° | — | — |
| 2016 | 103° | 65° | 84° | — | — |
| 2015 | 99° | 71° | 85° | — | — |
| 2014 | 88° | 63° | 75° | — | — |
| 2013 | 75° | 59° | 67° | — | — |
| 2012 | 87° | 60° | 74° | — | — |
| 2011 | 94° | 57° | 75° | — | — |
| 2010 | 107° | 65° | 86° | — | — |
| 2009 | 106° | 67° | 86° | — | — |
| 2008 | 97° | 65° | 81° | — | — |
| 2007 | 95° | 60° | 78° | — | — |
| 2006 | 87° | 59° | 73° | — | — |
| 2005 | 92° | 54° | 73° | — | — |
| 2004 | 96° | 61° | 78° | — | — |
| 2003 | 89° | 60° | 75° | — | — |
| 2002 | 85° | 61° | 73° | — | — |
| 2001 | 99° | 65° | 82° | — | — |
| 2000 | 87° | 60° | 74° | — | — |
| 1999 | 84° | 56° | 70° | — | — |
| 1998 | 71° | 55° | 63° | — | — |
| 1983 | 80° | 61° | 70° | — | — |
| 1982 | 78° | 65° | 71° | 0.89" | — |
| 1981 | 86° | 51° | 69° | — | — |
| 1980 | 93° | 55° | 74° | — | — |
| 1979 | 91° | 59° | 75° | — | — |
| 1978warmest | 103° | 70° | 86° | — | — |
| 1977 | 74° | 56° | 65° | — | — |
| 1976 | 68° | 58° | 63° | 0.05" | — |
| 1975 | 91° | 61° | 76° | — | — |
| 1974 | 75° | 57° | 66° | — | — |
| 1973 | 92° | 56° | 74° | — | — |
| 1972 | 79° | 51° | 65° | — | — |
| 1971coldest | 74° | 49° | 61° | — | — |
41 years of data from ONTARIO INTL AP