Weather on September 28
Rancho Cucamonga, CA
55 Years of Data
Avg High
86°F
Avg Low
59°F
Warmest
2010
86°F avg
Coldest
1971
59°F avg
About This Date
September 28th in Rancho Cucamonga, CA typically brings warm fall weather, with average highs around 86°F and lows near 59°F — a 27°F daily swing. Over 41 years of records, the warmest September 28th was in 2010 (86°F average), while the coldest was 1971 (59°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 28th dates historically. The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
Planning for September 28th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 64° | 72° | — | — |
| 2024 | 89° | 58° | 73° | — | — |
| 2023 | 82° | 59° | 71° | — | — |
| 2022 | 100° | 70° | 85° | — | — |
| 2021 | 75° | 63° | 69° | — | — |
| 2020 | 99° | 64° | 81° | — | — |
| 2019 | 72° | 59° | 65° | — | — |
| 2018 | 91° | 61° | 76° | — | — |
| 2017 | 97° | 58° | 77° | — | — |
| 2016 | 94° | 68° | 81° | — | — |
| 2015 | 93° | 68° | 81° | — | — |
| 2014 | 78° | 59° | 69° | — | — |
| 2013 | 90° | 54° | 72° | — | — |
| 2012 | 94° | 66° | 80° | — | — |
| 2011 | 86° | 60° | 73° | — | — |
| 2010warmest | 98° | 73° | 86° | — | — |
| 2009 | 88° | 60° | 74° | — | — |
| 2008 | 95° | 64° | 80° | — | — |
| 2007 | 69° | 60° | 65° | — | — |
| 2006 | 96° | 61° | 78° | — | — |
| 2005 | 97° | 59° | 78° | — | — |
| 2004 | 79° | 57° | 68° | — | — |
| 2003 | 83° | 59° | 71° | — | — |
| 2002 | 68° | 60° | 64° | — | — |
| 2001 | 94° | 62° | 78° | — | — |
| 2000 | 78° | 63° | 70° | — | — |
| 1999 | 100° | 57° | 79° | — | — |
| 1998 | 77° | 52° | 64° | — | — |
| 1983 | 76° | 56° | 66° | — | — |
| 1982 | 72° | 56° | 64° | 0.1" | — |
| 1981 | 87° | 52° | 69° | — | — |
| 1980 | 90° | 50° | 70° | — | — |
| 1979 | 85° | 58° | 71° | — | — |
| 1978 | 99° | 68° | 83° | — | — |
| 1977 | 80° | 50° | 65° | — | — |
| 1976 | 78° | 52° | 65° | — | — |
| 1975 | 81° | 52° | 66° | — | — |
| 1974 | 79° | 48° | 63° | — | — |
| 1973 | 94° | 58° | 76° | — | — |
| 1972 | 80° | 54° | 67° | — | — |
| 1971coldest | 76° | 43° | 59° | — | — |
41 years of data from ONTARIO INTL AP