Weather on September 9
Rancho Cucamonga, CA
55 Years of Data
Avg High
90°F
Avg Low
64°F
Warmest
2024
93°F avg
Coldest
2005
65°F avg
About This Date
September 9th in Rancho Cucamonga, CA typically brings hot fall weather, with average highs around 90°F and lows near 64°F — a 26°F daily swing. Over 41 years of records, the warmest September 9th was in 2024 (93°F average), while the coldest was 2005 (65°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 7% of September 9th dates historically, with the wettest September 9th recording 1.19" of rain. The last decade has been 7.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 7.8°F warmer on this date compared to 20-30 years ago.
Planning for September 9th 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 | 86° | 63° | 74° | — | — |
| 2024warmest | 108° | 78° | 93° | — | — |
| 2023 | 98° | 72° | 85° | — | — |
| 2022 | 96° | 72° | 84° | 0.3" | — |
| 2021 | 99° | 74° | 86° | — | — |
| 2020 | 92° | 67° | 79° | — | — |
| 2019 | 85° | 63° | 74° | — | — |
| 2018 | 100° | 66° | 83° | — | — |
| 2017 | 91° | 64° | 78° | — | — |
| 2016 | 92° | 61° | 76° | — | — |
| 2015 | 105° | 79° | 92° | 1.19" | — |
| 2014 | 93° | 69° | 81° | — | — |
| 2013 | 90° | 68° | 79° | — | — |
| 2012 | 102° | 71° | 87° | — | — |
| 2011 | 90° | 62° | 76° | — | — |
| 2010 | 76° | 56° | 66° | — | — |
| 2009 | 93° | 61° | 77° | — | — |
| 2008 | 92° | 62° | 77° | — | — |
| 2007 | 85° | 60° | 72° | — | — |
| 2006 | 86° | 61° | 73° | — | — |
| 2005coldest | 73° | 58° | 65° | — | — |
| 2004 | 96° | 69° | 83° | — | — |
| 2003 | 80° | 61° | 70° | — | — |
| 2002 | 92° | 62° | 77° | — | — |
| 2001 | 81° | 58° | 69° | — | — |
| 2000 | 90° | 55° | 72° | — | — |
| 1999 | 92° | 62° | 77° | — | — |
| 1998 | 85° | 64° | 74° | — | — |
| 1983 | 96° | 66° | 81° | — | — |
| 1982 | 90° | 64° | 77° | 0.1" | — |
| 1981 | 95° | 62° | 79° | — | — |
| 1980 | 80° | 51° | 66° | — | — |
| 1979 | 109° | 70° | 89° | — | — |
| 1978 | 80° | 52° | 66° | — | — |
| 1977 | 92° | 62° | 77° | — | — |
| 1976 | 90° | 66° | 78° | — | — |
| 1975 | 76° | 60° | 68° | — | — |
| 1974 | 94° | 60° | 77° | — | — |
| 1973 | 79° | 56° | 67° | — | — |
| 1972 | 75° | 63° | 69° | — | — |
| 1971 | 97° | 67° | 82° | — | — |
41 years of data from ONTARIO INTL AP