Weather on September 11
Rancho Cucamonga, CA
55 Years of Data
Avg High
90°F
Avg Low
63°F
Warmest
1971
88°F avg
Coldest
1975
63°F avg
About This Date
September 11th in Rancho Cucamonga, CA typically brings hot fall weather, with average highs around 90°F and lows near 63°F — a 27°F daily swing. Over 41 years of records, the warmest September 11th was in 1971 (88°F average), while the coldest was 1975 (63°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 10% of September 11th dates historically, with the wettest September 11th recording 3.33" of rain. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
Planning for September 11th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 62° | 71° | — | — |
| 2024 | 86° | 61° | 73° | — | — |
| 2023 | 94° | 72° | 83° | — | — |
| 2022 | 92° | 71° | 81° | 0.36" | — |
| 2021 | 101° | 72° | 86° | — | — |
| 2020 | 96° | 65° | 80° | — | — |
| 2019 | 86° | 62° | 74° | — | — |
| 2018 | 89° | 62° | 76° | — | — |
| 2017 | 101° | 70° | 85° | 0.05" | — |
| 2016 | 92° | 61° | 76° | — | — |
| 2015 | 100° | 76° | 88° | — | — |
| 2014 | 100° | 71° | 86° | — | — |
| 2013 | 87° | 60° | 74° | — | — |
| 2012 | 86° | 71° | 79° | — | — |
| 2011 | 84° | 61° | 72° | — | — |
| 2010 | 90° | 58° | 74° | — | — |
| 2009 | 94° | 70° | 82° | — | — |
| 2008 | 82° | 61° | 71° | 0.03" | — |
| 2007 | 95° | 65° | 80° | — | — |
| 2006 | 95° | 62° | 79° | — | — |
| 2005 | 79° | 58° | 68° | — | — |
| 2004 | 98° | 72° | 85° | — | — |
| 2003 | 94° | 62° | 78° | — | — |
| 2002 | 92° | 64° | 78° | — | — |
| 2001 | 85° | 59° | 72° | — | — |
| 2000 | 100° | 59° | 80° | — | — |
| 1999 | 88° | 57° | 72° | — | — |
| 1998 | 87° | 61° | 74° | — | — |
| 1983 | 107° | 68° | 88° | — | — |
| 1982 | 82° | 62° | 72° | — | — |
| 1981 | 94° | 56° | 75° | — | — |
| 1980 | 85° | 54° | 69° | — | — |
| 1979 | 102° | 66° | 84° | — | — |
| 1978 | 80° | 59° | 70° | — | — |
| 1977 | 85° | 59° | 72° | — | — |
| 1976 | 68° | 59° | 64° | 3.33" | — |
| 1975coldest | 73° | 53° | 63° | — | — |
| 1974 | 94° | 56° | 75° | — | — |
| 1973 | 80° | 58° | 69° | — | — |
| 1972 | 77° | 58° | 67° | — | — |
| 1971warmest | 107° | 69° | 88° | — | — |
41 years of data from ONTARIO INTL AP