Weather on September 13
Rancho Cucamonga, CA
55 Years of Data
Avg High
89°F
Avg Low
62°F
Warmest
1971
94°F avg
Coldest
2016
64°F avg
About This Date
September 13th in Rancho Cucamonga, CA typically brings warm fall weather, with average highs around 89°F and lows near 62°F — a 27°F daily swing. Over 41 years of records, the warmest September 13th was in 1971 (94°F average), while the coldest was 2016 (64°F) — a 30°F range across recorded history. This date has historically been dry, with little recorded precipitation. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 13th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 62° | 72° | — | — |
| 2024 | 82° | 62° | 72° | — | — |
| 2023 | 84° | 63° | 73° | — | — |
| 2022 | 84° | 69° | 77° | — | — |
| 2021 | 101° | 68° | 84° | — | — |
| 2020 | 97° | 62° | 79° | — | — |
| 2019 | 102° | 67° | 84° | — | — |
| 2018 | 94° | 62° | 78° | — | — |
| 2017 | 84° | 64° | 74° | — | — |
| 2016coldest | 72° | 56° | 64° | — | — |
| 2015 | 95° | 68° | 82° | — | — |
| 2014 | 105° | 71° | 88° | — | — |
| 2013 | 94° | 63° | 78° | — | — |
| 2012 | 102° | 65° | 83° | — | — |
| 2011 | 89° | 65° | 77° | — | — |
| 2010 | 93° | 61° | 77° | — | — |
| 2009 | 82° | 63° | 72° | — | — |
| 2008 | 83° | 62° | 72° | — | — |
| 2007 | 93° | 66° | 80° | — | — |
| 2006 | 88° | 63° | 75° | — | — |
| 2005 | 75° | 56° | 65° | — | — |
| 2004 | 86° | 64° | 75° | — | — |
| 2003 | 90° | 60° | 75° | — | — |
| 2002 | 93° | 64° | 79° | — | — |
| 2001 | 92° | 58° | 75° | — | — |
| 2000 | 98° | 70° | 84° | — | — |
| 1999 | 95° | 62° | 79° | — | — |
| 1998 | 89° | 58° | 73° | — | — |
| 1983 | 97° | 64° | 80° | — | — |
| 1982 | 78° | 58° | 68° | — | — |
| 1981 | 91° | 56° | 73° | — | — |
| 1980 | 83° | 60° | 71° | — | — |
| 1979 | 99° | 68° | 83° | — | — |
| 1978 | 74° | 60° | 67° | — | — |
| 1977 | 81° | 53° | 67° | — | — |
| 1976 | 79° | 57° | 68° | — | — |
| 1975 | 80° | 56° | 68° | — | — |
| 1974 | 84° | 55° | 70° | — | — |
| 1973 | 78° | 54° | 66° | — | — |
| 1972 | 84° | 51° | 68° | — | — |
| 1971warmest | 111° | 77° | 94° | — | — |
41 years of data from ONTARIO INTL AP