Weather on September 16
Rancho Cucamonga, CA
55 Years of Data
Avg High
88°F
Avg Low
61°F
Warmest
2014
92°F avg
Coldest
1973
63°F avg
About This Date
September 16th in Rancho Cucamonga, CA typically brings warm fall weather, with average highs around 88°F and lows near 61°F — a 27°F daily swing. Over 41 years of records, the warmest September 16th was in 2014 (92°F average), while the coldest was 1973 (63°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 7% of September 16th dates historically. 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 16th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 100° | 70° | 85° | — | — |
| 2024 | 74° | 57° | 65° | — | — |
| 2023 | 74° | 65° | 69° | — | — |
| 2022 | 85° | 62° | 73° | — | — |
| 2021 | 87° | 59° | 73° | — | — |
| 2020 | 100° | 66° | 83° | — | — |
| 2019 | 90° | 65° | 77° | — | — |
| 2018 | 93° | 63° | 78° | — | — |
| 2017 | 81° | 60° | 70° | — | — |
| 2016 | 87° | 57° | 72° | — | — |
| 2015 | 79° | 65° | 72° | — | — |
| 2014warmest | 107° | 77° | 92° | 0.05" | — |
| 2013 | 101° | 66° | 83° | — | — |
| 2012 | 94° | 67° | 80° | — | — |
| 2011 | 75° | 61° | 68° | — | — |
| 2010 | 89° | 60° | 75° | — | — |
| 2009 | 92° | 62° | 77° | — | — |
| 2008 | 94° | 67° | 80° | — | — |
| 2007 | 85° | 57° | 71° | — | — |
| 2006 | 90° | 57° | 73° | — | — |
| 2005 | 78° | 59° | 69° | — | — |
| 2004 | 87° | 65° | 76° | — | — |
| 2003 | 89° | 58° | 73° | — | — |
| 2002 | 96° | 58° | 77° | 0.08" | — |
| 2001 | 89° | 57° | 73° | — | — |
| 2000 | 107° | 67° | 87° | — | — |
| 1999 | 79° | 56° | 67° | — | — |
| 1998 | 90° | 60° | 75° | — | — |
| 1983 | 94° | 63° | 78° | — | — |
| 1982 | 70° | 61° | 65° | 0.23" | — |
| 1981 | 98° | 62° | 80° | — | — |
| 1980 | 92° | 56° | 74° | — | — |
| 1979 | 100° | 68° | 84° | — | — |
| 1978 | 79° | 54° | 66° | — | — |
| 1977 | 74° | 55° | 64° | — | — |
| 1976 | 74° | 58° | 66° | — | — |
| 1975 | 94° | 66° | 80° | — | — |
| 1974 | 90° | 55° | 72° | — | — |
| 1973coldest | 78° | 48° | 63° | — | — |
| 1972 | 83° | 51° | 67° | — | — |
| 1971 | 80° | 58° | 69° | — | — |
41 years of data from ONTARIO INTL AP