Weather on September 27
Rancho Cucamonga, CA
55 Years of Data
Avg High
87°F
Avg Low
60°F
Warmest
2010
91°F avg
Coldest
1971
60°F avg
About This Date
September 27th in Rancho Cucamonga, CA typically brings warm fall weather, with average highs around 87°F and lows near 60°F — a 27°F daily swing. Over 41 years of records, the warmest September 27th was in 2010 (91°F average), while the coldest was 1971 (60°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 5% of September 27th dates historically. The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
Planning for September 27th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 64° | 71° | 0.08" | — |
| 2024 | 85° | 59° | 72° | — | — |
| 2023 | 90° | 60° | 75° | — | — |
| 2022 | 102° | 69° | 86° | — | — |
| 2021 | 73° | 64° | 69° | — | — |
| 2020 | 92° | 63° | 77° | — | — |
| 2019 | 72° | 64° | 68° | — | — |
| 2018 | 101° | 64° | 82° | — | — |
| 2017 | 91° | 57° | 74° | — | — |
| 2016 | 97° | 70° | 83° | — | — |
| 2015 | 97° | 67° | 82° | — | — |
| 2014 | 78° | 59° | 69° | — | — |
| 2013 | 85° | 51° | 68° | — | — |
| 2012 | 93° | 62° | 78° | — | — |
| 2011 | 99° | 59° | 79° | — | — |
| 2010warmest | 112° | 71° | 91° | — | — |
| 2009 | 97° | 65° | 81° | — | — |
| 2008 | 95° | 65° | 80° | — | — |
| 2007 | 89° | 60° | 75° | — | — |
| 2006 | 92° | 59° | 75° | — | — |
| 2005 | 88° | 62° | 75° | — | — |
| 2004 | 92° | 59° | 75° | — | — |
| 2003 | 91° | 56° | 73° | — | — |
| 2002 | 77° | 57° | 67° | — | — |
| 2001 | 99° | 65° | 82° | — | — |
| 2000 | 76° | 61° | 68° | — | — |
| 1999 | 80° | 59° | 70° | — | — |
| 1998 | 73° | 58° | 65° | — | — |
| 1983 | 80° | 60° | 70° | — | — |
| 1982 | 70° | 57° | 63° | 0.36" | — |
| 1981 | 87° | 53° | 70° | — | — |
| 1980 | 91° | 56° | 73° | — | — |
| 1979 | 88° | 57° | 72° | — | — |
| 1978 | 100° | 68° | 84° | — | — |
| 1977 | 76° | 56° | 66° | — | — |
| 1976 | 77° | 54° | 65° | — | — |
| 1975 | 85° | 54° | 69° | — | — |
| 1974 | 71° | 56° | 63° | — | — |
| 1973 | 94° | 59° | 76° | — | — |
| 1972 | 78° | 50° | 64° | — | — |
| 1971coldest | 72° | 49° | 60° | — | — |
41 years of data from ONTARIO INTL AP