Weather on September 29
Rancho Cucamonga, CA
55 Years of Data
Avg High
86°F
Avg Low
59°F
Warmest
2020
85°F avg
Coldest
1971
60°F avg
About This Date
September 29th in Rancho Cucamonga, CA typically brings warm fall weather, with average highs around 86°F and lows near 59°F — a 27°F daily swing. Over 41 years of records, the warmest September 29th was in 2020 (85°F average), while the coldest was 1971 (60°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 29th dates historically. The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
Planning for September 29th 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 | 84° | 62° | 73° | — | — |
| 2024 | 90° | 57° | 73° | — | — |
| 2023 | 75° | 62° | 69° | — | — |
| 2022 | 92° | 67° | 79° | — | — |
| 2021 | 81° | 61° | 71° | — | — |
| 2020warmest | 104° | 67° | 85° | — | — |
| 2019 | 73° | 56° | 64° | — | — |
| 2018 | 88° | 62° | 75° | — | — |
| 2017 | 96° | 61° | 78° | — | — |
| 2016 | 96° | 68° | 82° | — | — |
| 2015 | 92° | 64° | 78° | — | — |
| 2014 | 84° | 59° | 72° | — | — |
| 2013 | 90° | 56° | 73° | — | — |
| 2012 | 95° | 65° | 80° | — | — |
| 2011 | 89° | 60° | 75° | — | — |
| 2010 | 95° | 68° | 82° | — | — |
| 2009 | 81° | 59° | 70° | — | — |
| 2008 | 98° | 65° | 81° | — | — |
| 2007 | 76° | 58° | 67° | — | — |
| 2006 | 93° | 60° | 77° | — | — |
| 2005 | 100° | 65° | 82° | — | — |
| 2004 | 71° | 59° | 65° | — | — |
| 2003 | 90° | 59° | 74° | — | — |
| 2002 | 75° | 58° | 66° | — | — |
| 2001 | 101° | 59° | 80° | — | — |
| 2000 | 80° | 61° | 70° | — | — |
| 1999 | 102° | 62° | 82° | — | — |
| 1998 | 73° | 53° | 63° | — | — |
| 1983 | 68° | 60° | 64° | 0.41" | — |
| 1982 | 70° | 57° | 63° | — | — |
| 1981 | 82° | 58° | 70° | — | — |
| 1980 | 104° | 56° | 80° | — | — |
| 1979 | 83° | 57° | 70° | — | — |
| 1978 | 100° | 68° | 84° | — | — |
| 1977 | 76° | 51° | 63° | — | — |
| 1976 | 75° | 59° | 67° | — | — |
| 1975 | 76° | 48° | 62° | — | — |
| 1974 | 89° | 55° | 72° | — | — |
| 1973 | 90° | 57° | 73° | — | — |
| 1972 | 90° | 56° | 73° | — | — |
| 1971coldest | 75° | 44° | 60° | — | — |
41 years of data from ONTARIO INTL AP