Weather on May 9
Rancho Cucamonga, CA
55 Years of Data
Avg High
77°F
Avg Low
53°F
Warmest
2025
79°F avg
Coldest
1977
47°F avg
About This Date
May 9th in Rancho Cucamonga, CA typically brings pleasant spring weather, with average highs around 77°F and lows near 53°F. Over 41 years of records, the warmest May 9th was in 2025 (79°F average), while the coldest was 1977 (47°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 7% of May 9th dates historically, with the wettest May 9th recording 5.11" of rain. The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
Planning for May 9th in Rancho Cucamonga, CA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 100° | 57° | 79° | — | — |
| 2024 | 82° | 55° | 69° | — | — |
| 2023 | 69° | 52° | 60° | — | — |
| 2022 | 69° | 52° | 60° | — | — |
| 2021 | 76° | 57° | 66° | — | — |
| 2020 | 86° | 61° | 73° | — | — |
| 2019 | 68° | 60° | 64° | — | — |
| 2018 | 88° | 57° | 72° | — | — |
| 2017 | 73° | 52° | 62° | — | — |
| 2016 | 72° | 57° | 64° | — | — |
| 2015 | 66° | 54° | 60° | — | — |
| 2014 | 76° | 54° | 65° | — | — |
| 2013 | 77° | 54° | 65° | — | — |
| 2012 | 91° | 58° | 74° | — | — |
| 2011 | 64° | 52° | 58° | — | — |
| 2010 | 68° | 51° | 60° | — | — |
| 2009 | 86° | 57° | 72° | — | — |
| 2008 | 68° | 52° | 60° | — | — |
| 2007 | 94° | 62° | 78° | — | — |
| 2006 | 72° | 57° | 64° | — | — |
| 2005 | 66° | 51° | 59° | — | — |
| 2004 | 87° | 55° | 71° | — | — |
| 2003 | 69° | 49° | 59° | — | — |
| 2002 | 79° | 52° | 65° | — | — |
| 2001 | 90° | 61° | 75° | — | — |
| 2000 | 81° | 55° | 68° | — | — |
| 1999 | 66° | 54° | 60° | — | — |
| 1984 | 98° | 54° | 76° | — | — |
| 1983 | 72° | 51° | 61° | — | — |
| 1982 | 63° | 50° | 56° | — | — |
| 1981 | 95° | 51° | 73° | — | — |
| 1980 | 61° | 51° | 56° | 0.25" | — |
| 1979 | 72° | 40° | 56° | 0.08" | — |
| 1978 | 85° | 55° | 70° | — | — |
| 1977coldest | 50° | 44° | 47° | 5.11" | — |
| 1976 | 82° | 49° | 65° | — | — |
| 1975 | 85° | 43° | 64° | — | — |
| 1974 | 70° | 53° | 61° | — | — |
| 1973 | 87° | 50° | 69° | — | — |
| 1972 | 74° | 43° | 58° | — | — |
| 1971 | 72° | 47° | 59° | — | — |
41 years of data from ONTARIO INTL AP