Weather on May 4
Rancho Cucamonga, CA
55 Years of Data
Avg High
77°F
Avg Low
53°F
Warmest
2004
81°F avg
Coldest
1971
54°F avg
About This Date
May 4th 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 4th was in 2004 (81°F average), while the coldest was 1971 (54°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 12% of May 4th dates historically, with the wettest May 4th recording 1.78" of rain. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for May 4th in Rancho Cucamonga, CA? Great weather for outdoor activities.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 59° | 53° | 56° | 0.13" | — |
| 2024 | 65° | 54° | 59° | 0.05" | — |
| 2023 | 63° | 47° | 55° | 1.78" | — |
| 2022 | 89° | 54° | 71° | — | — |
| 2021 | 91° | 56° | 73° | — | — |
| 2020 | 90° | 56° | 73° | — | — |
| 2019 | 83° | 56° | 69° | — | — |
| 2018 | 92° | 56° | 74° | — | — |
| 2017 | 92° | 59° | 75° | — | — |
| 2016 | 80° | 54° | 67° | — | — |
| 2015 | 74° | 54° | 64° | — | — |
| 2014 | 87° | 60° | 74° | — | — |
| 2013 | 82° | 57° | 70° | — | — |
| 2012 | 72° | 57° | 64° | — | — |
| 2011 | 94° | 58° | 76° | — | — |
| 2010 | 82° | 56° | 69° | — | — |
| 2009 | 80° | 55° | 68° | — | — |
| 2008 | 74° | 53° | 63° | — | — |
| 2007 | 67° | 50° | 58° | — | — |
| 2006 | 70° | 57° | 63° | — | — |
| 2005 | 76° | 55° | 65° | — | — |
| 2004warmest | 95° | 66° | 81° | — | — |
| 2003 | 66° | 50° | 58° | — | — |
| 2002 | 78° | 49° | 63° | — | — |
| 2001 | 81° | 46° | 63° | — | — |
| 2000 | 81° | 57° | 69° | — | — |
| 1999 | 68° | 50° | 59° | — | — |
| 1984 | 83° | 49° | 66° | — | — |
| 1983 | 67° | 46° | 56° | — | — |
| 1982 | 72° | 56° | 64° | 0.18" | — |
| 1981 | 71° | 55° | 63° | — | — |
| 1980 | 82° | 51° | 67° | — | — |
| 1979 | 82° | 48° | 65° | — | — |
| 1978 | 69° | 53° | 61° | — | — |
| 1977 | 72° | 47° | 59° | — | — |
| 1976 | 73° | 51° | 62° | — | — |
| 1975 | 70° | 49° | 59° | — | — |
| 1974 | 64° | 49° | 56° | — | — |
| 1973 | 77° | 46° | 62° | — | — |
| 1972 | 70° | 53° | 61° | — | — |
| 1971coldest | 63° | 46° | 54° | 0.33" | — |
41 years of data from ONTARIO INTL AP