Weather on May 27
Rancho Cucamonga, CA
55 Years of Data
Avg High
81°F
Avg Low
54°F
Warmest
2020
80°F avg
Coldest
1971
55°F avg
About This Date
May 27th in Rancho Cucamonga, CA typically brings warm spring weather, with average highs around 81°F and lows near 54°F — a 27°F daily swing. Over 42 years of records, the warmest May 27th was in 2020 (80°F average), while the coldest was 1971 (55°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 7% of May 27th dates historically, with the wettest May 27th recording 1.65" of rain. 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 May 27th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 60° | 72° | — | — |
| 2024 | 80° | 53° | 67° | — | — |
| 2023 | 74° | 56° | 65° | — | — |
| 2022 | 80° | 55° | 68° | — | — |
| 2021 | 82° | 58° | 70° | — | — |
| 2020warmest | 95° | 64° | 80° | — | — |
| 2019 | 68° | 51° | 60° | — | — |
| 2018 | 78° | 53° | 66° | — | — |
| 2017 | 79° | 56° | 67° | — | — |
| 2016 | 82° | 54° | 68° | — | — |
| 2015 | 79° | 58° | 68° | — | — |
| 2014 | 92° | 62° | 77° | — | — |
| 2013 | 82° | 57° | 70° | — | — |
| 2012 | 80° | 48° | 64° | — | — |
| 2011 | 81° | 54° | 67° | — | — |
| 2010 | 71° | 56° | 63° | — | — |
| 2009 | 85° | 57° | 71° | — | — |
| 2008 | 73° | 49° | 61° | — | — |
| 2007 | 82° | 55° | 69° | — | — |
| 2006 | 70° | 56° | 63° | — | — |
| 2005 | 80° | 56° | 68° | — | — |
| 2004 | 76° | 53° | 64° | — | — |
| 2003 | 97° | 59° | 78° | — | — |
| 2002 | 77° | 54° | 65° | — | — |
| 2001 | 68° | 59° | 64° | 0.03" | — |
| 2000 | 99° | 59° | 79° | — | — |
| 1999 | 85° | 57° | 71° | — | — |
| 1998 | 73° | 46° | 60° | — | — |
| 1984 | 98° | 55° | 77° | — | — |
| 1983 | 96° | 58° | 77° | — | — |
| 1982 | 65° | 57° | 61° | — | — |
| 1981 | 77° | 58° | 67° | 0.08" | — |
| 1980 | 65° | 48° | 56° | — | — |
| 1979 | 75° | 58° | 66° | — | — |
| 1978 | 84° | 45° | 64° | — | — |
| 1977 | 74° | 46° | 60° | — | — |
| 1976 | 84° | 50° | 67° | — | — |
| 1975 | 76° | 51° | 63° | — | — |
| 1974 | 89° | 58° | 73° | — | — |
| 1973 | 96° | 48° | 72° | — | — |
| 1972 | 89° | 47° | 68° | — | — |
| 1971coldest | 66° | 45° | 55° | 1.65" | — |
42 years of data from ONTARIO INTL AP