Weather on August 27
Rancho Cucamonga, CA
55 Years of Data
Avg High
95°F
Avg Low
64°F
Warmest
1981
90°F avg
Coldest
1972
66°F avg
About This Date
August 27th in Rancho Cucamonga, CA typically brings hot summer weather, with average highs around 95°F and lows near 64°F — a 31°F daily swing. Over 42 years of records, the warmest August 27th was in 1981 (90°F average), while the coldest was 1972 (66°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 27th dates historically. 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 August 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 | 98° | 69° | 84° | — | — |
| 2024 | 93° | 66° | 80° | — | — |
| 2023 | 102° | 66° | 84° | — | — |
| 2022 | 91° | 66° | 79° | — | — |
| 2021 | 104° | 69° | 87° | — | — |
| 2020 | 103° | 71° | 87° | — | — |
| 2019 | 96° | 69° | 83° | — | — |
| 2018 | 88° | 63° | 75° | — | — |
| 2017 | 99° | 66° | 82° | — | — |
| 2016 | 84° | 60° | 72° | — | — |
| 2015 | 103° | 73° | 88° | — | — |
| 2014 | 97° | 68° | 82° | — | — |
| 2013 | 97° | 75° | 86° | — | — |
| 2012 | 100° | 63° | 81° | — | — |
| 2011 | 107° | 74° | 90° | — | — |
| 2010 | 94° | 61° | 77° | — | — |
| 2009 | 108° | 66° | 87° | — | — |
| 2008 | 93° | 65° | 79° | — | — |
| 2007 | 95° | 67° | 81° | — | — |
| 2006 | 97° | 63° | 80° | — | — |
| 2005 | 101° | 71° | 86° | — | — |
| 2004 | 89° | 62° | 76° | — | — |
| 2003 | 95° | 69° | 82° | — | — |
| 2002 | 89° | 60° | 75° | — | — |
| 2001 | 97° | 64° | 80° | — | — |
| 2000 | 84° | 63° | 73° | — | — |
| 1999 | 99° | 67° | 83° | — | — |
| 1998 | 98° | 64° | 81° | — | — |
| 1984 | 105° | 62° | 84° | — | — |
| 1983 | 101° | 61° | 81° | — | — |
| 1982 | 94° | 67° | 80° | — | — |
| 1981warmest | 111° | 70° | 90° | — | — |
| 1980 | 93° | 55° | 74° | — | — |
| 1979 | 93° | 60° | 77° | — | — |
| 1978 | 88° | 55° | 71° | — | — |
| 1977 | 83° | 62° | 72° | — | — |
| 1976 | 94° | 59° | 76° | — | — |
| 1975 | 88° | 54° | 71° | — | — |
| 1974 | 91° | 55° | 73° | — | — |
| 1973 | 80° | 51° | 66° | — | — |
| 1972coldest | 76° | 57° | 66° | 0.1" | — |
| 1971 | 100° | 51° | 76° | — | — |
42 years of data from ONTARIO INTL AP