Weather on October 27
Ontario, CA
55 Years of Data
Avg High
78°F
Avg Low
53°F
Warmest
2008
77°F avg
Coldest
1971
52°F avg
About This Date
October 27th in Ontario, CA typically brings pleasant fall weather, with average highs around 78°F and lows near 53°F — a 25°F daily swing. Over 40 years of records, the warmest October 27th was in 2008 (77°F average), while the coldest was 1971 (52°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 5% of October 27th dates historically, with the wettest October 27th recording 3.48" of rain. The last decade has been 6.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.3°F warmer on this date compared to 20-30 years ago.
Planning for October 27th in Ontario, CA? Great weather for outdoor activities.
Warming Trend
1.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 54° | 64° | — | — |
| 2024 | 87° | 60° | 74° | — | — |
| 2023 | 73° | 57° | 65° | — | — |
| 2022 | 78° | 54° | 66° | — | — |
| 2021 | 88° | 52° | 70° | — | — |
| 2020 | 79° | 46° | 62° | — | — |
| 2019 | 75° | 54° | 64° | — | — |
| 2018 | 92° | 59° | 75° | — | — |
| 2017 | 91° | 58° | 74° | — | — |
| 2016 | 82° | 59° | 71° | — | — |
| 2015 | 86° | 56° | 71° | — | — |
| 2014 | 79° | 58° | 68° | — | — |
| 2013 | 77° | 52° | 64° | — | — |
| 2012 | 92° | 53° | 72° | — | — |
| 2011 | 77° | 46° | 62° | — | — |
| 2010 | 79° | 51° | 65° | — | — |
| 2009 | 70° | 53° | 61° | — | — |
| 2008warmest | 96° | 57° | 77° | — | — |
| 2007 | 78° | 56° | 67° | — | — |
| 2006 | 87° | 49° | 68° | — | — |
| 2005 | 65° | 56° | 60° | — | — |
| 2004 | 61° | 50° | 55° | 3.48" | — |
| 2003 | 92° | 56° | 74° | — | — |
| 2002 | 68° | 52° | 60° | — | — |
| 2001 | 77° | 56° | 66° | — | — |
| 2000 | 63° | 52° | 57° | 0.36" | — |
| 1999 | 79° | 51° | 65° | — | — |
| 1998 | 72° | 50° | 61° | — | — |
| 1983 | 86° | 56° | 71° | — | — |
| 1981 | 68° | 53° | 61° | — | — |
| 1980 | 75° | 60° | 68° | — | — |
| 1979 | 78° | 50° | 64° | — | — |
| 1978 | 85° | 55° | 70° | — | — |
| 1977 | 74° | 52° | 63° | — | — |
| 1976 | 75° | 53° | 64° | — | — |
| 1975 | 68° | 44° | 56° | — | — |
| 1974 | 62° | 52° | 57° | — | — |
| 1973 | 87° | 52° | 69° | — | — |
| 1972 | 66° | 44° | 55° | — | — |
| 1971coldest | 59° | 45° | 52° | — | — |
40 years of data from ONTARIO INTL AP