Weather on October 30
Ontario, CA
55 Years of Data
Avg High
76°F
Avg Low
51°F
Warmest
2025
76°F avg
Coldest
1971
48°F avg
About This Date
October 30th in Ontario, CA typically brings pleasant fall weather, with average highs around 76°F and lows near 51°F — a 25°F daily swing. Over 40 years of records, the warmest October 30th was in 2025 (76°F average), while the coldest was 1971 (48°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 15% of October 30th dates historically. The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
Planning for October 30th in Ontario, CA? Great weather for outdoor activities.
Warming Trend
2.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 92° | 61° | 76° | — | — |
| 2024 | 74° | 49° | 61° | — | — |
| 2023 | 79° | 50° | 64° | — | — |
| 2022 | 84° | 49° | 66° | — | — |
| 2021 | 81° | 55° | 68° | — | — |
| 2020 | 88° | 55° | 71° | — | — |
| 2019 | 72° | 44° | 58° | — | — |
| 2018 | 77° | 57° | 67° | — | — |
| 2017 | 69° | 60° | 65° | — | — |
| 2016 | 70° | 60° | 65° | 0.03" | — |
| 2015 | 86° | 61° | 73° | — | — |
| 2014 | 86° | 59° | 73° | — | — |
| 2013 | 71° | 48° | 60° | — | — |
| 2012 | 86° | 53° | 70° | — | — |
| 2011 | 89° | 51° | 70° | — | — |
| 2010 | 67° | 51° | 59° | 0.1" | — |
| 2009 | 75° | 45° | 60° | — | — |
| 2008 | 87° | 60° | 74° | — | — |
| 2007 | 73° | 54° | 63° | — | — |
| 2006 | 68° | 52° | 60° | — | — |
| 2005 | 77° | 49° | 63° | — | — |
| 2004 | 72° | 45° | 58° | — | — |
| 2003 | 69° | 54° | 61° | — | — |
| 2002 | 68° | 54° | 61° | — | — |
| 2001 | 73° | 55° | 64° | 0.03" | — |
| 2000 | 63° | 51° | 57° | — | — |
| 1999 | 91° | 51° | 71° | — | — |
| 1998 | 70° | 50° | 60° | — | — |
| 1983 | 75° | 57° | 66° | — | — |
| 1981 | 71° | 43° | 57° | — | — |
| 1980 | 86° | 45° | 65° | — | — |
| 1979 | 72° | 43° | 57° | — | — |
| 1978 | 78° | 49° | 63° | 0.08" | — |
| 1977 | 68° | 45° | 56° | — | — |
| 1976 | 74° | 45° | 59° | — | — |
| 1975 | 69° | 48° | 59° | 0.18" | — |
| 1974 | 62° | 42° | 52° | 0.13" | — |
| 1973 | 83° | 54° | 68° | — | — |
| 1972 | 63° | 44° | 53° | — | — |
| 1971coldest | 65° | 32° | 48° | — | — |
40 years of data from ONTARIO INTL AP