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Ontario, CA Weather on October 10
October 10th in Ontario, CA typically brings warm fall weather, with average highs around 82°F and lows near 56°F — a 26°F daily swing. Over 41 years of records, the warmest October 10th was in 2015 (85°F average), while the coldest was 1974 (57°F) — a 28°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
What to Expect on October 10
Planning for October 10th in Ontario, CA? Stay hydrated and seek shade during peak afternoon hours.
October 10 Weather Records for Ontario
- •The all-time record high for October 10th in Ontario, CA is 100°F, set in 2015.
- •The coldest October 10th on record dropped to 43°F in 1973.
- •Temperatures have reached 90°F or higher on October 10th in 10 of the last 41 years.
- •Last year (1971), October 10th was 18°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest October 10 ever in Ontario?
The warmest October 10 in Ontario, CA reached 100°F in 2015. That is 18°F above the long-term average high of 82°F.
What was the coldest October 10 ever in Ontario?
The coldest October 10 in Ontario, CA dropped to 43°F in 1973. That is 13°F below the long-term average low of 56°F.
What is the average temperature on October 10 in Ontario?
On October 10, Ontario averages a high of 82°F and a low of 56°F based on 41 years of NOAA weather observations from ONTARIO INTL AP.
How many years of weather data are available for October 10 in Ontario?
We have 41 years of weather records for October 10 in Ontario, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
October 10 Weather History in Ontario
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 93°F | 65°F | 0" | -- |
| 2024 | 91°F | 57°F | 0" | -- |
| 2023 | 78°F | 57°F | 0" | -- |
| 2022 | 85°F | 62°F | 0" | -- |
| 2021 | 86°F | 52°F | 0" | -- |
| 2020 | 78°F | 63°F | 0" | -- |
| 2019 | 86°F | 59°F | 0" | -- |
| 2018 | 76°F | 58°F | 0" | -- |
| 2017 | 89°F | 52°F | 0" | -- |
| 2016 | 91°F | 59°F | 0" | -- |
| 2015 | 100°F | 70°F | 0" | -- |
| 2014 | 85°F | 60°F | 0" | -- |
| 2013 | 67°F | 48°F | 0" | -- |
| 2012 | 75°F | 59°F | 0" | -- |
| 2011 | 82°F | 55°F | 0" | -- |
| 2010 | 95°F | 58°F | 0" | -- |
| 2009 | 76°F | 53°F | 0" | -- |
| 2008 | 74°F | 57°F | 0" | -- |
| 2007 | 76°F | 51°F | 0" | -- |
| 2006 | 77°F | 55°F | 0" | -- |
| 2005 | 91°F | 54°F | 0" | -- |
| 2004 | 73°F | 56°F | 0" | -- |
| 2003 | 74°F | 60°F | 0" | -- |
| 2002 | 79°F | 57°F | 0" | -- |
| 2001 | 86°F | 54°F | 0" | -- |
| 2000 | 67°F | 51°F | 0" | -- |
| 1999 | 96°F | 59°F | 0" | -- |
| 1998 | 78°F | 51°F | 0" | -- |
| 1983 | 79°F | 50°F | 0" | -- |
| 1982 | 79°F | 66°F | 0" | -- |
| 1981 | 75°F | 59°F | 0" | -- |
| 1980 | 85°F | 54°F | 0" | -- |
| 1979 | 81°F | 51°F | 0" | -- |
| 1978 | 91°F | 58°F | 0" | -- |
| 1977 | 78°F | 53°F | 0" | -- |
| 1976 | 90°F | 58°F | 0" | -- |
| 1975 | 70°F | 44°F | 0" | -- |
| 1974 | 70°F | 44°F | 0" | -- |
| 1973 | 74°F | 43°F | 0" | -- |
| 1972 | 70°F | 48°F | 0" | -- |
| 1971 | 100°F | 64°F | 0" | -- |
Based on 41 years of data from NOAA station: ONTARIO INTL AP
Monthly Climate Averages
Historical temperature and precipitation averages for Ontario, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.