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Ontario, CA Weather on April 9
April 9th in Ontario, CA typically brings pleasant spring weather, with average highs around 73°F and lows near 48°F — a 25°F daily swing. Over 42 years of records, the warmest April 9th was in 2014 (77°F average), while the coldest was 2001 (46°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 14% of April 9th dates historically, with the wettest April 9th recording 1.68" of rain. The last decade has been 7.4°F warmer on this date compared to 20-30 years ago.
What to Expect on April 9
Planning for April 9th in Ontario, CA? Great weather for outdoor activities.
April 9 Weather Records for Ontario
- •The all-time record high for April 9th in Ontario, CA is 96°F, set in 2018.
- •The coldest April 9th on record dropped to 35°F in 1999.
- •Temperatures have reached 90°F or higher on April 9th in 2 of the last 42 years.
Frequently Asked Questions
What was the warmest April 9 ever in Ontario?
The warmest April 9 in Ontario, CA reached 96°F in 2018. That is 23°F above the long-term average high of 73°F.
What was the coldest April 9 ever in Ontario?
The coldest April 9 in Ontario, CA dropped to 35°F in 1999. That is 13°F below the long-term average low of 48°F.
What is the average temperature on April 9 in Ontario?
On April 9, Ontario averages a high of 73°F and a low of 48°F based on 42 years of NOAA weather observations from ONTARIO INTL AP.
How many years of weather data are available for April 9 in Ontario?
We have 42 years of weather records for April 9 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.
April 9 Weather History in Ontario
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 89°F | 57°F | 0" | -- |
| 2024 | 80°F | 45°F | 0" | -- |
| 2023 | 83°F | 50°F | 0" | -- |
| 2022 | 89°F | 59°F | 0" | -- |
| 2021 | 83°F | 52°F | 0" | -- |
| 2020 | 53°F | 47°F | 1.68" | -- |
| 2019 | 79°F | 58°F | 0" | -- |
| 2018 | 96°F | 52°F | 0" | -- |
| 2017 | 74°F | 44°F | 0" | -- |
| 2016 | 65°F | 55°F | 0.08" | -- |
| 2015 | 78°F | 48°F | 0" | -- |
| 2014 | 93°F | 61°F | 0" | -- |
| 2013 | 74°F | 45°F | 0" | -- |
| 2012 | 84°F | 48°F | 0" | -- |
| 2011 | 58°F | 39°F | 0" | -- |
| 2010 | 78°F | 51°F | 0" | -- |
| 2009 | 67°F | 50°F | 0" | -- |
| 2008 | 67°F | 47°F | 0" | -- |
| 2007 | 69°F | 52°F | 0" | -- |
| 2006 | 67°F | 49°F | 0" | -- |
| 2005 | 66°F | 45°F | 0" | -- |
| 2004 | 76°F | 56°F | 0" | -- |
| 2003 | 86°F | 53°F | 0" | -- |
| 2002 | 75°F | 48°F | 0" | -- |
| 2001 | 52°F | 40°F | 0.79" | -- |
| 2000 | 75°F | 47°F | 0" | -- |
| 1999 | 59°F | 35°F | 0" | -- |
| 1998 | 72°F | 41°F | 0" | -- |
| 1984 | 74°F | -- | 0" | -- |
| 1983 | 66°F | 43°F | 0" | -- |
| 1982 | 71°F | 46°F | 0" | -- |
| 1981 | 74°F | 43°F | 0" | -- |
| 1980 | 83°F | 51°F | 0" | -- |
| 1979 | 59°F | 53°F | 0.13" | -- |
| 1978 | 67°F | 40°F | 0.08" | -- |
| 1977 | 67°F | 41°F | 0" | -- |
| 1976 | 68°F | 40°F | 0" | -- |
| 1975 | 63°F | 41°F | 1.27" | -- |
| 1974 | 78°F | 46°F | 0" | -- |
| 1973 | 76°F | 46°F | 0" | -- |
| 1972 | 77°F | 43°F | 0" | -- |
| 1971 | 74°F | 42°F | 0" | -- |
Based on 42 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.