Weather on April 15
Ontario, CA
55 Years of Data
Avg High
73°F
Avg Low
48°F
Warmest
1984
72°F avg
Coldest
1973
48°F avg
About This Date
April 15th 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 15th was in 1984 (72°F average), while the coldest was 1973 (48°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 14% of April 15th dates historically, with the wettest April 15th recording 1.27" of rain. The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
Planning for April 15th in Ontario, CA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 52° | 59° | — | — |
| 2024 | 68° | 47° | 57° | — | — |
| 2023 | 79° | 47° | 63° | — | — |
| 2022 | 74° | 49° | 61° | — | — |
| 2021 | 72° | 48° | 60° | — | — |
| 2020 | 82° | 50° | 66° | — | — |
| 2019 | 76° | 55° | 65° | — | — |
| 2018 | 82° | 54° | 68° | — | — |
| 2017 | 80° | 50° | 65° | — | — |
| 2016 | 79° | 50° | 64° | — | — |
| 2015 | 81° | 50° | 65° | — | — |
| 2014 | 84° | 57° | 71° | — | — |
| 2013 | 62° | 52° | 57° | — | — |
| 2012 | 71° | 40° | 55° | — | — |
| 2011 | 86° | 50° | 68° | — | — |
| 2010 | 77° | 49° | 63° | — | — |
| 2009 | 61° | 41° | 51° | — | — |
| 2008 | 70° | 50° | 60° | — | — |
| 2007 | 59° | 48° | 54° | — | — |
| 2006 | 65° | 51° | 58° | 0.05" | — |
| 2005 | 84° | 51° | 68° | — | — |
| 2004 | 75° | 51° | 63° | — | — |
| 2003 | 63° | 45° | 54° | 0.1" | — |
| 2002 | 69° | 52° | 60° | 0.08" | — |
| 2001 | 74° | 47° | 60° | — | — |
| 2000 | 66° | 51° | 59° | — | — |
| 1999 | 88° | 50° | 69° | — | — |
| 1998 | 63° | 37° | 50° | — | — |
| 1984warmest | 96° | 49° | 72° | — | — |
| 1983 | 75° | 38° | 56° | — | — |
| 1982 | 64° | 51° | 58° | — | — |
| 1981 | 78° | 45° | 61° | — | — |
| 1980 | 83° | 45° | 64° | — | — |
| 1979 | 81° | 48° | 64° | — | — |
| 1978 | 61° | 50° | 55° | 1.14" | — |
| 1977 | 78° | 44° | 61° | — | — |
| 1976 | 55° | 43° | 49° | 1.27" | — |
| 1975 | 56° | 45° | 50° | 0.23" | — |
| 1974 | 86° | 46° | 66° | — | — |
| 1973coldest | 59° | 38° | 48° | — | — |
| 1972 | 79° | 41° | 60° | — | — |
| 1971 | 72° | 47° | 59° | — | — |
42 years of data from ONTARIO INTL AP