Weather on March 15
Ontario, CA
55 Years of Data
Avg High
72°F
Avg Low
47°F
Warmest
2015
76°F avg
Coldest
2021
46°F avg
About This Date
March 15th in Ontario, CA typically brings pleasant spring weather, with average highs around 72°F and lows near 47°F — a 25°F daily swing. Over 42 years of records, the warmest March 15th was in 2015 (76°F average), while the coldest was 2021 (46°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 17% of March 15th dates historically, with the wettest March 15th recording 6.43" of rain. The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
Planning for March 15th in Ontario, CA? Great weather for outdoor activities.
Warming Trend
1.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 86° | 54° | 70° | — | — |
| 2025 | 63° | 43° | 53° | — | — |
| 2024 | 65° | 50° | 57° | — | — |
| 2023 | 60° | 50° | 55° | 2.79" | — |
| 2022 | 81° | 53° | 67° | — | — |
| 2021coldest | 53° | 39° | 46° | 0.46" | — |
| 2020 | 62° | 51° | 57° | — | — |
| 2019 | 76° | 61° | 68° | — | — |
| 2018 | 63° | 47° | 55° | 0.36" | — |
| 2017 | 88° | 59° | 73° | — | — |
| 2016 | 83° | 50° | 66° | — | — |
| 2015warmest | 92° | 60° | 76° | — | — |
| 2014 | 87° | 49° | 68° | — | — |
| 2013 | 86° | 55° | 71° | — | — |
| 2012 | 71° | 48° | 60° | — | — |
| 2011 | 81° | 51° | 66° | — | — |
| 2010 | 81° | 46° | 63° | — | — |
| 2009 | 60° | 47° | 53° | — | — |
| 2008 | 61° | 45° | 53° | 0.08" | — |
| 2007 | 83° | 51° | 67° | — | — |
| 2006 | 63° | 45° | 54° | — | — |
| 2005 | 73° | 52° | 62° | — | — |
| 2004 | 79° | 51° | 65° | — | — |
| 2003 | 57° | 54° | 55° | 6.43" | — |
| 2002 | 63° | 37° | 50° | — | — |
| 2001 | 68° | 51° | 60° | — | — |
| 2000 | 77° | 47° | 62° | — | — |
| 1999 | 54° | 40° | 47° | 0.28" | — |
| 1984 | 70° | 48° | 59° | — | — |
| 1983 | 69° | 42° | 56° | — | — |
| 1982 | 59° | 48° | 54° | 1.91" | — |
| 1981 | 72° | 39° | 55° | — | — |
| 1980 | 68° | 43° | 55° | — | — |
| 1979 | 62° | 43° | 52° | — | — |
| 1978 | 79° | 44° | 61° | — | — |
| 1977 | 63° | 32° | 47° | — | — |
| 1976 | 79° | 41° | 60° | — | — |
| 1975 | 60° | 34° | 47° | — | — |
| 1974 | 83° | 48° | 65° | — | — |
| 1973 | 68° | 37° | 53° | — | — |
| 1972 | 83° | 45° | 64° | — | — |
| 1971 | 73° | 37° | 55° | — | — |
42 years of data from ONTARIO INTL AP