Weather on March 15
Ontario, CA
55 Years of Data
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.
| 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° | — | — |
Ontario, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Ontario, CA Monthly Precipitation
Average rainfall per month, in inches.
Ontario, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Ontario, CA
Ontario, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.