Weather on March 19
Ontario, CA
55 Years of Data
Avg High
72°F
Avg Low
47°F
Warmest
2026
81°F avg
Coldest
1979
46°F avg
About This Date
March 19th 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 19th was in 2026 (81°F average), while the coldest was 1979 (46°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 24% of March 19th dates historically, with the wettest March 19th recording 2.08" of rain. The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
Planning for March 19th in Ontario, CA? Great weather for outdoor activities.
Warming Trend
1.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 100° | 63° | 81° | — | — |
| 2025 | 77° | 44° | 61° | — | — |
| 2024 | 73° | 49° | 61° | — | — |
| 2023 | 65° | 51° | 58° | 0.3" | — |
| 2022 | 70° | 52° | 61° | 0.15" | — |
| 2021 | 75° | 48° | 62° | — | — |
| 2020 | 57° | 48° | 53° | 0.69" | — |
| 2019 | 77° | 56° | 66° | — | — |
| 2018 | 74° | 46° | 60° | — | — |
| 2017 | 84° | 53° | 69° | — | — |
| 2016 | 78° | 53° | 66° | — | — |
| 2015 | 80° | 58° | 69° | — | — |
| 2014 | 81° | 50° | 65° | — | — |
| 2013 | 70° | 50° | 60° | — | — |
| 2012 | 59° | 39° | 49° | — | — |
| 2011 | 62° | 50° | 56° | 0.1" | — |
| 2010 | 79° | 49° | 64° | — | — |
| 2009 | 81° | 52° | 66° | — | — |
| 2008 | 73° | 46° | 60° | — | — |
| 2007 | 64° | 52° | 58° | — | — |
| 2006 | 62° | 38° | 50° | 0.18" | — |
| 2005 | 60° | 47° | 53° | 0.3" | — |
| 2004 | 80° | 53° | 67° | — | — |
| 2003 | 69° | 42° | 56° | — | — |
| 2002 | 74° | 41° | 57° | — | — |
| 2001 | 87° | 52° | 69° | — | — |
| 2000 | 76° | 49° | 62° | — | — |
| 1999 | 74° | 43° | 58° | — | — |
| 1984 | 91° | 52° | 71° | — | — |
| 1983 | 61° | 36° | 48° | 0.76" | — |
| 1982 | 57° | 37° | 47° | 0.46" | — |
| 1981 | 64° | 49° | 56° | — | — |
| 1980 | 67° | 40° | 53° | 0.36" | — |
| 1979coldest | 52° | 40° | 46° | 2.08" | — |
| 1978 | 70° | 47° | 58° | — | — |
| 1977 | 68° | 38° | 53° | — | — |
| 1976 | 65° | 47° | 56° | — | — |
| 1975 | 74° | 45° | 59° | — | — |
| 1974 | 60° | 46° | 53° | — | — |
| 1973 | 65° | 39° | 52° | — | — |
| 1972 | 75° | 42° | 59° | — | — |
| 1971 | 77° | 42° | 60° | — | — |
42 years of data from ONTARIO INTL AP