Weather on April 1
Ontario, CA
55 Years of Data
Avg High
73°F
Avg Low
47°F
Warmest
1998
83°F avg
Coldest
1977
47°F avg
About This Date
April 1st in Ontario, CA typically brings pleasant spring weather, with average highs around 73°F and lows near 47°F — a 26°F daily swing. Over 43 years of records, the warmest April 1st was in 1998 (83°F average), while the coldest was 1977 (47°F) — a 36°F range across recorded history. Rain or other precipitation has occurred on about 23% of April 1st dates historically, with the wettest April 1st recording 3.51" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for April 1st in Ontario, CA? Great weather for outdoor activities.
Warming Trend
1.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 73° | 58° | 65° | 0.53" | — |
| 2025 | 66° | 50° | 58° | — | — |
| 2024 | 71° | 43° | 57° | — | — |
| 2023 | 72° | 45° | 58° | — | — |
| 2022 | 72° | 55° | 63° | — | — |
| 2021 | 87° | 51° | 69° | — | — |
| 2020 | 75° | 54° | 64° | — | — |
| 2019 | 87° | 60° | 74° | — | — |
| 2018 | 74° | 53° | 63° | — | — |
| 2017 | 79° | 43° | 61° | — | — |
| 2016 | 78° | 47° | 62° | — | — |
| 2015 | 77° | 55° | 66° | — | — |
| 2014 | 63° | 48° | 55° | 0.33" | — |
| 2013 | 66° | 54° | 60° | — | — |
| 2012 | 66° | 43° | 54° | — | — |
| 2011 | 91° | 59° | 75° | — | — |
| 2010 | 63° | 45° | 54° | — | — |
| 2009 | 72° | 46° | 59° | — | — |
| 2008 | 66° | 45° | 55° | — | — |
| 2007 | 82° | 49° | 65° | — | — |
| 2006 | 63° | 47° | 55° | 0.38" | — |
| 2005 | 82° | 45° | 63° | — | — |
| 2004 | 61° | 50° | 55° | 0.58" | — |
| 2003 | 76° | 50° | 63° | — | — |
| 2002 | 77° | 49° | 63° | — | — |
| 2001 | 63° | 55° | 59° | — | — |
| 2000 | 82° | 55° | 69° | — | — |
| 1999 | 55° | 39° | 47° | 0.84" | — |
| 1998warmest | 127° | 40° | 83° | 0.64" | — |
| 1984 | 64° | 35° | 50° | 0.15" | — |
| 1983 | 80° | 48° | 64° | — | — |
| 1982 | 59° | 45° | 52° | 3.51" | — |
| 1981 | 67° | 42° | 54° | — | — |
| 1980 | 66° | 39° | 53° | 0.3" | — |
| 1979 | 72° | 42° | 57° | — | — |
| 1978 | 66° | 45° | 55° | 0.3" | — |
| 1977coldest | 56° | 39° | 47° | — | — |
| 1976 | 77° | 43° | 60° | — | — |
| 1975 | 61° | 38° | 49° | — | — |
| 1974 | 64° | 40° | 52° | — | — |
| 1973 | 63° | 45° | 54° | — | — |
| 1972 | 79° | 48° | 63° | — | — |
| 1971 | 82° | 44° | 63° | — | — |
43 years of data from ONTARIO INTL AP