Weather on May 1
Ontario, CA
55 Years of Data
Avg High
76°F
Avg Low
52°F
Warmest
2014
80°F avg
Coldest
2018
53°F avg
About This Date
May 1st in Ontario, CA typically brings pleasant spring weather, with average highs around 76°F and lows near 52°F. Over 41 years of records, the warmest May 1st was in 2014 (80°F average), while the coldest was 2018 (53°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 7% of May 1st dates historically. The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for May 1st in Ontario, CA? Great weather for outdoor activities.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 74° | 55° | 64° | — | — |
| 2024 | 76° | 57° | 66° | — | — |
| 2023 | 67° | 53° | 60° | 0.05" | — |
| 2022 | 76° | 53° | 64° | — | — |
| 2021 | 85° | 57° | 71° | — | — |
| 2020 | 82° | 60° | 71° | — | — |
| 2019 | 78° | 57° | 68° | — | — |
| 2018coldest | 55° | 50° | 53° | 0.08" | — |
| 2017 | 90° | 57° | 73° | — | — |
| 2016 | 77° | 50° | 64° | — | — |
| 2015 | 93° | 64° | 79° | — | — |
| 2014warmest | 94° | 67° | 80° | — | — |
| 2013 | 87° | 59° | 73° | — | — |
| 2012 | 63° | 56° | 59° | — | — |
| 2011 | 81° | 49° | 65° | — | — |
| 2010 | 75° | 46° | 61° | — | — |
| 2009 | 78° | 56° | 67° | — | — |
| 2008 | 78° | 49° | 63° | — | — |
| 2007 | 76° | 57° | 66° | — | — |
| 2006 | 81° | 55° | 68° | — | — |
| 2005 | 73° | 52° | 62° | — | — |
| 2004 | 94° | 55° | 74° | — | — |
| 2003 | 71° | 49° | 60° | — | — |
| 2002 | 65° | 47° | 56° | — | — |
| 2001 | 80° | 52° | 66° | — | — |
| 2000 | 89° | 55° | 72° | — | — |
| 1999 | 71° | 42° | 57° | — | — |
| 1984 | 74° | 43° | 58° | — | — |
| 1983 | 63° | 47° | 55° | — | — |
| 1982 | 75° | 53° | 64° | — | — |
| 1981 | 81° | 55° | 68° | — | — |
| 1980 | 65° | 51° | 58° | — | — |
| 1979 | 65° | 51° | 58° | — | — |
| 1978 | 61° | 56° | 58° | 0.1" | — |
| 1977 | 71° | 51° | 61° | — | — |
| 1976 | 91° | 55° | 73° | — | — |
| 1975 | 69° | 49° | 59° | — | — |
| 1974 | 81° | 47° | 64° | — | — |
| 1973 | 75° | 43° | 59° | — | — |
| 1972 | 81° | 46° | 63° | — | — |
| 1971 | 73° | 46° | 60° | — | — |
41 years of data from ONTARIO INTL AP