Weather on May 10
Ontario, CA
55 Years of Data
Avg High
78°F
Avg Low
52°F
Warmest
2025
84°F avg
Coldest
1977
54°F avg
About This Date
May 10th in Ontario, CA typically brings pleasant spring weather, with average highs around 78°F and lows near 52°F — a 26°F daily swing. Over 41 years of records, the warmest May 10th was in 2025 (84°F average), while the coldest was 1977 (54°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 5% of May 10th dates historically, with the wettest May 10th recording 1.7" of rain. The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
Planning for May 10th in Ontario, CA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 103° | 66° | 84° | — | — |
| 2024 | 81° | 54° | 67° | — | — |
| 2023 | 65° | 51° | 58° | — | — |
| 2022 | 72° | 48° | 60° | — | — |
| 2021 | 73° | 56° | 64° | — | — |
| 2020 | 83° | 60° | 71° | — | — |
| 2019 | 70° | 59° | 64° | — | — |
| 2018 | 83° | 57° | 70° | — | — |
| 2017 | 67° | 56° | 61° | — | — |
| 2016 | 76° | 55° | 65° | — | — |
| 2015 | 81° | 52° | 66° | — | — |
| 2014 | 76° | 55° | 65° | — | — |
| 2013 | 87° | 58° | 72° | — | — |
| 2012 | 83° | 56° | 69° | — | — |
| 2011 | 69° | 50° | 60° | — | — |
| 2010 | 68° | 49° | 58° | — | — |
| 2009 | 83° | 57° | 70° | — | — |
| 2008 | 77° | 55° | 66° | — | — |
| 2007 | 90° | 55° | 72° | — | — |
| 2006 | 89° | 55° | 72° | — | — |
| 2005 | 73° | 49° | 61° | — | — |
| 2004 | 79° | 56° | 67° | — | — |
| 2003 | 75° | 46° | 61° | — | — |
| 2002 | 74° | 51° | 62° | — | — |
| 2001 | 88° | 58° | 73° | — | — |
| 2000 | 73° | 56° | 64° | — | — |
| 1999 | 73° | 52° | 62° | — | — |
| 1984 | 89° | 51° | 70° | — | — |
| 1983 | 67° | 52° | 59° | — | — |
| 1982 | 62° | 49° | 55° | — | — |
| 1981 | 91° | 51° | 71° | — | — |
| 1980 | 60° | 49° | 54° | 1.7" | — |
| 1979 | 80° | 42° | 61° | — | — |
| 1978 | 78° | 46° | 62° | — | — |
| 1977coldest | 63° | 46° | 54° | 0.81" | — |
| 1976 | 82° | 50° | 66° | — | — |
| 1975 | 84° | 46° | 65° | — | — |
| 1974 | 70° | 51° | 60° | — | — |
| 1973 | 89° | 54° | 71° | — | — |
| 1972 | 77° | 44° | 61° | — | — |
| 1971 | 76° | 48° | 62° | — | — |
41 years of data from ONTARIO INTL AP