Weather on May 8
Ontario, CA
55 Years of Data
Avg High
77°F
Avg Low
53°F
Warmest
1984
79°F avg
Coldest
1977
53°F avg
About This Date
May 8th in Ontario, CA typically brings pleasant spring weather, with average highs around 77°F and lows near 53°F. Over 41 years of records, the warmest May 8th was in 1984 (79°F average), while the coldest was 1977 (53°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 5% of May 8th dates historically, with the wettest May 8th recording 3.23" 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 May 8th in Ontario, CA? Great weather for outdoor activities.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 89° | 56° | 72° | — | — |
| 2024 | 78° | 52° | 65° | — | — |
| 2023 | 74° | 52° | 63° | — | — |
| 2022 | 68° | 53° | 61° | — | — |
| 2021 | 79° | 59° | 69° | — | — |
| 2020 | 93° | 65° | 79° | — | — |
| 2019 | 69° | 59° | 64° | — | — |
| 2018 | 86° | 59° | 73° | — | — |
| 2017 | 77° | 44° | 61° | — | — |
| 2016 | 68° | 52° | 60° | — | — |
| 2015 | 62° | 47° | 54° | 0.46" | — |
| 2014 | 75° | 54° | 64° | — | — |
| 2013 | 72° | 57° | 64° | — | — |
| 2012 | 90° | 53° | 71° | — | — |
| 2011 | 67° | 53° | 60° | — | — |
| 2010 | 82° | 55° | 69° | — | — |
| 2009 | 90° | 61° | 75° | — | — |
| 2008 | 73° | 54° | 63° | — | — |
| 2007 | 98° | 59° | 79° | — | — |
| 2006 | 73° | 54° | 63° | — | — |
| 2005 | 72° | 51° | 61° | — | — |
| 2004 | 88° | 58° | 73° | — | — |
| 2003 | 65° | 51° | 58° | — | — |
| 2002 | 74° | 55° | 64° | — | — |
| 2001 | 97° | 62° | 79° | — | — |
| 2000 | 70° | 57° | 63° | — | — |
| 1999 | 72° | 54° | 63° | — | — |
| 1984warmest | 102° | 56° | 79° | — | — |
| 1983 | 77° | 45° | 61° | — | — |
| 1982 | 74° | 54° | 64° | — | — |
| 1981 | 83° | 47° | 65° | — | — |
| 1980 | 63° | 54° | 58° | — | — |
| 1979 | 65° | 46° | 55° | — | — |
| 1978 | 87° | 50° | 69° | — | — |
| 1977coldest | 60° | 47° | 53° | 3.23" | — |
| 1976 | 76° | 48° | 62° | — | — |
| 1975 | 76° | 42° | 59° | — | — |
| 1974 | 74° | 52° | 63° | — | — |
| 1973 | 80° | 46° | 63° | — | — |
| 1972 | 72° | 49° | 60° | — | — |
| 1971 | 61° | 48° | 54° | — | — |
41 years of data from ONTARIO INTL AP