Weather on May 29
Ontario, CA
55 Years of Data
Avg High
81°F
Avg Low
56°F
Warmest
1984
87°F avg
Coldest
1971
54°F avg
About This Date
May 29th in Ontario, CA typically brings warm spring weather, with average highs around 81°F and lows near 56°F — a 25°F daily swing. Over 42 years of records, the warmest May 29th was in 1984 (87°F average), while the coldest was 1971 (54°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 2% of May 29th dates historically. The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
Planning for May 29th in Ontario, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 61° | 71° | — | — |
| 2024 | 79° | 56° | 67° | — | — |
| 2023 | 71° | 58° | 64° | — | — |
| 2022 | 74° | 56° | 65° | — | — |
| 2021 | 79° | 59° | 69° | — | — |
| 2020 | 80° | 61° | 70° | — | — |
| 2019 | 86° | 58° | 72° | — | — |
| 2018 | 84° | 57° | 71° | — | — |
| 2017 | 83° | 56° | 69° | — | — |
| 2016 | 75° | 57° | 66° | — | — |
| 2015 | 89° | 56° | 72° | — | — |
| 2014 | 88° | 59° | 73° | — | — |
| 2013 | 85° | 58° | 71° | — | — |
| 2012 | 88° | 58° | 73° | — | — |
| 2011 | 69° | 53° | 61° | — | — |
| 2010 | 89° | 49° | 69° | — | — |
| 2009 | 74° | 60° | 67° | — | — |
| 2008 | 78° | 53° | 66° | — | — |
| 2007 | 79° | 55° | 67° | — | — |
| 2006 | 83° | 54° | 68° | — | — |
| 2005 | 73° | 60° | 67° | — | — |
| 2004 | 78° | 57° | 68° | — | — |
| 2003 | 87° | 62° | 75° | — | — |
| 2002 | 99° | 57° | 78° | — | — |
| 2001 | 86° | 55° | 71° | — | — |
| 2000 | 90° | 62° | 76° | — | — |
| 1999 | 76° | 55° | 65° | — | — |
| 1998 | 71° | 54° | 62° | — | — |
| 1984warmest | 112° | 63° | 87° | — | — |
| 1983 | 88° | 53° | 70° | — | — |
| 1982 | 65° | 54° | 59° | — | — |
| 1981 | 76° | 59° | 67° | — | — |
| 1980 | 75° | 42° | 59° | — | — |
| 1979 | 73° | 54° | 63° | — | — |
| 1978 | 100° | 59° | 80° | — | — |
| 1977 | 76° | 49° | 62° | — | — |
| 1976 | 63° | 52° | 57° | — | — |
| 1975 | 88° | 50° | 69° | — | — |
| 1974 | 77° | 55° | 66° | — | — |
| 1973 | 92° | 60° | 76° | — | — |
| 1972 | 95° | 48° | 72° | — | — |
| 1971coldest | 60° | 48° | 54° | 0.15" | — |
42 years of data from ONTARIO INTL AP