Weather on July 17
Ontario, CA
55 Years of Data
About This Date
July 17th in Ontario, CA typically brings hot summer weather, with average highs around 93°F and lows near 63°F — a 30°F daily swing. Over 42 years of records, the warmest July 17th was in 2010 (87°F average), while the coldest was 1973 (68°F) — a 19°F range across recorded history. This date has historically been dry, with little recorded precipitation. 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 July 17th in Ontario, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 92° | 63° | 77° | — | — |
| 2024 | 91° | 66° | 79° | — | — |
| 2023 | 100° | 72° | 86° | — | — |
| 2022 | 101° | 70° | 85° | — | — |
| 2021 | 97° | 67° | 82° | — | — |
| 2020 | 92° | 63° | 77° | — | — |
| 2019 | 95° | 66° | 81° | — | — |
| 2018 | 96° | 67° | 81° | — | — |
| 2017 | 94° | 67° | 80° | — | — |
| 2016 | 95° | 62° | 79° | — | — |
| 2015 | 97° | 62° | 79° | — | — |
| 2014 | 84° | 63° | 73° | — | — |
| 2013 | 96° | 63° | 79° | — | — |
| 2012 | 85° | 59° | 72° | — | — |
| 2011 | 90° | 58° | 74° | — | — |
| 2010warmest | 101° | 74° | 87° | — | — |
| 2009 | 98° | 70° | 84° | — | — |
| 2008 | 93° | 70° | 81° | — | — |
| 2007 | 90° | 62° | 76° | — | — |
| 2006 | 101° | 71° | 86° | — | — |
| 2005 | 96° | 65° | 80° | — | — |
| 2004 | 97° | 69° | 83° | — | — |
| 2003 | 95° | 69° | 82° | — | — |
| 2002 | 89° | 63° | 76° | — | — |
| 2001 | 85° | 57° | 71° | — | — |
| 2000 | 92° | 58° | 75° | — | — |
| 1999 | 92° | 61° | 76° | — | — |
| 1998 | 102° | 69° | 86° | — | — |
| 1984 | 98° | 68° | 83° | — | — |
| 1983 | 87° | 54° | 70° | — | — |
| 1982 | 90° | 53° | 71° | — | — |
| 1981 | 93° | 61° | 77° | — | — |
| 1980 | 98° | 60° | 79° | — | — |
| 1979 | 101° | 68° | 84° | — | — |
| 1978 | 95° | 61° | 78° | — | — |
| 1977 | 94° | 64° | 79° | — | — |
| 1976 | 82° | 55° | 69° | — | — |
| 1975 | 83° | 59° | 71° | — | — |
| 1974 | 95° | 58° | 76° | — | — |
| 1973coldest | 84° | 52° | 68° | — | — |
| 1972 | 86° | 56° | 71° | — | — |
| 1971 | 93° | 62° | 78° | — | — |
Ontario, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Ontario, CA Monthly Precipitation
Average rainfall per month, in inches.
Ontario, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Ontario, CA
Ontario, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.