Kingshuk Mondal / CC BY 4.0
Ontario, CA Weather on August 26
August 26th in Ontario, CA typically brings hot summer weather, with average highs around 94°F and lows near 65°F — a 29°F daily swing. Over 42 years of records, the warmest August 26th was in 2010 (90°F average), while the coldest was 1973 (65°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 26th dates historically. Temperatures on this date have remained relatively stable over the past several decades.
What to Expect on August 26
Planning for August 26th in Ontario, CA? Stay hydrated and seek shade during peak afternoon hours.
August 26 Weather Records for Ontario
- •The all-time record high for August 26th in Ontario, CA is 106°F, set in 1981.
- •The coldest August 26th on record dropped to 51°F in 1975.
- •Temperatures have reached 90°F or higher on August 26th in 33 of the last 42 years.
Frequently Asked Questions
What was the warmest August 26 ever in Ontario?
The warmest August 26 in Ontario, CA reached 106°F in 1981. That is 12°F above the long-term average high of 94°F.
What was the coldest August 26 ever in Ontario?
The coldest August 26 in Ontario, CA dropped to 51°F in 1975. That is 14°F below the long-term average low of 65°F.
What is the average temperature on August 26 in Ontario?
On August 26, Ontario averages a high of 94°F and a low of 65°F based on 42 years of NOAA weather observations from ONTARIO INTL AP.
How many years of weather data are available for August 26 in Ontario?
We have 42 years of weather records for August 26 in Ontario, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
August 26 Weather History in Ontario
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 93°F | 69°F | 0" | -- |
| 2024 | 94°F | 64°F | 0" | -- |
| 2023 | 98°F | 64°F | 0" | -- |
| 2022 | 96°F | 67°F | 0" | -- |
| 2021 | 103°F | 72°F | 0" | -- |
| 2020 | 101°F | 72°F | 0" | -- |
| 2019 | 99°F | 72°F | 0" | -- |
| 2018 | 89°F | 65°F | 0" | -- |
| 2017 | 102°F | 64°F | 0" | -- |
| 2016 | 84°F | 61°F | 0" | -- |
| 2015 | 100°F | 75°F | 0" | -- |
| 2014 | 93°F | 65°F | 0" | -- |
| 2013 | 92°F | 74°F | 0" | -- |
| 2012 | 91°F | 62°F | 0" | -- |
| 2011 | 104°F | 73°F | 0" | -- |
| 2010 | 104°F | 75°F | 0" | -- |
| 2009 | 103°F | 66°F | 0" | -- |
| 2008 | 96°F | 68°F | 0" | -- |
| 2007 | 88°F | 67°F | 0" | -- |
| 2006 | 91°F | 59°F | 0" | -- |
| 2005 | 100°F | 71°F | 0" | -- |
| 2004 | 86°F | 61°F | 0" | -- |
| 2003 | 97°F | 70°F | 0" | -- |
| 2002 | 92°F | 62°F | 0" | -- |
| 2001 | 99°F | 65°F | 0" | -- |
| 2000 | 92°F | 65°F | 0" | -- |
| 1999 | 100°F | 71°F | 0" | -- |
| 1998 | 93°F | 64°F | 0" | -- |
| 1984 | 100°F | 63°F | 0" | -- |
| 1983 | 100°F | 57°F | 0" | -- |
| 1982 | 94°F | 66°F | 0" | -- |
| 1981 | 106°F | 71°F | 0" | -- |
| 1980 | 95°F | 57°F | 0" | -- |
| 1979 | 95°F | 58°F | 0" | -- |
| 1978 | 83°F | 52°F | 0" | -- |
| 1977 | 80°F | 59°F | 0" | -- |
| 1976 | 94°F | 59°F | 0" | -- |
| 1975 | 86°F | 51°F | 0" | -- |
| 1974 | 94°F | 58°F | 0" | -- |
| 1973 | 75°F | 56°F | 0" | -- |
| 1972 | 81°F | 62°F | 0.22" | -- |
| 1971 | 98°F | 57°F | 0" | -- |
Based on 42 years of data from NOAA station: ONTARIO INTL AP
Monthly Climate Averages
Historical temperature and precipitation averages for Ontario, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.