Michael D Beckwith / CC BY 2.0
Fontana, CA Weather on August 25
August 25th in Fontana, CA typically brings hot summer weather, with average highs around 95°F and lows near 64°F — a 31°F daily swing. Over 55 years of records, the warmest August 25th was in 2010 (91°F average), while the coldest was 1978 (68°F) — a 23°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
What to Expect on August 25
Planning for August 25th in Fontana, CA? Stay hydrated and seek shade during peak afternoon hours.
August 25 Weather Records for Fontana
- •The all-time record high for August 25th in Fontana, CA is 110°F, set in 1985.
- •The coldest August 25th on record dropped to 48°F in 1978.
- •Temperatures have reached 90°F or higher on August 25th in 42 of the last 55 years.
Frequently Asked Questions
What was the warmest August 25 ever in Fontana?
The warmest August 25 in Fontana, CA reached 110°F in 1985. That is 15°F above the long-term average high of 95°F.
What was the coldest August 25 ever in Fontana?
The coldest August 25 in Fontana, CA dropped to 48°F in 1978. That is 16°F below the long-term average low of 64°F.
What is the average temperature on August 25 in Fontana?
On August 25, Fontana averages a high of 95°F and a low of 64°F based on 55 years of NOAA weather observations from FONTANA KAISER.
How many years of weather data are available for August 25 in Fontana?
We have 55 years of weather records for August 25 in Fontana, 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 25 Weather History in Fontana
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 98°F | 70°F | 0" | -- |
| 2024 | 88°F | 61°F | 0" | -- |
| 2023 | 94°F | 63°F | 0" | -- |
| 2022 | 95°F | 70°F | 0" | -- |
| 2021 | 100°F | 67°F | 0" | -- |
| 2020 | 99°F | 70°F | 0" | -- |
| 2019 | 98°F | 67°F | 0" | -- |
| 2018 | 89°F | 64°F | 0" | -- |
| 2017 | 88°F | 63°F | 0" | -- |
| 2016 | 90°F | 63°F | 0" | -- |
| 2015 | 93°F | 72°F | 0" | -- |
| 2014 | 88°F | 65°F | 0" | -- |
| 2013 | 97°F | 67°F | 0" | -- |
| 2012 | 87°F | 64°F | 0" | -- |
| 2011 | 100°F | 67°F | 0" | -- |
| 2010 | 108°F | 74°F | 0" | -- |
| 2009 | 99°F | 67°F | 0" | -- |
| 2008 | 100°F | 71°F | 0" | -- |
| 2007 | 91°F | 64°F | 0" | -- |
| 2006 | 92°F | 64°F | 0" | -- |
| 2005 | 100°F | 68°F | 0" | -- |
| 2004 | 87°F | 60°F | 0" | -- |
| 2003 | 96°F | 69°F | 0" | -- |
| 2002 | 94°F | 61°F | 0" | -- |
| 2001 | 97°F | 64°F | 0" | -- |
| 2000 | 92°F | 69°F | 0" | -- |
| 1999 | 105°F | 68°F | 0" | -- |
| 1998 | 93°F | 65°F | 0" | -- |
| 1997 | 98°F | 65°F | 0" | -- |
| 1996 | 103°F | 66°F | 0" | -- |
| 1995 | 100°F | 63°F | 0" | -- |
| 1994 | 101°F | 61°F | 0" | -- |
| 1993 | 99°F | 60°F | 0" | -- |
| 1992 | 92°F | 64°F | 0" | -- |
| 1991 | 95°F | 65°F | 0" | -- |
| 1990 | 85°F | 64°F | 0" | -- |
| 1989 | 82°F | 61°F | 0" | -- |
| 1988 | 100°F | 73°F | 0" | -- |
| 1987 | 86°F | 56°F | -- | -- |
| 1986 | 100°F | 62°F | 0" | -- |
| 1985 | 110°F | 66°F | 0" | -- |
| 1984 | 94°F | 58°F | 0" | -- |
| 1983 | 92°F | 57°F | 0" | -- |
| 1982 | 94°F | 66°F | 0" | -- |
| 1981 | 107°F | 68°F | 0" | -- |
| 1980 | 92°F | 60°F | 0" | -- |
| 1979 | 94°F | 62°F | 0" | -- |
| 1978 | 88°F | 48°F | 0" | -- |
| 1977 | 87°F | 60°F | 0" | -- |
| 1976 | 98°F | 62°F | 0" | -- |
| 1975 | 93°F | 62°F | 0" | -- |
| 1974 | 96°F | 61°F | 0" | -- |
| 1973 | 86°F | 59°F | 0" | -- |
| 1972 | 86°F | 66°F | 0" | -- |
| 1971 | 99°F | 64°F | 0" | -- |
Based on 55 years of data from NOAA station: FONTANA KAISER
Monthly Climate Averages
Historical temperature and precipitation averages for Fontana, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.