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Fullerton, CA Weather on August 25
August 25th in Fullerton, CA typically brings warm summer weather, with average highs around 88°F and lows near 63°F — a 25°F daily swing. Over 55 years of records, the warmest August 25th was in 1981 (84°F average), while the coldest was 1978 (67°F) — a 17°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
What to Expect on August 25
Planning for August 25th in Fullerton, CA? Stay hydrated and seek shade during peak afternoon hours.
August 25 Weather Records for Fullerton
- •The all-time record high for August 25th in Fullerton, CA is 106°F, set in 1981.
- •The coldest August 25th on record dropped to 50°F in 1978.
- •Temperatures have reached 90°F or higher on August 25th in 18 of the last 55 years.
Frequently Asked Questions
What was the warmest August 25 ever in Fullerton?
The warmest August 25 in Fullerton, CA reached 106°F in 1981. That is 18°F above the long-term average high of 88°F.
What was the coldest August 25 ever in Fullerton?
The coldest August 25 in Fullerton, CA dropped to 50°F in 1978. That is 13°F below the long-term average low of 63°F.
What is the average temperature on August 25 in Fullerton?
On August 25, Fullerton averages a high of 88°F and a low of 63°F based on 55 years of NOAA weather observations from ANAHEIM.
How many years of weather data are available for August 25 in Fullerton?
We have 55 years of weather records for August 25 in Fullerton, 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 Fullerton
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 87°F | 68°F | 0" | -- |
| 2024 | 84°F | 62°F | 0" | -- |
| 2023 | 88°F | 64°F | 0" | -- |
| 2022 | 92°F | 69°F | 0" | -- |
| 2021 | 94°F | 64°F | 0" | -- |
| 2020 | 94°F | 69°F | 0" | -- |
| 2019 | 95°F | 66°F | 0" | -- |
| 2018 | 85°F | 69°F | 0" | -- |
| 2017 | 81°F | 67°F | 0" | -- |
| 2016 | 86°F | 66°F | 0" | -- |
| 2015 | 89°F | 71°F | 0" | -- |
| 2014 | 84°F | 65°F | 0" | -- |
| 2013 | 90°F | 60°F | 0" | -- |
| 2012 | 82°F | 66°F | 0" | -- |
| 2011 | 94°F | 65°F | 0" | -- |
| 2010 | 98°F | 69°F | 0" | -- |
| 2009 | 95°F | 63°F | 0" | -- |
| 2008 | 92°F | 67°F | 0" | -- |
| 2007 | 86°F | 67°F | 0" | -- |
| 2006 | 88°F | 66°F | 0" | -- |
| 2005 | 99°F | 66°F | 0" | -- |
| 2004 | 84°F | 62°F | 0" | -- |
| 2003 | 92°F | 68°F | 0" | -- |
| 2002 | 86°F | 54°F | 0" | -- |
| 2001 | 87°F | 67°F | 0" | -- |
| 2000 | 86°F | 67°F | 0" | -- |
| 1999 | 92°F | 64°F | 0" | -- |
| 1998 | 84°F | 65°F | 0" | -- |
| 1997 | 88°F | 64°F | 0" | -- |
| 1996 | 92°F | 63°F | 0" | -- |
| 1995 | 89°F | 60°F | 0" | -- |
| 1994 | 88°F | 61°F | 0" | -- |
| 1993 | 90°F | 63°F | 0" | -- |
| 1992 | 84°F | 62°F | 0" | -- |
| 1991 | 82°F | 63°F | 0" | -- |
| 1990 | 79°F | 63°F | 0" | -- |
| 1989 | 78°F | 63°F | 0" | -- |
| 1988 | 89°F | 68°F | 0" | -- |
| 1987 | 77°F | 62°F | 0" | -- |
| 1986 | 86°F | 61°F | 0" | -- |
| 1985 | 99°F | 67°F | 0" | -- |
| 1984 | 85°F | 68°F | 0" | -- |
| 1983 | 83°F | 62°F | 0" | -- |
| 1982 | 89°F | 65°F | 0" | -- |
| 1981 | 106°F | 62°F | 0" | -- |
| 1980 | 89°F | 60°F | 0" | -- |
| 1979 | 89°F | 57°F | 0" | -- |
| 1978 | 84°F | 50°F | 0" | -- |
| 1977 | 83°F | 58°F | 0" | -- |
| 1976 | 89°F | 57°F | 0" | -- |
| 1975 | 86°F | 52°F | 0" | -- |
| 1974 | 90°F | 56°F | 0" | -- |
| 1973 | 80°F | 55°F | 0" | -- |
| 1972 | 81°F | 64°F | 0" | -- |
| 1971 | 90°F | 56°F | 0" | -- |
Based on 55 years of data from NOAA station: ANAHEIM
Monthly Climate Averages
Historical temperature and precipitation averages for Fullerton, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.