Weather on August 25
Fontana, CA
55 Years of Data
Avg High
95°F
Avg Low
64°F
Warmest
2010
91°F avg
Coldest
1978
68°F avg
About This Date
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.
The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
Planning for August 25th in Fontana, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 98° | 70° | 84° | — | — |
| 2024 | 88° | 61° | 74° | — | — |
| 2023 | 94° | 63° | 78° | — | — |
| 2022 | 95° | 70° | 82° | — | — |
| 2021 | 100° | 67° | 83° | — | — |
| 2020 | 99° | 70° | 84° | — | — |
| 2019 | 98° | 67° | 82° | — | — |
| 2018 | 89° | 64° | 77° | — | — |
| 2017 | 88° | 63° | 75° | — | — |
| 2016 | 90° | 63° | 76° | — | — |
| 2015 | 93° | 72° | 82° | — | — |
| 2014 | 88° | 65° | 76° | — | — |
| 2013 | 97° | 67° | 82° | — | — |
| 2012 | 87° | 64° | 76° | — | — |
| 2011 | 100° | 67° | 83° | — | — |
| 2010warmest | 108° | 74° | 91° | — | — |
| 2009 | 99° | 67° | 83° | — | — |
| 2008 | 100° | 71° | 86° | — | — |
| 2007 | 91° | 64° | 78° | — | — |
| 2006 | 92° | 64° | 78° | — | — |
| 2005 | 100° | 68° | 84° | — | — |
| 2004 | 87° | 60° | 74° | — | — |
| 2003 | 96° | 69° | 83° | — | — |
| 2002 | 94° | 61° | 77° | — | — |
| 2001 | 97° | 64° | 80° | — | — |
| 2000 | 92° | 69° | 80° | — | — |
| 1999 | 105° | 68° | 87° | — | — |
| 1998 | 93° | 65° | 79° | — | — |
| 1997 | 98° | 65° | 81° | — | — |
| 1996 | 103° | 66° | 84° | — | — |
| 1995 | 100° | 63° | 81° | — | — |
| 1994 | 101° | 61° | 81° | — | — |
| 1993 | 99° | 60° | 79° | — | — |
| 1992 | 92° | 64° | 78° | — | — |
| 1991 | 95° | 65° | 80° | — | — |
| 1990 | 85° | 64° | 74° | — | — |
| 1989 | 82° | 61° | 71° | — | — |
| 1988 | 100° | 73° | 87° | — | — |
| 1987 | 86° | 56° | 71° | — | — |
| 1986 | 100° | 62° | 81° | — | — |
| 1985 | 110° | 66° | 88° | — | — |
| 1984 | 94° | 58° | 76° | — | — |
| 1983 | 92° | 57° | 74° | — | — |
| 1982 | 94° | 66° | 80° | — | — |
| 1981 | 107° | 68° | 88° | — | — |
| 1980 | 92° | 60° | 76° | — | — |
| 1979 | 94° | 62° | 78° | — | — |
| 1978coldest | 88° | 48° | 68° | — | — |
| 1977 | 87° | 60° | 74° | — | — |
| 1976 | 98° | 62° | 80° | — | — |
| 1975 | 93° | 62° | 78° | — | — |
| 1974 | 96° | 61° | 78° | — | — |
| 1973 | 86° | 59° | 73° | — | — |
| 1972 | 86° | 66° | 76° | — | — |
| 1971 | 99° | 64° | 81° | — | — |
55 years of data from FONTANA KAISER