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Fontana, CA Weather on May 25
May 25th in Fontana, CA typically brings pleasant spring weather, with average highs around 79°F and lows near 55°F. Over 55 years of records, the warmest May 25th was in 1974 (85°F average), while the coldest was 1980 (55°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 2% of May 25th dates historically. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
What to Expect on May 25
Planning for May 25th in Fontana, CA? Great weather for outdoor activities.
May 25 Weather Records for Fontana
- •The all-time record high for May 25th in Fontana, CA is 109°F, set in 1974.
- •The coldest May 25th on record dropped to 40°F in 1980.
- •Temperatures have reached 90°F or higher on May 25th in 5 of the last 55 years.
- •Last year (1971), May 25th was 10°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest May 25 ever in Fontana?
The warmest May 25 in Fontana, CA reached 109°F in 1974. That is 30°F above the long-term average high of 79°F.
What was the coldest May 25 ever in Fontana?
The coldest May 25 in Fontana, CA dropped to 40°F in 1980. That is 15°F below the long-term average low of 55°F.
What is the average temperature on May 25 in Fontana?
On May 25, Fontana averages a high of 79°F and a low of 55°F based on 55 years of NOAA weather observations from FONTANA KAISER.
How many years of weather data are available for May 25 in Fontana?
We have 55 years of weather records for May 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.
May 25 Weather History in Fontana
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 78°F | 58°F | 0" | -- |
| 2024 | 71°F | 54°F | 0" | -- |
| 2023 | 71°F | 56°F | 0" | -- |
| 2022 | 86°F | 57°F | 0" | -- |
| 2021 | 92°F | 64°F | 0" | -- |
| 2020 | 92°F | 56°F | 0" | -- |
| 2019 | 77°F | 55°F | 0" | -- |
| 2018 | 72°F | 55°F | 0" | -- |
| 2017 | 72°F | 56°F | 0" | -- |
| 2016 | 70°F | 54°F | 0" | -- |
| 2015 | 73°F | 53°F | 0" | -- |
| 2014 | 86°F | 60°F | 0" | -- |
| 2013 | 78°F | 56°F | 0" | -- |
| 2012 | 71°F | 53°F | 0" | -- |
| 2011 | 80°F | 54°F | 0" | -- |
| 2010 | 75°F | 48°F | 0" | -- |
| 2009 | 77°F | 58°F | 0" | -- |
| 2008 | 66°F | 49°F | 0" | -- |
| 2007 | 84°F | 57°F | 0" | -- |
| 2006 | 88°F | 60°F | 0" | -- |
| 2005 | 88°F | 58°F | 0" | -- |
| 2004 | 71°F | 57°F | 0" | -- |
| 2003 | 71°F | 56°F | 0" | -- |
| 2002 | 77°F | 53°F | 0" | -- |
| 2001 | 85°F | 60°F | 0" | -- |
| 2000 | 65°F | 58°F | 0" | -- |
| 1999 | 81°F | 54°F | 0" | -- |
| 1998 | 67°F | 58°F | 0" | -- |
| 1997 | 81°F | 59°F | 0" | -- |
| 1996 | 75°F | 50°F | 0" | -- |
| 1995 | 68°F | 55°F | 0" | -- |
| 1994 | 68°F | 56°F | 0.03" | -- |
| 1993 | 83°F | 56°F | 0" | -- |
| 1992 | 80°F | 62°F | 0" | -- |
| 1991 | 85°F | 54°F | 0" | -- |
| 1990 | 84°F | 52°F | 0" | -- |
| 1989 | 82°F | 52°F | 0" | -- |
| 1988 | 85°F | 56°F | 0" | -- |
| 1987 | 71°F | 56°F | 0" | -- |
| 1986 | 99°F | 55°F | 0" | -- |
| 1985 | 84°F | 55°F | 0" | -- |
| 1984 | 92°F | 54°F | 0" | -- |
| 1983 | 86°F | 57°F | 0" | -- |
| 1982 | 79°F | 59°F | 0" | -- |
| 1981 | 82°F | 59°F | 0" | -- |
| 1980 | 70°F | 40°F | 0" | -- |
| 1979 | 86°F | 54°F | 0" | -- |
| 1978 | 73°F | 41°F | 0" | -- |
| 1977 | 68°F | 50°F | 0" | -- |
| 1976 | 76°F | 57°F | 0" | -- |
| 1975 | 81°F | 54°F | 0" | -- |
| 1974 | 109°F | 60°F | 0" | -- |
| 1973 | 75°F | 53°F | 0" | -- |
| 1972 | 73°F | 57°F | 0" | -- |
| 1971 | 89°F | 58°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.