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Rialto, CA Weather on May 25
May 25th in Rialto, CA typically brings pleasant spring weather, with average highs around 77°F and lows near 53°F. Over 48 years of records, the warmest May 25th was in 1974 (81°F average), while the coldest was 2008 (52°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 4% of May 25th dates historically.
What to Expect on May 25
Planning for May 25th in Rialto, CA? Great weather for outdoor activities.
May 25 Weather Records for Rialto
- •The all-time record high for May 25th in Rialto, CA is 104°F, set in 1974.
- •The coldest May 25th on record dropped to 44°F in 2008.
- •Temperatures have reached 90°F or higher on May 25th in 7 of the last 48 years.
- •Last year (1971), May 25th was 15°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest May 25 ever in Rialto?
The warmest May 25 in Rialto, CA reached 104°F in 1974. That is 27°F above the long-term average high of 77°F.
What was the coldest May 25 ever in Rialto?
The coldest May 25 in Rialto, CA dropped to 44°F in 2008. That is 9°F below the long-term average low of 53°F.
What is the average temperature on May 25 in Rialto?
On May 25, Rialto averages a high of 77°F and a low of 53°F based on 48 years of NOAA weather observations from DEVORE CALIFORNIA.
How many years of weather data are available for May 25 in Rialto?
We have 48 years of weather records for May 25 in Rialto, 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 Rialto
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 79°F | 57°F | -- | -- |
| 2017 | 68°F | 54°F | -- | -- |
| 2016 | 65°F | 51°F | -- | -- |
| 2015 | 69°F | 49°F | -- | -- |
| 2014 | 84°F | 55°F | -- | -- |
| 2013 | 73°F | 51°F | -- | -- |
| 2012 | 65°F | 47°F | -- | -- |
| 2011 | 76°F | 51°F | -- | -- |
| 2010 | 70°F | 45°F | -- | -- |
| 2009 | 73°F | 52°F | -- | -- |
| 2008 | 59°F | 44°F | -- | -- |
| 2007 | 84°F | 51°F | -- | -- |
| 2006 | 82°F | 59°F | -- | -- |
| 2005 | 90°F | 54°F | -- | -- |
| 2004 | 68°F | 50°F | -- | -- |
| 2003 | 70°F | 51°F | -- | -- |
| 2002 | 79°F | 50°F | -- | -- |
| 2001 | 91°F | 52°F | -- | -- |
| 2000 | 59°F | 56°F | -- | -- |
| 1999 | 84°F | 54°F | -- | -- |
| 1998 | 63°F | 53°F | -- | -- |
| 1997 | 77°F | 56°F | -- | -- |
| 1996 | 69°F | 46°F | -- | -- |
| 1995 | 62°F | 49°F | -- | -- |
| 1994 | 64°F | 54°F | 0.05" | -- |
| 1993 | 75°F | 52°F | -- | -- |
| 1992 | 63°F | 56°F | -- | -- |
| 1991 | 78°F | 55°F | -- | -- |
| 1990 | 80°F | 50°F | 0" | -- |
| 1989 | 77°F | 52°F | 0" | -- |
| 1988 | 84°F | 54°F | 0" | -- |
| 1987 | 67°F | 55°F | 0" | -- |
| 1986 | 99°F | 58°F | 0" | -- |
| 1985 | 79°F | 58°F | 0" | -- |
| 1984 | 94°F | 58°F | 0" | -- |
| 1983 | 91°F | 58°F | 0" | -- |
| 1982 | 83°F | 61°F | 0" | -- |
| 1981 | 85°F | 61°F | 0" | -- |
| 1980 | 73°F | 44°F | 0" | -- |
| 1979 | 87°F | 58°F | 0" | -- |
| 1978 | 75°F | 46°F | 0" | -- |
| 1977 | 69°F | 49°F | 0.03" | -- |
| 1976 | 76°F | 57°F | 0" | -- |
| 1975 | 87°F | 53°F | 0" | -- |
| 1974 | 104°F | 57°F | 0" | -- |
| 1973 | 75°F | 55°F | 0" | -- |
| 1972 | 73°F | 54°F | 0" | -- |
| 1971 | 92°F | 53°F | 0" | -- |
Based on 48 years of data from NOAA station: DEVORE CALIFORNIA
Monthly Climate Averages
Historical temperature and precipitation averages for Rialto, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.