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Fontana, CA Weather on May 27
May 27th in Fontana, CA typically brings warm spring weather, with average highs around 81°F and lows near 55°F — a 26°F daily swing. Over 55 years of records, the warmest May 27th was in 2020 (80°F average), while the coldest was 1980 (58°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 5% of May 27th dates historically. Temperatures on this date have remained relatively stable over the past several decades.
What to Expect on May 27
Planning for May 27th in Fontana, CA? Stay hydrated and seek shade during peak afternoon hours.
May 27 Weather Records for Fontana
- •The all-time record high for May 27th in Fontana, CA is 99°F, set in 2000.
- •The coldest May 27th on record dropped to 44°F in 1978.
- •Temperatures have reached 90°F or higher on May 27th in 11 of the last 55 years.
- •Last year (1971), May 27th was 10°F cooler than the long-term average.
Frequently Asked Questions
What was the warmest May 27 ever in Fontana?
The warmest May 27 in Fontana, CA reached 99°F in 2000. That is 18°F above the long-term average high of 81°F.
What was the coldest May 27 ever in Fontana?
The coldest May 27 in Fontana, CA dropped to 44°F in 1978. That is 11°F below the long-term average low of 55°F.
What is the average temperature on May 27 in Fontana?
On May 27, Fontana averages a high of 81°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 27 in Fontana?
We have 55 years of weather records for May 27 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 27 Weather History in Fontana
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 84°F | 60°F | 0" | -- |
| 2024 | 80°F | 53°F | 0" | -- |
| 2023 | 74°F | 56°F | 0" | -- |
| 2022 | 80°F | 55°F | 0" | -- |
| 2021 | 82°F | 58°F | 0" | -- |
| 2020 | 95°F | 64°F | 0" | -- |
| 2019 | 68°F | 51°F | 0" | -- |
| 2018 | 78°F | 53°F | 0" | -- |
| 2017 | 79°F | 56°F | 0" | -- |
| 2016 | 82°F | 54°F | 0" | -- |
| 2015 | 79°F | 58°F | 0" | -- |
| 2014 | 92°F | 62°F | 0" | -- |
| 2013 | 82°F | 57°F | 0" | -- |
| 2012 | 80°F | 48°F | 0" | -- |
| 2011 | 81°F | 54°F | 0" | -- |
| 2010 | 71°F | 56°F | 0" | -- |
| 2009 | 85°F | 57°F | 0" | -- |
| 2008 | 73°F | 49°F | 0" | -- |
| 2007 | 82°F | 55°F | 0" | -- |
| 2006 | 70°F | 56°F | 0" | -- |
| 2005 | 80°F | 56°F | 0" | -- |
| 2004 | 76°F | 53°F | 0" | -- |
| 2003 | 97°F | 59°F | 0" | -- |
| 2002 | 77°F | 54°F | 0" | -- |
| 2001 | 68°F | 59°F | 0.03" | -- |
| 2000 | 99°F | 59°F | 0" | -- |
| 1999 | 85°F | 57°F | 0" | -- |
| 1998 | 73°F | 46°F | 0" | -- |
| 1997 | 96°F | 60°F | 0" | -- |
| 1996 | 74°F | 53°F | 0" | -- |
| 1995 | 77°F | 54°F | 0" | -- |
| 1994 | 83°F | 53°F | 0" | -- |
| 1993 | 82°F | 54°F | 0" | -- |
| 1992 | 83°F | 62°F | 0" | -- |
| 1991 | 73°F | 55°F | 0" | -- |
| 1990 | 77°F | 53°F | 0" | -- |
| 1989 | 84°F | 55°F | 0" | -- |
| 1988 | 81°F | 56°F | 0" | -- |
| 1987 | 69°F | 55°F | 0" | -- |
| 1986 | 91°F | 54°F | 0" | -- |
| 1985 | 79°F | 51°F | 0" | -- |
| 1984 | 98°F | 55°F | 0" | -- |
| 1983 | 96°F | 58°F | 0" | -- |
| 1982 | 65°F | 57°F | 0" | -- |
| 1981 | 77°F | 58°F | 0.08" | -- |
| 1980 | 67°F | 50°F | 0" | -- |
| 1979 | 75°F | 58°F | 0" | -- |
| 1978 | 75°F | 44°F | 0" | -- |
| 1977 | 82°F | 50°F | 0" | -- |
| 1976 | 87°F | 55°F | 0" | -- |
| 1975 | 78°F | 53°F | 0" | -- |
| 1974 | 97°F | 61°F | 0" | -- |
| 1973 | 92°F | 59°F | 0" | -- |
| 1972 | 90°F | 54°F | 0" | -- |
| 1971 | 71°F | 51°F | 0.15" | -- |
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.