Dietmar Rabich / CC BY-SA 4.0
Rialto, CA Weather on October 9
October 9th in Rialto, CA typically brings warm fall weather, with average highs around 84°F and lows near 57°F — a 27°F daily swing. Over 48 years of records, the warmest October 9th was in 1991 (85°F average), while the coldest was 2013 (49°F) — a 36°F range across recorded history. This date has historically been dry, with little recorded precipitation.
What to Expect on October 9
Planning for October 9th in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
October 9 Weather Records for Rialto
- •The all-time record high for October 9th in Rialto, CA is 103°F, set in 1971.
- •The coldest October 9th on record dropped to 45°F in 2013.
- •Temperatures have reached 90°F or higher on October 9th in 13 of the last 48 years.
- •Last year (1971), October 9th was 19°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest October 9 ever in Rialto?
The warmest October 9 in Rialto, CA reached 103°F in 1971. That is 19°F above the long-term average high of 84°F.
What was the coldest October 9 ever in Rialto?
The coldest October 9 in Rialto, CA dropped to 45°F in 2013. That is 12°F below the long-term average low of 57°F.
What is the average temperature on October 9 in Rialto?
On October 9, Rialto averages a high of 84°F and a low of 57°F based on 48 years of NOAA weather observations from DEVORE CALIFORNIA.
How many years of weather data are available for October 9 in Rialto?
We have 48 years of weather records for October 9 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.
October 9 Weather History in Rialto
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 81°F | 59°F | -- | -- |
| 2017 | 75°F | 63°F | -- | -- |
| 2016 | 91°F | 66°F | -- | -- |
| 2015 | 96°F | 73°F | -- | -- |
| 2014 | 79°F | 58°F | -- | -- |
| 2013 | 54°F | 45°F | -- | -- |
| 2012 | 74°F | 57°F | -- | -- |
| 2011 | 79°F | 57°F | -- | -- |
| 2010 | 86°F | 62°F | -- | -- |
| 2009 | 74°F | 51°F | -- | -- |
| 2008 | 84°F | 59°F | -- | -- |
| 2007 | 81°F | 56°F | -- | -- |
| 2006 | 65°F | 48°F | -- | -- |
| 2005 | 85°F | 47°F | -- | -- |
| 2004 | 86°F | 58°F | -- | -- |
| 2003 | 94°F | 58°F | -- | -- |
| 2002 | 91°F | 62°F | -- | -- |
| 2001 | 76°F | 52°F | -- | -- |
| 2000 | 79°F | 55°F | -- | -- |
| 1999 | 101°F | 68°F | -- | -- |
| 1998 | 83°F | 54°F | -- | -- |
| 1997 | 82°F | 53°F | -- | -- |
| 1996 | 99°F | 69°F | -- | -- |
| 1995 | 86°F | 48°F | -- | -- |
| 1994 | 92°F | 51°F | 0" | -- |
| 1993 | 79°F | 46°F | -- | -- |
| 1992 | 88°F | 63°F | -- | -- |
| 1991 | 98°F | 71°F | -- | -- |
| 1990 | 89°F | 48°F | 0" | -- |
| 1989 | 87°F | 53°F | 0" | -- |
| 1988 | 95°F | 61°F | 0" | -- |
| 1987 | 78°F | 59°F | 0" | -- |
| 1986 | 81°F | 57°F | 0" | -- |
| 1985 | 70°F | 53°F | 0" | -- |
| 1984 | 86°F | 55°F | 0" | -- |
| 1983 | 78°F | 63°F | 0" | -- |
| 1982 | 82°F | 55°F | 0" | -- |
| 1981 | 78°F | 59°F | 0" | -- |
| 1980 | 91°F | 57°F | 0" | -- |
| 1979 | 85°F | 59°F | 0" | -- |
| 1978 | 94°F | 58°F | 0" | -- |
| 1977 | 84°F | 57°F | 0" | -- |
| 1976 | 99°F | 54°F | 0" | -- |
| 1975 | 78°F | 48°F | 0" | -- |
| 1974 | 77°F | 51°F | 0" | -- |
| 1973 | 74°F | 50°F | 0" | -- |
| 1972 | 69°F | 57°F | 0" | -- |
| 1971 | 103°F | 56°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.