Weather on September 22
Rialto, CA
55 Years of Data
About This Date
September 22nd in Rialto, CA typically brings warm fall weather, with average highs around 88°F and lows near 61°F — a 27°F daily swing. Over 49 years of records, the warmest September 22nd was in 2002 (89°F average), while the coldest was 2007 (56°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 22nd dates historically.
Planning for September 22nd in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 86° | 64° | 75° | — | — |
| 2025 | 93° | 67° | 80° | — | — |
| 2017 | 69° | 50° | 60° | — | — |
| 2016 | 73° | 55° | 64° | — | — |
| 2015 | 84° | 66° | 75° | — | — |
| 2014 | 91° | 62° | 77° | — | — |
| 2013 | 76° | 55° | 65° | — | — |
| 2012 | 94° | 72° | 83° | — | — |
| 2011 | 98° | 66° | 82° | — | — |
| 2010 | 66° | 55° | 61° | — | — |
| 2009 | 96° | 77° | 87° | — | — |
| 2008 | 81° | 54° | 67° | — | — |
| 2007coldest | 59° | 53° | 56° | — | — |
| 2006 | 73° | 54° | 63° | — | — |
| 2005 | 95° | 64° | 80° | — | — |
| 2004 | 88° | 69° | 78° | — | — |
| 2003 | 105° | 74° | 89° | — | — |
| 2002warmest | 105° | 74° | 89° | — | — |
| 2001 | 96° | 64° | 80° | — | — |
| 2000 | 65° | 56° | 60° | — | — |
| 1999 | 89° | 67° | 78° | — | — |
| 1998 | 75° | 59° | 67° | — | — |
| 1997 | 97° | 68° | 82° | — | — |
| 1996 | 83° | 53° | 68° | — | — |
| 1995 | 91° | 68° | 80° | — | — |
| 1994 | 89° | 62° | 76° | — | — |
| 1993 | 80° | 49° | 64° | — | — |
| 1992 | 97° | 72° | 84° | — | — |
| 1991 | 96° | 65° | 80° | 0.07" | — |
| 1990 | 82° | 57° | 70° | — | — |
| 1989 | 93° | 60° | 77° | — | — |
| 1988 | 80° | 49° | 64° | — | — |
| 1987 | 91° | 62° | 77° | — | — |
| 1986 | 75° | 49° | 62° | — | — |
| 1985 | 95° | 56° | 75° | — | — |
| 1984 | 83° | 68° | 75° | — | — |
| 1983 | 88° | 70° | 79° | — | — |
| 1982 | 106° | 60° | 83° | — | — |
| 1981 | 93° | 59° | 76° | — | — |
| 1980 | 85° | 55° | 70° | — | — |
| 1979 | 98° | 61° | 79° | — | — |
| 1978 | 100° | 51° | 76° | — | — |
| 1977 | 85° | 52° | 68° | — | — |
| 1976 | 82° | 58° | 70° | — | — |
| 1975 | 104° | 64° | 84° | — | — |
| 1974 | 100° | 65° | 82° | — | — |
| 1973 | 80° | 60° | 70° | — | — |
| 1972 | 94° | 58° | 76° | — | — |
| 1971 | 92° | 59° | 75° | — | — |
Rialto, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Rialto, CA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Rialto, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Rialto, CA
Most pleasant months in Rialto, CA: January, February, March, April, May, October, November, December.
What to expect on September 22nd
This page shows what actually happened each year. For the odds — typical high and low, and how often it stays dry — see the climatological outlook for this date.
September 22nd outlook →