Weather on August 17
Rialto, CA
55 Years of Data
About This Date
August 17th in Rialto, CA typically brings hot summer weather, with average highs around 93°F and lows near 64°F — a 29°F daily swing. Over 48 years of records, the warmest August 17th was in 1992 (88°F average), while the coldest was 1976 (69°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 17th dates historically, with the wettest August 17th recording 6.35" of rain.
Planning for August 17th in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 63° | 77° | — | — |
| 2017 | 85° | 61° | 73° | — | — |
| 2016 | 99° | 71° | 85° | — | — |
| 2015 | 93° | 68° | 81° | — | — |
| 2014 | 95° | 69° | 82° | — | — |
| 2013 | 96° | 71° | 84° | — | — |
| 2012 | 96° | 78° | 87° | — | — |
| 2011 | 96° | 67° | 81° | — | — |
| 2010 | 97° | 72° | 84° | — | — |
| 2009 | 89° | 59° | 74° | — | — |
| 2008 | 89° | 62° | 76° | — | — |
| 2007 | 98° | 74° | 86° | — | — |
| 2006 | 89° | 57° | 73° | — | — |
| 2005 | 89° | 59° | 74° | — | — |
| 2004 | 95° | 63° | 79° | — | — |
| 2003 | 103° | 71° | 87° | — | — |
| 2002 | 90° | 58° | 74° | — | — |
| 2001 | 102° | 73° | 88° | — | — |
| 2000 | 97° | 69° | 83° | — | — |
| 1999 | 101° | 68° | 84° | — | — |
| 1998 | 88° | 60° | 74° | — | — |
| 1997 | 90° | 59° | 74° | — | — |
| 1996 | 94° | 64° | 79° | — | — |
| 1995 | 88° | 58° | 73° | — | — |
| 1994 | 95° | 71° | 83° | — | — |
| 1993 | 91° | 57° | 74° | — | — |
| 1992warmest | 101° | 75° | 88° | — | — |
| 1991 | 85° | 61° | 73° | — | — |
| 1990 | 89° | 60° | 75° | — | — |
| 1989 | 87° | 58° | 72° | — | — |
| 1988 | 90° | 59° | 74° | — | — |
| 1987 | 85° | 57° | 71° | — | — |
| 1986 | 103° | 60° | 81° | — | — |
| 1985 | 86° | 62° | 74° | — | — |
| 1984 | 100° | 71° | 86° | — | — |
| 1983 | 92° | 67° | 79° | 6.35" | — |
| 1982 | 96° | 63° | 79° | — | — |
| 1981 | 100° | 62° | 81° | — | — |
| 1980 | 86° | 64° | 75° | — | — |
| 1979 | 93° | 61° | 77° | — | — |
| 1978 | 84° | 69° | 77° | — | — |
| 1977 | 76° | 67° | 71° | 5.44" | — |
| 1976coldest | 83° | 56° | 69° | — | — |
| 1975 | 88° | 54° | 71° | — | — |
| 1974 | 99° | 56° | 77° | — | — |
| 1973 | 100° | 66° | 83° | — | — |
| 1972 | 91° | 55° | 73° | — | — |
| 1971 | 100° | 65° | 82° | — | — |
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
Rialto, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.