Weather on August 31
Rialto, CA
55 Years of Data
About This Date
August 31st in Rialto, CA typically brings hot summer weather, with average highs around 95°F and lows near 65°F — a 30°F daily swing. Over 46 years of records, the warmest August 31st was in 2007 (93°F average), while the coldest was 1992 (64°F) — a 29°F range across recorded history. This date has historically been dry, with little recorded precipitation.
Planning for August 31st in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2017 | 106° | 75° | 90° | — | — |
| 2016 | 98° | 74° | 86° | — | — |
| 2015 | 89° | 65° | 77° | — | — |
| 2014 | 94° | 70° | 82° | — | — |
| 2013 | 90° | 73° | 81° | — | — |
| 2012 | 91° | 70° | 80° | — | — |
| 2011 | 90° | 62° | 76° | — | — |
| 2010 | 88° | 56° | 72° | — | — |
| 2009 | 97° | 74° | 85° | — | — |
| 2008 | 85° | 66° | 75° | — | — |
| 2007warmest | 105° | 80° | 93° | — | — |
| 2006 | 96° | 67° | 81° | — | — |
| 2005 | 94° | 62° | 78° | — | — |
| 2004 | 104° | 69° | 87° | — | — |
| 2003 | 99° | 65° | 82° | — | — |
| 2002 | 97° | 68° | 82° | — | — |
| 2001 | 92° | 60° | 76° | — | — |
| 2000 | 79° | 58° | 68° | — | — |
| 1999 | 90° | 56° | 73° | — | — |
| 1998 | 105° | 67° | 86° | — | — |
| 1997 | 97° | 64° | 80° | — | — |
| 1996 | 99° | 68° | 83° | — | — |
| 1995 | 103° | 74° | 88° | — | — |
| 1994 | 88° | 60° | 74° | — | — |
| 1993 | 94° | 60° | 77° | — | — |
| 1992coldest | 77° | 52° | 64° | — | — |
| 1991 | 92° | 63° | 77° | — | — |
| 1990 | 91° | 62° | 77° | — | — |
| 1989 | 91° | 54° | 72° | — | — |
| 1988 | 97° | 68° | 82° | — | — |
| 1987 | 99° | 66° | 82° | — | — |
| 1985 | 103° | 70° | 86° | — | — |
| 1984 | 101° | 71° | 86° | — | — |
| 1983 | 99° | 64° | 81° | — | — |
| 1982 | 100° | 64° | 82° | — | — |
| 1981 | 96° | 60° | 78° | — | — |
| 1980 | 91° | 57° | 74° | — | — |
| 1979 | 92° | 58° | 75° | — | — |
| 1978 | 93° | 73° | 83° | — | — |
| 1977 | 90° | 64° | 77° | — | — |
| 1976 | 104° | 68° | 86° | — | — |
| 1975 | 97° | 57° | 77° | — | — |
| 1974 | 101° | 58° | 79° | — | — |
| 1973 | 86° | 55° | 71° | — | — |
| 1972 | 97° | 66° | 81° | — | — |
| 1971 | 95° | 54° | 74° | — | — |
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.