Weather on August 19
Rialto, CA
55 Years of Data
Avg High
92°F
Avg Low
64°F
Warmest
1992
89°F avg
Coldest
1983
70°F avg
About This Date
August 19th in Rialto, CA typically brings hot summer weather, with average highs around 92°F and lows near 64°F — a 28°F daily swing. Over 48 years of records, the warmest August 19th was in 1992 (89°F average), while the coldest was 1983 (70°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 19th dates historically, with the wettest August 19th recording 1.3" of rain.
Planning for August 19th in Rialto, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 66° | 81° | — | — |
| 2017 | 86° | 62° | 74° | — | — |
| 2016 | 94° | 66° | 80° | — | — |
| 2015 | 87° | 63° | 75° | — | — |
| 2014 | 83° | 62° | 72° | — | — |
| 2013 | 92° | 69° | 80° | — | — |
| 2012 | 95° | 71° | 83° | — | — |
| 2011 | 88° | 63° | 75° | — | — |
| 2010 | 92° | 70° | 81° | — | — |
| 2009 | 87° | 59° | 73° | — | — |
| 2008 | 86° | 61° | 73° | — | — |
| 2007 | 96° | 71° | 84° | — | — |
| 2006 | 89° | 62° | 76° | — | — |
| 2005 | 92° | 56° | 74° | — | — |
| 2004 | 91° | 62° | 77° | — | — |
| 2003 | 97° | 65° | 81° | — | — |
| 2002 | 86° | 58° | 72° | — | — |
| 2001 | 95° | 70° | 82° | — | — |
| 2000 | 96° | 65° | 80° | — | — |
| 1999 | 101° | 66° | 83° | — | — |
| 1998 | 90° | 56° | 73° | — | — |
| 1997 | 93° | 67° | 80° | — | — |
| 1996 | 92° | 56° | 74° | — | — |
| 1995 | 99° | 64° | 81° | — | — |
| 1994 | 95° | 69° | 82° | — | — |
| 1993 | 91° | 59° | 75° | — | — |
| 1992warmest | 102° | 76° | 89° | — | — |
| 1991 | 89° | 61° | 75° | — | — |
| 1990 | 85° | 61° | 73° | — | — |
| 1989 | 86° | 59° | 73° | — | — |
| 1988 | 93° | 62° | 78° | — | — |
| 1987 | 93° | 58° | 75° | — | — |
| 1986 | 101° | 68° | 84° | — | — |
| 1985 | 92° | 57° | 74° | — | — |
| 1984 | 90° | 69° | 79° | — | — |
| 1983coldest | 74° | 66° | 70° | 1.3" | — |
| 1982 | 105° | 66° | 86° | — | — |
| 1981 | 98° | 67° | 82° | — | — |
| 1980 | 84° | 63° | 73° | — | — |
| 1979 | 87° | 66° | 77° | — | — |
| 1978 | 88° | 69° | 78° | — | — |
| 1977 | 96° | 69° | 83° | — | — |
| 1976 | 86° | 55° | 71° | — | — |
| 1975 | 86° | 57° | 72° | — | — |
| 1974 | 90° | 59° | 74° | — | — |
| 1973 | 105° | 67° | 86° | — | — |
| 1972 | 88° | 60° | 74° | — | — |
| 1971 | 98° | 65° | 81° | — | — |
48 years of data from FONTANA 5 N