Weather on August 20
San Bernardino, CA
55 Years of Data
About This Date
August 20th in San Bernardino, CA typically brings hot summer weather, with average highs around 93°F and lows near 63°F — a 30°F daily swing. Over 48 years of records, the warmest August 20th was in 1982 (88°F average), while the coldest was 1989 (68°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 20th dates historically.
Planning for August 20th in San Bernardino, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 102° | 67° | 84° | — | — |
| 2017 | 89° | 59° | 74° | — | — |
| 2016 | 90° | 67° | 78° | — | — |
| 2015 | 86° | 60° | 73° | — | — |
| 2014 | 81° | 64° | 72° | 0.05" | — |
| 2013 | 94° | 67° | 80° | — | — |
| 2012 | 100° | 69° | 85° | — | — |
| 2011 | 90° | 60° | 75° | — | — |
| 2010 | 97° | 63° | 80° | — | — |
| 2009 | 95° | 60° | 78° | — | — |
| 2008 | 92° | 57° | 74° | — | — |
| 2007 | 103° | 62° | 82° | — | — |
| 2006 | 93° | 59° | 76° | — | — |
| 2005 | 98° | 60° | 79° | — | — |
| 2004 | 89° | 60° | 75° | — | — |
| 2003 | 96° | 68° | 82° | — | — |
| 2002 | 84° | 63° | 73° | — | — |
| 2001 | 100° | 67° | 83° | — | — |
| 2000 | 94° | 59° | 76° | — | — |
| 1999 | 100° | 67° | 83° | — | — |
| 1998 | 95° | 59° | 77° | — | — |
| 1997 | 95° | 67° | 81° | — | — |
| 1996 | 95° | 61° | 78° | — | — |
| 1995 | 97° | 63° | 80° | — | — |
| 1994 | 95° | 69° | 82° | — | — |
| 1993 | 92° | 57° | 74° | — | — |
| 1992 | 103° | 71° | 87° | — | — |
| 1991 | 94° | 62° | 78° | — | — |
| 1990 | 84° | 59° | 72° | — | — |
| 1989coldest | 79° | 57° | 68° | — | — |
| 1988 | 88° | 60° | 74° | — | — |
| 1987 | 92° | 62° | 77° | — | — |
| 1986 | 103° | 71° | 87° | — | — |
| 1985 | 91° | 59° | 75° | — | — |
| 1984 | 90° | 70° | 80° | — | — |
| 1983 | 79° | 66° | 72° | 0.08" | — |
| 1982warmest | 108° | 68° | 88° | — | — |
| 1981 | 101° | 63° | 82° | — | — |
| 1980 | 90° | 57° | 73° | — | — |
| 1979 | 87° | 66° | 77° | — | — |
| 1978 | 98° | 55° | 77° | — | — |
| 1977 | 100° | 69° | 85° | — | — |
| 1976 | 90° | 59° | 74° | — | — |
| 1975 | 86° | 57° | 72° | — | — |
| 1974 | 88° | 59° | 73° | — | — |
| 1973 | 98° | 70° | 84° | — | — |
| 1972 | 95° | 55° | 75° | — | — |
| 1971 | 97° | 62° | 79° | — | — |
San Bernardino, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
San Bernardino, CA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
San Bernardino, 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 San Bernardino, CA
San Bernardino, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.