Weather on September 20
San Bernardino, CA
55 Years of Data
About This Date
September 20th in San Bernardino, CA typically brings warm fall weather, with average highs around 88°F and lows near 59°F — a 29°F daily swing. Over 48 years of records, the warmest September 20th was in 2015 (85°F average), while the coldest was 1988 (57°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 20th dates historically.
Planning for September 20th in San Bernardino, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 64° | 78° | — | — |
| 2017 | 72° | 60° | 66° | — | — |
| 2016 | 81° | 67° | 74° | — | — |
| 2015warmest | 99° | 71° | 85° | — | — |
| 2014 | 82° | 62° | 72° | — | — |
| 2013 | 78° | 61° | 69° | — | — |
| 2012 | 102° | 64° | 83° | — | — |
| 2011 | 95° | 60° | 78° | — | — |
| 2010 | 92° | 54° | 73° | — | — |
| 2009 | 94° | 59° | 76° | — | — |
| 2008 | 85° | 58° | 71° | — | — |
| 2007 | 71° | 56° | 63° | — | — |
| 2006 | 87° | 53° | 70° | — | — |
| 2005 | 78° | 64° | 71° | 0.46" | — |
| 2004 | 77° | 53° | 65° | — | — |
| 2003 | 99° | 59° | 79° | — | — |
| 2002 | 96° | 58° | 77° | — | — |
| 2001 | 91° | 57° | 74° | — | — |
| 2000 | 88° | 63° | 75° | — | — |
| 1999 | 95° | 51° | 73° | — | — |
| 1998 | 74° | 60° | 67° | — | — |
| 1997 | 87° | 60° | 74° | — | — |
| 1996 | 91° | 59° | 75° | — | — |
| 1995 | 95° | 59° | 77° | — | — |
| 1994 | 89° | 57° | 73° | — | — |
| 1993 | 78° | 56° | 67° | — | — |
| 1992 | 97° | 59° | 78° | — | — |
| 1991 | 91° | 65° | 78° | — | — |
| 1990 | 78° | 62° | 70° | — | — |
| 1989 | 82° | 50° | 66° | — | — |
| 1988coldest | 60° | 54° | 57° | 0.15" | — |
| 1987 | 95° | 60° | 78° | — | — |
| 1986 | 73° | 53° | 63° | — | — |
| 1985 | 91° | 56° | 73° | — | — |
| 1984 | 99° | 69° | 84° | — | — |
| 1983 | 85° | 67° | 76° | — | — |
| 1982 | 94° | 55° | 74° | — | — |
| 1981 | 96° | — | — | — | — |
| 1980 | 87° | 55° | 71° | — | — |
| 1979 | 103° | 64° | 83° | — | — |
| 1978 | 84° | 65° | 74° | — | — |
| 1977 | 81° | 53° | 67° | — | — |
| 1976 | 78° | 63° | 70° | — | — |
| 1975 | 95° | 62° | 79° | — | — |
| 1974 | 96° | 59° | 78° | — | — |
| 1973 | 82° | 54° | 68° | — | — |
| 1972 | 97° | 51° | 74° | — | — |
| 1971 | 90° | 49° | 69° | — | — |
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.