Weather on September 11
San Bernardino, CA
55 Years of Data
Avg High
91°F
Avg Low
61°F
Warmest
1971
89°F avg
Coldest
1976
65°F avg
About This Date
September 11th in San Bernardino, CA typically brings hot fall weather, with average highs around 91°F and lows near 61°F — a 30°F daily swing. Over 48 years of records, the warmest September 11th was in 1971 (89°F average), while the coldest was 1976 (65°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 11th dates historically, with the wettest September 11th recording 7.19" of rain.
Planning for September 11th in San Bernardino, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 63° | 73° | — | — |
| 2017 | 97° | 68° | 82° | — | — |
| 2016 | 88° | 63° | 75° | — | — |
| 2015 | 97° | 73° | 85° | — | — |
| 2014 | 98° | 66° | 82° | — | — |
| 2013 | 86° | 60° | 73° | — | — |
| 2012 | 87° | 73° | 80° | — | — |
| 2011 | 86° | 61° | 73° | — | — |
| 2010 | 94° | 50° | 72° | — | — |
| 2009 | 96° | 65° | 80° | — | — |
| 2008 | 85° | 57° | 71° | — | — |
| 2007 | 99° | 56° | 77° | — | — |
| 2006 | 99° | 58° | 78° | — | — |
| 2005 | 79° | 59° | 69° | — | — |
| 2004 | 100° | 69° | 85° | — | — |
| 2003 | 99° | 58° | 78° | — | — |
| 2002 | 93° | 54° | 73° | — | — |
| 2001 | 88° | 59° | 73° | — | — |
| 2000 | 99° | 58° | 78° | — | — |
| 1999 | 94° | 57° | 75° | — | — |
| 1998 | 91° | 57° | 74° | — | — |
| 1997 | 93° | 65° | 79° | — | — |
| 1996 | 92° | 63° | 77° | — | — |
| 1995 | 96° | 58° | 77° | — | — |
| 1994 | 90° | 56° | 73° | — | — |
| 1993 | 100° | 66° | 83° | — | — |
| 1992 | 87° | 60° | 74° | — | — |
| 1991 | 80° | 54° | 67° | — | — |
| 1990 | 103° | 63° | 83° | — | — |
| 1989 | 82° | 56° | 69° | — | — |
| 1988 | 82° | 56° | 69° | — | — |
| 1987 | 85° | 58° | 71° | — | — |
| 1986 | 83° | 56° | 69° | — | — |
| 1985 | 89° | 48° | 69° | — | — |
| 1984 | 84° | 70° | 77° | — | — |
| 1983 | 108° | 71° | 89° | — | — |
| 1982 | 86° | 64° | 75° | — | — |
| 1981 | 98° | 61° | 79° | — | — |
| 1980 | 90° | 56° | 73° | — | — |
| 1979 | 107° | 68° | 88° | — | — |
| 1978 | 85° | 61° | 73° | — | — |
| 1977 | 93° | 64° | 79° | — | — |
| 1976coldest | 69° | 61° | 65° | 7.19" | — |
| 1975 | 78° | 58° | 68° | — | — |
| 1974 | 94° | 60° | 77° | — | — |
| 1973 | 85° | 62° | 73° | — | — |
| 1972 | 80° | 59° | 70° | — | — |
| 1971warmest | 110° | 68° | 89° | — | — |
48 years of data from NORTON AFB