Weather on September 12
San Bernardino, CA
55 Years of Data
Avg High
90°F
Avg Low
61°F
Warmest
1971
92°F avg
Coldest
1988
67°F avg
About This Date
September 12th in San Bernardino, CA typically brings hot fall weather, with average highs around 90°F and lows near 61°F — a 29°F daily swing. Over 48 years of records, the warmest September 12th was in 1971 (92°F average), while the coldest was 1988 (67°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 12th dates historically.
Planning for September 12th in San Bernardino, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 61° | 72° | — | — |
| 2017 | 89° | 67° | 78° | — | — |
| 2016 | 77° | 57° | 67° | — | — |
| 2015 | 89° | 70° | 79° | — | — |
| 2014 | 100° | 68° | 84° | — | — |
| 2013 | 92° | 60° | 76° | — | — |
| 2012 | 94° | 70° | 82° | — | — |
| 2011 | 97° | 55° | 76° | — | — |
| 2010 | 94° | 57° | 75° | — | — |
| 2009 | 93° | 64° | 79° | — | — |
| 2008 | 78° | 59° | 69° | — | — |
| 2007 | 100° | 61° | 80° | — | — |
| 2006 | 100° | 62° | 81° | — | — |
| 2005 | 80° | 54° | 67° | — | — |
| 2004 | 97° | 60° | 78° | — | — |
| 2003 | 95° | 60° | 78° | — | — |
| 2002 | 95° | 60° | 78° | — | — |
| 2001 | 88° | 60° | 74° | — | — |
| 2000 | 105° | 64° | 85° | — | — |
| 1999 | 99° | 60° | 79° | — | — |
| 1998 | 91° | 53° | 72° | — | — |
| 1997 | 88° | 64° | 76° | — | — |
| 1996 | 89° | 57° | 73° | — | — |
| 1995 | 100° | 64° | 82° | — | — |
| 1994 | 82° | 59° | 71° | — | — |
| 1993 | 83° | 63° | 73° | — | — |
| 1992 | 89° | 59° | 74° | — | — |
| 1991 | 81° | 56° | 68° | — | — |
| 1990 | 102° | 67° | 84° | — | — |
| 1989 | 85° | 60° | 72° | — | — |
| 1988coldest | 78° | 56° | 67° | — | — |
| 1987 | 74° | 62° | 68° | — | — |
| 1986 | 80° | 58° | 69° | — | — |
| 1985 | 94° | 56° | 75° | — | — |
| 1984 | 88° | 68° | 78° | 0.05" | — |
| 1983 | 103° | 71° | 87° | — | — |
| 1982 | 82° | 60° | 71° | — | — |
| 1981 | 98° | 60° | 79° | — | — |
| 1980 | 89° | 59° | 74° | — | — |
| 1979 | 106° | 69° | 87° | — | — |
| 1978 | 81° | 57° | 69° | — | — |
| 1977 | 88° | 58° | 73° | — | — |
| 1976 | 76° | 63° | 69° | — | — |
| 1975 | 82° | 59° | 71° | — | — |
| 1974 | 89° | 63° | 76° | — | — |
| 1973 | 87° | 56° | 71° | — | — |
| 1972 | 86° | 51° | 69° | — | — |
| 1971warmest | 115° | 69° | 92° | — | — |
48 years of data from NORTON AFB