Weather on September 15
San Bernardino, CA
55 Years of Data
Avg High
90°F
Avg Low
60°F
Warmest
2014
89°F avg
Coldest
1977
65°F avg
About This Date
September 15th in San Bernardino, CA typically brings hot fall weather, with average highs around 90°F and lows near 60°F — a 30°F daily swing. Over 48 years of records, the warmest September 15th was in 2014 (89°F average), while the coldest was 1977 (65°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 6% of September 15th dates historically, with the wettest September 15th recording 0.69" of rain.
Planning for September 15th in San Bernardino, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 99° | 63° | 81° | — | — |
| 2017 | 73° | 58° | 65° | — | — |
| 2016 | 83° | 54° | 68° | — | — |
| 2015 | 73° | 64° | 69° | — | — |
| 2014warmest | 105° | 74° | 89° | — | — |
| 2013 | 99° | 66° | 82° | — | — |
| 2012 | 103° | 69° | 86° | — | — |
| 2011 | 90° | 60° | 75° | — | — |
| 2010 | 91° | 56° | 73° | — | — |
| 2009 | 84° | 58° | 71° | — | — |
| 2008 | 103° | 59° | 81° | — | — |
| 2007 | 94° | 52° | 73° | — | — |
| 2006 | 79° | 60° | 69° | — | — |
| 2005 | 85° | 52° | 68° | — | — |
| 2004 | 86° | 61° | 73° | — | — |
| 2003 | 96° | 62° | 79° | — | — |
| 2002 | 100° | 64° | 82° | — | — |
| 2001 | 95° | 60° | 78° | — | — |
| 2000 | 100° | 64° | 82° | — | — |
| 1999 | 87° | 56° | 71° | — | — |
| 1998 | 90° | 58° | 74° | — | — |
| 1997 | 83° | 70° | 76° | 0.69" | — |
| 1996 | 80° | — | — | — | — |
| 1995 | 103° | 66° | 84° | — | — |
| 1994 | 96° | 57° | 77° | — | — |
| 1993 | 78° | 56° | 67° | — | — |
| 1992 | 92° | 61° | 76° | — | — |
| 1991 | 87° | 60° | 74° | — | — |
| 1990 | 91° | 61° | 76° | — | — |
| 1989 | 95° | 64° | 80° | — | — |
| 1988 | 88° | 56° | 72° | — | — |
| 1987 | 89° | 57° | 73° | — | — |
| 1986 | 79° | 51° | 65° | — | — |
| 1985 | 83° | 55° | 69° | — | — |
| 1984 | 104° | 68° | 86° | 0.05" | — |
| 1983 | 98° | 67° | 82° | — | — |
| 1982 | 74° | 63° | 68° | — | — |
| 1981 | 97° | 63° | 80° | — | — |
| 1980 | 85° | 53° | 69° | — | — |
| 1979 | 106° | 66° | 86° | — | — |
| 1978 | 83° | 57° | 70° | — | — |
| 1977coldest | 76° | 54° | 65° | — | — |
| 1976 | 78° | 63° | 70° | 0.08" | — |
| 1975 | 98° | 61° | 79° | — | — |
| 1974 | 92° | 54° | 73° | — | — |
| 1973 | 83° | 58° | 70° | — | — |
| 1972 | 91° | 54° | 72° | — | — |
| 1971 | 98° | 64° | 81° | — | — |
48 years of data from NORTON AFB