Weather on September 17
San Bernardino, CA
55 Years of Data
Avg High
89°F
Avg Low
60°F
Warmest
2000
88°F avg
Coldest
1985
58°F avg
About This Date
September 17th in San Bernardino, CA typically brings warm fall weather, with average highs around 89°F and lows near 60°F — a 29°F daily swing. Over 48 years of records, the warmest September 17th was in 2000 (88°F average), while the coldest was 1985 (58°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 6% of September 17th dates historically, with the wettest September 17th recording 0.79" of rain.
Planning for September 17th 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 | 97° | 70° | 83° | — | — |
| 2017 | 75° | 59° | 67° | — | — |
| 2016 | 97° | 62° | 79° | — | — |
| 2015 | 78° | 58° | 68° | — | — |
| 2014 | 97° | 76° | 86° | — | — |
| 2013 | 90° | 61° | 75° | — | — |
| 2012 | 93° | 61° | 77° | — | — |
| 2011 | 82° | 61° | 71° | — | — |
| 2010 | 91° | 54° | 72° | — | — |
| 2009 | 99° | 60° | 79° | — | — |
| 2008 | 94° | 63° | 78° | — | — |
| 2007 | 80° | 55° | 68° | — | — |
| 2006 | 97° | 52° | 74° | — | — |
| 2005 | 85° | 52° | 68° | — | — |
| 2004 | 90° | 60° | 75° | — | — |
| 2003 | 90° | 56° | 73° | — | — |
| 2002 | 93° | 57° | 75° | — | — |
| 2001 | 98° | 55° | 77° | — | — |
| 2000warmest | 108° | 69° | 88° | — | — |
| 1999 | 87° | 57° | 72° | — | — |
| 1998 | 94° | 59° | 76° | — | — |
| 1997 | 92° | 68° | 80° | — | — |
| 1996 | 86° | 65° | 75° | — | — |
| 1995 | 92° | 61° | 76° | — | — |
| 1994 | 94° | 56° | 75° | — | — |
| 1993 | 73° | 59° | 66° | — | — |
| 1992 | 93° | 65° | 79° | — | — |
| 1991 | 101° | 59° | 80° | — | — |
| 1990 | 83° | 56° | 69° | — | — |
| 1989 | 80° | 63° | 71° | 0.28" | — |
| 1988 | 78° | 59° | 69° | — | — |
| 1987 | 85° | 57° | 71° | — | — |
| 1986 | 84° | 55° | 70° | — | — |
| 1985coldest | 59° | 57° | 58° | 0.79" | — |
| 1984 | 101° | 72° | 86° | — | — |
| 1983 | 98° | 67° | 82° | — | — |
| 1982 | 78° | 54° | 66° | 0.15" | — |
| 1981 | 104° | 65° | 84° | — | — |
| 1980 | 105° | 67° | 86° | — | — |
| 1979 | 100° | 65° | 82° | — | — |
| 1978 | 77° | 60° | 69° | — | — |
| 1977 | 78° | 54° | 66° | — | — |
| 1976 | 79° | 61° | 70° | — | — |
| 1975 | 97° | 68° | 82° | — | — |
| 1974 | 95° | 55° | 75° | — | — |
| 1973 | 87° | 52° | 69° | — | — |
| 1972 | 88° | 56° | 72° | — | — |
| 1971 | 80° | 66° | 73° | — | — |
48 years of data from NORTON AFB