Weather on September 30
San Bernardino, CA
55 Years of Data
Avg High
89°F
Avg Low
59°F
Warmest
1980
86°F avg
Coldest
1971
60°F avg
About This Date
September 30th in San Bernardino, CA typically brings warm fall weather, with average highs around 89°F and lows near 59°F — a 30°F daily swing. Over 48 years of records, the warmest September 30th was in 1980 (86°F average), while the coldest was 1971 (60°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 30th dates historically, with the wettest September 30th recording 1.42" of rain.
Planning for September 30th in San Bernardino, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 59° | 70° | — | — |
| 2017 | 84° | 61° | 72° | — | — |
| 2016 | 89° | 68° | 79° | — | — |
| 2015 | 92° | 68° | 80° | — | — |
| 2014 | 87° | 58° | 72° | — | — |
| 2013 | 87° | 54° | 70° | — | — |
| 2012 | 104° | 64° | 84° | — | — |
| 2011 | 94° | 59° | 76° | — | — |
| 2010 | 87° | 65° | 76° | — | — |
| 2009 | 86° | 58° | 72° | — | — |
| 2008 | 102° | 65° | 83° | — | — |
| 2007 | 97° | 52° | 74° | — | — |
| 2006 | 90° | 55° | 72° | — | — |
| 2005 | 97° | 60° | 78° | — | — |
| 2004 | 73° | 55° | 64° | — | — |
| 2003 | 94° | 61° | 77° | — | — |
| 2002 | 71° | 58° | 64° | — | — |
| 2001 | 102° | 66° | 84° | — | — |
| 2000 | 81° | 58° | 69° | — | — |
| 1999 | 101° | 60° | 80° | — | — |
| 1998 | 75° | 55° | 65° | — | — |
| 1997 | 94° | 66° | 80° | — | — |
| 1996 | 90° | 63° | 76° | — | — |
| 1995 | 91° | 53° | 72° | — | — |
| 1994 | 87° | 65° | 76° | — | — |
| 1993 | 95° | 61° | 78° | — | — |
| 1992 | 101° | 66° | 83° | — | — |
| 1991 | 96° | 62° | 79° | — | — |
| 1990 | 91° | 55° | 73° | — | — |
| 1989 | 86° | 54° | 70° | — | — |
| 1988 | 96° | 58° | 77° | — | — |
| 1987 | 101° | 63° | 82° | — | — |
| 1986 | 83° | 51° | 67° | — | — |
| 1985 | 75° | 62° | 69° | — | — |
| 1984 | 90° | 63° | 76° | — | — |
| 1983 | 65° | 58° | 61° | 1.42" | — |
| 1982 | 78° | 48° | 63° | — | — |
| 1981 | 82° | 60° | 71° | — | — |
| 1980warmest | 110° | 63° | 86° | — | — |
| 1979 | 86° | 58° | 72° | — | — |
| 1978 | 98° | 63° | 80° | — | — |
| 1977 | 86° | 61° | 73° | — | — |
| 1976 | 83° | 64° | 73° | — | — |
| 1975 | 86° | 52° | 69° | — | — |
| 1974 | 97° | 59° | 78° | — | — |
| 1973 | 89° | 53° | 71° | — | — |
| 1972 | 90° | 60° | 75° | — | — |
| 1971coldest | 72° | 48° | 60° | — | — |
48 years of data from NORTON AFB