Weather on October 21
San Bernardino, CA
55 Years of Data
Avg High
80°F
Avg Low
54°F
Warmest
2003
81°F avg
Coldest
2004
57°F avg
About This Date
October 21st in San Bernardino, CA typically brings warm fall weather, with average highs around 80°F and lows near 54°F — a 26°F daily swing. Over 48 years of records, the warmest October 21st was in 2003 (81°F average), while the coldest was 2004 (57°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 13% of October 21st dates historically, with the wettest October 21st recording 0.61" of rain.
Planning for October 21st in San Bernardino, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 55° | 73° | — | — |
| 2017 | 77° | 55° | 66° | — | — |
| 2016 | 91° | 65° | 78° | — | — |
| 2015 | 78° | 59° | 69° | — | — |
| 2014 | 80° | 56° | 68° | — | — |
| 2013 | 83° | 51° | 67° | — | — |
| 2012 | 70° | 61° | 65° | — | — |
| 2011 | 80° | 55° | 68° | — | — |
| 2010 | 60° | 56° | 58° | 0.15" | — |
| 2009 | 86° | 50° | 68° | — | — |
| 2008 | 94° | 52° | 73° | — | — |
| 2007 | 84° | 50° | 67° | — | — |
| 2006 | 96° | 50° | 73° | — | — |
| 2005 | 78° | 49° | 63° | — | — |
| 2004coldest | 64° | 50° | 57° | 0.61" | — |
| 2003warmest | 102° | 60° | 81° | — | — |
| 2002 | 75° | 53° | 64° | — | — |
| 2001 | 85° | 58° | 71° | — | — |
| 2000 | 79° | 58° | 68° | 0.05" | — |
| 1999 | 94° | 54° | 74° | — | — |
| 1998 | 81° | 51° | 66° | — | — |
| 1997 | 72° | 58° | 65° | — | — |
| 1996 | 72° | 56° | 64° | — | — |
| 1995 | 88° | 52° | 70° | — | — |
| 1994 | 80° | 47° | 63° | — | — |
| 1993 | 83° | 56° | 69° | — | — |
| 1992 | 68° | 52° | 60° | — | — |
| 1991 | 76° | 59° | 67° | — | — |
| 1990 | 82° | 46° | 64° | — | — |
| 1989 | 68° | 56° | 62° | 0.13" | — |
| 1988 | 81° | 57° | 69° | — | — |
| 1987 | 78° | 55° | 67° | — | — |
| 1986 | 80° | 47° | 63° | — | — |
| 1985 | 68° | 56° | 62° | 0.05" | — |
| 1984 | 75° | 49° | 62° | — | — |
| 1983 | 90° | 53° | 71° | — | — |
| 1982 | 84° | 53° | 69° | — | — |
| 1981 | 84° | 50° | 67° | — | — |
| 1980 | 89° | 51° | 70° | — | — |
| 1979 | 76° | 48° | 62° | — | — |
| 1978 | 79° | 58° | 68° | — | — |
| 1977 | 74° | 56° | 65° | — | — |
| 1976 | 80° | 62° | 71° | 0.13" | — |
| 1975 | 78° | 52° | 65° | — | — |
| 1974 | 72° | 57° | 64° | — | — |
| 1973 | 80° | 47° | 63° | — | — |
| 1972 | 72° | 47° | 59° | — | — |
| 1971 | 87° | 43° | 65° | — | — |
48 years of data from NORTON AFB