Weather on October 21
Santa Rosa, CA
55 Years of Data
Avg High
76°F
Avg Low
47°F
Warmest
1991
73°F avg
Coldest
1985
50°F avg
About This Date
October 21st in Santa Rosa, CA typically brings pleasant fall weather, with average highs around 76°F and lows near 47°F — a 29°F daily swing. Over 55 years of records, the warmest October 21st was in 1991 (73°F average), while the coldest was 1985 (50°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 11% of October 21st dates historically, with the wettest October 21st recording 3.1" of rain. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Santa Rosa, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 48° | 65° | — | — |
| 2024 | 80° | 44° | 62° | — | — |
| 2023 | 70° | 48° | 59° | — | — |
| 2022 | 77° | 51° | 64° | — | — |
| 2021 | 64° | 58° | 61° | 1.47" | — |
| 2020 | 86° | 48° | 67° | — | — |
| 2019 | 88° | 48° | 68° | — | — |
| 2018 | 69° | 49° | 59° | — | — |
| 2017 | 72° | 40° | 56° | — | — |
| 2016 | 79° | 56° | 67° | — | — |
| 2015 | 85° | 55° | 70° | — | — |
| 2014 | 72° | 50° | 61° | — | — |
| 2013 | 73° | 45° | 59° | — | — |
| 2012 | 66° | 49° | 57° | — | — |
| 2011 | 79° | 44° | 61° | — | — |
| 2010 | 69° | 52° | 60° | — | — |
| 2009 | 74° | 48° | 61° | — | — |
| 2008 | 86° | 48° | 67° | — | — |
| 2007 | 82° | 41° | 62° | — | — |
| 2006 | 89° | 42° | 66° | — | — |
| 2005 | 73° | 46° | 60° | — | — |
| 2004 | 68° | 39° | 54° | — | — |
| 2003 | 89° | 48° | 69° | — | — |
| 2002 | 75° | 46° | 61° | — | — |
| 2001 | 62° | 48° | 55° | — | — |
| 2000 | 74° | 50° | 62° | — | — |
| 1999 | 87° | 48° | 68° | — | — |
| 1998 | 88° | 47° | 67° | — | — |
| 1997 | 67° | 49° | 58° | — | — |
| 1996 | 73° | 41° | 57° | — | — |
| 1995 | 79° | 46° | 62° | — | — |
| 1994 | 78° | 45° | 61° | — | — |
| 1993 | 76° | 53° | 64° | — | — |
| 1992 | 73° | 57° | 65° | 2.74" | — |
| 1991warmest | 91° | 55° | 73° | — | — |
| 1990 | 80° | 44° | 62° | — | — |
| 1989 | 64° | 58° | 61° | 2.95" | — |
| 1988 | 82° | 48° | 65° | — | — |
| 1987 | 74° | 52° | 63° | — | — |
| 1986 | 70° | 46° | 58° | — | — |
| 1985coldest | 55° | 44° | 50° | 3.1" | — |
| 1984 | 66° | 45° | 55° | — | — |
| 1983 | 80° | 47° | 63° | — | — |
| 1982 | 67° | 56° | 61° | 0.08" | — |
| 1981 | 79° | 49° | 64° | — | — |
| 1980 | 83° | 44° | 63° | — | — |
| 1979 | 68° | 39° | 54° | — | — |
| 1978 | 75° | 40° | 57° | — | — |
| 1977 | 76° | 40° | 58° | — | — |
| 1976 | 81° | 41° | 61° | — | — |
| 1975 | 78° | 50° | 64° | — | — |
| 1974 | 85° | 39° | 62° | — | — |
| 1973 | 68° | 58° | 63° | 0.56" | — |
| 1972 | 66° | 44° | 55° | — | — |
| 1971 | 75° | 37° | 56° | — | — |
55 years of data from SANTA ROSA