Weather on March 21
Santa Rosa, CA
55 Years of Data
Avg High
65°F
Avg Low
44°F
Warmest
2026
72°F avg
Coldest
1987
41°F avg
About This Date
March 21st in Santa Rosa, CA typically brings mild spring weather, with average highs around 65°F and lows near 44°F. Over 56 years of records, the warmest March 21st was in 2026 (72°F average), while the coldest was 1987 (41°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 23% of March 21st dates historically, with the wettest March 21st recording 4.06" of rain. The last decade has been 2.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.6°F cooler on this date compared to 20-30 years ago.
Planning for March 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 |
|---|---|---|---|---|---|
| 2026warmest | 91° | 53° | 72° | — | — |
| 2025 | 65° | 41° | 53° | — | — |
| 2024 | 68° | 47° | 57° | — | — |
| 2023 | 56° | 42° | 49° | 2.84" | — |
| 2022 | 77° | 44° | 61° | — | — |
| 2021 | 69° | 36° | 52° | — | — |
| 2020 | 69° | 38° | 53° | — | — |
| 2019 | 65° | 37° | 51° | — | — |
| 2018 | 62° | 52° | 57° | 2.51" | — |
| 2017 | 62° | 52° | 57° | — | — |
| 2016 | 56° | 45° | 50° | — | — |
| 2015 | 69° | 50° | 60° | — | — |
| 2014 | 65° | 40° | 52° | — | — |
| 2013 | 65° | 41° | 53° | — | — |
| 2012 | 68° | 49° | 58° | — | — |
| 2011 | 60° | 36° | 48° | — | — |
| 2010 | 66° | 42° | 54° | — | — |
| 2009 | 69° | 47° | 58° | 0.23" | — |
| 2008 | 68° | 35° | 52° | — | — |
| 2007 | 72° | 42° | 57° | — | — |
| 2006 | 58° | 41° | 49° | — | — |
| 2005 | 61° | 50° | 55° | 0.51" | — |
| 2004 | 69° | 51° | 60° | — | — |
| 2003 | 69° | 44° | 57° | — | — |
| 2002 | 63° | 44° | 53° | — | — |
| 2001 | 65° | 49° | 57° | — | — |
| 2000 | 80° | 56° | 68° | — | — |
| 1999 | 60° | 48° | 54° | 0.05" | — |
| 1998 | 59° | 54° | 56° | 0.18" | — |
| 1997 | 78° | 55° | 67° | — | — |
| 1996 | 68° | 43° | 55° | — | — |
| 1995 | 55° | 43° | 49° | 1.45" | — |
| 1994 | 60° | 42° | 51° | — | — |
| 1993 | 66° | 48° | 57° | — | — |
| 1992 | 64° | 47° | 55° | — | — |
| 1991 | 59° | 42° | 51° | 0.05" | — |
| 1990 | 71° | 44° | 58° | — | — |
| 1989 | 69° | 49° | 59° | — | — |
| 1988 | 71° | 47° | 59° | — | — |
| 1987coldest | 49° | 34° | 41° | 1.83" | — |
| 1986 | 65° | 41° | 53° | — | — |
| 1985 | 63° | 41° | 52° | — | — |
| 1984 | 66° | 43° | 54° | — | — |
| 1983 | 60° | 40° | 50° | 0.64" | — |
| 1982 | 64° | 33° | 49° | — | — |
| 1981 | 52° | 43° | 47° | 1.68" | — |
| 1980 | 67° | 41° | 54° | — | — |
| 1979 | 65° | 42° | 53° | — | — |
| 1978 | 69° | 48° | 59° | — | — |
| 1977 | 76° | 38° | 57° | — | — |
| 1976 | 75° | 36° | 55° | — | — |
| 1975 | 56° | 39° | 47° | 4.06" | — |
| 1974 | 60° | 50° | 55° | — | — |
| 1973 | 54° | 41° | 47° | 1.02" | — |
| 1972 | 66° | 46° | 56° | — | — |
| 1971 | 71° | 37° | 54° | — | — |
56 years of data from SANTA ROSA