Weather on April 21
Santa Rosa, CA
55 Years of Data
Avg High
71°F
Avg Low
45°F
Warmest
2009
73°F avg
Coldest
1971
47°F avg
About This Date
April 21st in Santa Rosa, CA typically brings pleasant spring weather, with average highs around 71°F and lows near 45°F — a 26°F daily swing. Over 55 years of records, the warmest April 21st was in 2009 (73°F average), while the coldest was 1971 (47°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 22% of April 21st dates historically, with the wettest April 21st recording 1.14" of rain. The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
Planning for April 21st in Santa Rosa, CA? Great weather for outdoor activities.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 47° | 61° | — | — |
| 2024 | 82° | 47° | 64° | — | — |
| 2023 | 81° | 48° | 64° | — | — |
| 2022 | 63° | 48° | 55° | 1.14" | — |
| 2021 | 74° | 46° | 60° | — | — |
| 2020 | 74° | 44° | 59° | — | — |
| 2019 | 75° | 48° | 62° | — | — |
| 2018 | 81° | 45° | 63° | — | — |
| 2017 | 76° | 49° | 62° | — | — |
| 2016 | 66° | 54° | 60° | — | — |
| 2015 | 56° | 48° | 52° | — | — |
| 2014 | 68° | 49° | 58° | — | — |
| 2013 | 82° | 55° | 69° | — | — |
| 2012 | 89° | 52° | 70° | — | — |
| 2011 | 65° | 41° | 53° | 0.76" | — |
| 2010 | 59° | 43° | 51° | 0.25" | — |
| 2009warmest | 93° | 54° | 73° | — | — |
| 2008 | 61° | 34° | 47° | — | — |
| 2007 | 65° | 39° | 52° | 0.2" | — |
| 2006 | 71° | 42° | 57° | — | — |
| 2005 | 73° | 43° | 58° | — | — |
| 2004 | 66° | 51° | 59° | 0.05" | — |
| 2003 | 50° | 44° | 47° | 0.33" | — |
| 2002 | 70° | 45° | 57° | — | — |
| 2001 | 67° | 39° | 53° | — | — |
| 2000 | 69° | 47° | 58° | — | — |
| 1999 | 71° | 49° | 60° | — | — |
| 1998 | 83° | 47° | 65° | — | — |
| 1997 | 68° | 56° | 62° | 0.05" | — |
| 1996 | 61° | 42° | 51° | 0.13" | — |
| 1995 | 71° | 44° | 58° | — | — |
| 1994 | 71° | 46° | 59° | — | — |
| 1993 | 69° | 47° | 58° | — | — |
| 1992 | 70° | 50° | 60° | — | — |
| 1991 | 67° | 51° | 59° | — | — |
| 1990 | 65° | 51° | 58° | — | — |
| 1989 | 69° | 54° | 61° | — | — |
| 1988 | — | 46° | — | 0.2" | — |
| 1987 | 83° | 46° | 64° | — | — |
| 1986 | 78° | 45° | 61° | — | — |
| 1985 | 58° | 44° | 51° | 0.51" | — |
| 1984 | 76° | 46° | 61° | — | — |
| 1983 | 66° | 45° | 55° | 0.33" | — |
| 1982 | 83° | 48° | 65° | — | — |
| 1981 | 68° | 44° | 56° | — | — |
| 1980 | 60° | 38° | 49° | 1.02" | — |
| 1979 | 74° | 35° | 54° | — | — |
| 1978 | 68° | 35° | 52° | — | — |
| 1977 | 72° | 40° | 56° | — | — |
| 1976 | 78° | 39° | 59° | — | — |
| 1975 | 72° | 44° | 58° | — | — |
| 1974 | 73° | 43° | 58° | — | — |
| 1973 | 81° | 45° | 63° | — | — |
| 1972 | 76° | 41° | 58° | — | — |
| 1971coldest | 63° | 31° | 47° | — | — |
55 years of data from SANTA ROSA