Weather on August 21
Santa Rosa, CA
55 Years of Data
About This Date
August 21st in Santa Rosa, CA typically brings warm summer weather, with average highs around 81°F and lows near 53°F — a 28°F daily swing. Over 55 years of records, the warmest August 21st was in 2019 (76°F average), while the coldest was 2010 (59°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 21st dates historically. The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Santa Rosa, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 99° | 54° | 76° | — | — |
| 2024 | 90° | 48° | 69° | — | — |
| 2023 | 85° | 60° | 72° | — | — |
| 2022 | 92° | 55° | 73° | — | — |
| 2021 | 71° | 55° | 63° | 0.08" | — |
| 2020 | 95° | 56° | 75° | — | — |
| 2019warmest | 97° | 55° | 76° | — | — |
| 2018 | 79° | 54° | 66° | — | — |
| 2017 | 66° | 58° | 62° | — | — |
| 2016 | 75° | 53° | 64° | — | — |
| 2015 | 75° | 55° | 65° | — | — |
| 2014 | 79° | 55° | 67° | — | — |
| 2013 | 74° | 53° | 63° | — | — |
| 2012 | 80° | 50° | 65° | — | — |
| 2011 | 77° | 55° | 66° | — | — |
| 2010coldest | 67° | 51° | 59° | — | — |
| 2009 | 93° | 53° | 73° | — | — |
| 2008 | 87° | 60° | 74° | — | — |
| 2007 | 91° | 56° | 73° | — | — |
| 2006 | 75° | 52° | 63° | — | — |
| 2005 | 76° | 52° | 64° | — | — |
| 2004 | 77° | 56° | 66° | — | — |
| 2003 | 81° | 57° | 69° | — | — |
| 2002 | 77° | 53° | 65° | — | — |
| 2001 | 82° | 50° | 66° | — | — |
| 2000 | 83° | 54° | 68° | — | — |
| 1999 | 88° | 55° | 71° | — | — |
| 1998 | 81° | 52° | 66° | — | — |
| 1997 | 83° | 55° | 69° | — | — |
| 1996 | 85° | 54° | 69° | — | — |
| 1995 | 79° | 56° | 67° | — | — |
| 1994 | 83° | 53° | 68° | — | — |
| 1993 | 87° | 56° | 71° | — | — |
| 1992 | 85° | 51° | 68° | — | — |
| 1991 | 75° | 53° | 64° | — | — |
| 1990 | 79° | 57° | 68° | — | — |
| 1989 | 69° | 55° | 62° | 0.08" | — |
| 1988 | 74° | 55° | 64° | — | — |
| 1987 | 69° | 51° | 60° | — | — |
| 1986 | 73° | 48° | 61° | — | — |
| 1985 | 73° | 49° | 61° | — | — |
| 1984 | 71° | 51° | 61° | — | — |
| 1983 | 79° | 57° | 68° | — | — |
| 1982 | 94° | 50° | 72° | — | — |
| 1981 | 81° | 49° | 65° | — | — |
| 1980 | 74° | 50° | 62° | — | — |
| 1979 | 73° | 58° | 65° | — | — |
| 1978 | 90° | 50° | 70° | — | — |
| 1977 | 92° | 50° | 71° | — | — |
| 1976 | 81° | 50° | 65° | — | — |
| 1975 | 79° | 50° | 64° | — | — |
| 1974 | 96° | 50° | 73° | — | — |
| 1973 | 80° | 47° | 63° | — | — |
| 1972 | 93° | 51° | 72° | — | — |
| 1971 | 85° | 52° | 68° | — | — |
Santa Rosa, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Santa Rosa, CA Monthly Precipitation
Average rainfall per month, in inches.
Santa Rosa, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Santa Rosa, CA
Most pleasant months in Santa Rosa, CA: July.