Weather on March 21
San Francisco, CA
55 Years of Data
Avg High
62°F
Avg Low
50°F
Warmest
1997
69°F avg
Coldest
1973
49°F avg
About This Date
March 21st in San Francisco, CA typically brings mild spring weather, with average highs around 62°F and lows near 50°F. Over 56 years of records, the warmest March 21st was in 1997 (69°F average), while the coldest was 1973 (49°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 32% of March 21st dates historically, with the wettest March 21st recording 3.51" of rain. The last decade has been 1.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.7°F cooler on this date compared to 20-30 years ago.
Planning for March 21st in San Francisco, CA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 73° | 53° | 63° | — | — |
| 2025 | 59° | 47° | 53° | — | — |
| 2024 | 65° | 52° | 58° | — | — |
| 2023 | 55° | 47° | 51° | 2.69" | — |
| 2022 | 64° | 48° | 56° | — | — |
| 2021 | 59° | 45° | 52° | — | — |
| 2020 | 63° | 49° | 56° | — | — |
| 2019 | 60° | 49° | 54° | — | — |
| 2018 | 64° | 53° | 59° | 0.89" | — |
| 2017 | 64° | 55° | 60° | 1.55" | — |
| 2016 | 61° | 49° | 55° | 1.04" | — |
| 2015 | 68° | 54° | 61° | — | — |
| 2014 | 61° | 50° | 55° | — | — |
| 2013 | 59° | 45° | 52° | — | — |
| 2012 | 65° | 50° | 57° | — | — |
| 2011 | 56° | 48° | 52° | — | — |
| 2010 | 62° | 50° | 56° | — | — |
| 2009 | 58° | 49° | 53° | 0.15" | — |
| 2008 | 63° | 47° | 55° | — | — |
| 2007 | 62° | 47° | 54° | — | — |
| 2006 | 55° | 43° | 49° | 0.13" | — |
| 2005 | 61° | 53° | 57° | 1.6" | — |
| 2004 | 62° | 52° | 57° | — | — |
| 2003 | 60° | 48° | 54° | — | — |
| 2002 | 60° | 49° | 54° | — | — |
| 2001 | 59° | 52° | 55° | — | — |
| 2000 | 75° | 53° | 64° | — | — |
| 1999 | 60° | 49° | 54° | 0.08" | — |
| 1998 | 62° | 54° | 58° | 0.2" | — |
| 1997warmest | 79° | 60° | 69° | — | — |
| 1996 | 61° | 51° | 56° | — | — |
| 1995 | 54° | 45° | 49° | 0.94" | — |
| 1994 | 63° | 49° | 56° | 0.03" | — |
| 1993 | 65° | 52° | 58° | — | — |
| 1992 | 67° | 56° | 61° | — | — |
| 1991 | 58° | 46° | 52° | 0.08" | — |
| 1990 | 66° | 50° | 58° | — | — |
| 1989 | 66° | 52° | 59° | — | — |
| 1988 | 65° | 52° | 58° | — | — |
| 1987 | 53° | 45° | 49° | 0.51" | — |
| 1986 | 68° | 52° | 60° | — | — |
| 1985 | 60° | 46° | 53° | — | — |
| 1984 | 62° | 47° | 54° | — | — |
| 1983 | 58° | 47° | 52° | 0.03" | — |
| 1982 | 58° | 45° | 51° | — | — |
| 1981 | 62° | 50° | 56° | 1.93" | — |
| 1980 | 59° | 48° | 54° | — | — |
| 1979 | 57° | 52° | 54° | — | — |
| 1978 | 62° | 57° | 60° | 0.76" | — |
| 1977 | 72° | 49° | 60° | — | — |
| 1976 | 67° | 48° | 57° | — | — |
| 1975 | 53° | 47° | 50° | 3.51" | — |
| 1974 | 54° | 50° | 52° | — | — |
| 1973coldest | 54° | 45° | 49° | 0.38" | — |
| 1972 | 57° | 48° | 53° | — | — |
| 1971 | 56° | 45° | 50° | — | — |
56 years of data from SAN FRANCISCO DWTN