Weather on May 21
San Francisco, CA
55 Years of Data
Avg High
65°F
Avg Low
51°F
Warmest
2000
73°F avg
Coldest
1982
53°F avg
About This Date
May 21st in San Francisco, CA typically brings mild spring weather, with average highs around 65°F and lows near 51°F. Over 55 years of records, the warmest May 21st was in 2000 (73°F average), while the coldest was 1982 (53°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 9% of May 21st dates historically, with the wettest May 21st recording 0.66" of rain. The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
Planning for May 21st in San Francisco, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 51° | 59° | — | — |
| 2024 | 69° | 51° | 60° | — | — |
| 2023 | 65° | 50° | 57° | — | — |
| 2022 | 68° | 50° | 59° | — | — |
| 2021 | 61° | 49° | 55° | — | — |
| 2020 | 67° | 53° | 60° | — | — |
| 2019 | 59° | 52° | 55° | 0.51" | — |
| 2018 | 61° | 51° | 56° | — | — |
| 2017 | 69° | 52° | 60° | — | — |
| 2016 | 62° | 52° | 57° | — | — |
| 2015 | 64° | 53° | 59° | 0.08" | — |
| 2014 | 67° | 52° | 59° | — | — |
| 2013 | 61° | 51° | 56° | — | — |
| 2012 | 59° | 50° | 55° | — | — |
| 2011 | 60° | 51° | 56° | — | — |
| 2010 | 58° | 49° | 53° | — | — |
| 2009 | 61° | 48° | 54° | — | — |
| 2008 | 63° | 51° | 57° | — | — |
| 2007 | 67° | 49° | 58° | — | — |
| 2006 | 67° | 54° | 60° | 0.66" | — |
| 2005 | 69° | 53° | 61° | — | — |
| 2004 | 60° | 52° | 56° | — | — |
| 2003 | 63° | 49° | 56° | — | — |
| 2002 | 59° | 50° | 55° | 0.41" | — |
| 2001 | 70° | 52° | 61° | — | — |
| 2000warmest | 90° | 57° | 73° | — | — |
| 1999 | 66° | 48° | 57° | — | — |
| 1998 | 60° | 51° | 56° | — | — |
| 1997 | 67° | 53° | 60° | — | — |
| 1996 | 69° | 53° | 61° | 0.51" | — |
| 1995 | 58° | 54° | 56° | — | — |
| 1994 | 64° | 51° | 58° | — | — |
| 1993 | 71° | 58° | 64° | — | — |
| 1992 | 77° | 54° | 65° | — | — |
| 1991 | 65° | 50° | 57° | — | — |
| 1990 | 70° | 54° | 62° | — | — |
| 1989 | 62° | 50° | 56° | — | — |
| 1988 | 79° | 53° | 66° | — | — |
| 1987 | 62° | 51° | 57° | — | — |
| 1986 | 62° | 51° | 57° | — | — |
| 1985 | 73° | 51° | 62° | — | — |
| 1984 | 68° | 49° | 58° | — | — |
| 1983 | 70° | 53° | 61° | — | — |
| 1982coldest | 57° | 49° | 53° | — | — |
| 1981 | 60° | 51° | 56° | — | — |
| 1980 | 58° | 51° | 54° | — | — |
| 1979 | 64° | 57° | 61° | — | — |
| 1978 | 59° | 52° | 55° | — | — |
| 1977 | 59° | 50° | 55° | — | — |
| 1976 | 61° | 50° | 55° | — | — |
| 1975 | 70° | 50° | 60° | — | — |
| 1974 | 63° | 48° | 55° | — | — |
| 1973 | 61° | 51° | 56° | — | — |
| 1972 | 62° | 53° | 58° | — | — |
| 1971 | 62° | 47° | 54° | — | — |
55 years of data from SAN FRANCISCO DWTN