Weather on April 21
San Francisco, CA
55 Years of Data
Avg High
64°F
Avg Low
50°F
Warmest
2009
76°F avg
Coldest
1971
48°F avg
About This Date
April 21st in San Francisco, CA typically brings mild spring weather, with average highs around 64°F and lows near 50°F. Over 55 years of records, the warmest April 21st was in 2009 (76°F average), while the coldest was 1971 (48°F) — a 28°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 0.64" of rain. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for April 21st in San Francisco, CA? Great weather for outdoor activities.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 64° | 49° | 56° | — | — |
| 2024 | 68° | 52° | 60° | — | — |
| 2023 | 72° | 52° | 62° | — | — |
| 2022 | 62° | 51° | 57° | 0.64" | — |
| 2021 | 54° | 48° | 51° | — | — |
| 2020 | 63° | 51° | 57° | — | — |
| 2019 | 64° | 49° | 56° | — | — |
| 2018 | 71° | 49° | 60° | — | — |
| 2017 | 72° | 53° | 62° | — | — |
| 2016 | 68° | 59° | 64° | — | — |
| 2015 | 55° | 52° | 53° | — | — |
| 2014 | 63° | 51° | 57° | 0.03" | — |
| 2013 | 76° | 50° | 63° | — | — |
| 2012 | 79° | 55° | 67° | — | — |
| 2011 | 59° | 48° | 54° | 0.23" | — |
| 2010 | 56° | 48° | 52° | 0.03" | — |
| 2009warmest | 87° | 64° | 76° | — | — |
| 2008 | 55° | 44° | 50° | — | — |
| 2007 | 58° | 49° | 53° | 0.36" | — |
| 2006 | 63° | 49° | 56° | — | — |
| 2005 | 68° | 48° | 58° | — | — |
| 2004 | 59° | 50° | 55° | 0.1" | — |
| 2003 | 56° | 47° | 51° | 0.36" | — |
| 2002 | 60° | 46° | 53° | — | — |
| 2001 | 59° | 43° | 51° | — | — |
| 2000 | 60° | 51° | 56° | — | — |
| 1999 | 58° | 48° | 53° | — | — |
| 1998 | 84° | 50° | 67° | — | — |
| 1997 | 65° | 54° | 59° | — | — |
| 1996 | 65° | 50° | 57° | — | — |
| 1995 | 69° | 46° | 58° | — | — |
| 1994 | 64° | 52° | 58° | — | — |
| 1993 | 67° | 54° | 60° | — | — |
| 1992 | 65° | 52° | 58° | — | — |
| 1991 | 66° | 51° | 59° | 0.43" | — |
| 1990 | 60° | 51° | 56° | — | — |
| 1989 | 63° | 52° | 57° | 0.23" | — |
| 1988 | 62° | 49° | 55° | — | — |
| 1987 | 90° | 55° | 72° | — | — |
| 1986 | 75° | 53° | 64° | — | — |
| 1985 | 60° | 50° | 55° | 0.33" | — |
| 1984 | 68° | 47° | 57° | — | — |
| 1983 | 60° | 52° | 56° | — | — |
| 1982 | 78° | 63° | 70° | — | — |
| 1981 | 63° | 50° | 56° | — | — |
| 1980 | 54° | 48° | 51° | 0.03" | — |
| 1979 | 64° | 50° | 57° | 0.25" | — |
| 1978 | 59° | 49° | 54° | — | — |
| 1977 | 60° | 44° | 52° | — | — |
| 1976 | 57° | 47° | 52° | — | — |
| 1975 | 54° | 48° | 51° | — | — |
| 1974 | 54° | 48° | 51° | — | — |
| 1973 | 71° | 56° | 63° | — | — |
| 1972 | 62° | 47° | 54° | — | — |
| 1971coldest | 53° | 43° | 48° | — | — |
55 years of data from SAN FRANCISCO DWTN