Weather on April 21
San Francisco, CA
55 Years of Data
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 56 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 23% of April 21st dates historically, with the wettest April 21st recording 0.69" of rain. 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 April 21st in San Francisco, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 61° | 52° | 56° | 0.69" | — |
| 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° | — | — |
San Francisco, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
San Francisco, CA Monthly Precipitation
Average rainfall per month, in inches.
San Francisco, 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 San Francisco, CA
Most pleasant months in San Francisco, CA: July, August.