Weather on December 21
San Francisco, CA
55 Years of Data
About This Date
December 21st in San Francisco, CA typically brings cool winter weather, with average highs around 57°F and lows near 47°F. Over 55 years of records, the warmest December 21st was in 1999 (61°F average), while the coldest was 1990 (36°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 47% of December 21st dates historically, with the wettest December 21st recording 4.75" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for December 21st in San Francisco, CA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 63° | 58° | 60° | 0.64" | — |
| 2024 | 57° | 49° | 53° | 0.48" | — |
| 2023 | 62° | 53° | 58° | — | — |
| 2022 | 56° | 45° | 50° | — | — |
| 2021 | 53° | 44° | 49° | 0.41" | — |
| 2020 | 58° | 46° | 52° | — | — |
| 2019 | 61° | 50° | 55° | — | — |
| 2018 | 58° | 53° | 55° | 0.23" | — |
| 2017 | 56° | 46° | 51° | — | — |
| 2016 | 63° | 48° | 55° | — | — |
| 2015 | 58° | 50° | 54° | 3.3" | — |
| 2014 | 62° | 57° | 60° | 0.15" | — |
| 2013 | 58° | 45° | 51° | — | — |
| 2012 | 55° | 51° | 53° | 0.58" | — |
| 2011 | 59° | 44° | 52° | — | — |
| 2010 | 58° | 48° | 53° | 0.28" | — |
| 2009 | 58° | 49° | 53° | 0.41" | — |
| 2008 | 53° | 45° | 49° | 1.45" | — |
| 2007 | 54° | 43° | 48° | — | — |
| 2006 | 51° | 46° | 49° | 1.7" | — |
| 2005 | 67° | 55° | 61° | 1.8" | — |
| 2004 | 69° | 43° | 56° | — | — |
| 2003 | 60° | 50° | 55° | — | — |
| 2002 | 57° | 48° | 53° | 0.28" | — |
| 2001 | 57° | 46° | 52° | 0.05" | — |
| 2000 | 57° | 49° | 53° | 0.08" | — |
| 1999warmest | 70° | 53° | 61° | — | — |
| 1998 | 46° | 34° | 40° | — | — |
| 1997 | 59° | 46° | 53° | — | — |
| 1996 | 54° | 50° | 52° | 4.75" | — |
| 1995 | 57° | 45° | 51° | — | — |
| 1994 | 55° | 43° | 49° | — | — |
| 1993 | 50° | 37° | 44° | — | — |
| 1992 | 57° | 47° | 52° | — | — |
| 1991 | 58° | 43° | 50° | — | — |
| 1990coldest | 42° | 30° | 36° | — | — |
| 1989 | 56° | 42° | 49° | — | — |
| 1988 | 54° | 42° | 48° | 0.38" | — |
| 1987 | 54° | 46° | 50° | 0.13" | — |
| 1986 | 55° | 45° | 50° | — | — |
| 1985 | 54° | 41° | 47° | — | — |
| 1984 | 56° | 43° | 49° | — | — |
| 1983 | 50° | 44° | 47° | 0.05" | — |
| 1982 | 57° | 50° | 54° | 2.06" | — |
| 1981 | 61° | 53° | 57° | 0.08" | — |
| 1980 | 57° | 51° | 54° | 2.01" | — |
| 1979 | 57° | 50° | 54° | — | — |
| 1978 | 56° | 43° | 49° | — | — |
| 1977 | 62° | 52° | 57° | — | — |
| 1976 | 58° | 47° | 52° | — | — |
| 1975 | 56° | 45° | 50° | 0.33" | — |
| 1974 | 55° | 44° | 50° | 0.05" | — |
| 1973 | 60° | 49° | 54° | 1.4" | — |
| 1972 | 57° | 51° | 54° | — | — |
| 1971 | 52° | 42° | 47° | 0.51" | — |
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.