Weather on December 20
San Marcos, CA
55 Years of Data
About This Date
December 20th in San Marcos, CA typically brings mild winter weather, with average highs around 69°F and lows near 42°F — a 27°F daily swing. Over 55 years of records, the warmest December 20th was in 1991 (68°F average), while the coldest was 1992 (44°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 18% of December 20th dates historically, with the wettest December 20th recording 3.15" 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 20th in San Marcos, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 70° | 49° | 59° | — | — |
| 2024 | 79° | 45° | 62° | — | — |
| 2023 | 74° | 55° | 64° | — | — |
| 2022 | 69° | 39° | 54° | — | — |
| 2021 | 70° | 37° | 53° | — | — |
| 2020 | 82° | 41° | 62° | — | — |
| 2019 | 77° | 42° | 60° | — | — |
| 2018 | 78° | 44° | 61° | — | — |
| 2017 | 65° | 40° | 52° | — | — |
| 2016 | 78° | 42° | 60° | — | — |
| 2015 | 61° | 47° | 54° | 0.33" | — |
| 2014 | 65° | 46° | 55° | — | — |
| 2013 | 62° | 39° | 51° | — | — |
| 2012 | 71° | 34° | 52° | — | — |
| 2011 | 64° | 46° | 55° | — | — |
| 2010 | 61° | 57° | 59° | 3.15" | — |
| 2009 | 71° | 51° | 61° | — | — |
| 2008 | 58° | 40° | 49° | — | — |
| 2007 | 60° | 53° | 57° | 0.1" | — |
| 2006 | 61° | 32° | 46° | — | — |
| 2005 | 81° | 45° | 63° | — | — |
| 2004 | 77° | 41° | 59° | — | — |
| 2003 | 68° | 45° | 56° | — | — |
| 2002 | 56° | 43° | 49° | 2.21" | — |
| 2001 | 76° | 36° | 56° | — | — |
| 2000 | 75° | 40° | 57° | — | — |
| 1999 | 81° | 42° | 61° | — | — |
| 1998 | 81° | 44° | 62° | 0.76" | — |
| 1997 | 79° | 58° | 68° | — | — |
| 1996 | 73° | 36° | 54° | — | — |
| 1995 | 63° | 44° | 53° | — | — |
| 1994 | 78° | 39° | 59° | — | — |
| 1993 | 67° | 41° | 54° | — | — |
| 1992coldest | 59° | 29° | 44° | — | — |
| 1991warmest | 70° | 67° | 68° | — | — |
| 1990 | 53° | 44° | 49° | 0.71" | — |
| 1989 | 69° | 39° | 54° | — | — |
| 1988 | 65° | 43° | 54° | — | — |
| 1987 | 67° | 38° | 52° | 1.73" | — |
| 1986 | 65° | 42° | 53° | 0.38" | — |
| 1985 | 78° | 41° | 60° | — | — |
| 1984 | 60° | 31° | 45° | 1.93" | — |
| 1983 | 68° | 47° | 57° | — | — |
| 1982 | 76° | 38° | 57° | — | — |
| 1981 | 69° | 42° | 56° | — | — |
| 1980 | 75° | 40° | 57° | — | — |
| 1979 | 68° | 38° | 53° | — | — |
| 1978 | 60° | 31° | 45° | — | — |
| 1977 | 67° | 49° | 58° | — | — |
| 1976 | 70° | 41° | 55° | — | — |
| 1975 | 58° | 34° | 46° | 0.25" | — |
| 1974 | 75° | 37° | 56° | — | — |
| 1973 | 76° | 37° | 56° | — | — |
| 1972 | 78° | 42° | 60° | — | — |
| 1971 | 62° | 33° | 48° | — | — |
San Marcos, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
San Marcos, CA Monthly Precipitation
Average rainfall per month, in inches.
San Marcos, 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 Marcos, CA
Most pleasant months in San Marcos, CA: June.