Weather on December 9
San Marcos, CA
55 Years of Data
About This Date
December 9th in San Marcos, CA typically brings pleasant winter weather, with average highs around 70°F and lows near 43°F — a 27°F daily swing. Over 55 years of records, the warmest December 9th was in 1988 (68°F average), while the coldest was 1971 (43°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 13% of December 9th dates historically, with the wettest December 9th recording 1.5" of rain. The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.4°F warmer on this date compared to 20-30 years ago.
Planning for December 9th in San Marcos, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 47° | 66° | — | — |
| 2024 | 70° | 47° | 58° | — | — |
| 2023 | 74° | 43° | 58° | — | — |
| 2022 | 64° | 39° | 52° | — | — |
| 2021 | 60° | 52° | 56° | 0.28" | — |
| 2020 | 75° | 48° | 62° | — | — |
| 2019 | 65° | 48° | 56° | 0.23" | — |
| 2018 | 74° | 45° | 59° | — | — |
| 2017 | 83° | 46° | 64° | — | — |
| 2016 | 66° | 46° | 56° | — | — |
| 2015 | 79° | 48° | 63° | — | — |
| 2014 | 80° | 54° | 67° | — | — |
| 2013 | 60° | 35° | 48° | — | — |
| 2012 | 68° | 44° | 56° | — | — |
| 2011 | 70° | 37° | 53° | — | — |
| 2010 | 72° | 43° | 57° | — | — |
| 2009 | 56° | 44° | 50° | — | — |
| 2008 | 74° | 49° | 61° | — | — |
| 2007 | 63° | 43° | 53° | — | — |
| 2006 | 64° | 49° | 56° | 1.5" | — |
| 2005 | 75° | 40° | 57° | — | — |
| 2004 | 67° | 45° | 56° | — | — |
| 2003 | 72° | 38° | 55° | — | — |
| 2002 | 68° | 46° | 57° | — | — |
| 2001 | 75° | 37° | 56° | — | — |
| 2000 | 64° | 54° | 59° | — | — |
| 1999 | 70° | 37° | 53° | — | — |
| 1998 | 67° | 35° | 51° | — | — |
| 1997 | 66° | 38° | 52° | — | — |
| 1996 | 68° | 46° | 57° | 0.18" | — |
| 1995 | 75° | 42° | 59° | — | — |
| 1994 | 68° | 31° | 49° | — | — |
| 1993 | 67° | 42° | 54° | — | — |
| 1992 | 64° | 38° | 51° | — | — |
| 1991 | 69° | 51° | 60° | 0.25" | — |
| 1990 | 82° | 40° | 61° | — | — |
| 1989 | 79° | 42° | 60° | — | — |
| 1988warmest | 76° | 61° | 68° | — | — |
| 1987 | 72° | 43° | 57° | — | — |
| 1986 | 66° | 39° | 53° | — | — |
| 1985 | 59° | 41° | 50° | — | — |
| 1984 | 69° | 44° | 57° | — | — |
| 1983 | 72° | 43° | 57° | 0.08" | — |
| 1982 | 66° | 60° | 63° | — | — |
| 1981 | 79° | 43° | 61° | — | — |
| 1980 | 66° | 34° | 50° | — | — |
| 1979 | 76° | 41° | 58° | — | — |
| 1978 | 61° | 28° | 44° | — | — |
| 1977 | 68° | 52° | 60° | — | — |
| 1976 | 68° | 34° | 51° | — | — |
| 1975 | 83° | 40° | 61° | — | — |
| 1974 | 69° | 44° | 57° | — | — |
| 1973 | 84° | 39° | 62° | — | — |
| 1972 | 50° | 39° | 45° | 0.38" | — |
| 1971coldest | 59° | 27° | 43° | — | — |
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.