Weather on December 9
San Marcos, CA
55 Years of Data
Avg High
70°F
Avg Low
43°F
Warmest
1988
68°F avg
Coldest
1971
43°F avg
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.
Warming Trend
0.8°F per decade on this date
| 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° | — | — |
55 years of data from ESCONDIDO #2