Weather on December 30
San Marcos, CA
55 Years of Data
Avg High
67°F
Avg Low
43°F
Warmest
1990
66°F avg
Coldest
1971
45°F avg
About This Date
December 30th in San Marcos, CA typically brings mild winter weather, with average highs around 67°F and lows near 43°F. Over 55 years of records, the warmest December 30th was in 1990 (66°F average), while the coldest was 1971 (45°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 31% of December 30th dates historically, with the wettest December 30th recording 2.16" of rain. The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
Planning for December 30th in San Marcos, CA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 55° | 66° | — | — |
| 2024 | 70° | 48° | 59° | — | — |
| 2023 | 63° | 55° | 59° | 0.2" | — |
| 2022 | 60° | 53° | 57° | 0.08" | — |
| 2021 | 66° | 50° | 58° | 0.2" | — |
| 2020 | 69° | 37° | 53° | — | — |
| 2019 | 59° | 46° | 53° | — | — |
| 2018 | 65° | 37° | 51° | — | — |
| 2017 | 81° | 43° | 62° | — | — |
| 2016 | 73° | 50° | 62° | 0.51" | — |
| 2015 | 64° | 35° | 50° | — | — |
| 2014 | 57° | 43° | 50° | — | — |
| 2013 | 75° | 38° | 56° | — | — |
| 2012 | 54° | 40° | 47° | 0.51" | — |
| 2011 | 73° | 44° | 59° | — | — |
| 2010 | 54° | 38° | 46° | 0.23" | — |
| 2009 | 59° | 47° | 53° | 0.13" | — |
| 2008 | 66° | 45° | 55° | — | — |
| 2007 | 58° | 42° | 50° | 0.03" | — |
| 2006 | 62° | 42° | 52° | — | — |
| 2005 | 66° | 43° | 54° | — | — |
| 2004 | 62° | 49° | 55° | 0.91" | — |
| 2003 | 63° | 44° | 53° | — | — |
| 2002 | 59° | 45° | 52° | — | — |
| 2001 | 64° | 51° | 58° | 0.03" | — |
| 2000 | 80° | 40° | 60° | — | — |
| 1999 | 71° | 37° | 54° | — | — |
| 1998 | 76° | 41° | 58° | — | — |
| 1997 | 74° | — | — | — | — |
| 1996 | 66° | 51° | 59° | — | — |
| 1995 | 70° | 42° | 56° | — | — |
| 1994 | 60° | 36° | 48° | — | — |
| 1993 | 75° | 40° | 57° | — | — |
| 1992 | 61° | 47° | 54° | 2.16" | — |
| 1991 | 64° | 46° | 55° | 0.66" | — |
| 1990warmest | 69° | 63° | 66° | — | — |
| 1989 | 74° | 36° | 55° | — | — |
| 1988 | 61° | 30° | 45° | — | — |
| 1987 | 56° | 36° | 46° | 0.25" | — |
| 1986 | 76° | 37° | 56° | — | — |
| 1985 | 71° | 50° | 61° | — | — |
| 1984 | 68° | 45° | 56° | — | — |
| 1983 | 77° | 42° | 60° | — | — |
| 1982 | 58° | 33° | 45° | 0.53" | — |
| 1981 | 59° | 47° | 53° | 2.01" | — |
| 1980 | 86° | 40° | 63° | — | — |
| 1979 | 73° | 39° | 56° | — | — |
| 1978 | 65° | 37° | 51° | — | — |
| 1977 | 66° | 55° | 61° | 0.05" | — |
| 1976 | 61° | 42° | 51° | 0.53" | — |
| 1975 | 68° | 37° | 53° | — | — |
| 1974 | 59° | 32° | 46° | — | — |
| 1973 | 67° | 50° | 58° | — | — |
| 1972 | 68° | 29° | 48° | — | — |
| 1971coldest | 61° | 30° | 45° | — | — |
55 years of data from ESCONDIDO #2