Weather on March 21
San Marcos, CA
55 Years of Data
Avg High
71°F
Avg Low
48°F
Warmest
2026
69°F avg
Coldest
1973
49°F avg
About This Date
March 21st in San Marcos, CA typically brings pleasant spring weather, with average highs around 71°F and lows near 48°F. Over 56 years of records, the warmest March 21st was in 2026 (69°F average), while the coldest was 1973 (49°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 21% of March 21st dates historically, with the wettest March 21st recording 3.84" 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 March 21st in San Marcos, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 77° | 60° | 69° | — | — |
| 2025 | 81° | 47° | 64° | — | — |
| 2024 | 76° | 54° | 65° | — | — |
| 2023 | 62° | 51° | 57° | 3.76" | — |
| 2022 | 75° | 47° | 61° | — | — |
| 2021 | 67° | 44° | 55° | — | — |
| 2020 | 65° | 50° | 57° | — | — |
| 2019 | 62° | 51° | 57° | 0.3" | — |
| 2018 | 79° | 51° | 65° | — | — |
| 2017 | 74° | 53° | 63° | — | — |
| 2016 | 71° | 54° | 62° | — | — |
| 2015 | 79° | 54° | 66° | — | — |
| 2014 | 69° | 57° | 63° | — | — |
| 2013 | 71° | 52° | 61° | — | — |
| 2012 | 76° | 44° | 60° | — | — |
| 2011 | 60° | 44° | 52° | 3.84" | — |
| 2010 | 70° | 49° | 59° | — | — |
| 2009 | 61° | 54° | 57° | — | — |
| 2008 | 67° | 48° | 57° | 0.03" | — |
| 2007 | 58° | 51° | 54° | — | — |
| 2006 | 56° | 48° | 52° | 0.48" | — |
| 2005 | 68° | 50° | 59° | — | — |
| 2004 | 63° | 54° | 58° | — | — |
| 2003 | 73° | 41° | 57° | — | — |
| 2002 | 82° | 44° | 63° | — | — |
| 2001 | 75° | 50° | 63° | — | — |
| 2000 | 71° | 41° | 56° | — | — |
| 1999 | 68° | 40° | 54° | — | — |
| 1998 | 71° | 53° | 62° | — | — |
| 1997 | 87° | 48° | 68° | — | — |
| 1996 | 78° | 50° | 64° | — | — |
| 1995 | 65° | 51° | 58° | 1.7" | — |
| 1994 | 69° | 51° | 60° | — | — |
| 1993 | 74° | 57° | 65° | — | — |
| 1992 | 63° | 53° | 58° | 1.52" | — |
| 1991 | 58° | 41° | 49° | 2.16" | — |
| 1990 | 84° | 52° | 68° | — | — |
| 1989 | 84° | 46° | 65° | — | — |
| 1988 | 82° | 46° | 64° | — | — |
| 1987 | 62° | 45° | 53° | 1.52" | — |
| 1986 | 85° | 46° | 65° | — | — |
| 1985 | 65° | 43° | 54° | — | — |
| 1984 | 79° | 46° | 62° | — | — |
| 1983 | 61° | 57° | 59° | 1.37" | — |
| 1982 | 70° | 36° | 53° | — | — |
| 1981 | 65° | 41° | 53° | — | — |
| 1980 | 69° | 46° | 58° | — | — |
| 1979 | 58° | 45° | 51° | 0.05" | — |
| 1978 | 66° | 56° | 61° | — | — |
| 1977 | 80° | 41° | 61° | — | — |
| 1976 | 84° | 40° | 62° | — | — |
| 1975 | 62° | 46° | 54° | — | — |
| 1974 | 67° | 48° | 57° | — | — |
| 1973coldest | 58° | 40° | 49° | 0.33" | — |
| 1972 | 76° | 50° | 63° | — | — |
| 1971 | 70° | 47° | 58° | — | — |
56 years of data from ESCONDIDO #2