Weather on May 21
San Marcos, CA
55 Years of Data
Avg High
76°F
Avg Low
56°F
Warmest
2005
77°F avg
Coldest
1972
56°F avg
About This Date
May 21st in San Marcos, CA typically brings pleasant spring weather, with average highs around 76°F and lows near 56°F. Over 55 years of records, the warmest May 21st was in 2005 (77°F average), while the coldest was 1972 (56°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 4% of May 21st dates historically. 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 May 21st in San Marcos, CA? Great weather for outdoor activities.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 92° | 58° | 75° | — | — |
| 2024 | 75° | 57° | 66° | — | — |
| 2023 | 81° | 60° | 70° | — | — |
| 2022 | 66° | 59° | 63° | — | — |
| 2021 | 69° | 55° | 62° | — | — |
| 2020 | 83° | 54° | 68° | — | — |
| 2019 | 66° | 54° | 60° | — | — |
| 2018 | 69° | 57° | 63° | 0.08" | — |
| 2017 | 92° | 58° | 75° | — | — |
| 2016 | 71° | 56° | 63° | — | — |
| 2015 | 68° | 58° | 63° | — | — |
| 2014 | 74° | 56° | 65° | — | — |
| 2013 | 85° | 61° | 73° | — | — |
| 2012 | 85° | 57° | 71° | — | — |
| 2011 | 78° | 57° | 68° | — | — |
| 2010 | 65° | 57° | 61° | — | — |
| 2009 | 67° | 59° | 63° | — | — |
| 2008 | 66° | 57° | 62° | — | — |
| 2007 | 69° | 59° | 64° | — | — |
| 2006 | 68° | 61° | 64° | — | — |
| 2005warmest | 95° | 59° | 77° | — | — |
| 2004 | 64° | 60° | 62° | — | — |
| 2003 | 74° | 58° | 66° | — | — |
| 2002 | 68° | 48° | 58° | 0.25" | — |
| 2001 | 75° | 58° | 66° | — | — |
| 2000 | 90° | 58° | 74° | — | — |
| 1999 | 70° | 56° | 63° | — | — |
| 1998 | 72° | 55° | 63° | — | — |
| 1997 | 82° | 62° | 72° | — | — |
| 1996 | 79° | 56° | 67° | — | — |
| 1995 | 70° | 55° | 62° | — | — |
| 1994 | 77° | 46° | 62° | — | — |
| 1993 | 79° | 60° | 69° | — | — |
| 1992 | 77° | 75° | 76° | — | — |
| 1991 | 66° | 53° | 60° | — | — |
| 1990 | 78° | 54° | 66° | — | — |
| 1989 | 84° | 52° | 68° | — | — |
| 1988 | 88° | 57° | 72° | — | — |
| 1987 | 69° | 54° | 61° | — | — |
| 1986 | 75° | 57° | 66° | — | — |
| 1985 | 77° | 59° | 68° | — | — |
| 1984 | 76° | 58° | 67° | — | — |
| 1983 | 82° | 58° | 70° | — | — |
| 1982 | 75° | 59° | 67° | — | — |
| 1981 | 77° | 45° | 61° | — | — |
| 1980 | 68° | 55° | 62° | — | — |
| 1979 | 73° | 56° | 64° | — | — |
| 1978 | 77° | 58° | 67° | — | — |
| 1977 | 81° | 48° | 64° | — | — |
| 1976 | 76° | 53° | 64° | — | — |
| 1975 | 68° | 44° | 56° | — | — |
| 1974 | 83° | 45° | 64° | — | — |
| 1973 | 74° | 56° | 65° | — | — |
| 1972coldest | 70° | 43° | 56° | — | — |
| 1971 | 76° | 52° | 64° | — | — |
55 years of data from ESCONDIDO #2