Weather on March 21
Costa Mesa, CA
55 Years of Data
Avg High
70°F
Avg Low
52°F
Warmest
1986
70°F avg
Coldest
1991
51°F avg
About This Date
March 21st in Costa Mesa, CA typically brings pleasant spring weather, with average highs around 70°F and lows near 52°F. Over 56 years of records, the warmest March 21st was in 1986 (70°F average), while the coldest was 1991 (51°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 25% of March 21st dates historically, with the wettest March 21st recording 2.59" 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 Costa Mesa, CA? Great weather for outdoor activities.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 79° | 60° | 69° | — | — |
| 2025 | 73° | 51° | 62° | — | — |
| 2024 | 69° | 57° | 63° | — | — |
| 2023 | 63° | 51° | 57° | 2.59" | — |
| 2022 | 70° | 55° | 62° | — | — |
| 2021 | 65° | 51° | 58° | — | — |
| 2020 | 69° | 55° | 62° | — | — |
| 2019 | 62° | 53° | 58° | 0.28" | — |
| 2018 | 74° | 55° | 64° | — | — |
| 2017 | 67° | 55° | 61° | 0.03" | — |
| 2016 | 68° | 57° | 63° | — | — |
| 2015 | 70° | 60° | 65° | — | — |
| 2014 | 67° | 58° | 62° | — | — |
| 2013 | 68° | 54° | 61° | — | — |
| 2012 | 75° | 49° | 62° | — | — |
| 2011 | 59° | 47° | 53° | 0.61" | — |
| 2010 | 75° | 53° | 64° | — | — |
| 2009 | 61° | 55° | 58° | — | — |
| 2008 | 76° | 50° | 63° | 0.03" | — |
| 2007 | 63° | 55° | 59° | 0.03" | — |
| 2006 | 59° | 50° | 55° | 0.05" | — |
| 2005 | 67° | 51° | 59° | — | — |
| 2004 | 68° | 56° | 62° | — | — |
| 2003 | 68° | 50° | 59° | — | — |
| 2002 | 75° | 50° | 63° | — | — |
| 2001 | 64° | 55° | 60° | — | — |
| 2000 | 71° | 54° | 62° | — | — |
| 1999 | 64° | 49° | 56° | — | — |
| 1998 | 70° | 55° | 62° | — | — |
| 1997 | 84° | 50° | 67° | — | — |
| 1996 | 66° | 57° | 62° | — | — |
| 1995 | 66° | 60° | 63° | 1.4" | — |
| 1994 | 71° | 52° | 61° | — | — |
| 1993 | 74° | 57° | 65° | — | — |
| 1992 | 65° | 54° | 59° | 1.68" | — |
| 1991coldest | 58° | 44° | 51° | 0.03" | — |
| 1990 | 87° | 52° | 69° | — | — |
| 1989 | 85° | 54° | 69° | — | — |
| 1988 | 81° | 51° | 66° | — | — |
| 1987 | 64° | 46° | 55° | 0.81" | — |
| 1986warmest | 89° | 52° | 70° | — | — |
| 1985 | 70° | 49° | 59° | — | — |
| 1984 | 78° | 52° | 65° | — | — |
| 1983 | 63° | 50° | 56° | 1.75" | — |
| 1982 | 71° | 44° | 58° | — | — |
| 1981 | 66° | 47° | 56° | — | — |
| 1980 | 68° | 52° | 60° | — | — |
| 1979 | 61° | 48° | 54° | 0.25" | — |
| 1978 | 70° | 59° | 64° | 0.05" | — |
| 1977 | 79° | 46° | 62° | — | — |
| 1976 | 82° | 47° | 64° | — | — |
| 1975 | 64° | 49° | 56° | — | — |
| 1974 | 69° | 50° | 60° | — | — |
| 1973 | 59° | 44° | 52° | — | — |
| 1972 | 74° | 54° | 64° | — | — |
| 1971 | 63° | 50° | 56° | — | — |
56 years of data from SANTA ANA JOHN WAYNE AP