Weather on April 21
Costa Mesa, CA
55 Years of Data
Avg High
73°F
Avg Low
54°F
Warmest
1982
77°F avg
Coldest
1971
55°F avg
About This Date
April 21st in Costa Mesa, CA typically brings pleasant spring weather, with average highs around 73°F and lows near 54°F. Over 55 years of records, the warmest April 21st was in 1982 (77°F average), while the coldest was 1971 (55°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 7% of April 21st dates historically. The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
Planning for April 21st in Costa Mesa, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 68° | 56° | 62° | — | — |
| 2024 | 72° | — | — | — | — |
| 2023 | 86° | 58° | 72° | — | — |
| 2022 | 69° | 55° | 62° | — | — |
| 2021 | 68° | 57° | 63° | — | — |
| 2020 | 72° | 61° | 66° | — | — |
| 2019 | 68° | 56° | 62° | — | — |
| 2018 | 80° | 53° | 67° | — | — |
| 2017 | 82° | 58° | 70° | — | — |
| 2016 | 77° | 57° | 67° | — | — |
| 2015 | 66° | 58° | 62° | — | — |
| 2014 | 75° | 60° | 68° | — | — |
| 2013 | 72° | 56° | 64° | — | — |
| 2012 | 70° | 59° | 64° | — | — |
| 2011 | 69° | 58° | 63° | — | — |
| 2010 | 60° | 52° | 56° | 0.03" | — |
| 2009 | 88° | 63° | 75° | — | — |
| 2008 | 66° | 49° | 57° | — | — |
| 2007 | 64° | 49° | 56° | — | — |
| 2006 | 68° | 58° | 63° | — | — |
| 2005 | 73° | 51° | 62° | — | — |
| 2004 | 67° | 57° | 62° | — | — |
| 2003 | 65° | 55° | 60° | — | — |
| 2002 | 72° | 50° | 61° | — | — |
| 2001 | 61° | 51° | 56° | 0.28" | — |
| 2000 | 67° | 55° | 61° | — | — |
| 1999 | 67° | 57° | 62° | — | — |
| 1998 | 86° | 56° | 71° | — | — |
| 1997 | 77° | 52° | 64° | — | — |
| 1996 | 71° | 51° | 61° | — | — |
| 1995 | 70° | 45° | 57° | — | — |
| 1994 | 67° | 58° | 62° | — | — |
| 1993 | 86° | 56° | 71° | — | — |
| 1992 | 79° | 57° | 68° | — | — |
| 1991 | 67° | 55° | 61° | — | — |
| 1990 | 73° | 58° | 65° | — | — |
| 1989 | 75° | 60° | 68° | — | — |
| 1988 | 65° | 51° | 58° | 0.1" | — |
| 1987 | 93° | 50° | 72° | — | — |
| 1986 | 87° | 57° | 72° | — | — |
| 1985 | 60° | 50° | 55° | — | — |
| 1984 | 82° | 49° | 65° | — | — |
| 1983 | 68° | 53° | 61° | 0.15" | — |
| 1982warmest | 85° | 70° | 77° | — | — |
| 1981 | 74° | 51° | 62° | — | — |
| 1980 | 74° | 54° | 64° | — | — |
| 1979 | 77° | 49° | 63° | — | — |
| 1978 | 70° | 55° | 62° | — | — |
| 1977 | 81° | 52° | 66° | — | — |
| 1976 | 82° | 52° | 67° | — | — |
| 1975 | 70° | 51° | 60° | — | — |
| 1974 | 78° | 50° | 64° | — | — |
| 1973 | 76° | 45° | 60° | — | — |
| 1972 | 78° | 46° | 62° | — | — |
| 1971coldest | 63° | 47° | 55° | — | — |
55 years of data from SANTA ANA JOHN WAYNE AP