Weather on May 20
Costa Mesa, CA
55 Years of Data
Avg High
73°F
Avg Low
58°F
Warmest
1983
74°F avg
Coldest
1975
57°F avg
About This Date
May 20th in Costa Mesa, CA typically brings pleasant spring weather, with average highs around 73°F and lows near 58°F. Over 55 years of records, the warmest May 20th was in 1983 (74°F average), while the coldest was 1975 (57°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 4% of May 20th 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 20th in Costa Mesa, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 61° | 72° | — | — |
| 2024 | 69° | 59° | 64° | — | — |
| 2023 | 71° | 62° | 67° | — | — |
| 2022 | 69° | 60° | 65° | 0.1" | — |
| 2021 | 73° | 60° | 67° | — | — |
| 2020 | 74° | 59° | 66° | — | — |
| 2019 | 67° | 57° | 62° | — | — |
| 2018 | 68° | 60° | 64° | — | — |
| 2017 | 88° | 61° | 74° | — | — |
| 2016 | 68° | 58° | 63° | — | — |
| 2015 | 69° | 58° | 63° | — | — |
| 2014 | 70° | 62° | 66° | — | — |
| 2013 | 76° | 60° | 68° | — | — |
| 2012 | 76° | 62° | 69° | — | — |
| 2011 | 70° | 57° | 63° | — | — |
| 2010 | 74° | 58° | 66° | — | — |
| 2009 | 77° | 61° | 69° | — | — |
| 2008 | 70° | 62° | 66° | — | — |
| 2007 | 67° | 59° | 63° | — | — |
| 2006 | 73° | 62° | 68° | — | — |
| 2005 | 82° | 62° | 72° | — | — |
| 2004 | 70° | 61° | 65° | — | — |
| 2003 | 77° | 55° | 66° | — | — |
| 2002 | 67° | 56° | 61° | — | — |
| 2001 | 72° | 61° | 66° | — | — |
| 2000 | 77° | 58° | 67° | — | — |
| 1999 | 67° | 59° | 63° | — | — |
| 1998 | 71° | 55° | 63° | — | — |
| 1997 | 77° | 63° | 70° | — | — |
| 1996 | 75° | 58° | 66° | — | — |
| 1995 | 69° | 56° | 62° | — | — |
| 1994 | 74° | 51° | 62° | — | — |
| 1993 | 75° | 62° | 69° | — | — |
| 1992 | 74° | 61° | 67° | — | — |
| 1991 | 69° | 50° | 60° | — | — |
| 1990 | 73° | 54° | 63° | — | — |
| 1989 | 80° | 56° | 68° | — | — |
| 1988 | 85° | 61° | 73° | — | — |
| 1987 | 66° | 59° | 63° | — | — |
| 1986 | 74° | 59° | 66° | — | — |
| 1985 | 72° | 59° | 65° | — | — |
| 1984 | 78° | 57° | 68° | — | — |
| 1983warmest | 86° | 63° | 74° | — | — |
| 1982 | 74° | 58° | 66° | — | — |
| 1981 | 69° | 54° | 61° | — | — |
| 1980 | 70° | 58° | 64° | — | — |
| 1979 | 69° | 56° | 62° | — | — |
| 1978 | 85° | 59° | 72° | — | — |
| 1977 | 78° | 55° | 67° | — | — |
| 1976 | 70° | 60° | 65° | — | — |
| 1975coldest | 63° | 52° | 57° | 0.25" | — |
| 1974 | 74° | 49° | 61° | — | — |
| 1973 | 70° | 57° | 63° | — | — |
| 1972 | 69° | 48° | 59° | — | — |
| 1971 | 79° | 55° | 67° | — | — |
55 years of data from SANTA ANA JOHN WAYNE AP