Weather on August 9
Costa Mesa, CA
55 Years of Data
Avg High
82°F
Avg Low
65°F
Warmest
2018
82°F avg
Coldest
1999
67°F avg
About This Date
August 9th in Costa Mesa, CA typically brings warm summer weather, with average highs around 82°F and lows near 65°F. Over 55 years of records, the warmest August 9th was in 2018 (82°F average), while the coldest was 1999 (67°F) — a 15°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 9th dates historically. The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for August 9th in Costa Mesa, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 66° | 72° | — | — |
| 2024 | 81° | 68° | 74° | — | — |
| 2023 | 79° | 69° | 74° | — | — |
| 2022 | 89° | 73° | 81° | — | — |
| 2021 | 83° | 68° | 75° | — | — |
| 2020 | 77° | 64° | 71° | — | — |
| 2019 | 79° | 64° | 71° | — | — |
| 2018warmest | 91° | 73° | 82° | — | — |
| 2017 | 80° | 66° | 73° | — | — |
| 2016 | 76° | 66° | 71° | — | — |
| 2015 | 76° | 65° | 70° | — | — |
| 2014 | 81° | 71° | 76° | — | — |
| 2013 | 76° | 65° | 70° | — | — |
| 2012 | 86° | 69° | 78° | — | — |
| 2011 | 77° | 64° | 71° | — | — |
| 2010 | 75° | 63° | 69° | — | — |
| 2009 | 77° | 64° | 71° | — | — |
| 2008 | 83° | 67° | 75° | — | — |
| 2007 | 78° | 65° | 71° | — | — |
| 2006 | 87° | 68° | 78° | — | — |
| 2005 | 81° | 66° | 73° | — | — |
| 2004 | 81° | 65° | 73° | — | — |
| 2003 | 90° | 67° | 78° | — | — |
| 2002 | 80° | 63° | 71° | — | — |
| 2001 | 77° | 64° | 71° | — | — |
| 2000 | 82° | 65° | 73° | — | — |
| 1999coldest | 73° | 60° | 67° | — | — |
| 1998 | 97° | 65° | 81° | — | — |
| 1997 | 80° | 66° | 73° | — | — |
| 1996 | 83° | 65° | 74° | — | — |
| 1995 | 85° | 65° | 75° | — | — |
| 1994 | 90° | 66° | 78° | — | — |
| 1993 | 83° | 67° | 75° | — | — |
| 1992 | 89° | 68° | 79° | — | — |
| 1991 | 82° | 61° | 71° | — | — |
| 1990 | 84° | 67° | 75° | — | — |
| 1989 | 82° | 65° | 73° | — | — |
| 1988 | 78° | 62° | 70° | — | — |
| 1987 | 82° | 63° | 72° | — | — |
| 1986 | 82° | 62° | 72° | — | — |
| 1985 | 80° | 62° | 71° | — | — |
| 1984 | 81° | 64° | 72° | — | — |
| 1983 | 92° | 70° | 81° | 0.08" | — |
| 1982 | 87° | 64° | 76° | — | — |
| 1981 | 84° | 63° | 73° | — | — |
| 1980 | 90° | 66° | 78° | — | — |
| 1979 | 87° | 65° | 76° | — | — |
| 1978 | 81° | 67° | 74° | — | — |
| 1977 | 82° | 64° | 73° | — | — |
| 1976 | 79° | 61° | 70° | — | — |
| 1975 | 80° | 63° | 71° | — | — |
| 1974 | 80° | 65° | 72° | — | — |
| 1973 | 81° | 61° | 71° | — | — |
| 1972 | 78° | 66° | 72° | — | — |
| 1971 | 93° | 70° | 81° | — | — |
55 years of data from SANTA ANA JOHN WAYNE AP